CN111914377B - Method and system for repairing feeder line loss model, computer equipment and readable storage medium - Google Patents
Method and system for repairing feeder line loss model, computer equipment and readable storage medium Download PDFInfo
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Abstract
The invention relates to a method and a system for repairing a feeder line loss model, computer equipment and a readable storage medium. The method comprises the following steps: in a feeder topological structure of a power distribution network, determining a key area corresponding to a tie switch; acquiring the electrical information of each key platform area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key platform area and the voltage phase angle of the key platform area; judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent or not; if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder enters a transfer state, and updating the feeder line loss model according to the state of each key area.
Description
Technical Field
The present invention relates to the field of power distribution network line loss calculation technologies, and in particular, to a method and a system for repairing a feeder line loss model, a computer device, and a readable storage medium.
Background
With the high-speed development of social economy, the power consumption load continuously rises, the loss generated by the transmission to users through the power network is increased, and the line loss of the distribution network is about 40% of the loss of the whole power network according to statistics, wherein the 10kV feeder line loss electric quantity is about 50%, so that the reduction of the power network line loss rate is one of important ways for reducing the cost under the background of improving quality and enhancing efficiency and compressing cost of a power network company, and the accurate feeder line loss calculation is a basic condition for realizing abnormal line loss positioning and line loss management.
Under the high-reliability power supply requirements of compressing the power failure time of a user and reducing the influence range of the power failure, aiming at the situations of unavoidable load transfer, planned maintenance, fault processing and the like in a power distribution network, one common processing mode is to transfer part of load of a fault or high-load line to another feeder line in communication with the line for power supply, so that the feeder line power supply topological structure of the power distribution network changes along with the transfer working condition. In the aspect of 10kV feeder line loss management, at present, common monthly line loss calculation and daily line loss calculation are carried out, and in the aspect of monthly line loss calculation, if a single feeder line loss model is adopted for calculating monthly feeder line loss, the result cannot accurately reflect the actual line loss, and the accuracy of line loss calculation is greatly influenced; in the aspect of daily line loss calculation, upgrading and updating of a power grid metering device and quasi-real-time acquisition data of a 10kV feeder and an affiliated station area enable daily line loss calculation based on the metering acquisition data, generally, metering point electric quantity of a certain feeder under a transformer substation is taken as feeding electric quantity, and station area metering point electric quantity of the affiliated feeder is taken as feeding electric quantity to establish a feeder line loss model, so that the feeder line loss is calculated. Although the calculation accuracy of the solar line loss is greatly improved compared with the lunar line loss, the original line loss and the station area under the transfer line loss of the line topological junction are changed under the transfer working condition, the line loss model established according to the line change scheme relation cannot be correspondingly adjusted, at the moment, the power supply quantity in the line model is different from the real power supply quantity, so that the accuracy of the line loss rate of the line is lower, and the abnormal line loss rate with a larger negative value can appear when the accuracy is serious.
Two common methods for treating abnormal line loss caused by a transfer working condition are provided, namely, a line loss model is manually corrected, but when a feeder line transfer state is finished, the feeder line is manually restored to an initial state, the repeated correction process brings huge pressure to basic operation and maintenance work, and meanwhile, the timeliness and the accuracy of line loss calculation are influenced by passive correction after the abnormal line loss occurs; secondly, the model correction is automatically completed by opening and providing the topology relation system interface of the distribution network, but the method needs to newly establish an interface and monitor the data transmission condition, so that the construction and application cost of the line loss calculation module is increased, and the sudden line transfer topology change transmission information has a certain delay from acquisition to transmission to the line loss calculation module, so that the calculation timeliness is inevitably affected to a certain extent.
Disclosure of Invention
Based on the above, the invention provides a method and a system for repairing a feeder line loss model, a computer device and a readable storage medium, which are used for automatically identifying a transfer condition to correct the feeder line loss model and improving the calculation accuracy of the line loss.
The invention provides a method for repairing a feeder line loss model, which comprises the following steps:
in a feeder topological structure of a power distribution network, determining a key area corresponding to a tie switch;
Acquiring the electrical information of each key platform area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key platform area and the voltage phase angle of the key platform area;
Judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent or not;
if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node;
when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder enters a transfer state, and updating the feeder line loss model according to the state of each key area.
In one embodiment, the obtaining, in near real time, the electrical information of each of the key areas includes:
And acquiring the corresponding electrical information of the key station area from the metering master station according to the identification information of the key station area.
In one embodiment, the tie switch corresponds to three of the key zones;
The judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same collection time node is consistent or not comprises the following steps:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
In one embodiment, the voltages of the key areas are all three-phase voltages (u iA,uiB,uiC), wherein i is a positive integer;
Judging whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node or not, comprising:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
In one embodiment, the electrical information further includes a three-phase voltage imbalance of the key pad.
In one embodiment, when the voltage phase angles of all the key areas corresponding to the same tie switch are changed at the same acquisition time node, before determining that the feeder line enters the transfer state, the method further includes:
And when the phase angles of the voltages of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging whether the three-phase voltage unbalance degree of each key area is changed.
In one embodiment, the feeder line loss model is updated according to the parameter data of all the key areas acquired last time.
Based on the same inventive concept, the embodiment of the invention also provides a repair system of the feeder line loss model, comprising:
The acquisition module is used for determining key areas corresponding to the interconnection switches in the feeder topological structure of the power distribution network and acquiring the electrical information of each key area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key area and the voltage phase angle of the key area;
The judging module is electrically connected with the acquiring module and is used for judging whether the change trend of the voltage amplitude values of all the key platform areas corresponding to the same contact switch at the same acquisition time node is consistent; if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state; and
And the updating module is electrically connected with the judging module and is used for updating the feeder line loss model according to the state of each key platform area.
In one embodiment, the tie switch corresponds to three of the key zones;
The judging module is used for judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent, and is specifically used for:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
In one embodiment, the voltages of the key areas are all three-phase voltages (u iA,uiB,uiC), wherein i is a positive integer;
The judging module for judging whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node is provided with a function for:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
Based on the same inventive concept, the embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the method of any of the embodiments described above.
Based on the same inventive concept, the embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the foregoing embodiments are implemented.
In summary, the embodiment of the invention provides a method and a system for repairing a feeder line loss model, computer equipment and a readable storage medium. Wherein the method comprises: in a feeder topological structure of a power distribution network, determining a key area corresponding to a tie switch; acquiring the electrical information of each key platform area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key platform area and the voltage phase angle of the key platform area; judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent or not; if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder enters a transfer state, and updating the feeder line loss model according to the state of each key area. According to the invention, the electrical information of each key platform area is acquired in near real time, whether the transfer condition occurs is determined according to multiple judging conditions of the electrical information of the key platform area, and the line loss feeder module is updated in time after the transfer condition is determined, so that the updating speed of the feeder line loss model is increased, and the accuracy of calculating the line loss is further improved.
Drawings
FIG. 1 is an exemplary schematic diagram of a power supply topology with a connection;
Fig. 2 is a schematic flow chart of a method for repairing a feeder line loss model according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of another method for repairing a feeder line loss model according to an embodiment of the present invention;
Fig. 4 is an electrical schematic diagram of a repair system for a feeder line loss model according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
It can be understood that the 10kV distribution network is located at the end of the power system, and is an important link for connecting the power generation system or the power transmission and transformation system with the user equipment, and distributes electric energy and supplies electric energy to the user, which has obvious regional characteristics along with the distribution of the user, so that the distribution of the distribution network is more complex than the distribution of the power transmission network, and the distribution difference of the power supply users of different feeder lines leads to a larger difference of the topology structure of the distribution network, and according to the property of the feeder lines in the distribution network, the voltage distribution of different feeder lines in a key area can be used as important marks for distinguishing different feeder lines, for example, in fig. 1, the voltage data of the areas 1,2 and 3 on two feeder lines respectively have a certain difference due to the difference of the topology structures of the two feeder lines and the power consumption conditions of the user on the line.
At present, the line loss calculation repair of the feeder line under the working condition of transferring the 10kV feeder line mainly manually corrects a line loss calculation model after the abnormality of the line loss is found by manpower, or a new line power supply topological structure is obtained by creating an interface with other systems, so that the existing line loss model of the feeder line has larger dependence on manpower or other systems under the working condition of transferring, has low response speed and low accuracy of a line loss calculation result. Moreover, the passive correction workload of the transfer working condition is large by means of manual judgment, the post-abnormal correction after the calculation of the solar line loss has larger time delay, and the line loss calculation precision is low due to the leakage processing of the line loss with smaller transfer influence. In addition, the development cost of the interface is increased by providing a line topological structure through a data interface depending on other systems, and a certain time delay exists from the condition of transferring to the line loss calculation function module.
Based on the method, the invention can provide a repair method for the feeder line loss model, the existing collected data is utilized to automatically identify the transfer working condition to repair the feeder line loss model, and the accuracy of the calculation result of the feeder line loss is improved. Referring to fig. 2 and 3, the method for repairing the feeder line loss model includes:
step S210, determining a key platform area corresponding to a tie switch in a feeder topological structure of a power distribution network;
Step S220, obtaining the electrical information of each key platform area in near real time, wherein the working electrical information comprises the voltage amplitude value of the key platform area and the voltage phase angle of the key platform area;
Step S230, judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent;
step S240, when the variation trend of the voltage amplitudes of all the key areas corresponding to the same interconnection switch at the same collection time node is consistent, determining whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the collection time node;
step S260, when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, determining that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key area.
Taking the power distribution network shown in fig. 1 as an example, a key area (or a transformer) is determined by taking a tie switch S2 in a single line diagram of a power distribution network feeder line as a center, and the key area 1, the key area 2 and the key area 3 which are closest to S2 on an original power supply feeder line i are respectively defined. It should be noted that "nearest" herein is the topological nearest, and the first transformer "T-connected" on the main line is generally used as the nearest station, i.e. the key station corresponding to the tie switch.
In the embodiment of the invention, the electrical information of each key platform area is acquired in near real time, and whether the transfer condition occurs or not is determined according to multiple judging conditions of the electrical information of the key platform area, so that the accuracy of monitoring the transfer working condition is ensured, and the authenticity of a feeder line loss calculation model is improved; and the line loss feeder module is updated in time after the transfer condition is determined, so that the updating speed of the feeder line loss model is increased, and the accuracy of line loss calculation is further improved. In the monitoring process, the time interval for collecting the electrical information can be 5min, 10min and the like, and the specific time length can be set according to actual needs.
In one embodiment, the obtaining, in near real time, the electrical information of each of the key areas includes:
And acquiring the corresponding electrical information of the key station area from the metering master station according to the identification information of the key station area.
In this embodiment, the identification information of the first key area (i.e. key area 1), the second key area (i.e. key area 2) and the third key area (i.e. key area 3) is obtained from the metering master station, and the electrical information of each key area sent by the corresponding negative control terminal or distribution terminal is obtained; wherein the electrical information includes at least a bay voltage amplitude (U iA、UiB、UiC) and a voltage phase angleWhere i represents key regions 1,2,3, respectively. That is, whether the transfer occurs or not and the transfer occurrence time point can be identified by directly utilizing the data of the metering acquisition system, so that the operation and maintenance workload caused by abnormal line loss under the transfer working condition is reduced, and the design and development cost caused by the need of opening other system interfaces to acquire the data required for judging whether the transfer occurs or not is reduced.
In one embodiment, the tie switch corresponds to three of the key zones;
The judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same collection time node is consistent or not comprises the following steps:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
It can be understood that the high-voltage side voltage and the variation trend of the key area (or the distribution transformer) belonging to the same feeder line have certain consistency, so that the voltage amplitude and the variation trend of the area collected in the metering system are utilized to identify the transfer working condition for completing the automatic repair of the feeder line loss model, the voltage of the key area has larger difference before and after transfer, and the difference between the voltages before and after the transfer is used as the basis for judging whether the transfer occurs.
In this embodiment, the three-phase voltage (U 1A、U1B、U1C) of the first key area and the three-phase voltage (U 2A、U2B、U2C) of the second key area and the change trend thereof are used as trigger conditions for monitoring whether the transferring working condition occurs. If the three-phase voltage amplitude and the change trend thereof on the first key area are similar to the three-phase voltage amplitude and the change trend thereof on the second key area, the next step is entered. For example, according to the size change trend of U iA、UiB、UiC (where i=1, 2), that is, when the same voltage corresponding to the same acquisition time is increased/decreased at the same time as compared with the previous acquisition time, the repair method of the feeder line loss model is triggered to perform the next operation, that is, the same voltage corresponding to the same acquisition time node at the same acquisition time node and the second key area is increased/decreased at the same time as the trigger condition. In other words, the embodiment monitors the three-phase voltage amplitude values and the change trend of the three-phase voltage amplitude values of the two key areas simultaneously to serve as the primary trigger condition, so that the influence of sudden power load increase or sudden shutdown of the distribution transformer area on the judgment condition taking the three-phase voltage change as the primary is avoided, and the misjudgment probability and the calculation resource consumption are reduced.
After monitoring that the magnitudes of the three-phase voltage (U 1A、U1B、U1C) of the first key area and the three-phase voltage (U 2A、U2B、U2C) of the second key area and the change trend thereof have similar change trends, determining whether the change trend of the three-phase voltage amplitude (U 3A、U3B、U3C) of the key area 3 has a significant change with the first key area and the second area at the same acquisition time point, and the voltage of the next voltage acquisition point has similar change trend, for example: if the same acquisition time U iA、UiB、UiC (i=1, 2, 3) has the same size ordering and/or the same increasing/decreasing trend is the same as that of U iA、UiB、UiC (i=1, 2) at the same time U 3A、U3B、U3C relative to the previous time, the change trend of all key areas corresponding to the contact switch S2 at the same acquisition time node is determined to be consistent.
In one embodiment, the voltages of the key areas are all three-phase voltages (U iA、UiB、UiC), where i is a positive integer;
Judging whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node or not, comprising:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
In this embodiment, determining whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node generally includes two steps: firstly, determining the change trend of the voltage amplitude of each phase of voltage corresponding to the key platform region at the acquisition time node according to the electrical information corresponding to the key platform region; namely, respectively acquiring the variation and the variation trend of the voltage amplitude of the U iA、UiB、UiC relative to the last acquired etching; then, judging whether the change trend of the A-phase voltage U 1A of the first key table area is consistent with the change trend of the A-phase voltage U 2A of the second key table area, whether the change trend of the B-phase voltage U 1B of the first key table area is consistent with the change trend of the B-phase voltage U 2B of the second key table area, whether the change trend of the C-phase voltage U 1C of the first key table area is consistent with the change trend of the C-phase voltage U 2C of the second key table area, and determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key table area at the acquisition time node according to the electric information corresponding to the second key table area; since the voltage changes on the same feeder line are consistent, the voltage changes of each phase should be consistent when switching occurs.
In addition, when a certain distribution line in the distribution network is diverted, besides the voltage amplitude of each key area, the voltage phase angle of each key area also changes correspondingly, so that the key areas 1-3 are monitored(Wherein i=1, 2 and 3) changes at the same acquisition time node, when the switching working condition occurs, three-phase voltage of 3 key areas changes due to a power supply line or a topological structure, and the/> of 3 transformersThe data is changed at the same time, and the factors such as disturbance of the collected data are filtered by taking the data as a judging condition, so that the accuracy of the transfer working condition is further improved.
Because one possibility that the 10kV feeder enters the transferring operation mode is to isolate faults in the line, common faults in the distribution line are single-phase grounding, and therefore obvious voltage unbalance of three-phase voltages during single-phase grounding can be used as an auxiliary judgment mark. Based on this, in one embodiment, the electrical information further includes the three-phase voltage unbalance degree of the key table area, and in the judging process, the obvious voltage unbalance degree of the three-phase voltage is used as an auxiliary identifier for judging whether the transfer occurs, so that the accuracy of the judgment is further improved.
In one embodiment, when the voltage phase angles of all the key areas corresponding to the same tie switch are changed at the same acquisition time node, before determining that the feeder line enters the transfer state, the method further includes:
Step S250, judging whether the three-phase voltage unbalance degree of each key platform area is changed or not; if yes, judging that the feeder line enters a transferring state.
It can be understood that when a 10kV feeder line enters a transfer operation due to faults such as single-phase grounding of one key platform region, the three-phase unbalance degree of the key platform region can be obviously changed, and the three-phase unbalance degree of other key platform regions is not obviously changed, so that the judgment accuracy can be further improved by judging whether the three-phase voltage unbalance degree of each key platform region is changed or not as an auxiliary means for judging whether transfer occurs or not, and timely identifying transfer caused by the faults.
Further, after it is determined that the transfer condition does occur, in order to enable the feeder line loss model to be in a topology structure with the feeder power supply of the current power distribution network, the feeder line loss model needs to be updated. Based on this, in one embodiment, the feeder line loss model is updated according to the parameter data of all the key station areas acquired last time.
In this embodiment, when it is determined that transfer occurs in the feeder ii according to the key areas 1,2 and 3, for example, the tie switch S1 is turned off and the tie switch S2 is turned on, the feeder line loss model is updated according to the electrical information of each key area acquired last time and acquired from the metering master station, so that the updated feeder line loss model is consistent with the actual power supply situation.
Based on the same inventive concept, the embodiment of the present invention further provides a repair system for a feeder line loss model, referring to fig. 4, where the repair system for a feeder line loss model includes an obtaining module 410, a judging module 420, and an updating module 430.
The obtaining module 410 is configured to determine a key area corresponding to a tie switch in a feeder topology structure of a power distribution network, and obtain electrical information of each key area in near real time, where the working electrical information includes a voltage amplitude of the key area and a voltage phase angle of the key area.
The judging module 420 is electrically connected to the acquiring module 410, and is configured to judge whether the variation trend of the voltage amplitudes of all the key areas corresponding to the same tie switch at the same acquisition time node is consistent; if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node; and when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state.
The updating module 430 is electrically connected to the judging module 420, and is configured to update the feeder line loss model according to the status of each key area.
Aiming at various problems existing in the calculation of the feeder line loss under the current 10kV feeder line transfer working condition, the embodiment of the invention obtains the electrical information of each key platform area in a quasi-real time manner, and determines whether the transfer condition occurs according to multiple judging conditions of the electrical information of the key platform area, thereby ensuring the accuracy of monitoring the transfer working condition and improving the authenticity of a feeder line loss calculation model; and the line loss feeder module is updated in time after the transfer condition is determined, so that the updating speed of the feeder line loss model is increased, and the accuracy of line loss calculation is further improved.
In one embodiment, the tie switch corresponds to three key areas, and the three key areas are the first "T-junction" transformer closest to the tie switch in the topology of the power distribution network as the key area;
the determining module 420, configured to determine whether the change trends of the voltage amplitudes of all the key areas corresponding to the same tie switch at the same collection time node are consistent, is specifically configured to:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
It can be understood that the high-voltage side voltage and the variation trend of the key area (or the distribution transformer) belonging to the same feeder line have certain consistency, so that the voltage amplitude and the variation trend of the area collected in the metering system are utilized to identify the transfer working condition for completing the automatic repair of the feeder line loss model, the voltage of the key area has larger difference before and after transfer, and the difference between the voltages before and after the transfer is used as the basis for judging whether the transfer occurs. According to the method, the three-phase voltage amplitude values and the change trend of the three-phase voltage amplitude values of the two key areas are monitored simultaneously to serve as primary triggering conditions, so that the influence of sudden power load increase or sudden shutdown of the distribution transformer area on the primary judgment conditions of three-phase voltage change is avoided, and the misjudgment probability and the calculation resource consumption are reduced.
In one embodiment, the voltages of the key areas are all three-phase voltages (u iA,uiB,uiC), wherein i is a positive integer;
The judging module 420 for judging whether the voltage amplitude of the first key area is consistent with the trend of the voltage amplitude of the second key area at the collection time node, includes:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
In this embodiment, determining whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node generally includes two steps: firstly, determining the change trend of the voltage amplitude of each phase of voltage corresponding to the key platform region at the acquisition time node according to the electrical information corresponding to the key platform region; namely, respectively acquiring the variation and the variation trend of the voltage amplitude of the U iA、UiB、UiC relative to the last acquired etching; then, judging whether the change trend of the A-phase voltage U 1A of the first key table area is consistent with the change trend of the A-phase voltage U 2A of the second key table area, whether the change trend of the B-phase voltage U 1B of the first key table area is consistent with the change trend of the B-phase voltage U 2B of the second key table area, whether the change trend of the C-phase voltage U 1C of the first key table area is consistent with the change trend of the C-phase voltage U 2C of the second key table area, and determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key table area at the acquisition time node according to the electric information corresponding to the second key table area; since the voltage changes on the same feeder line are consistent, the voltage changes of each phase should be consistent when switching occurs.
In addition, when a certain distribution line in the distribution network is diverted, besides the voltage amplitude of each key area, the voltage phase angle of each key area also changes correspondingly, so that the key areas 1-3 are monitored(Wherein i=1, 2 and 3) changes at the same acquisition time node, when the switching working condition occurs, three-phase voltage of 3 key areas changes due to a power supply line or a topological structure, and the/> of 3 transformersThe data is changed at the same time, and the factors such as disturbance of the collected data are filtered by taking the data as a judging condition, so that the accuracy of the transfer working condition is further improved.
In one embodiment, the electrical information further includes a three-phase voltage imbalance of the key pad. When the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same collection time node, the judging module 420 is further configured to judge whether the three-phase voltage unbalance degree of each key area is changed before judging that the transfer occurs. In this embodiment, by determining whether the three-phase voltage unbalance degree of each key station area changes, the method can be used as an auxiliary means for determining whether the transfer occurs, and the transfer caused by the fault can be identified in time, so that the accuracy of the determination is further improved.
Based on the same inventive concept, the embodiments of the present invention also provide a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, can implement the steps of the method of any of the embodiments described above.
Based on the same inventive concept, the embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the foregoing embodiments are implemented.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (12)
1. The method for repairing the feeder line loss model is characterized by comprising the following steps of:
in a feeder topological structure of a power distribution network, determining a key area corresponding to a tie switch;
Acquiring the electrical information of each key platform area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key platform area and the voltage phase angle of the key platform area;
Judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent or not;
if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node;
When the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder enters a transfer state, and updating the feeder line loss model according to the electrical information of each key area.
2. The method for repairing a feeder line loss model according to claim 1, wherein the obtaining, in near real time, the electrical information of each of the key areas comprises:
And acquiring the corresponding electrical information of the key station area from the metering master station according to the identification information of the key station area.
3. The method for repairing a feeder line loss model of claim 1, wherein said tie switches correspond to three of said critical zones;
The judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same collection time node is consistent or not comprises the following steps:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
4. A method of repairing a feeder line loss model according to claim 3, wherein the voltages of the key regions are all three-phase voltages (u iA,uiB,uiC), where i is a positive integer;
Judging whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node or not, comprising:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
5. The method of repairing a feeder line loss model of claim 1, wherein the electrical information further comprises a three-phase voltage imbalance of the key pad region.
6. The method for repairing a feeder line loss model according to claim 5, wherein when voltage phase angles of all the key areas corresponding to the same tie switch are changed at the same acquisition time node, before determining that the feeder line enters a trans-feed state, the method further comprises:
And judging whether the three-phase voltage unbalance degree of each key platform area is changed or not.
7. The method for repairing a feeder line loss model according to claim 1, wherein the feeder line loss model is updated according to the parameter data of all the key areas acquired last time.
8. A repair system for a feeder loss model, comprising:
The acquisition module is used for determining key areas corresponding to the interconnection switches in the feeder topological structure of the power distribution network and acquiring the electrical information of each key area in quasi-real time, wherein the working electrical information comprises the voltage amplitude value of the key area and the voltage phase angle of the key area;
The judging module is electrically connected with the acquiring module and is used for judging whether the change trend of the voltage amplitude values of all the key platform areas corresponding to the same contact switch at the same acquisition time node is consistent; if yes, judging whether the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state; and
And the updating module is electrically connected with the judging module and is used for updating the feeder line loss model according to the electrical information of each key platform area.
9. The feeder line loss model repair system of claim 8, wherein the tie switches correspond to three of the critical zones;
The judging module is used for judging whether the change trend of the voltage amplitude values of all the key areas corresponding to the same interconnection switch at the same acquisition time node is consistent, and is specifically used for:
Judging whether the change trend of the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node;
if so, judging whether the voltage amplitude of the third key area is consistent with the change trend of the voltage amplitude of the first key area and/or the second key area at the acquisition time node.
10. The repair system for a feeder line loss model of claim 9, wherein the voltages of the key regions are all three-phase voltages (u iA,uiB,uiC), where i is a positive integer;
The judging module for judging whether the voltage amplitude of the first key area is consistent with the change trend of the voltage amplitude of the second key area at the acquisition time node is provided with a function for:
determining the change trend of the voltage amplitude of each phase of voltage corresponding to the first key area at the acquisition time node according to the electrical information corresponding to the first key area; determining the change trend of the voltage amplitude of each phase voltage corresponding to the second key area at the acquisition time node according to the electrical information corresponding to the second key area;
judging whether the change trend of the A-phase voltage of the first key table area is consistent with the change trend of the A-phase voltage of the second key table area, whether the change trend of the B-phase voltage of the first key table area is consistent with the change trend of the B-phase voltage of the second key table area, and whether the change trend of the C-phase voltage of the first key table area is consistent with the change trend of the C-phase voltage of the second key table area.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1-7.
12. A computer device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when the computer program is executed.
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