CN117074860A

CN117074860A - Power system fault analysis method, device, equipment and storage medium

Info

Publication number: CN117074860A
Application number: CN202311064766.1A
Authority: CN
Inventors: 江清楷; 邱天怡; 周桂; 林雄锋; 陈诗杰; 李梦琪; 黄胄; 尹雁和; 阮志杰; 白一鸣; 何欣欣; 王华佑; 罗志恒; 陈年蔚; 李建斌; 陈锐; 舒昶
Original assignee: Guangdong Power Grid Co Ltd; Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2023-11-17

Abstract

The invention discloses a power system fault analysis method, a device, equipment and a storage medium, which are used for analyzing the cause of the power system fault. The invention comprises the following steps: determining the initial action type of the fault through the line included angle and the protection device data; determining a target action type of the fault according to the homologous comparison result of the protection device data and the wave recording data; and constructing a fault analysis report by combining the interval data. The line data, the protection device data and the recording data are used for analyzing and judging the fault reason of the power system in combination with the preset action type, so that the efficiency of power system fault analysis is improved, the situation that partial data sources possibly have abnormality is considered, and the accuracy of power system fault analysis is improved.

Description

Power system fault analysis method, device, equipment and storage medium

Technical Field

The present invention relates to the field of power system fault analysis technologies, and in particular, to a power system fault analysis method, apparatus, device, and storage medium.

Background

With the development of social economy, the scale of the power system in China is continuously enlarged, various conditions affecting the safe and stable operation of the power grid frequently occur, and the fault analysis of the power system is more important for the safe and stable operation of the power system.

When the power system fails, the traditional fault diagnosis is the field diagnosis of the relay protection personnel, and mainly comprises the step of checking action messages, wave recording and equipment conditions on the field. The fault analysis is carried out by the relay protection personnel according to working experience and field conditions, the diagnosis condition and efficiency greatly depend on the level of the relay protection personnel, the fault is often checked for a long time, the risk of occurrence of a judgment error exists, once the fault is manually judged, the power grid can be influenced to recover stable operation in time, the fault range can be further expanded, and great economic loss and bad social influence are caused.

Disclosure of Invention

The invention provides a power system fault analysis method, a device, equipment and a storage medium, which solve the technical problems of low power system fault analysis efficiency and accuracy in the prior art.

The first aspect of the invention provides a power system fault analysis method, which comprises the following steps:

when a fault signal of a power system is received, acquiring a line included angle, protection device data and wave recording data corresponding to the fault signal;

determining an initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval;

Carrying out homologous comparison on the protection device data and the recording data to generate a comparison result;

determining a target action type corresponding to the fault signal according to the comparison result and the initial action type;

when the target action type belongs to a preset first action set, constructing a fault analysis report corresponding to the fault signal by adopting interval data corresponding to the fault signal;

when the target action type belongs to a preset second action set, adopting the false action type corresponding to the interval data to construct a fault analysis report corresponding to the fault signal.

Optionally, when a fault signal of the power system is received, acquiring a line included angle, protection device data and recording data corresponding to the fault signal includes:

when a fault signal of a power system is received, confirming a line interval corresponding to the fault signal by adopting topology data of the power system;

and acquiring the switch on two sides of the line interval and the switch operation mode before the accident, and acquiring the line included angle, the protection device data and the wave recording data on two sides of the line interval when the switch operation mode before the accident is the operation state.

Optionally, the protection device data includes a post-accident switch state and an action occurrence position, and the initial action types include a first initial action type, a second initial action type, a third initial action type and a fourth initial action type; the determining the initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval comprises the following steps:

judging whether the line included angle meets a preset included angle interval or not; the line included angle comprises a line included angle of the side line and a line included angle of the opposite side;

if yes, the line tide direction corresponding to the line included angle is positive;

if not, the line tide direction corresponding to the line included angle is reverse;

when the current direction of the current line corresponding to the current line included angle and the current direction of the opposite line corresponding to the opposite line included angle are both positive directions and the switch state after the accident is in an off state, determining that the initial action type is the first initial action type;

when the current line trend direction and the opposite line trend direction are both positive and the switch state after the accident is not the disconnection state, determining that the initial action type is the second initial action type;

When the current line flow direction is the forward direction, the opposite line flow direction is the reverse direction, and the action occurrence position is the main protection device, determining that the initial action type is the third initial action type;

when the current line flow direction is the forward direction, the opposite line flow direction is the reverse direction, and the action occurrence position is the backup protection device, the initial action type is determined to be the fourth initial action type.

Optionally, the target action types include a first target action type, a second target action type, a third target action type, a fourth target action type, a fifth target action type, a sixth target action type, a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, and the determining, according to the comparison result and the initial action type, the target action type corresponding to the fault signal specifically includes:

if the initial action type is the first initial action type and the homology comparison result meets a first preset comparison condition, determining that the target action type is the first target action type;

If the initial action type is the first initial action type and the homology comparison result meets a second preset comparison condition, determining that the target action type is the second target action type;

if the initial action type is the first initial action type and the homology comparison result meets a third preset comparison condition, determining that the target action type is the third target action type;

if the initial action type is the first initial action type and the homology comparison result meets a fourth preset comparison condition, determining that the target action type is the fourth target action type;

if the initial action type is the second initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the fifth target action type;

if the initial action type is the second initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the sixth target action type;

if the initial action type is the third initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the seventh target action type;

If the initial action type is the third initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the eighth target action type;

if the initial action type is the fourth initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the ninth target action type;

and if the initial action type is the fourth initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the tenth target action type.

Optionally, the second action set includes a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, where the malfunction types include a first malfunction type, a second malfunction type, a third malfunction type, a fourth malfunction type, a fifth malfunction type, a sixth malfunction type, a seventh malfunction type, and an eighth malfunction type; when the target action type belongs to a preset second action set, constructing a fault analysis report corresponding to the fault signal by adopting a false action type corresponding to the interval data, wherein the fault analysis report comprises the following steps:

When the target action type is a seventh target action type, an eighth target action type, a ninth target action type or a tenth target action type, interval data corresponding to the fault signal is acquired;

if the target action type is the seventh target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is a first misoperation type;

if the target action type is the seventh target action type or the eighth target action type and the interval data meets a second preset misoperation condition, determining that the misoperation type is a second misoperation type;

if the target action type is the seventh target action type or the eighth target action type and the interval data meets a third preset misoperation condition, determining that the misoperation type is a third misoperation type;

if the target action type is the eighth target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is a fourth misoperation type;

if the target action type is the ninth target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is a fifth misoperation type;

If the target action type is the ninth target action type or the tenth target action type and the interval data meets a second preset misoperation condition, determining that the misoperation type is a sixth misoperation type;

if the target action type is the ninth target action type or the tenth target action type and the interval data meets a third preset misoperation condition, determining that the misoperation type is a seventh misoperation type;

if the target action type is the tenth target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is an eighth misoperation type;

and constructing a fault analysis report corresponding to the fault signal by adopting the misoperation type and the interval data.

Optionally, the protection device data further includes main protection analog data and main second protection analog data, the recording data includes recording analog data, and the comparison result includes a first analog comparison value, a second analog comparison value and a third analog comparison value; the step of carrying out homologous comparison on the protection device data and the recording data to generate a comparison result comprises the following steps:

performing discrete processing with second as a unit on the main protection simulation data, the main secondary protection simulation data and the wave recording simulation data respectively to generate main one-discrete simulation data, main two-discrete simulation data and wave recording discrete simulation data;

Performing homologous comparison on the main-discrete analog data and the recorded wave discrete analog data to generate a first analog comparison value;

the first analog comparison value is:

wherein Y is ₁ I for the first analog comparison _1t A main protection device current for the t-th time point in the main-discrete analog data, I _t Recording current for the t time point in the discrete recording analog data, u _1t For the main protection device voltage at the t-th point in time in the discrete protection simulation data, U _t The recording voltage at the t-th time point in the discrete recording analog data is recorded, and n is the number of the time points;

performing homologous comparison on the main two discrete analog data and the discrete wave-recording analog data to generate a second analog comparison value;

the second analog comparison is:

wherein Y is ₂ I as the second analog comparison _2t A main two-protection device current for the t-th time point in the main two-discrete analog data, u _2t A primary two-protection device voltage at a t-th point in time in the discrete protection device analog data;

performing homologous comparison on the primary first discrete simulation data and the primary second discrete simulation data to generate a third simulation comparison value;

The third analog comparison value is:

wherein Y is ₃ And the third simulation comparison value.

Optionally, the protection device data further includes main protection state data and main second protection state data, the recording data further includes recording state data, and the comparison result further includes a first state comparison value, a second state comparison value and a third state comparison value; the step of carrying out homologous comparison on the protection device data and the recording data to generate a comparison result, and the step of further comprising:

assigning values to the main protection state data, the main two protection state data and the recording state data respectively, generating main first state quantity data, main second state quantity data and recording waveform state quantity data;

performing homologous comparison on the main state quantity data and the wave recording state quantity data to generate a first state comparison value;

the first state comparison value is:

wherein X is ₁ For the first state comparison value, h _1t A master protection device state quantity H for the t-th time point in the master-state quantity data _t A recording state quantity for the t-th time point in the recording state quantity data;

performing homologous comparison on the main two-state quantity data and the wave recording state quantity data to generate a second state comparison value;

The second state comparison value is:

wherein X is ₂ And h is the second state comparison value _2t A primary second protection device state quantity for a t-th point in time in the primary first state quantity data;

performing homologous comparison on the primary state quantity data and the primary state quantity data to generate a third state comparison value;

the third state comparison value is:

wherein X is ₃ And comparing the third state with the comparison value.

A second aspect of the present invention provides a power system fault analysis system, comprising:

the data acquisition module is used for acquiring a line included angle, protection device data and wave recording data corresponding to a fault signal of the power system when the fault signal is received;

the initial determining module is used for determining an initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval;

the comparison processing module is used for carrying out homologous comparison on the protection device data and the recording data to generate a comparison result;

the target determining module is used for determining a target action type corresponding to the fault signal according to the comparison result and the initial action type;

the first construction module is used for constructing a fault analysis report corresponding to the fault signal by adopting interval data corresponding to the fault signal when the target action type belongs to a preset first action set;

And the second construction module is used for constructing a fault analysis report corresponding to the fault signal by adopting the false operation type corresponding to the interval data when the target action type belongs to a preset second action set.

A third aspect of the present invention provides an electric power system failure analysis apparatus, comprising:

a memory for storing program code and transmitting the program code to the processor;

a processor for executing the power system fault analysis method according to any one of the above according to instructions in the program code.

A fourth aspect of the present invention provides a computer readable storage medium storing program code which when executed by a processor is adapted to carry out the power system fault analysis method of any one of the above.

From the above technical scheme, the invention has the following advantages:

according to the technical scheme disclosed by the invention, the initial action type of the fault is determined through the line included angle and the protection device data, then the target action type of the fault is determined according to the homology comparison result of the protection device data and the wave recording data, finally the fault analysis report is constructed by combining the interval data, wherein the fault cause of the power system is analyzed and judged by combining the line data, the protection device data and the wave recording data with the preset action type, the efficiency of the fault analysis of the power system is improved, the condition that partial data sources possibly have abnormality is considered, and the accuracy of the fault analysis of the power system is improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a flowchart of steps of a power system fault analysis method according to a first embodiment of the present invention;

fig. 2 is a flowchart of a step of a power system fault analysis method according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of a topology structure according to a second embodiment of the present invention;

fig. 4 is a block diagram of a power system fault analysis system according to a third embodiment of the present invention;

fig. 5 is a schematic diagram of data interaction of a secondary intelligent operation and maintenance platform according to a fourth embodiment of the present invention.

Detailed Description

In the existing power system fault analysis theory, fault reasons are only analyzed by using recording data, and the problems of data quality, multi-system interaction and the like can cause adverse effects on basic data of faults or anomalies, so that an analysis conclusion and actual faults or anomalies possibly deviate, and the accuracy of the analysis conclusion is low. The embodiment of the invention provides a power system fault analysis method, a device, equipment and a storage medium, which are used for solving the technical problems of low power system fault analysis efficiency and accuracy in the prior art.

In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a power system fault analysis method according to an embodiment of the invention.

The first embodiment of the invention provides a power system fault analysis method, which comprises the following steps:

step 101, when a fault signal of a power system is received, acquiring a line included angle, protection device data and wave recording data corresponding to the fault signal.

The fault signal is a protection start signal or a current-voltage abrupt signal. The line included angle is the included angle between the bus voltage and the line current and can be obtained from an OCS (Operating Control System, power grid dispatching automation operation control system); the wave recording data are wave recording diagrams and fault wave recording data generated by the wave recorder during the protection action; the protection device data comprise analog data, state data, action messages and alarm signals of each protection device, which are acquired by the recorder in real time; the protection device comprises a main protection device, a backup protection device, a bus protection device and the like; the analog data comprises current, voltage, time, differential current, zero sequence voltage, negative sequence voltage, three-phase voltage and the like; the state data comprises an action phase, an action occurrence position, action time, a switch running mode before and after an accident, a pressing plate state, an opening amount and the like.

Step 102, determining an initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval.

And 103, carrying out homologous comparison on the protection device data and the recording data to generate a comparison result.

And 104, determining a target action type corresponding to the fault signal according to the comparison result and the initial action type.

And 105, when the target action type belongs to a preset first action set, constructing a fault analysis report corresponding to the fault signal by adopting interval data corresponding to the fault signal.

The interval data corresponding to the fault signal refers to data of the power system interval corresponding to the fault signal. The interval data has a plurality of data sources, including: recorder, management unit, protection device and OCS system. The interval data comprises current, voltage, starting value, action value, starting time, action time, protection fixed value, device pressing plate switching condition, alarm signal, differential current, zero sequence voltage, zero sequence current, three-phase voltage and the like.

And 106, when the target action type belongs to a preset second action set, constructing a fault analysis report corresponding to the fault signal by adopting the false action type corresponding to the interval data.

In the first embodiment of the invention, the initial action type of the fault is determined firstly through the line included angle and the protection device data, then the target action type of the fault is determined according to the homology comparison result of the protection device data and the wave recording data, and finally a fault analysis report is constructed by combining interval data, wherein the fault cause of the power system is analyzed and judged by combining the line data, the protection device data and the wave recording data with the preset action type, so that the efficiency of the fault analysis of the power system is improved, the condition that partial data sources possibly have abnormality is considered, and the accuracy of the fault analysis of the power system is improved.

Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a power system fault analysis method according to a second embodiment of the present invention.

The power system fault analysis method provided by the second embodiment of the invention comprises the following steps:

step 201, when a fault signal of a power system is received, determining a line interval corresponding to the fault signal according to topology data of the power system.

It should be noted that, topology data of the power system may be obtained from the OCS system, where the topology data includes information of each protection interval on the bus, information of the opposite side protection interval associated with the information, and a topology structure diagram formed by all stations connected by the lines, and the topology structure diagram is shown in fig. 3, and may be located by the topology information diagram to the line interval that sends the fault signal.

Step 202, acquiring the switch on two sides of the line interval and the switch operation mode before an accident, and acquiring the line included angle, the protection device data and the wave recording data on two sides of the line interval when the switch operation mode before the accident is in an operation state.

It can be understood that the switch operation mode includes an operation state, a hot standby state, a cold standby state, and an overhaul state, wherein if the switch and the knife switch are in the on-position and the ground knife is in the off-position, the switch operation mode is the operation state; if the switch and the ground knife are in the separated position and the knife switch is in the closed position, the switch operation mode is in a hot standby state; if the switch, the disconnecting link and the ground knife are all in the separated position, the operation mode of the switch is a cold standby state; if the switch and the knife switch are in the separated position and the ground knife is in the combined position, the operation mode of the switch is in an overhauling state.

Step 203, determining an initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval.

Optionally, the protection device data includes a post-accident switch state and an action occurrence position, and the initial action types include a first initial action type, a second initial action type, a third initial action type and a fourth initial action type; step 203 comprises the following sub-steps S01-S07:

S01, judging whether the line included angle meets a preset included angle interval or not; the line included angle comprises a side line included angle and an opposite line included angle.

And S02, if so, the line tide direction corresponding to the line included angle is a forward direction.

S03, if not, the line trend direction corresponding to the line included angle is reverse.

Optionally, the preset included angle interval may be set as: the flow direction of the corresponding line is the flow-out bus direction when the line included angle is in the range of [ -90 degrees, 90 degrees ] and the flow direction of the corresponding line is the flow-in bus direction when the line included angle is in the range of (90 degrees, 270 degrees), the flow-out bus direction can be preset to be the forward direction, and the flow-in bus direction is the reverse direction.

S04, determining the initial action type as the first initial action type when the current direction of the current line corresponding to the included angle of the current line and the current direction of the opposite line corresponding to the included angle of the opposite line are both positive directions and the switch state after the accident is an off state.

The switch state after the accident is the on-off state of the switches at the two sides of the protection device after the protection action, wherein if the switches at the two sides of the protection device are all disconnected, the switch state after the accident is the disconnected state; the first initial action type corresponds to the situation that the current direction of the current line of the local side and the current direction of the line on the opposite side are both forward, and the protection action occurrence position is the main protection device, so that the protection action corresponding to the fault signal can be initially determined to have correct action or protection refused action.

And S05, determining the initial action type as the second initial action type when the current direction of the current side line and the current direction of the opposite side line are both positive and the switch state after the accident is not the disconnection state.

It should be noted that, the second initial action type corresponds to the situation that the current direction of the current line of the present side and the current direction of the opposite side line are both forward, and the switch state is not the off state after the accident, it may be determined that the protection action corresponding to the fault signal may have protection refusal or switch refusal; when the current direction of the current line of the side line and the current direction of the opposite line are both forward directions, the accident corresponding to the fault signal can be judged to be the fault in the area, and at the moment, the switches on the two sides of the protection should be correctly tripped, namely the switch state should be the disconnection state after the accident, but if the switches on the two sides of the protection are not correctly tripped, namely the switch state is not the disconnection state after the accident, the situation that the protection is refused or the switch is refused may exist.

S06, when the current line flow direction of the current side is positive, the current line flow direction of the opposite side is reverse, and the action occurrence position is the main protection device, determining that the initial action type is the third initial action type.

In the case of protecting malfunction, it is necessary to further confirm the cause of malfunction by combining specific protection operation occurrence positions, because the protection device includes a main protection device, a backup protection device, and the like in the power system. When the current direction of the current line of the current side is forward, the current direction of the current line of the opposite side is reverse, and the action occurrence position is the main protection device of the current side or the main protection device of the opposite side, the situation of protection misoperation may exist; when the current direction of the current line is forward, the current direction of the opposite line is reverse, and the action occurrence position is the current side backup protection device or the opposite side backup protection device, the protection override trip may occur.

The third initial action type corresponds to the situation that the current direction of the current line is forward, the current direction of the current line of the opposite side is reverse, and the action occurrence position is the main protection device, so that protection misoperation possibly exists in the protection action corresponding to the fault signal can be initially determined.

S07, when the current line flow direction is the forward direction, the opposite line flow direction is the reverse direction, and the action occurrence position is the backup protection device, determining that the initial action type is the fourth initial action type.

It should be noted that, the fourth initial action type corresponds to the current direction of the current line being forward, and the opposite line being reverse, and the action occurrence position being the backup protection device, it may be determined that the protection action corresponding to the fault signal may have a protection malfunction or a protection override trip.

And 204, carrying out homologous comparison on the protection device data and the recording data to generate a comparison result.

Optionally, the protection device data further includes main protection analog data and main second protection analog data, the recording data includes recording analog data, and the comparison result includes a first analog comparison value, a second analog comparison value and a third analog comparison value; step 204 comprises the following sub-steps S10-S13:

s10, performing discrete processing on the main protection simulation data, the main secondary protection simulation data and the wave recording simulation data in a second unit to generate main-discrete simulation data, main secondary discrete simulation data and wave recording discrete simulation data.

It should be noted that, the primary protection analog data includes the current and the voltage of the primary protection device, and the wave recording analog data includes the current and the voltage in the wave recording diagram of the wave recorder.

S11, carrying out homologous comparison on the main-discrete analog data and the wave-recording discrete analog data to generate a first analog comparison value;

the first analog comparison value is:

wherein Y is ₁ I for the first analog comparison _1t For the main one discrete analog dataPrimary protection device current, I at time t _t Recording current for the t time point in the discrete recording analog data, u _1t For the main protection device voltage at the t-th point in time in the discrete protection simulation data, U _t And the recording voltage at the t-th time point in the discrete recording analog data is recorded, and n is the number of the time points.

S12, carrying out homologous comparison on the main two discrete analog data and the discrete wave-recording analog data to generate a second analog comparison value;

the second analog comparison is:

wherein Y is ₂ I as the second analog comparison _2t A main two-protection device current for the t-th time point in the main two-discrete analog data, u _2t And simulating a primary two-protection device voltage at a t-th time point in data for the discrete protection device.

S13, carrying out homologous comparison on the main first discrete analog data and the main second discrete analog data to generate a third analog comparison value;

The third analog comparison value is:

wherein Y is ₃ And the third simulation comparison value.

It can be understood that the closer the first analog comparison value, the second analog comparison value and the third analog comparison value are to 0, the stronger the analog data homology is, which indicates that the more reliable the data source is, if the first analog comparison value, the second analog comparison value and the third analog comparison value are 0, the analog data homology is indicated, and the analog data is accurate; if the data is not 0, the condition that the line protection action is possibly abnormal is indicated, and specific analog data are needed to be found for verification.

Optionally, the protection device data further includes main protection state data and main second protection state data, the recording data further includes recording state data, and the comparison result further includes a first state comparison value, a second state comparison value and a third state comparison value; step 204 further comprises the following substeps S20-S23:

s20, respectively assigning values to the main protection state data, the main protection state data and the recording state data, generating main one-state quantity data, main two-state quantity data and recording waveform state quantity data.

It should be noted that, the main protection state data includes a pressing plate state and an opening amount of the main protection device, and the recording state data includes a pressing plate state and an opening amount in a recording chart of the recorder. When the state and the opening amount of the pressing plate are in the closing position, the corresponding state data is assigned to be 1, otherwise, the corresponding state data is assigned to be 0, and the corresponding state quantity data is generated.

S21, carrying out homologous comparison on the main first state quantity data and the wave recording state quantity data to generate a first state comparison value;

the first state comparison value is:

wherein X is ₁ For the first state comparison value, h _1t A master protection device state quantity H for the t-th time point in the master-state quantity data _t And recording waveform quantity at the t-th time point in the recording waveform quantity data.

S22, carrying out homologous comparison on the main two-state quantity data and the wave recording state quantity data to generate a second state comparison value;

the second state comparison value is:

wherein X is ₂ And h is the second state comparison value _2t And the state quantity of the main two protection devices at the t-th time point in the main one-state quantity data.

S23, carrying out homologous comparison on the primary state quantity data and the primary state quantity data to generate a third state comparison value;

the third state comparison value is:

wherein X is ₃ And comparing the third state with the comparison value.

It can be understood that if the first state comparison value, the second state comparison value and the third state comparison value are 0, the state quantity data homology is explained, and the state quantity data is accurate; if the data is not 0, the condition that the line protection action is possibly abnormal is indicated, and specific state quantity data are required to be found for verification.

Step 205, determining a target action type corresponding to the fault signal according to the comparison result and the initial action type.

Optionally, the target action types include a first target action type, a second target action type, a third target action type, a fourth target action type, a fifth target action type, a sixth target action type, a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, and the step 205 specifically includes the following substeps S30-S39:

s30, if the initial action type is the first initial action type and the homologous comparison result meets a first preset comparison condition, determining that the target action type is the first target action type.

Optionally, the first preset comparison condition is that the first analog comparison value, the second analog comparison value, the third analog comparison value, the first state comparison value, the second state comparison value and the third state comparison value are equal to 0; the first target action type corresponds to the situation that the current direction of the current line of the local side and the current direction of the line opposite to the current direction of the line are both positive, the protection action generating position is the main protection device, and the first simulation comparison value, the second simulation comparison value, the third simulation comparison value, the first state comparison value, the second state comparison value and the third state comparison value are equal to 0, so that the protection action corresponding to the fault signal can be determined as the correct action.

S31, if the initial action type is the first initial action type and the homology comparison result meets a second preset comparison condition, determining that the target action type is the second target action type.

Optionally, the second preset comparison condition is that the third analog comparison value or the third state comparison value is not equal to 0; the second target action type corresponds to the situation that the current direction of the current line of the local side and the current direction of the current line of the opposite side are both forward, the protection action generating position is the main protection device, and the third simulation comparison value or the third state comparison value is not equal to 0, so that the protection action corresponding to the fault signal can be determined to be the protection refused action, and the situation that the main protection acts correctly and the main protection acts incorrectly may exist.

S32, if the initial action type is the first initial action type and the homology comparison result meets a third preset comparison condition, determining that the target action type is the third target action type.

Optionally, the third preset comparison condition is that the first analog comparison value or the first state comparison value is not equal to 0; the third target action type corresponds to the situation that the current direction of the current line of the local side and the current direction of the current line of the opposite side are both forward, the protection action generating position is the main protection device, and the first simulation comparison value or the first state comparison value is not equal to 0, so that the protection action corresponding to the fault signal can be determined to be the protection refusal action, and the situation that the main protection is not operated correctly or the fault wave recording device is configured in error possibly exists.

S33, if the initial action type is the first initial action type and the homology comparison result meets a fourth preset comparison condition, determining that the target action type is the fourth target action type.

Optionally, the fourth preset comparison condition is that the second analog comparison value or the second state comparison value is not equal to 0; the fourth target action type corresponds to the situation that the current direction of the current line of the local side and the current direction of the current line of the opposite side are both forward, the protection action generating position is the main protection device, and the second simulation comparison value or the second state comparison value is not equal to 0, so that the protection action corresponding to the fault signal can be determined to be the protection refusal action, and the situation that the main protection device and the second protection do not act correctly or the fault wave recording device is configured in error possibly exists.

S34, if the initial action type is the second initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the fifth target action type.

Optionally, the fifth preset comparison condition is that the first analog comparison value, the second analog comparison value or the third analog comparison value is not equal to 0; the fifth target action type corresponds to the situation that the current direction of the current line of the side line and the current direction of the opposite side line are both forward, the switch state is not in an off state after an accident, and the first analog comparison value, the second analog comparison value or the third analog comparison value is not equal to 0, so that the protection action corresponding to the fault signal can be determined to be protection refusal action or switch refusal action, and the situation that the fixed value of the protection device is set wrong or the wiring of the current-voltage loop is wrong may exist.

S35, if the initial action type is the second initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the sixth target action type.

Optionally, the sixth preset comparison condition is that the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0; the sixth target action type corresponds to the situation that the current direction of the current line of the side line and the current direction of the opposite line are both forward, the switch state is not in an off state after an accident, and the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0, so that the protection action corresponding to the fault signal can be determined to be protection refusing action or switch refusing action, and the situation that the protection outlet pressing plate is not thrown or the switch body refuses action possibly exists.

S36, if the initial action type is the third initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the seventh target action type.

Optionally, the seventh target action type corresponds to the case that the current direction of the current line is forward, the current direction of the opposite line is reverse, the action occurrence position is the main protection device, and the first analog comparison value, the second analog comparison value or the third analog comparison value is not equal to 0, and it can be further determined that the protection action corresponding to the fault signal is one type of protection misoperation.

S37, if the initial action type is the third initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the eighth target action type.

Optionally, the eighth target action type corresponds to the case that the current direction of the current line is forward, the current direction of the opposite line is reverse, the action occurrence position is the main protection device, and the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0, and it can be further determined that the protection action corresponding to the fault signal is one type of protection misoperation.

S38, if the initial action type is the fourth initial action type and the homology comparison result meets a fifth preset comparison condition, determining that the target action type is the ninth target action type.

Optionally, the ninth target action type corresponds to the case that the current direction of the current line is forward, the current direction of the opposite line is reverse, the action occurrence position is a backup protection device, and the first analog comparison value, the second analog comparison value or the third analog comparison value is not equal to 0, and it can be further determined that the protection action corresponding to the fault signal is one type of protection malfunction.

S39, if the initial action type is the fourth initial action type and the homology comparison result meets a sixth preset comparison condition, determining that the target action type is the tenth target action type.

Optionally, when the tenth target action type corresponds to the case that the current direction of the current line is forward, the current direction of the opposite line is reverse, the action occurrence position is a backup protection device, and the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0, it may be further determined that the protection action corresponding to the fault signal is one type of protection malfunction.

Note that, the seventh target action type, the eighth target action type, the ninth target action type, and the tenth target action type correspond to different protection malfunction situations, and specific malfunction causes need to be further analyzed according to the interval data.

And 206, when the target action type belongs to a preset first action set, constructing a fault analysis report corresponding to the fault signal by adopting interval data corresponding to the fault signal.

Optionally, the first set of actions includes a first target action type, a second target action type, a third target action type, a fourth target action type, a fifth target action type, and a sixth target action type, and in particular reference may be made to the corresponding explanation in step 205.

And step 207, when the target action type belongs to a preset second action set, constructing a fault analysis report corresponding to the fault signal by adopting the false action type corresponding to the interval data.

Optionally, the second action set includes a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, where the malfunction types include a first malfunction type, a second malfunction type, a third malfunction type, a fourth malfunction type, a fifth malfunction type, a sixth malfunction type, a seventh malfunction type, and an eighth malfunction type, and specific reference may be made to the corresponding explanation in step 205; step 207 specifically includes the following substeps S40-S49:

and S40, when the target action type is a seventh target action type, an eighth target action type, a ninth target action type or a tenth target action type, acquiring interval data corresponding to the fault signal.

S41, if the target action type is the seventh target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is a first misoperation type.

Optionally, the interval data comprises a protection device fixed value, a standard fixed value of a standard fixed value list, a zero sequence current of the main protection device and a differential stream of the main protection device; the first preset misoperation condition is that the fixed value of the protection device is equal to the standard fixed value, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are in a preset range; the first misoperation type corresponds to the situation that the current direction of the current line of the side line is forward, the current direction of the opposite line is reverse, the action occurrence position is the main protection device, the first simulation comparison value, the second simulation comparison value or the third simulation comparison value is not equal to 0, the fixed value of the protection device is equal to the standard fixed value, the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are in the preset range, the protection operation corresponding to the fault signal can be determined as protection misoperation, and the situation that the CT (Current Transformer, the current transformer) of the primary equipment is connected reversely or the CT is disconnected can exist.

It should be noted that the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device may be set according to the actual operation condition of the power system. When the line normally operates, the zero sequence voltage U1 of the main protection device ₀ Zero sequence voltage U2 of main two protection devices ₀ Negative sequence voltage U1 of main protection device ₂ Negative sequence voltage U2 of main two protection devices ₂ Rated voltage U of protection device which is less than or equal to 0.05 times _n Differential flow I1 of the main protection device ₀ Differential flow I2 with primary and secondary protection ₀ Rated current I of protection device which is less than or equal to 0.05 times _n Three-phase voltage U1 of main protection device _A 、U1 _B And U1 _C Three-phase voltage U2 of main two protection devices _A 、U2 _B And U2 _C Rated voltage U of protection device which is equal to or more than 0.95 times _n And less than or equal to 1.05 times of rated voltage U of the protection device _n The zero sequence voltage of the main protection device can be controlled according to the characteristicsThe preset ranges of the negative sequence voltage and the differential flow are set.

S42, if the target action type is the seventh target action type or the eighth target action type and the interval data meets a second preset malfunction condition, determining that the malfunction type is a second malfunction type.

Optionally, the second preset malfunction condition is that the fixed value of the protection device is not equal to the standard fixed value; the second misoperation type corresponds to the situation that the current direction of the current line of the side is the forward direction, the current direction of the opposite line is the reverse direction, the action occurrence position is the main protection device, the first simulation comparison value, the second simulation comparison value, the third simulation comparison value, the first state comparison value, the second state comparison value or the third state comparison value are not equal to 0, and the fixed value of the protection device is not equal to the standard fixed value, the protection operation corresponding to the fault signal can be determined as the protection misoperation, and the situation that the fixed value of the protection device is set wrong possibly exists.

S43, if the target action type is the seventh target action type or the eighth target action type and the interval data meets a third preset malfunction condition, determining that the malfunction type is a third malfunction type.

Optionally, the third preset malfunction condition is that the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are not in a preset range; the third malfunction type corresponds to the situation that the current direction of the current Line of the main protection device is forward, the current direction of the opposite Line is reverse, the action occurrence position is the main protection device, the first simulation comparison value, the second simulation comparison value, the third simulation comparison value, the first state comparison value, the second state comparison value or the third state comparison value are not equal to 0, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are not in the preset range, the protection action corresponding to the fault signal can be determined as the protection malfunction, and the situation that the N Line (Neutral Line) virtual connection exists can be determined. The setting of the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential flow of the main protection device can be specifically explained with reference to the correspondence in step S41.

S44, if the target action type is the eighth target action type and the interval data meets a first preset malfunction condition, determining that the malfunction type is a fourth malfunction type.

Optionally, the fourth misoperation type corresponds to the situation that the current direction of the current line is positive, the current direction of the opposite line is reverse, the action occurrence position is the main protection device, the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0, the fixed value of the protection device is equal to the standard fixed value, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are in the preset range; after the malfunction type is determined to be the fourth malfunction type, the switching state of the primary equipment needs to be confirmed, and if the switching state of at least one of the main protection device, the main protection device and the secondary protection device or the recorder is inconsistent with the switching state of the primary equipment and an alarm condition related to a control loop short wire exists, the problems of wrong wiring, disconnection or switch body of the control loop may exist. The setting of the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential flow of the main protection device can be specifically explained with reference to the correspondence in step S41.

S45, if the target action type is the ninth target action type and the interval data meets a first preset misoperation condition, determining that the misoperation type is a fifth misoperation type.

Optionally, the fifth malfunction type corresponds to the situation that the current direction of the current line is forward, the current direction of the opposite line is reverse, the action occurrence position is a backup protection device, the first analog comparison value, the second analog comparison value or the third analog comparison value is not equal to 0, the fixed value of the protection device is equal to the standard fixed value, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are in the preset range, so that the protection action corresponding to the fault signal can be determined as protection malfunction, and the protection malfunction trip may exist, and the condition that the CT of the primary equipment is connected reversely or the CT is disconnected. The setting of the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential flow of the main protection device can be specifically explained with reference to the correspondence in step S41.

S46, if the target action type is the ninth target action type or the tenth target action type and the interval data meets a second preset malfunction condition, determining that the malfunction type is a sixth malfunction type.

Optionally, the sixth malfunction type corresponds to the case that the current direction of the current line is forward, the opposite-side line current direction is reverse, the action occurrence position is a backup protection device, the first analog comparison value, the second analog comparison value, the third analog comparison value, the first state comparison value, the second state comparison value or the third state comparison value are not equal to 0, and the protection device fixed value is not equal to the standard fixed value, so that the protection action corresponding to the fault signal can be determined as protection malfunction, and the protection override trip may exist, and the protection device fixed value is set in error.

S47, if the target action type is the ninth target action type or the tenth target action type and the interval data meets a third preset malfunction condition, determining that the malfunction type is a seventh malfunction type.

Optionally, the seventh malfunction type corresponds to the case that the current direction of the current line is forward, the opposite-side line current direction is reverse, the action occurrence position is a backup protection device, the first analog comparison value, the second analog comparison value, the third analog comparison value, the first state comparison value, the second state comparison value or the third state comparison value are not equal to 0, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are not in the preset range, so that the fault analysis conclusion of the protection action corresponding to the fault signal can be determined to be protection malfunction, and the situations of protection override trip and N-line virtual connection may exist. The setting of the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential flow of the main protection device can be specifically explained with reference to the correspondence in step S41.

S48, if the target action type is the tenth target action type and the interval data meets a first preset malfunction condition, determining that the malfunction type is an eighth malfunction type.

Optionally, the eighth misoperation type corresponds to the situation that the current direction of the current line of the main circuit is forward, the current direction of the opposite circuit is reverse, the action occurrence position is a backup protection device, the first state comparison value, the second state comparison value or the third state comparison value is not equal to 0, the fixed value of the protection device is equal to the standard fixed value, and the zero sequence voltage, the negative sequence voltage and the differential current of the main protection device are in a preset range; after the misoperation type is determined to be the eighth misoperation type, the switching state of the primary equipment needs to be confirmed, and if the switching state of at least one of the main protection device, the main protection device and the secondary protection device or the wave recorder is inconsistent with the switching state of the primary equipment and an alarm condition related to a control loop short wire exists, protection override trip, and the control loop wiring error, disconnection or switch body problem possibly exists. The setting of the preset ranges of the zero sequence voltage, the negative sequence voltage and the differential flow of the main protection device can be specifically explained with reference to the correspondence in step S41.

S49, constructing a fault analysis report corresponding to the fault signal by adopting the misoperation type and the interval data.

Optionally, a fault analysis report provided in the second embodiment of the present invention is shown in table 1, where the report information includes a fault time, a fault device, a fault phase, a trip phase, a fault current, a fault voltage, a fault ranging, a reclosing action, and the like.

TABLE 1 failure analysis report

In the second embodiment of the invention, firstly, line intervals corresponding to fault signals are confirmed through topology data of a power system, data on two sides of the line intervals are obtained, then, the initial action type of the fault is determined through line included angles and protection device data, the target action type of the fault is determined according to the homology comparison result of the protection device data and the wave recording data, and finally, a fault analysis report is constructed by combining the interval data. The topology data is adopted to confirm the line interval and then acquire the data, so that the system condition can be comprehensively known, various conditions of the bus and the lines at two sides related to the fault point can be comprehensively known, and the comprehensiveness of fault analysis is ensured; the line data, the protection device data and the recording data are used for analyzing and judging the fault reason of the power system in combination with the preset action types, so that the efficiency of fault analysis of the power system is improved, the situation that partial data sources possibly have abnormality is considered, and the accuracy of the fault analysis conclusion of the power system is improved.

Referring to fig. 4, fig. 4 is a block diagram illustrating a power system fault analysis system according to a third embodiment of the present invention.

The third embodiment of the invention provides a power system fault analysis system, which comprises:

The data acquisition module 401 is configured to, when a fault signal of the power system is received, acquire a line angle, protection device data and recording data corresponding to the fault signal.

The initial determining module 402 is configured to determine an initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval.

And the comparison processing module 403 is configured to perform homologous comparison on the protection device data and the recording data, and generate a comparison result.

And the target determining module 404 is configured to determine a target action type corresponding to the fault signal according to the comparison result and the initial action type.

And the first construction module 405 is configured to construct a fault analysis report corresponding to the fault signal by using interval data corresponding to the fault signal when the target action type belongs to a preset first action set.

And a second construction module 406, configured to construct a fault analysis report corresponding to the fault signal by adopting the malfunction type corresponding to the interval data when the target action type belongs to a preset second action set.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating data interaction of a secondary intelligent operation and maintenance platform according to a fourth embodiment of the present invention.

The power system fault analysis system can be constructed based on a secondary intelligent operation and maintenance platform. As shown in fig. 5, the secondary intelligent operation and maintenance platform further comprises a master station database, and the secondary intelligent operation and maintenance platform acquires primary equipment states, line data, topology data and the like of the power system through data interaction with the OCS system; the secondary intelligent operation and maintenance platform performs data interaction with the on-site intelligent recorder through a firewall and an encryption device to obtain analog quantities and state quantities such as fault current, fault voltage, action phase, action time and the like of each protection device, and action messages and alarm signals sent by the protection devices; meanwhile, the intelligent recorder substation can generate corresponding wave recording information and send the corresponding wave recording information to the secondary intelligent operation and maintenance platform during the protection action.

The embodiment of the invention also provides a power system fault analysis device, which comprises:

and the processor is used for executing the power system fault analysis method according to the instructions in the program codes.

The embodiment of the invention also provides a computer readable storage medium for storing program code which, when executed by a processor, is used for executing the power system fault analysis method.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system, module and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of power system fault analysis, comprising:

2. The method for analyzing a fault of a power system according to claim 1, wherein when a fault signal of the power system is received, obtaining a line included angle, protection device data and recording data corresponding to the fault signal includes:

when a fault signal of a power system is received, determining a line interval corresponding to the fault signal according to topology data of the power system;

3. The power system fault analysis method of claim 1, wherein the protection device data includes a post-accident switch state and an action occurrence location, the initial action types including a first initial action type, a second initial action type, a third initial action type, and a fourth initial action type; the determining the initial action type corresponding to the fault signal according to the protection device data, the line included angle and a preset included angle interval comprises the following steps:

4. The power system fault analysis method according to claim 3, wherein the target action types include a first target action type, a second target action type, a third target action type, a fourth target action type, a fifth target action type, a sixth target action type, a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, and the determining the target action type corresponding to the fault signal according to the comparison result and the initial action type specifically includes:

5. The power system fault analysis method according to claim 4, wherein the second action set includes a seventh target action type, an eighth target action type, a ninth target action type, and a tenth target action type, and the malfunction types include a first malfunction type, a second malfunction type, a third malfunction type, a fourth malfunction type, a fifth malfunction type, a sixth malfunction type, a seventh malfunction type, and an eighth malfunction type; when the target action type belongs to a preset second action set, constructing a fault analysis report corresponding to the fault signal by adopting a false action type corresponding to the interval data, wherein the fault analysis report comprises the following steps:

6. The power system fault analysis method according to claim 1, wherein the protection device data further includes main protection simulation data and main second protection simulation data, the recording data includes recording simulation data, and the comparison result includes a first simulation comparison value, a second simulation comparison value, and a third simulation comparison value; the step of carrying out homologous comparison on the protection device data and the recording data to generate a comparison result comprises the following steps:

The first analog comparison value is:

the second analog comparison is:

the third analog comparison value is:

wherein Y is ₃ And the third simulation comparison value.

7. The power system fault analysis method according to claim 1, wherein the protection device data further includes main protection state data and main second protection state data, the recording data further includes recording waveform state data, and the comparison result further includes a first state comparison value, a second state comparison value, and a third state comparison value; the step of carrying out homologous comparison on the protection device data and the recording data to generate a comparison result, and the step of further comprising:

the first state comparison value is:

the second state comparison value is:

the third state comparison value is:

wherein X is ₃ And comparing the third state with the comparison value.

8. A power system fault analysis system, comprising:

9. An electric power system failure analysis apparatus, characterized by comprising:

a processor for executing the power system fault analysis method according to any one of claims 1-7 according to instructions in the program code.

10. A computer readable storage medium for storing program code which, when executed by a processor, is adapted to carry out the power system fault analysis method of any one of claims 1-7.