CN111952972A - Main distribution integrated load transfer method for high-quality power supply service - Google Patents
Main distribution integrated load transfer method for high-quality power supply service Download PDFInfo
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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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- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/18—Systems supporting electrical power generation, transmission or distribution using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
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Abstract
A main distribution integrated load transfer method for high-quality power supply service comprises the following steps: (1) determining fault equipment and power loss load: determining fault equipment through a fault alarm function of the comprehensive intelligent alarm application of the main station end, and calling an auxiliary decision to determine a power loss load; (2) searching a main power supply path and generating a candidate scheme; (3) main and auxiliary integrated power flow verification and optimal path determination schemes: determining an optimal path scheme based on the candidate scheme flow safety check of the main distribution integrated operation data; (4) determining a main distribution integrated load transfer operation sequence facing a high-quality power supply service; (5) and calling an adaptive correction processing strategy when the switch operation is obstructed. By utilizing the method and the device, the problem that the main distribution network accident recovery and the distribution network accident recovery are mutually independent, so that the cooperative quick recovery cannot be realized under the large-scale power failure accident can be solved, and the main distribution integrated whole-network quick load transfer under the power grid fault can be realized.
Description
Technical Field
The invention relates to an automatic generation method of a load transfer scheme, in particular to a main distribution integrated load transfer method for high-quality power supply service.
Background
Along with the increasing of the conditions of overload, out-of-limit, fault, maintenance, operation mode change and the like of daily operation of regional power grids, the requirements of users on power supply quality and power supply reliability are higher and higher.
When the power grid fails, an emergency strategy of load recovery is given in time, further development of power grid accidents can be effectively controlled, the time for recovering normal operation of the power grid is shortened, and loss caused by the power grid accidents is reduced. On the other hand, the processing plan under the accident condition can be simulated by adopting the modes of accident prediction, simulation calculation and the like, decision basis and means for preventing the accident are provided for an emergency processing system, and the capability of resisting the power grid accident disaster is improved.
Under the condition that a power grid fails, a dispatcher needs to quickly master the load loss condition of the system so as to effectively perform recovery disposal after the failure. The existing main network control system can automatically position fault equipment and provide information such as power failure range and the like caused by faults under the condition of power grid faults, but the quantity of users and the power supply level of the users affected by the faults cannot be subdivided due to lack of related information of a power distribution network, the influence degree of the faults is difficult to evaluate in time, and the rapid transfer of the load of the whole network which is prioritized by important users is difficult to realize.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a load transfer method capable of realizing the cooperative and rapid recovery of a main network and a distribution network and the integration of the main network and the distribution network under the condition of power grid failure.
The invention solves the technical problem by adopting the technical scheme that a main distribution integrated load transfer method for high-quality power supply service comprises the following steps:
(1) determining fault equipment and power loss load: determining fault equipment through a fault alarm function of the comprehensive intelligent alarm application of the main station end, and calling an auxiliary decision to determine a power loss load;
(2) searching a main power supply path and generating a candidate scheme;
(3) main and auxiliary integrated power flow verification and optimal path determination schemes: determining an optimal path scheme based on the candidate scheme flow safety check of the main distribution integrated operation data;
(4) determining a main distribution integrated load transfer operation sequence facing a high-quality power supply service;
(5) and calling an adaptive correction processing strategy when the switch operation is obstructed.
Further, the specific method of the step (1) is as follows:
(1-1) uploading switch deflection, protection action and equipment out-of-limit signals to a dispatching end background system by an SCADA (supervisory control and data acquisition) system, and determining fault equipment according to fault diagnosis logic by comprehensive intelligent alarm;
(1-2) after the faulty equipment is determined, dyeing the network topology into a plurality of color blocks with different colors by using a dynamic network topology analysis method according to the power supply condition of the equipment, wherein the color block color is determined by an electric topology island to which a 220kV high-voltage side switch belongs, and when the state of the breaker is closed and a bus above the breaker is electrified, the color block represents a power supply area; when the state of the breaker is divided and is a fault trip switch, the color block represents a fault power loss area.
Further, the specific method of the step (2) is as follows:
(2-1) firstly, adding a pulse signal with a set height to the opposite end of a boundary point switch of a power failure area, carrying out broadcast transmission on the pulse signal by combining a local topology and breadth priority technology, recording all relevant switches and feeder equipment infected by the broadcast signal and the sensing direction of the switches and the feeder equipment when the switches and the feeder equipment receive the broadcast signal, stopping the broadcast signal in the branch direction when the broadcast signal touches the boundary equipment of a power supply coloring area, and simultaneously recording the position of a reflection point; starting the transmission of the reflection point signal after the signal transmission of the transmission point is finished, wherein the principle is the same as the signal transmission of the transmission point; all the devices with different sensing directions in the positive and negative signal broadcasting processes are associated devices in an operation path, the devices with the same sensing direction are non-path devices, and the transmission sequence of the reflection point signals of the associated devices in the operation path is consistent with the corresponding actual field operation sequence;
(2-2) sequentially generating a plurality of transfer strategies for load transfer power supply when a plurality of potential secondary power supply sources exist in the load of the transfer area;
and (2-3) obtaining a candidate scheme of large-range load safety transfer under the power supply side fault including bus voltage loss and main transformer fault according to the topology search algorithm aiming at finding the critical path.
Further, the specific method of the step (3) is as follows:
(3-1) adopting a main distribution cooperative power flow calculation method for main distribution integrated power flow calculation, establishing a calculation coordination control center in a main distribution system based on main distribution unified modeling by using the main distribution cooperative power flow calculation method, taking boundary node voltage and a power distribution network equivalent model as coordination variables, and respectively calling power transmission network power flow calculation and power distribution network power flow calculation functions by using a calculation idea of asynchronous iteration;
(3-2) the power transmission network load flow calculation is realized on the basis of the load flow calculation function of the current dispatcher load flow module by adopting a PQ decomposition method or a Newton-Raphson method;
(3-3) due to the special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of a Newton method cannot be met, and therefore the power flow calculation of the power distribution network is calculated by the Newton-Raphson method;
and (3-4) performing iterative correction of boundary load and node voltage according to the boundary information, finally realizing the unified power flow of the whole network, obtaining the power flow distribution and the power grid state which are consistent with those of the main network and the distribution network, determining an optimal load transfer path, and identifying switches to be closed and switches to be separated.
Further, the specific method in step (4) is as follows:
(4-1) respectively placing switches to be switched on and switches to be switched off into queues QH and QF, taking a VH of a switch to be switched on out of the QH, searching areas with power supply points, switching off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, forming an operation group by the searched switches to be switched off and the VH, if only switches to be switched on exist in the operation group, calling the switch to be switched on as a class 1 operation group, and placing the switch to be switched off into an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance, putting a tie switch related to a first-level load transfer circuit to the head ends of execution queues G1 and G2 to be switched on, putting the tie switch related to the second-level load to the rear end of the execution queues without related to a second-level load, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop trend analysis is needed to be carried out firstly, if closing loop is not allowed, a principle of first breaking and then closing is needed in the operation process so as to avoid overload or closed loop risks, and in order to accelerate recovery speed and reduce power failure influence, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; for the situation that the loop closing is not allowed, the sequence of the switches to be operated in the operation group is arranged according to the principle of switching off firstly and then switching on secondly; the method is characterized in that the method follows the principle of sequencing a power failure area and a charged area for the condition that a plurality of switches to be switched off are arranged, and sequences the power failure loss of the switches to be switched off from small to large for the condition that the switches to be switched off are arranged in the power failure area or the charged area. And (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
Further, the specific method of step (5) is as follows:
and after the step of remote control operation of the switches in the power supply recovery process is generated, the corresponding switches are remotely controlled. If the switch which fails to be remotely controlled does not exist, the operation is executed in sequence; when a certain switch is failed to be remotely controlled, the remote control operation can be tried again, and if the remote control operation is successful, the subsequent remote control operation can be executed according to the established switch remote control operation steps in the power supply recovery process;
and (3) if the remote control is invalid and the power supply of the region is not recovered, identifying the switch which fails to be remotely controlled and has been successfully remotely controlled, discharging the switch from the solution space, and returning to the step (2) to regenerate a new switch remote control operation step.
By utilizing the method and the system, the problem that the accident recovery of the main network and the distribution network is mutually independent, the cooperative quick recovery under the large-scale power failure accident is realized, and the main-distribution integrated whole-network quick load transfer under the power grid fault is realized.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the present embodiment includes the following steps: determining fault equipment and power loss load: the main station terminal synthesizes a fault alarm function of the intelligent alarm application to determine fault equipment, and calls an auxiliary decision to determine a power loss load;
(2) searching a main power supply path and generating a candidate scheme;
(3) main and auxiliary integrated power flow verification and optimal path determination schemes: performing flow safety check on a candidate scheme based on main distribution integrated operation data, and determining an optimal path scheme;
(4) determining a main distribution integrated load transfer operation sequence facing a high-quality power supply service;
(5) in the execution process, if a switch which fails to be remotely controlled exists, the self-adaptive correction processing strategy is adopted, namely, the step (2) is returned; otherwise, the execution process is ended.
In the step (1), the main station end synthesizes the fault alarm function of the intelligent alarm application to determine the fault equipment, and the steps of calling an auxiliary decision to determine the power-loss load are as follows:
and (1-1) the SCADA (supervisory control and data acquisition) system uploads signals of switch deflection, protection action, equipment out-of-limit and the like to a background system of a dispatching end, and the comprehensive intelligent alarm determines fault equipment according to fault diagnosis logic.
(1-2) after the faulty equipment is determined, dyeing the network topology into a plurality of color blocks with different colors by using a dynamic network topology analysis method according to the power supply condition of the equipment, wherein the color block color is determined by an electric topology island to which a 220kV high-voltage side switch belongs, and when the state of the breaker is closed and a bus above the breaker is electrified, the color block represents a power supply area; and when the state of the breaker is divided and is a fault trip switch, the color block represents a fault power-loss area.
In the step (2), the step of searching the main matching body power supply path and generating the candidate scheme is as follows:
(2-1) after the system is divided by color blocks, the power failure area fault recovery method is changed into a process of searching power supply color blocks from the power failure color blocks, firstly, a pulse signal with a set height is added to the opposite end of a boundary point switch of the power failure area, the broadcasting transmission of the pulse signal is carried out by combining the local topology and the breadth priority technology, all devices such as switches, feeders and the like infected by the broadcasting signal and the sensing direction of the devices when the devices receive the broadcasting signal are recorded, when the broadcasting signal touches the boundary device of the power supply coloring area, the broadcasting signal in the branch direction stops propagating, and meanwhile, the position of a reflection point is recorded. And starting the propagation of the signal of the reflection point after the signal of the transmission point is propagated, wherein the principle is the same as the propagation of the signal of the transmission point. All the devices with different sensing directions in the positive and negative signal broadcasting processes are associated devices in an operation path, the devices with the same sensing direction are non-path devices, and the transmission sequence of the reflection point signals of the associated devices in the operation path is consistent with the corresponding actual field operation sequence;
(2-2) when the load in the transfer area has a plurality of potential secondary power supply sources, sequentially generating a plurality of transfer strategies aiming at load transfer power supply;
and (2-3) according to the topology searching algorithm aiming at finding the critical path, a candidate scheme of large-range load safety transfer under the power supply side faults such as bus voltage loss, main transformer faults and the like can be obtained.
In the step (3), the step of determining the optimal path scheme based on the candidate scheme flow check of the main distribution integration operation data comprises the following steps:
(3-1) adopting a main distribution cooperative power flow calculation method for main distribution integrated power flow calculation, establishing a calculation coordination control center in a main distribution system based on main distribution unified modeling by using the main distribution cooperative power flow calculation method, taking boundary node voltage and a power distribution network equivalent model as coordination variables, and respectively calling power transmission network power flow calculation and power distribution network power flow calculation functions by using a calculation idea of asynchronous iteration;
(3-2) the power transmission network load flow calculation is realized on the basis of the load flow calculation function of the current dispatcher load flow module, and can be realized by adopting a PQ decomposition method or a Newton-Raphson method;
(3-3) due to the special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of a Newton method cannot be met, and therefore the power flow calculation of the power distribution network is calculated by the Newton-Raphson method;
and (3-4) performing iterative correction of boundary load and node voltage according to the boundary information, and finally realizing the unified power flow of the whole network to obtain the power flow distribution and the power grid state which are consistent with those of the main network and the distribution network. And determining an optimal load transfer path, and identifying switches to be closed and opened.
In the step (4), the step of determining the load transfer operation sequence of the main and auxiliary integration body facing the high-quality power supply service is as follows:
(4-1) respectively putting the switch to be switched on and the switch to be switched off into the queues QH and QF, taking out a VH of the switch to be switched on from the QH, searching areas with power supply points, switch off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, and forming an operation group by the searched switch to be switched off and the VH. If only the switch to be switched on exists in the operation group, the operation group is called a class 1 operation group and is placed in an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance. And (3) putting the interconnection switch related to the primary load transfer line to the head end of the execution queue (G1, G2) to be switched on, and putting the interconnection switch related to the secondary load to the back end of the execution queue without the secondary load. Generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop power flow analysis needs to be carried out firstly, and if the closing loop is not allowed, a principle of first breaking and then closing needs to be adopted in the operation process so as to avoid the risk of overload or closing loop. In order to accelerate the recovery speed and reduce the influence of power failure, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; and for the situation that the loop closing is not allowed, arranging the sequence of the switches to be operated in the operation group according to the principle of switching off firstly and then switching on secondly. The method is characterized in that the method follows the principle of sequencing a power failure area and a charged area for the condition that a plurality of switches to be switched off are arranged, and sequences the power failure loss of the switches to be switched off from small to large for the condition that the switches to be switched off are arranged in the power failure area (or the charged area). And (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
In the step (5), the adaptive correction processing strategy in the case of the switch operation failure includes the steps of:
and after the step of remote control operation of the switches in the power supply recovery process is generated, the corresponding switches are remotely controlled. If the switch which fails to be remotely controlled does not exist, the operation is executed in sequence. When a certain switch is failed to be remotely controlled, the remote control operation can be tried again, and if the remote control operation is successful, the subsequent remote control operation can be executed according to the established switch remote control operation steps in the power supply recovery process;
and (3) if the remote control is invalid and the power supply of the region is not recovered, identifying the switch which fails to be remotely controlled and has been successfully remotely controlled, discharging the switch from the solution space, and returning to the step (2) to regenerate a new switch remote control operation step.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are still within the scope of the present patent invention provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. A main distribution integrated load transfer method for high-quality power supply service is characterized by comprising the following steps:
(1) determining fault equipment and power loss load: determining fault equipment through a fault alarm function of the comprehensive intelligent alarm application of the main station end, and calling an auxiliary decision to determine a power loss load;
(2) searching a main power supply path and generating a candidate scheme;
(3) main and auxiliary integrated power flow verification and optimal path determination schemes: determining an optimal path scheme based on the candidate scheme flow safety check of the main distribution integrated operation data;
(4) determining a main distribution integrated load transfer operation sequence facing a high-quality power supply service;
(5) and calling an adaptive correction processing strategy when the switch operation is obstructed.
2. The main distribution integrated load transfer method for the high-quality power supply service according to claim 1, characterized in that: the specific method of the step (1) is as follows:
(1-1) uploading switch deflection, protection action and equipment out-of-limit signals to a background system of a dispatching end through an SCADA system, and determining fault equipment according to fault diagnosis logic by comprehensive intelligent alarm;
(1-2) after the faulty equipment is determined, dyeing the network topology into a plurality of color blocks with different colors by using a dynamic network topology analysis method according to the power supply condition of the equipment, wherein the color block color is determined by an electric topology island to which a 220kV high-voltage side switch belongs, and when the state of the breaker is closed and a bus above the breaker is electrified, the color block represents a power supply area; when the state of the breaker is divided and is a fault trip switch, the color block represents a fault power loss area.
3. The main distribution integrated load transfer method for the high-quality power supply service according to claim 1 or 2, characterized in that: the specific method of the step (2) is as follows:
(2-1) firstly, adding a pulse signal with a set height to the opposite end of a boundary point switch of a power failure area, carrying out broadcast transmission on the pulse signal by combining a local topology and breadth priority technology, recording all relevant switches and feeder equipment infected by the broadcast signal and the sensing direction of the switches and the feeder equipment when the switches and the feeder equipment receive the broadcast signal, stopping the broadcast signal in the branch direction when the broadcast signal touches the boundary equipment of a power supply coloring area, and simultaneously recording the position of a reflection point; starting the transmission of the reflection point signal after the signal transmission of the transmission point is finished, wherein the principle is the same as the signal transmission of the transmission point; all the devices with different sensing directions in the positive and negative signal broadcasting processes are associated devices in an operation path, the devices with the same sensing direction are non-path devices, and the transmission sequence of the reflection point signals of the associated devices in the operation path is consistent with the corresponding actual field operation sequence;
(2-2) sequentially generating a plurality of transfer strategies for load transfer power supply when a plurality of potential secondary power supply sources exist in the load of the transfer area;
and (2-3) obtaining a candidate scheme of large-range load safety transfer under the power supply side fault including bus voltage loss and main transformer fault according to the topology search algorithm aiming at finding the critical path.
4. The main distribution integrated load transfer method for the high-quality power supply service according to claim 1 or 2, characterized in that: the specific method of the step (3) is as follows:
(3-1) adopting a main distribution cooperative power flow calculation method for main distribution integrated power flow calculation, establishing a calculation coordination control center in a main distribution system based on main distribution unified modeling by using the main distribution cooperative power flow calculation method, taking boundary node voltage and a power distribution network equivalent model as coordination variables, and respectively calling power transmission network power flow calculation and power distribution network power flow calculation functions by using a calculation idea of asynchronous iteration;
(3-2) the power transmission network load flow calculation is realized on the basis of the load flow calculation function of the current dispatcher load flow module by adopting a PQ decomposition method or a Newton-Raphson method;
(3-3) due to the special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of a Newton method cannot be met, and therefore the power flow calculation of the power distribution network is calculated by the Newton-Raphson method;
and (3-4) performing iterative correction of boundary load and node voltage according to the boundary information, finally realizing the unified power flow of the whole network, obtaining the power flow distribution and the power grid state which are consistent with those of the main network and the distribution network, determining an optimal load transfer path, and identifying switches to be closed and switches to be separated.
5. The main distribution integrated load transfer method for the high-quality power supply service according to claim 3, characterized in that: the specific method of the step (3) is as follows:
(3-1) adopting a main distribution cooperative power flow calculation method for main distribution integrated power flow calculation, establishing a calculation coordination control center in a main distribution system based on main distribution unified modeling by using the main distribution cooperative power flow calculation method, taking boundary node voltage and a power distribution network equivalent model as coordination variables, and respectively calling power transmission network power flow calculation and power distribution network power flow calculation functions by using a calculation idea of asynchronous iteration;
(3-2) the power transmission network load flow calculation is realized on the basis of the load flow calculation function of the current dispatcher load flow module by adopting a PQ decomposition method or a Newton-Raphson method;
(3-3) due to the special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of a Newton method cannot be met, and therefore the power flow calculation of the power distribution network is calculated by the Newton-Raphson method;
and (3-4) performing iterative correction of boundary load and node voltage according to the boundary information, finally realizing the unified power flow of the whole network, obtaining the power flow distribution and the power grid state which are consistent with those of the main network and the distribution network, determining an optimal load transfer path, and identifying switches to be closed and switches to be separated.
6. A main distribution integrated load transfer method for a high-quality power supply service according to claim 1 or 2, characterized in that: the specific method in the step (4) is as follows:
(4-1) respectively placing switches to be switched on and switches to be switched off into queues QH and QF, taking a VH of a switch to be switched on out of the QH, searching areas with power supply points, switching off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, forming an operation group by the searched switches to be switched off and the VH, if only switches to be switched on exist in the operation group, calling the switch to be switched on as a class 1 operation group, and placing the switch to be switched off into an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance, putting a tie switch related to a first-level load transfer circuit to the head ends of execution queues G1 and G2 to be switched on, putting the tie switch related to the second-level load to the rear end of the execution queues without related to a second-level load, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop trend analysis is needed to be carried out firstly, if closing loop is not allowed, a principle of first breaking and then closing is needed in the operation process so as to avoid overload or closed loop risks, and in order to accelerate recovery speed and reduce power failure influence, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; for the situation that the loop closing is not allowed, the sequence of the switches to be operated in the operation group is arranged according to the principle of switching off firstly and then switching on secondly; for the situation that a plurality of switches to be switched off are arranged according to the principle that a power failure area is arranged first and then a charged area is arranged, and for the situation that a plurality of switches to be switched off are arranged in the power failure area or the charged area, the switches to be switched off are arranged according to the sequence that the power failure loss of the switches to be switched off in load shedding is from small to large;
and (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
7. A main distribution integrated load transfer method oriented to a high-quality power supply service according to claim 3, characterized in that: the specific method in the step (4) is as follows:
(4-1) respectively placing switches to be switched on and switches to be switched off into queues QH and QF, taking a VH of a switch to be switched on out of the QH, searching areas with power supply points, switching off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, forming an operation group by the searched switches to be switched off and the VH, if only switches to be switched on exist in the operation group, calling the switch to be switched on as a class 1 operation group, and placing the switch to be switched off into an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance, putting a tie switch related to a first-level load transfer circuit to the head ends of execution queues G1 and G2 to be switched on, putting the tie switch related to the second-level load to the rear end of the execution queues without related to a second-level load, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop trend analysis is needed to be carried out firstly, if closing loop is not allowed, a principle of first breaking and then closing is needed in the operation process so as to avoid overload or closed loop risks, and in order to accelerate recovery speed and reduce power failure influence, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; for the situation that the loop closing is not allowed, the sequence of the switches to be operated in the operation group is arranged according to the principle of switching off firstly and then switching on secondly; for the situation that a plurality of switches to be switched off are arranged according to the principle that a power failure area is arranged first and then a charged area is arranged, and for the situation that a plurality of switches to be switched off are arranged in the power failure area or the charged area, the switches to be switched off are arranged according to the sequence that the power failure loss of the switches to be switched off in load shedding is from small to large;
and (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
8. The method for transferring the main distribution integrated load to the high-quality power supply service according to claim 4, wherein: the specific method in the step (4) is as follows:
(4-1) respectively placing switches to be switched on and switches to be switched off into queues QH and QF, taking a VH of a switch to be switched on out of the QH, searching areas with power supply points, switching off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, forming an operation group by the searched switches to be switched off and the VH, if only switches to be switched on exist in the operation group, calling the switch to be switched on as a class 1 operation group, and placing the switch to be switched off into an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance, putting a tie switch related to a first-level load transfer circuit to the head ends of execution queues G1 and G2 to be switched on, putting the tie switch related to the second-level load to the rear end of the execution queues without related to a second-level load, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop trend analysis is needed to be carried out firstly, if closing loop is not allowed, a principle of first breaking and then closing is needed in the operation process so as to avoid overload or closed loop risks, and in order to accelerate recovery speed and reduce power failure influence, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; for the situation that the loop closing is not allowed, the sequence of the switches to be operated in the operation group is arranged according to the principle of switching off firstly and then switching on secondly; for the situation that a plurality of switches to be switched off are arranged according to the principle that a power failure area is arranged first and then a charged area is arranged, and for the situation that a plurality of switches to be switched off are arranged in the power failure area or the charged area, the switches to be switched off are arranged according to the sequence that the power failure loss of the switches to be switched off in load shedding is from small to large; and (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
9. A main distribution integrated load transfer method for a high-quality power supply service according to claim 1 or 2, characterized in that: the specific method of the step (5) is as follows:
after the step of generating the switch remote control operation in the power supply recovery process, carrying out remote control operation on the corresponding switch;
if the switch which fails to be remotely controlled does not exist, the operation is executed in sequence; when a certain switch is failed to be remotely controlled, the remote control operation can be tried again, and if the remote control operation is successful, the subsequent remote control operation can be executed according to the established switch remote control operation steps in the power supply recovery process;
and (3) if the remote control is invalid and the power supply of the region is not recovered, identifying the switch which fails to be remotely controlled and has been successfully remotely controlled, discharging the switch from the solution space, and returning to the step (2) to regenerate a new switch remote control operation step.
10. A main distribution integrated load transfer method for a high-quality power supply service according to claim 3, 4 or 6, characterized in that: the specific method in the step (4) is as follows:
(4-1) respectively placing switches to be switched on and switches to be switched off into queues QH and QF, taking a VH of a switch to be switched on out of the QH, searching areas with power supply points, switching off state switches, switches to be operated and end points as boundaries from the VH to two sides of the VH according to network connection relation, forming an operation group by the searched switches to be switched off and the VH, if only switches to be switched on exist in the operation group, calling the switch to be switched on as a class 1 operation group, and placing the switch to be switched off into an operation group queue G1; the rest is called type 2 operation group and is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first-level load, a second-level load and a third-level load in sequence according to importance, putting a tie switch related to a first-level load transfer circuit to the head ends of execution queues G1 and G2 to be switched on, putting the tie switch related to the second-level load to the rear end of the execution queues without related to a second-level load, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switching operation combination is classified into class 2: the type 1 operation group only has closing operation; the class 2 operation group comprises a closing operation and a breaking operation, a closing loop trend analysis is needed to be carried out firstly, if closing loop is not allowed, a principle of first breaking and then closing is needed in the operation process so as to avoid overload or closed loop risks, and in order to accelerate recovery speed and reduce power failure influence, the operation is carried out according to the sequence of class 1 and class 2;
(4-4) respectively calculating the power failure loss reduction amount of each class 1 operation group in G1, taking out the class 1 operation group with the largest power failure loss reduction amount from G1, putting a switch to be switched on in an operation sequence queue SW, and repeating the operation until G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in G2, taking the class 2 operation group with the largest power failure loss reduction amount out of G2, deleting a switch to be opened which is placed in SW in the operation group, and then operating according to the principle of first closing and then opening for the condition of allowing loop closing; for the situation that the loop closing is not allowed, the sequence of the switches to be operated in the operation group is arranged according to the principle of switching off firstly and then switching on secondly; for the situation that a plurality of switches to be switched off are arranged according to the principle that a power failure area is arranged first and then a charged area is arranged, and for the situation that a plurality of switches to be switched off are arranged in the power failure area or the charged area, the switches to be switched off are arranged according to the sequence that the power failure loss of the switches to be switched off in load shedding is from small to large; and (4) putting the arrayed switches to be operated into an operation sequence queue SW in sequence, and repeating the operation until G2 is empty.
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