CN109659975B - Island detection method and system for active power distribution network - Google Patents
Island detection method and system for active power distribution network Download PDFInfo
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Abstract
The invention discloses an island detection method and system for an active power distribution network, wherein the method comprises the steps of modeling based on the type, grid-connected state, operation mode and control strategy of each power supply in the active power distribution network; establishing a communication link between each adjacent switch in the system, and gradually transmitting the running state of each power supply to other power supplies based on the power supply model information; the distributed power supply detects the accessibility of the distributed power supply and other power supplies in the system in real time, and island state judgment is carried out; and if the DG judges that the grid-connected state is changed into the island state, starting the coordination control to switch the operation mode. The invention realizes the step-by-step transmission of the operating states of all power supplies in the active power distribution network and the island state detection based on the reachability query, improves the adaptability of the island detection to different network frame wiring and different operating modes of the power distribution network, realizes the coordinated control of the DG operating mode after the island occurs by exchanging the power supply state information in real time by adjacent power distribution terminals in the system, and enhances the reliability and the flexibility of the operation of the active power distribution network.
Description
Technical Field
The invention relates to an active power distribution network island detection and coordination control method based on reachability query, and belongs to the technical field of relay protection of power systems.
Background
As an effective supplement to a large power grid, the distributed new energy power generation system can reduce the investment of the traditional fossil energy power generation system and can enhance the operation flexibility and reliability of the power system. However, when the large grid support is lost due to routine maintenance or fault tripping, the distributed new energy power generation system enters an island operation state.
Generally, due to the fluctuation of the distributed power sources and loads, the generated power and the local loads in the island system are not balanced, so that the island state can only last for a relatively short time. However, if the distributed power supply in the system has stronger regulation capability after the island occurs, or an energy storage system is configured, so that the output of the new energy power generation is approximately the same as the local load, the island system can stably run for a long time, and potential safety hazards are buried for power generation, control equipment, operation and maintenance personnel.
The existing island detection methods are divided into passive island detection, active island detection and remote island detection methods, wherein: the remote island detection method is limited by a remote communication channel, and has the problems that the method is not suitable for a complex power distribution network architecture, a multi-grid-connected point access mode and the like; for the existing passive island detection method, when a large power grid is lost and the power generation power in the system is close to the local load, the system voltage and frequency do not fluctuate obviously,
therefore, such passive island detection methods have detection dead zones; meanwhile, the existing active island detection method is an active injection method based on a single-machine inverter, and for a multi-machine parallel system with high permeability, different single-machine island detection strategies exist, so that disturbance signals are interfered with one another, and island detection fails or electric energy quality is deteriorated during normal operation.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, provides an active power distribution network island detection method and system based on reachability query, and realizes the step-by-step transmission of each power supply running state and island state detection in an active power distribution network based on the reachability query.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides an active power distribution network island detection method, which specifically includes the following steps:
establishing a power supply model based on the type, grid-connected state, operation mode and control strategy of each power supply in the active power distribution network;
establishing a communication link between each adjacent switch in the system;
each power supply sends a power supply model of the real-time state of the power supply to other power supplies step by step through a communication link;
and detecting the accessibility of the Distributed Generation (DG) and other power supplies in the system in real time according to the received power supply model, and judging the island state to obtain an island detection result.
The power supply types in the power supply model information comprise a large power grid power supply and a distributed power supply; the grid connection state comprises grid connection and grid disconnection; the operation mode is only effective to the distributed power supply, and comprises operation in a VF mode and operation in a PQ mode; the control strategy is only effective for the distributed power supplies, and includes allowing switching to the VF mode and disallowing switching to the VF mode, only one distributed power supply allowed to be switched to the VF mode is configured in the same region, and the distributed power supply with the largest content in the region is generally selected.
The detection, control and communication functions of each switch are realized by the power distribution terminals configured in the system, the adjacent switch power distribution terminals adopt General Object Oriented Substation Event (GOOSE) communication, and GOOSE information model input and output signals are configured based on a power supply model.
Each power supply grid-connected switch power distribution terminal acquires power supply running state information in real time, if the grid-connected switch is in a closed state, a power supply model of a power supply of the power supply grid-connected switch power distribution terminal is sent to the adjacent line switch power distribution terminal, and if the grid-connected switch is in a disconnected state, the power supply model is not sent; and after the line switch power distribution terminal receives the power supply models of the power supplies, if the line switch is in a closed state, the received power supply models of the power supplies are sent to the adjacent power distribution terminal, and if the line switch is in a breaking state, the power supply models are not sent.
If the DG receives that the power supply running state has a large power grid power supply or a distributed power supply running in the VF mode, judging that the DG runs in a grid-connected state; and if the DG does not receive any power supply model of the power supply, or the received power supply model does not have a large power grid power supply and a distributed power supply operating in the VF mode, judging that the DG operates in an island state.
When the DG is changed from a grid-connected state to an island state, if the DG is not allowed to be switched to the VF mode and the received power model has no distributed power supply allowed to be switched to the VF mode, immediately stopping and disconnecting the grid-connected switch; if the DG allows to be switched to the VF mode, or the received power model has distributed power supplies allowing to be switched to the VF mode, after the VF mode is successfully switched, the system maintains the operation of an island state.
The invention has the following beneficial effects:
1. the method for realizing the step-by-step transmission of the running states of all power supplies in the active power distribution network and the island state detection based on the reachability query improves the adaptability of the island detection to different network frame wiring and different running modes of the power distribution network;
2. the invention provides a coordinated control method of a DG operation mode after an island occurs, and the reliability and flexibility of the operation of an active power distribution network are enhanced.
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FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a system configuration diagram of the embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained with reference to the embodiments according to the drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
FIG. 1 is a flow chart of a method of an embodiment of the present invention; the embodiment provides an active power distribution network island detection method, which comprises the following steps:
establishing a power supply model based on the type, grid-connected state, operation mode and control strategy of each power supply in the active power distribution network;
establishing a communication link between each adjacent switch in the system;
each power supply sends a power supply model of the real-time state of the power supply to other power supplies step by step through a communication link;
and detecting the accessibility of the Distributed Generation (DG) and other power supplies in the system in real time according to the received power supply model, and judging the island state to obtain an island detection result.
In a specific embodiment, the power types in the power model information include large grid power and distributed power; the grid connection state comprises grid connection and grid disconnection; the operation mode is only effective to the distributed power supply, and comprises operation in a VF mode and operation in a PQ mode; the control strategy is only effective for the distributed power supplies, and includes allowing switching to the VF mode and not allowing switching to the VF mode, only one distributed power supply allowed to be switched to the VF mode is configured in the same region, and the distributed power supply with the largest regional content amount is generally selected.
Preferably, the power model method for each power supply to send its own real-time status to other power supplies stage by stage through the communication link is as follows:
each power grid-connected switch power distribution terminal acquires power supply running state information in real time, if the grid-connected switch is in a closed state, a power supply model in a real-time state is sent to the adjacent line switch power distribution terminal, and if the grid-connected switch is in a disconnected state, the power supply model is not sent; the real-time power model described here is a power model of each power source that is transmitted in accordance with its real-time operating state. The power model can reflect the running state of each power supply. And after the line switch power distribution terminal receives the power supply model of each power supply, if the line switch is in a closed state, the received power supply model type is sent to the adjacent power distribution terminal, and if the line switch is in a breaking state, the power supply model type is not sent.
In a specific embodiment, preferably, the method for detecting, by the DG in real time according to the received power model of each power source, reachability to other power sources in the system and determining an islanding state includes:
if a large power grid power supply or a distributed power supply operating in a VF mode exists in a power supply model of a real-time state received by the DG, judging that the DG operates in a grid-connected state; and if the DG does not receive any power supply operation state, or the received power supply model does not have a large power grid power supply and a distributed power supply operating in the VF mode, judging that the DG operates in the island state.
In order to further carry out coordination control on the DG operation mode according to the obtained island detection result, the reliability and flexibility of the operation of the active power distribution network are enhanced. The method for switching the operation modes comprises the following steps:
when the DG is changed from a grid-connected state to an island state, if the DG does not allow switching to the VF mode and the received power supply running state does not have the distributed power supply allowing switching to the VF mode, immediately stopping and disconnecting the grid-connected switch; if the DG allows to be switched to the VF mode, or the received power model has distributed power supplies allowing to be switched to the VF mode, after the VF mode is successfully switched, the system maintains the operation of an island state.
Fig. 2 is a system configuration diagram of the embodiment of the present invention. The system comprises two substations and three distributed power supplies, wherein DG2 is allowed to be switched to a VF mode for operation, the PCC 1-PCC 5 are power supply grid-connected point switches, and the F1-F14 are line switches. Pcc (point of Common coupling), which is a point of Common connection, is a connection point of more than one customer load in the power system. The power distribution terminals configured in the system realize the detection, control and communication functions of each switch, the adjacent switch power distribution terminals adopt General Object Oriented Substation Event (GOOSE) communication, and GOOSE information model input and output signals are configured based on a power supply model.
The first implementation mode comprises the following steps: when the system runs normally, the switch F4 is normally open, other switches are normally closed, and the system runs in an open loop mode. The active power distribution network island detection and coordination control method based on reachability query specifically comprises the following steps:
1) firstly, modeling is carried out based on information such as types, grid-connected states, operation modes, control strategies and the like of all power supplies in the system of the embodiment, and when the system operates normally, model information DG 1-DG 3 are respectively as follows: [ distributed power supply, grid-connected, PQ mode, no switching to VF mode ], and the model information of substation 1 and substation 2 are: [ large grid power supply, grid-connected, none ], [ large grid power supply, grid-connected, none ].
2) And secondly, establishing a communication link between each adjacent switch in the system, and gradually transmitting the self running state, namely the power supply model of the real-time state of each power supply from each power supply to other power supplies based on the power supply model information. The method comprises the steps that a grid-connected switch PCC1 power distribution terminal acquires transformer substation 1 power model information, wherein the transformer substation 1 power model information is [ large power grid power, grid-connected, none ], the PCC1 is in a closed state, and then the transformer substation 1 power model is sent to adjacent line switches F10 and F11 power distribution terminals; if the F10 power distribution terminal receives the substation 1 model and the F10 is in a closed state, the substation 1 model is sent to the adjacent switches PCC1, F7, F8, F9 and F11 power distribution terminals; if the F11 power distribution terminal receives the substation 1 model and the F11 is in a closed state, the substation 1 model is sent to the adjacent switch PCC1 and F10 power distribution terminals; if the F7 distribution terminal receives the substation 1 model and the F7 is in a closed state, the substation 1 model is sent to the adjacent switches F4, F5, F6, F8, F9 and F10 distribution terminals; if the F4 power distribution terminal receives the transformer substation 1 model and the F4 is in a breaking state, the model information is not sent to the adjacent switch power distribution terminal; and F5 and F6 power distribution terminals receive the substation 1 model and the switches are in a closed state, the substation 1 model is sent to PCC4, F4, F6, F7, PCC5, F4, F5 and F7 power distribution terminals respectively, and the PCC1, the PCC4 and the PCC5 power distribution terminals of the grid-connected point switch all receive substation 1 power model information.
By analogy, the information received by the PCC1, the PCC4 and the PCC5 includes power models of the substation 1, the DG2 and the DG3, which are respectively [ large grid power, grid-connected, none ], [ distributed power, grid-connected, PQ mode, switching to the VF mode is allowed ], [ distributed power, grid-connected, PQ mode, and switching to the VF mode is not allowed ]; the information received by the PCC2 and the PCC3 includes power models of the substation 2 and the DG1, which are [ large grid power, grid-connected, none ], [ distributed power, grid-connected, PQ mode, and is not allowed to be switched to VF mode ].
3) And thirdly, detecting the accessibility of the DG and other power supplies in the system in real time by the DG, and judging the island state. In this embodiment, the power supply information received by the PCC3, the PCC4, and the PCC5 includes a large grid power supply, and therefore it is determined that the DG1, the DG2, and the DG3 all operate in a grid-connected state;
when a fault occurs in the system K, the PCC1 and the F10 are switched from a closed state to an open state under the control of each switch power distribution terminal, so that effective fault isolation is realized, the power operation models of the power sources received by the PCC4 and the PCC5 only operate in a distributed power source in a PQ mode, and therefore, the DG2 and the DG3 are judged to operate in an island state; the power information received by the PCC3 still includes the large grid power, and therefore, it is determined that the DG1 is operating in a grid-connected state.
4) And further carrying out coordination control on the DG operation mode according to the obtained island detection result, and preferably, starting the coordination control to carry out operation mode switching when the obtained DG is changed from a grid-connected state to an island state. In this embodiment, when the DG2 and the DG3 determine that the grid-connected state is changed to the island state, the cooperative control is started to perform the operation mode switching. The DG2 model information control strategy is to allow switching to the VF mode, and the DG3 model information control strategy is not to allow switching to the VF mode, then the model switching operation of the DG2 is started, and after the DG2 is switched to the VF operation mode, the sub-system formed by the DG2, the DG3 in the PQ operation mode connected with the sub-system through the close switch and the local load maintains the islanding state operation.
The second embodiment: when the system operates normally, all the switches are normally closed, and the system operates in a closed loop mode. The active power distribution network island detection and coordination control method based on reachability query specifically comprises the following steps:
1) firstly, a power supply model is established based on information such as the type, grid-connected state, operation mode, control strategy and the like of each power supply in the system of the embodiment, and the specific process is the same as the step 1 of the embodiment and is not repeated;
2) and secondly, establishing a communication link between each adjacent switch in the system, and gradually transmitting a power model of the real-time state of each power supply to other power supplies based on the power model information. The transformer substation 1 power model information is acquired by a grid-connected point switch PCC1 power distribution terminal and is transmitted to F4, F5, F6, F7, F8, F9, F10, F11, PCC4 and PCC5 switch power distribution terminals step by step, and the specific process is the same as that of the corresponding part in step 2 of the first embodiment and is not described herein again; if the F4 power distribution terminal receives the transformer substation 1 model information and the F4 is in a closed state, the F4 power distribution terminal sends the model information to the adjacent switches F1, F2, F3, F5, F6 and F7 power distribution terminals; and F1 and F3 power distribution terminals receive the substation 1 model and the switches are in a closed state, the substation 1 model is respectively sent to PCC3, F2, F3, F4, PCC2, F1, F2, F4, F12 and F13 power distribution terminals, and the PCC 1-PCC 5 power distribution terminals of the grid-connected point switches receive the substation 1 power model information.
And so on, the PCCs 1 to 5 receive the power model information of all power sources in the system, including the substation 1, the substation 2, the DG1, the DG2 and the DG 3: [ large grid power supply, grid-connected, none ], [ distributed power supply, grid-connected, PQ mode, no switching to VF mode ].
3) And thirdly, detecting the accessibility of the DG and other power supplies in the system in real time by the DG, and judging the island state. In this embodiment, since the power supply information received by the PCCs 3 to 5 includes a large grid power supply, it is determined that the DG1, the DG2, and the DG3 all operate in a grid-connected state;
when a fault occurs in the system K, the PCC1 and the F10 are switched from a closed state to an open state under the control of each switch power distribution terminal, so that effective fault isolation is realized, the PCC 3-PCC 5 cannot receive power supply model information of the transformer substation 1, but still contain the power supply model information of the transformer substation 2, namely large-grid power supply information, therefore, the DG1, the DG2 and the DG3 are judged to be operated in a grid-connected state, and since no DG is detected to be switched from the grid-connected state to an island state, coordination control and mode switching operation cannot be started, and each DG keeps a PQ operation mode.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The island detection method for the active power distribution network is characterized by comprising the following steps:
establishing a power supply model based on the type, grid-connected state, operation mode and control strategy of each power supply in the active power distribution network;
establishing a communication link between each adjacent switch in the system;
each power supply sends a power supply model of the real-time state of the power supply to other power supplies step by step through a communication link;
the distributed power supply detects the accessibility of the distributed power supply with other power supplies in the system in real time according to the received power supply model and judges the island state to obtain an island detection result;
the method for transmitting the power supply model of the real-time state of each power supply to other power supplies step by step through the communication link comprises the following steps:
each power grid-connected switch power distribution terminal acquires power supply running state information in real time, if the grid-connected switch is in a closed state, a power supply model in a real-time state is sent to the adjacent line switch power distribution terminal, and if the grid-connected switch is in a disconnected state, the power supply model is not sent; and after the line switch power distribution terminal receives the power supply models of the power supplies, if the line switch is in a closed state, the received power supply models of the power supplies are sent to the adjacent power distribution terminal, and if the line switch is in a breaking state, the power supply models of the power supplies are not sent.
2. The active power distribution network island detection method according to claim 1,
the types of the power supply comprise a large power grid power supply and a distributed power supply;
the grid connection state comprises grid connection and grid disconnection;
the operating mode is only active for distributed power, including operating in a voltage-frequency mode and operating in an active-reactive mode;
the control strategy is only effective for the distributed power supply, and comprises allowing to switch to a VF mode and not allowing to switch to the VF mode; only one distributed power supply that allows switching to the VF mode is configured in the same area.
3. The active power distribution network island detection method according to claim 2, wherein the distributed power supply with the largest regional content is configured to allow switching to the VF mode.
4. The active power distribution network island detection method of claim 1, wherein a communication link between adjacent switches in the system is established between power distribution terminals of adjacent switches by adopting general object-oriented substation event communication, and input and output signals of substation events are configured based on the power model.
5. The active power distribution network island detection method of claim 1, wherein the method for the distributed power supply to detect accessibility of the distributed power supply to other power supplies in the system in real time according to the received power supply model and to judge an island state to obtain an island detection result comprises the following steps:
if the distributed power source received by the distributed power source has a large power grid power source or a distributed power source operating in a VF mode, judging that the distributed power source operates in a grid-connected state; and if the distributed power supply does not receive any power supply model of the power supply, or the received power supply model does not have a large power grid power supply and the distributed power supply operating in the VF mode, judging that the distributed power supply operates in an island state.
6. The active power distribution network island detection method according to claim 1, further comprising the following steps after obtaining an island detection result: and if the distributed power supply judges that the grid-connected state is changed into the island state, starting the coordinated control to switch the operation mode.
7. The active power distribution network island detection method according to claim 6, wherein the method for switching the operation modes comprises the following steps:
when the grid-connected state of the distributed power supply is changed into an island state, if the distributed power supply does not allow switching to the VF mode and the received power supply model does not have the distributed power supply allowing switching to the VF mode, immediately stopping and disconnecting the grid-connected switch; if the distributed power supply allows to be switched to the VF mode, or the received power supply model contains the distributed power supply which allows to be switched to the VF mode, after the VF mode is successfully switched, the system maintains the operation of an island state.
8. The active power distribution network island detection system is characterized by comprising a power supply information model establishing module, a communication link establishing module, a power supply model sending module and an island state judging module;
the power supply information model establishing module is used for establishing a power supply model based on each power supply type, grid-connected state, operation mode and control strategy in the active power distribution network;
the communication link establishing module is used for establishing communication links between adjacent switches in the system;
the power supply model sending module is used for sending the power supply model of the real-time state of each power supply to other power supplies step by step through a communication link; the method for transmitting the power model of the real-time state of each power supply to other power supplies step by step through the communication link comprises the following steps:
each power grid-connected switch power distribution terminal acquires power supply running state information in real time, if the grid-connected switch is in a closed state, a power supply model in a real-time state is sent to the adjacent line switch power distribution terminal, and if the grid-connected switch is in a disconnected state, the power supply model is not sent; after the line switch power distribution terminal receives the power supply models of the power supplies, if the line switch is in a closed state, the received power supply models of the power supplies are sent to the adjacent power distribution terminal, and if the line switch is in a breaking state, the power supply models of the power supplies are not sent;
and the island state judgment module is used for detecting the accessibility of the distributed power supply with other power supplies in the system in real time according to the received power supply model and judging the island state to obtain an island detection result.
9. The active power distribution network island detection system of claim 8, further comprising an operation mode switching module, wherein the operation mode switching module is configured to start coordinated control to perform operation mode switching if the distributed power supply determines that the distributed power supply is changed from a grid-connected state to an island state.
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| CN201811588198.4A CN109659975B (en) | 2018-12-25 | 2018-12-25 | Island detection method and system for active power distribution network |
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