CN114069624A - Power grid fault recovery system and method - Google Patents
Power grid fault recovery system and method Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 7
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a power grid fault recovery system and a power grid fault recovery method, wherein the power grid fault recovery system comprises a real-time monitoring module, a fault diagnosis module and a fault recovery analysis module, wherein the real-time monitoring module is used for receiving a fault diagnosis result of a power grid and generating a fault recovery analysis signal; the power failure range analysis module is used for reading the real-time section data of the power grid and obtaining a power failure range result according to the real-time section data of the power grid; the power supply point searching module is used for searching available power supply points outside the power failure range result area to obtain available power supply point results; the scheme analysis module is used for acquiring loss load caused by power failure equipment failure; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; and the scheme evaluation module is used for evaluating the recovery scheme and the corresponding feasibility index according to the recovery scheme and outputting the final recovery scheme. The invention generates a power supply recovery scheme aiming at the power failure area, and performs safety check by combining with static safety analysis, thereby realizing the rapid generation of the fault recovery scheme.
Description
Technical Field
The invention relates to the technical field of power grid fault recovery, in particular to a power grid fault recovery system and a power grid fault recovery method.
Background
The power failure of some loads, including some important loads, often inevitably occurs after the power grid failure, and how to search other available power supply restoration paths for the power failure loads to quickly restore the power supply is a problem often encountered in the work of dispatching personnel, namely, a problem of power supply path search.
The power supply path search means that when a power grid fails, under the condition that allowable operation conditions and electrical constraint conditions are met, available power supply search is carried out on loads which are powered off due to power grid failure, a series of switch operation sequences capable of recovering load power supply are further provided, and each device of the power grid is required to be in a long-term safe operation state. The main goal of the power supply path search is to obtain a reasonably safe power supply restoration path for the load at power outage, and to restore as many load at power outage as possible with as few switching operations as possible.
With the gradual expansion of regional power grids, when a dispatcher searches a power supply path for a power failure load, the power supply path obtained by observation and experience is inevitable to have omission and negligence, so that a power supply path searching program is required to automatically analyze and judge after the load power failure caused by the power grid failure, all possible power supply recovery paths are provided for the load capable of recovering power supply, the quality of each power supply path is evaluated, and an auxiliary decision making function is provided for the dispatcher.
Disclosure of Invention
The invention aims to provide a power grid fault recovery system and a power grid fault recovery method, which can automatically analyze and judge after load power failure caused by power grid faults, provide all possible power supply recovery paths for loads capable of recovering power supply, and evaluate the quality of each power supply path.
In one aspect, a grid fault recovery system is provided, including:
the real-time monitoring module is used for receiving a fault diagnosis result of the power grid and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm;
the power failure range analysis module is used for responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result;
the power supply point searching module is used for searching available power supply points outside the power failure range result area to obtain available power supply point results;
the scheme analysis module is used for acquiring loss load caused by power failure equipment failure; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point;
and the scheme evaluation module is used for evaluating the load rate index of the power transfer path according to the power transfer station and the power transfer branch of the power point in the available power point result by a preset evaluation algorithm according to the recovery scheme, outputting the load rate index as a feasibility index corresponding to the recovery scheme to obtain the recovery scheme and the corresponding feasibility index, and outputting the feasibility index as a final recovery scheme.
Preferably, the scheme analysis module is further configured to determine whether a communication path exists for transferring power from a preset main network to the power outage range when searching for a power supply path according to the available power supply point result; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme;
when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information.
Preferably, the power grid real-time section data at least comprises primary equipment model data, spare power automatic switching model data, remote signaling data, remote measuring data, equipment parameter data and connection relation data.
Preferably, the power failure range analysis module is further configured to establish an initial section of the fault recovery analysis according to the real-time section data of the power grid;
after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section;
starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic;
writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result.
Preferably, the power supply point searching module is further configured to search for a hot standby switch on the search path from the power outage device as a starting point, and if the hot standby switch is found, calculate, according to the device parameter, a load rate of a device connected after the hot standby switch is put into operation through a preset power flow calculation model;
and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point.
Preferably, the scheme analysis module is further configured to search for a power-off station affected by the fault, perform topology search through a preset search algorithm from a fault device endpoint, and determine all devices on a search path as power-off devices without passing through disconnected switches and live devices during the search; and counting the loss load information of the power loss station and each power loss station.
On the other hand, a grid fault recovery method is also provided, which is implemented by the grid fault recovery method, and comprises the following steps:
receiving a fault diagnosis result of a power grid, and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm;
responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result;
searching available power supply points outside the power failure range result area to obtain available power supply point results;
acquiring a loss load caused by a power failure equipment fault; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point;
and according to the recovery scheme, outputting the load rate index as a feasibility index corresponding to the recovery scheme according to the load rate index of the power supply transfer station and the power supply transfer branch evaluation transfer path of the power supply point in the available power supply point result by a preset evaluation algorithm, obtaining the recovery scheme and the corresponding feasibility index, and outputting the recovery scheme and the corresponding feasibility index as a final recovery scheme.
Preferably, the obtaining of the power outage range result specifically includes:
establishing an initial section for fault recovery analysis according to the real-time section data of the power grid;
after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section;
starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic;
writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result.
Preferably, the searching for the available power supply point outside the power outage range result area specifically includes:
searching a hot standby switch on the search path from the power failure equipment as a starting point, and if the hot standby switch is searched, calculating the load rate of the connected equipment after the hot standby switch is put into operation according to equipment parameters through a preset load flow calculation model;
and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point.
Preferably, the output recovery scheme specifically includes:
when a power supply path is searched according to the available power supply point result, whether a communication path exists or not is judged, wherein the communication path exists when power is transferred from a preset main network to the power failure range; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme;
when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information.
In summary, the embodiment of the invention has the following beneficial effects:
the power grid fault recovery system and the power grid fault recovery method provided by the invention have the advantages that fault equipment information is obtained from a fault diagnosis system, a power failure station and equipment are analyzed by monitoring and starting a power failure range analysis module in real time, power supply point search is started under the condition that a new power failure range appears, standby power supply points capable of being transferred are searched, a power loss recovery scheme and operation steps are generated through intelligent analysis, and meanwhile, the operation steps of power loss recovery can be given out by utilizing a load rate index of a topological power flow analysis recovery scheme.
The fault recovery scheme analysis is driven by fault alarm information, the action condition of the backup power source automatic switching is monitored and analyzed by combining a backup power source automatic switching model, and the out-of-limit equipment and power failure information after the fault is analyzed; aiming at the power failure area, a power supply recovery scheme is automatically generated by adopting a layered and partitioned load transfer method, safety check is carried out by combining static safety analysis, the checked recovery scheme is decomposed into a switch action sequence, and the on-line rapid generation of a fault recovery scheme is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a power grid fault recovery system according to an embodiment of the present invention.
Fig. 2 is a schematic main flow chart of a method for recovering a grid fault in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of a grid fault recovery system according to the present invention. In this embodiment, the method includes:
the real-time monitoring module is used for receiving a fault diagnosis result of the power grid and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm; that is, the system monitors the fault diagnosis result at present, utilizes the message mode to exchange information, and automatically starts fault recovery analysis under the condition of receiving fault alarm.
The power failure range analysis module is used for responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result; namely, the real-time power grid section is read, and the power failure range influenced by the fault is searched by taking fault equipment as a target, wherein the power failure range comprises a power failure station, power failure equipment and a loss load.
In a specific embodiment, the power failure range analysis module is further configured to establish an initial section of fault recovery analysis according to the real-time section data of the power grid; after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section; starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic; writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result. Namely, establishing an initial section of fault recovery analysis; after the fault equipment information is received, updating the switch trip information of the fault equipment, starting the analysis of the spare power automatic switching action on the section after the trip switch action, scanning a whole network bus, judging whether the voltage is lost or not through the bus measurement information, and judging the condition of the spare power automatic switching action by combining a spare power automatic switching model and action logic in an EMS system if the voltage is lost, so as to obtain the switch action information connected with the voltage-lost bus; meanwhile, the operation information (namely the switching state) of the spare power automatic switching device can be written into the analysis section.
The power supply point searching module is used for searching available power supply points outside the power failure range result area to obtain available power supply point results; that is, the available power supply points at the periphery of the area are automatically searched according to the obtained power failure range result.
In a specific embodiment, the power supply point searching module is further configured to search for a hot standby switch on the search path from a power outage device as a starting point, and if the hot standby switch is found, calculate, according to device parameters, a load rate of a device connected after the hot standby switch is put into operation through a preset power flow calculation model; and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point. Namely, starting power failure range analysis on the basis of a fault section, namely, starting from a fault equipment node and combining with the power flow direction of a power grid, searching a power failure area by adopting a breadth-first search algorithm, and marking equipment on a search access; if a power failure area is judged in the process, namely power failure equipment is searched, load transfer analysis is started, a breadth-first search algorithm is adopted from the power failure load to search a hot standby switch on a search path (after the hot standby switch is found, the search on the path is stopped), a standby power supply point (hot standby switch) of the power failure area to which the load belongs is obtained, the load rate of the equipment connected after the hot standby switch is put into operation is analyzed through load flow calculation and equipment parameters, and if the equipment is out of limit, the standby power supply point is removed.
The scheme analysis module is used for acquiring loss load caused by power failure equipment failure; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point; namely, combining a power supply point and a loss load, searching a power supply path, marking an operable switch sequence, adjusting an operation mode and providing an operation step of a recovery scheme.
In a specific embodiment, the scheme analysis module is further configured to search for a power-off station affected by a fault, perform topology search through a preset search algorithm from a fault device endpoint, and determine all devices on a search path as power-off devices without passing through disconnected switches and live devices during the search; and counting the loss load information of the power loss station and each power loss station. That is, starting from a fault equipment end point (terminal equipment such as load and the like is an end point), topology searching is started by adopting a breadth-first searching algorithm, all equipment on a searching path is power-off equipment without passing through a disconnected switch and electrified equipment in the searching process, and loss load information of the power-off plant station and each power-off plant station is counted on the basis. And sorting the power-losing stations according to the priority, wherein the sorting strategy comprises the loss load size, the station importance degree and the like, and the recovery sequence can be manually modified.
Specifically, the scheme analysis module is further configured to determine whether a communication path exists for transferring power from a preset main network to the power outage range when searching for a power supply path according to the available power supply point result; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme; when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information. Namely, a power failure area is obtained firstly, then a main network recovery strategy is started to calculate and preferentially consider the transfer from the main network to the power supply, then the substation and the branch bus are sequentially transferred from high to low based on the voltage level of the power failure area, and meanwhile, the principles of high voltage level priority, important user priority and loss load priority are considered.
And the scheme evaluation module is used for evaluating the load rate index of the power transfer path according to the power transfer station and the power transfer branch of the power point in the available power point result by a preset evaluation algorithm according to the recovery scheme, outputting the load rate index as a feasibility index corresponding to the recovery scheme to obtain the recovery scheme and the corresponding feasibility index, and outputting the feasibility index as a final recovery scheme. Namely, according to different operation steps, a power supply station and a power supply branch of a power supply point are analyzed, a load rate index of a power supply path is analyzed by using topological power flow, the feasibility of a scheme is considered, and finally, operation steps and evaluation information of the scheme are given. Specifically, whether a power-loss station exists is judged, and if not, recovery is completed; and if so, the power-losing stations after cyclic sequencing respectively count the power-losing buses of the stations, circulate the bus equipment in the power grid model, acquire the buses in the stations, and judge whether the buses search the obtained power-losing equipment. And sequencing the power-losing buses in the station according to the voltage grades, wherein the bus with the high voltage grade has high recovery priority. Starting from the bus equipment end point, the standby power supply point of the bus is searched. Setting the bus as a root node, searching for a connecting switch around the bus by adopting breadth-first search, judging whether the opposite side node of the switch is electrified or not if the switch is in a branch state, and judging that the switch is powered by a standby power supply if the opposite side node of the switch is electrified. And if the standby power supply point is put into operation, analyzing whether the station has a voltage-loss bus, if not, successfully recovering the station to obtain a recovery strategy of the station, and repeating the process until all stations are completely recovered. Meanwhile, the searched hot standby switch can be converted into operation, and static risk scanning is carried out on the converted power grid on the updated power grid section by utilizing a static safety analysis function, so that the safe and stable operation of the power grid is ensured; and decomposing the supply transfer scheme into a switching action sequence to generate an operation scheme for assisting the fault recovery of the dispatching operator. And finally, evaluating the feasibility of the recovery scheme by adopting load flow calculation and static security analysis.
Fig. 2 is a schematic diagram of an embodiment of a grid fault recovery system according to the present invention. In this embodiment, the method comprises the steps of:
and receiving a fault diagnosis result of the power grid, and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm.
And further, responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by the fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result.
Specifically, establishing an initial section of fault recovery analysis according to the real-time section data of the power grid;
after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section;
starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic;
writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result.
Further, available power supply points outside the power failure range result area are searched to obtain available power supply point results.
Specifically, a hot standby switch on the search path is searched from the power failure equipment as a starting point, and if the hot standby switch is searched, the load rate of the connected equipment after the hot standby switch is put into operation is calculated according to equipment parameters through a preset power flow calculation model;
and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point.
Further, acquiring a loss load caused by the failure of the power failure equipment; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point.
Specifically, when a power supply path is searched according to the available power supply point result, whether a communication path exists in power supply transfer from a preset main network to the power failure range is judged; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme;
when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information.
Further, according to the recovery scheme, a preset evaluation algorithm is used for evaluating load rate indexes of a power supply transfer path according to the power supply transfer station and the power supply transfer branch of the power supply point in the available power supply point result, the load rate indexes are output as feasibility indexes corresponding to the recovery scheme, the recovery scheme and the corresponding feasibility indexes are obtained, and the final recovery scheme is output.
For the specific implementation process of the power grid fault recovery system, specific contents of the power grid fault recovery method may be referred to, and details are not described herein.
In summary, the embodiment of the invention has the following beneficial effects:
the power grid fault recovery system and the power grid fault recovery method provided by the invention have the advantages that fault equipment information is obtained from a fault diagnosis system, a power failure station and equipment are analyzed by monitoring and starting a power failure range analysis module in real time, power supply point search is started under the condition that a new power failure range appears, standby power supply points capable of being transferred are searched, a power loss recovery scheme and operation steps are generated through intelligent analysis, and meanwhile, the operation steps of power loss recovery can be given out by utilizing a load rate index of a topological power flow analysis recovery scheme.
The fault recovery scheme analysis is driven by fault alarm information, the action condition of the backup power source automatic switching is monitored and analyzed by combining a backup power source automatic switching model, and the out-of-limit equipment and power failure information after the fault is analyzed; aiming at the power failure area, a power supply recovery scheme is automatically generated by adopting a layered and partitioned load transfer method, safety check is carried out by combining static safety analysis, the checked recovery scheme is decomposed into a switch action sequence, and the on-line rapid generation of a fault recovery scheme is realized.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A grid fault recovery system, comprising:
the real-time monitoring module is used for receiving a fault diagnosis result of the power grid and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm;
the power failure range analysis module is used for responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result;
the power supply point searching module is used for searching available power supply points outside the power failure range result area to obtain available power supply point results;
the scheme analysis module is used for acquiring loss load caused by power failure equipment failure; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point;
and the scheme evaluation module is used for evaluating the load rate index of the power transfer path according to the power transfer station and the power transfer branch of the power point in the available power point result by a preset evaluation algorithm according to the recovery scheme, outputting the load rate index as a feasibility index corresponding to the recovery scheme to obtain the recovery scheme and the corresponding feasibility index, and outputting the feasibility index as a final recovery scheme.
2. The system of claim 1, wherein the scenario analysis module is further configured to determine whether a communication path exists for transferring power from a preset main network to the blackout area when searching for a power supply path according to the result of the available power point; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme;
when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information.
3. The system of claim 1, wherein the grid real-time profile data comprises at least primary equipment model data, backup automatic switching model data, remote signaling data, telemetry data, equipment parameter data, and connection relationship data.
4. The system of claim 3, wherein the blackout range analysis module is further configured to establish an initial profile for fault recovery analysis based on the real-time profile data of the power grid;
after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section;
starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic;
writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result.
5. The system of claim 4, wherein the power point searching module is further configured to search for a hot standby switch on the search path from a blackout device as a starting point, and if the hot standby switch is found, calculate, according to device parameters, a load factor of a connected device after the hot standby switch is put into operation through a preset power flow calculation model;
and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point.
6. The system of claim 5, wherein the scenario analysis module is further configured to search for a power-off station affected by a fault, perform topology search from a fault device endpoint through a preset search algorithm, and determine all devices on a search path as power-off devices without passing through disconnected switches and live devices during the search; and counting the loss load information of the power loss station and each power loss station.
7. A grid fault recovery method implemented by the method of any one of claims 1-6, comprising:
receiving a fault diagnosis result of a power grid, and generating a fault recovery analysis signal when the fault diagnosis result of the power grid comprises a fault alarm;
responding to the received fault recovery analysis signal, reading power grid real-time section data, and searching a power failure range influenced by fault equipment in the power grid real-time section data by taking the fault equipment as a target to obtain a power failure range result;
searching available power supply points outside the power failure range result area to obtain available power supply point results;
acquiring a loss load caused by a power failure equipment fault; searching a power supply path according to the available power supply point result, marking an operable switch sequence in the power supply path, and outputting a recovery scheme; wherein the power supply path takes an available power supply point in the available power supply point result as a starting point and takes the power failure range result as an end point;
and according to the recovery scheme, outputting the load rate index as a feasibility index corresponding to the recovery scheme according to the load rate index of the power supply transfer station and the power supply transfer branch evaluation transfer path of the power supply point in the available power supply point result by a preset evaluation algorithm, obtaining the recovery scheme and the corresponding feasibility index, and outputting the recovery scheme and the corresponding feasibility index as a final recovery scheme.
8. The method of claim 7, wherein said obtaining a blackout range result specifically comprises:
establishing an initial section for fault recovery analysis according to the real-time section data of the power grid;
after receiving the fault recovery analysis signal, acquiring fault equipment information, and updating switch trip information in the fault equipment information into the initial section to generate a fault section;
starting the analysis of the spare power automatic switching action on the fault section according to a preset spare power automatic switching model, scanning a whole-network bus and judging whether the bus is in voltage loss or not according to bus measurement information, and if the bus is in voltage loss, obtaining the action information of a spare power automatic switching switch connected with the voltage loss bus according to the spare power automatic switching model and preset action logic;
writing the action information of the spare power automatic switching switch into a fault section, searching the fault section according to a preset search algorithm and marking equipment on a search path; and if the power failure equipment is searched, outputting the area influenced by the power failure equipment as a power failure range result.
9. The method of claim 8, wherein said searching for available power supply points outside of said blackout area result region specifically comprises:
searching a hot standby switch on the search path from the power failure equipment as a starting point, and if the hot standby switch is searched, calculating the load rate of the connected equipment after the hot standby switch is put into operation according to equipment parameters through a preset load flow calculation model;
and comparing the load rate obtained by calculation with a preset safety threshold, if the load rate exceeds the safety threshold, excluding the standby power supply point, and if the load rate does not exceed the safety threshold, taking the standby power supply point as an available power supply point.
10. The method of claim 9, wherein the outputting the recovery scheme specifically comprises:
when a power supply path is searched according to the available power supply point result, whether a communication path exists or not is judged, wherein the communication path exists when power is transferred from a preset main network to the power failure range; when the communication path exists, outputting the communication path for transferring power from a preset main network to the power failure range as a recovery scheme;
when the communication path does not exist, judging whether a power transfer path exists in the substation and the branch bus which are connected with the power failure range according to the sequence of the voltage grades from high to low; if the power transfer path exists, outputting the power transfer path as a recovery scheme and sequencing according to the priority of the high voltage class, the priority of the important user and the priority of the loss load; and if the transfer power path does not exist, generating non-recovery scheme information.
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