CN111952972B - Main-auxiliary integrated load transfer method for high-quality power supply service - Google Patents
Main-auxiliary integrated load transfer method for high-quality power supply service Download PDFInfo
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- CN111952972B CN111952972B CN202010836329.7A CN202010836329A CN111952972B CN 111952972 B CN111952972 B CN 111952972B CN 202010836329 A CN202010836329 A CN 202010836329A CN 111952972 B CN111952972 B CN 111952972B
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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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- Engineering & Computer Science (AREA)
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Abstract
A main-distribution integrated load transfer method facing high-quality power supply service comprises the following steps: (1) determining a faulty device and a power loss load: determining fault equipment through a fault alarm function of the comprehensive intelligent alarm application at a master station end, and calling an auxiliary decision to determine a power loss load; (2) Searching a main-auxiliary integrated power supply path and generating a candidate scheme; (3) Main and auxiliary integrated tide verification and optimal path scheme determination: determining an optimal path scheme based on the power flow safety check of the candidate scheme of the main-distribution integrated operation data; (4) Determining a main-distribution integrated load transfer operation sequence facing to high-quality power supply service; (5) And when the switch operation is blocked, the adaptive correction processing strategy is called. The invention can solve the problem that the main network and the distribution network are mutually independent and cannot be cooperated and quickly recovered under large-scale power failure accidents, and realize the whole-network quick load transfer of the main network and the distribution network under the power grid faults.
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
With the increasing of the conditions of daily operation overload, out-of-limit, fault, maintenance, operation mode change and the like of regional power grids, the requirements of users on power supply quality and power supply reliability are also higher.
When the power grid fails, an emergency strategy for load recovery is given in time, further development of power grid accidents can be effectively controlled, 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 accident prediction, simulation calculation and other modes, decision basis and means for preventing are provided for an emergency processing system, and the capacity of resisting the disaster of the power grid accident is improved.
Under the condition that the power grid breaks down, a dispatcher needs to quickly master the system load loss condition so as to effectively carry out recovery treatment after the fault. The existing main network control system can automatically position fault equipment under the condition of power grid faults and give out information such as power failure range caused by the faults, but due to lack of related information of a power distribution network, the number of users and the power supply level of the users affected by the faults cannot be subdivided, the influence degree of the faults is difficult to evaluate in time, and quick transfer of the total network load with priority of 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 providing a load transfer method capable of realizing the cooperative and rapid recovery of a main distribution network and the main distribution integration under the power grid fault.
The invention solves the technical problems by adopting a technical scheme that the main-distribution integrated load transfer method facing the 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 at a master station end, and calling an auxiliary decision to determine a power loss load;
(2) Searching a main-auxiliary integrated power supply path and generating a candidate scheme;
(3) Main and auxiliary integrated tide verification and optimal path scheme determination: determining an optimal path scheme based on the power flow safety check of the candidate scheme of the main-distribution integrated operation data;
(4) Determining a main-distribution integrated load transfer operation sequence facing to high-quality power supply service;
(5) And when the switch operation is blocked, the adaptive correction processing strategy is called.
Further, the specific method of the step (1) is as follows:
(1-1) an SCADA (data acquisition and monitoring control system) system uploads signals of switch deflection, protection action and equipment out-of-limit to a scheduling end background system, and comprehensive intelligent alarms determine fault equipment according to fault diagnosis logic;
after fault equipment is determined, a dynamic network topology analysis method is utilized to dye the network topology into a plurality of color blocks with different colors according to the power supply condition of the equipment, the color of the color blocks is determined by an electrical topology island to which a 220kV high-voltage side switch belongs, and when the state of the circuit breaker is closed and a bus above the circuit breaker is electrified, the color blocks represent a power supply area; when the state of the circuit 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 at the opposite end of a boundary point switch of a power failure area, carrying out broadcast transmission of the pulse signal by combining a local topology and breadth first technology, recording all relevant switches and feeder devices infected by the broadcast signal and the perception directions when the relevant switches and feeder devices receive the broadcast signal, stopping propagation of the broadcast signal in the branch direction when the broadcast signal reaches the boundary device of a power coloring area, and recording the position of a reflecting point; after the signal of the transmitting point is transmitted, the transmission of the signal of the reflecting point is started, and the principle is the same as that of the transmission of the signal of the transmitting point; all the devices with different sensing directions in the front and back signal broadcasting processes are associated devices in the operation path, the devices with the same sensing directions are non-path devices, and the propagation 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 there are multiple potential alternate sources of power to the load of the transfer area, sequentially generating multiple transfer strategies for load transfer power;
and (2-3) obtaining a candidate scheme for large-range load safety transfer under power supply side faults including bus voltage loss and main transformer faults according to the topology searching algorithm aiming at finding the critical path.
Further, the specific method of the step (3) is as follows:
(3-1) main-distribution integrated power flow calculation adopts a main-distribution cooperative power flow calculation method, a calculation coordination control center is established in a main-distribution system based on main-distribution unified modeling, boundary node voltage and a power distribution network equivalent model are used as coordination variables, and a transmission network power flow calculation function and a power distribution network power flow calculation function are respectively called by utilizing an asynchronous iterative calculation idea;
(3-2) carrying out power transmission network power flow calculation based on the current dispatcher power flow module power flow calculation function, and adopting a PQ decomposition method or a Newton-Lawson method to carry out the power transmission network power flow calculation;
(3-3) because of special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of the Newton method cannot be met, and therefore Newton-Lafson method is adopted for power flow calculation of the power distribution network;
and (3-4) carrying out iterative correction on boundary loads and node voltages according to the boundary information, finally realizing unified power flow of the whole network, obtaining power flow distribution and power grid states consistent with the main power distribution network, determining an optimal load transfer path, and identifying to-be-combined and to-be-separated switches.
Further, the specific method in step (4) is as follows:
(4-1) putting the switch to be closed and the switch to be opened into queues QH and QF respectively, taking out one switch to be closed VH from the QH, searching areas which take power points, opening state switches, switches to be operated and tip points as boundaries from the VH to the two sides according to the network connection relation, forming an operation group by the searched switch to be closed and the VH, and if only the switch to be closed exists in the operation group, then, the operation group is called a type 1 operation group, and putting the operation group into the operation group queue G1; the rest is called a class 2 operation group, and the class 2 operation group is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first stage, a second stage and a third stage according to importance, placing a connecting switch related to a first stage load transfer line at the head end of an execution queue G1 and a first stage load to be closed, placing a second stage load not related to the second stage load at the rear end of the execution queue, and generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switch operation combination is classified into 2 categories: the class 1 operation group only has closing operation; the class 2 operation group not only contains closing operation but also contains opening operation, ring closing trend analysis needs to be carried out firstly, if ring closing is not allowed, a principle of opening and closing after opening is needed to be adopted in the operation process, so that the risk of overload or closed loop is avoided, and 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 the switch to be closed into 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 out the class 2 operation group with the largest power failure loss reduction amount from G2, deleting a switch to be opened which is already put into the SW in the operation group, and then operating according to the principle of switching on first and then switching off for the situation of allowing ring closing; for the situation that the ring is not allowed to be closed, arranging the sequence of the switches to be operated in the operation group according to the principle that the opening is firstly performed and then the closing is performed; the method is characterized in that the sequence is carried out according to the principle that the power failure area is followed by the charging area when the plurality of switch to be separated are arranged, and the sequence is carried out according to the sequence from small to large of the power failure loss of the load thrown by the switch to be separated when the plurality of switch to be separated are arranged in the power failure area or the charging area. And sequentially placing the arranged switches to be operated into an operation sequence queue SW, and repeating the operations until G2 is empty.
Further, the specific method of step (5) is as follows:
and after the step of remote control operation of the switch in the power supply recovery process is generated, the corresponding switch is remotely controlled. If no remote control failure switch exists, the operation is executed in sequence; when a certain switch remote control failure is encountered, firstly, 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 step of the power supply recovery process;
if the repeated remote control is invalid for more than 3 times and the power supply of the area is not recovered, identifying the switch with failed remote control and successful remote control operation, discharging the switch from the solution space, and returning to the step (2) to regenerate a new switch remote control operation step.
The invention can solve the problem that the main network accident and the distribution network accident are mutually independent, realize the cooperative and rapid recovery under the large-scale power failure accident and realize the whole-network rapid load transfer of the main network and the distribution network under the power grid fault.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
Referring to fig. 1, the present embodiment includes the steps of: (1) determining a faulty device and a power loss load: the master station side determines fault equipment by integrating a fault alarm function of the intelligent alarm application, and invokes an auxiliary decision to determine a power loss load;
(2) Searching a main-auxiliary integrated power supply path and generating a candidate scheme;
(3) Main and auxiliary integrated tide verification and optimal path scheme determination: carrying out power flow safety check of candidate schemes based on the main-configuration integrated operation data, and determining an optimal path scheme;
(4) Determining a main-distribution integrated load transfer operation sequence facing to high-quality power supply service;
(5) In the executing process, if a remote control failure switch exists, the self-adaptive correction processing strategy is returned to the step (2); otherwise, the execution process ends.
In the step (1), the fault alarm function of the comprehensive intelligent alarm application at the master station end determines fault equipment, and the step of calling an auxiliary decision to determine the power loss load is as follows:
and (1-1) uploading signals such as switch deflection, protection action, equipment out-of-limit and the like to a dispatching end background system by an SCADA (data acquisition and monitoring control) system, and determining fault equipment according to fault diagnosis logic by comprehensive intelligent alarm.
After fault equipment is determined, a dynamic network topology analysis method is utilized to dye the network topology into a plurality of color blocks with different colors according to the power supply condition of the equipment, the color of the color blocks is determined by an electrical topology island to which a 220kV high-voltage side switch belongs, and when the state of the circuit breaker is closed and a bus above the circuit breaker is electrified, the color blocks represent a power supply area; and when the state of the circuit breaker is divided into a fault trip switch, the color block represents a fault power loss area.
In the step (2), the steps of searching the main-auxiliary integrated power supply path and generating a candidate scheme are as follows:
(2-1) after the system is divided by the color blocks, the failure recovery method of the power failure area is changed into a process of searching the power 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, broadcast transmission of the pulse signal is carried out by combining a local topology and breadth first technology, all relevant switches, feeder lines and other devices infected by the broadcast signal are recorded, the perception direction when the broadcast signal is received is recorded, and when the broadcast signal reaches the boundary device of the power coloring area, the broadcast signal in the branch direction stops transmitting, and meanwhile, the position of a reflecting point is recorded. After the signal of the transmitting point is transmitted, the transmission of the reflected point signal is started, and the principle is the same as that of the transmission of the signal of the transmitting point. All the devices with different sensing directions in the front and back signal broadcasting processes are associated devices in the operation path, the devices with the same sensing directions are non-path devices, and the propagation 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 there are multiple potential alternative power sources for the load of the transfer area, then sequentially generating multiple transfer strategies for the load transfer power;
and (2-3) according to the topology searching algorithm aiming at finding the critical path, a candidate scheme for large-range load safety transfer under 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 trend check of the main-configuration integrated operation data is as follows:
(3-1) main-distribution integrated power flow calculation adopts a main-distribution cooperative power flow calculation method, a calculation coordination control center is established in a main-distribution system based on main-distribution unified modeling, boundary node voltage and a power distribution network equivalent model are used as coordination variables, and a transmission network power flow calculation function and a power distribution network power flow calculation function are respectively called by utilizing an asynchronous iterative calculation idea;
(3-2) the transmission network power flow calculation is realized based on the current dispatcher power flow module power flow calculation function, and can be realized by adopting a PQ decomposition method or a Newton-Lafson method;
(3-3) because of special network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of the Newton method cannot be met, and therefore Newton-Lafson method is adopted for power flow calculation of the power distribution network;
and (3-4) carrying out iterative correction on boundary loads and node voltages according to the boundary information, and finally realizing unified power flow of the whole network to obtain the power flow distribution and the power grid state consistent with the main power distribution network. And determining an optimal load transfer path, and identifying to-be-closed and to-be-split switches.
In the step (4), the step of determining the main-distribution integrated load transfer operation sequence for the high-quality power supply service is as follows:
(4-1) placing the switch to be closed and the switch to be opened into queues QH and QF respectively, taking out one switch to be closed VH from the QH, searching areas which take power points, opening state switches, switches to be operated and tip points as boundaries from the VH to the two sides according to the network connection relation, and forming an operation group by the searched switch to be opened and the VH. If only the switch to be closed is in the operation group, the operation group is called a class 1 operation group, and the class 1 operation group is put into an operation group queue G1; the rest is called a class 2 operation group, and the class 2 operation group is put into an operation group queue G2;
and (4-2) dividing the 10KV load into a first-stage load, a second-stage load and a third-stage load according to importance. The tie switch related to the primary load transfer line is placed at the head end of an execution queue (G1, G2) to be switched on, the secondary load is related, and the tie switch not related to the primary load is placed at the rear end of the execution queue. Generating an initialization operation queue according to the principle;
(4-3) if QH is not empty, return to (4-1) until the switch operation combination is classified into 2 categories: the class 1 operation group only has closing operation; the class 2 operation group not only comprises closing operation but also comprises opening operation, ring closing trend analysis needs to be carried out firstly, if ring closing is not allowed, a principle of opening and closing after opening is needed to be adopted in the operation process, so that the risk of overload or closed loop is avoided. In order to accelerate the recovery speed and reduce the influence of power failure, the method is executed 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 the switch to be closed into 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 out the class 2 operation group with the largest power failure loss reduction amount from G2, deleting a switch to be opened which is already put into the SW in the operation group, and then operating according to the principle of switching on first and then switching off for the situation of allowing ring closing; and under the condition that the ring is not allowed to be closed, arranging the sequence of the switches to be operated in the operation group according to the principle of opening and closing firstly. The method is characterized in that the method is used for sequencing according to the principle that a power failure area is followed by a charging area when a plurality of to-be-switched-off switches are arranged, and the method is used for sequencing according to the sequence from small to large of the power failure loss of the load thrown off when the plurality of to-be-switched-off switches are arranged in the power failure area (or the charging area). And sequentially placing the arranged switches to be operated into an operation sequence queue SW, and repeating the operations until G2 is empty.
In the step (5), the adaptive correction processing strategy at the time of the switching operation failure is as follows:
and after the step of remote control operation of the switch in the power supply recovery process is generated, the corresponding switch is remotely controlled. If the remote control failure switch does not exist, the operation is executed in sequence. When a certain switch remote control failure is encountered, firstly, 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 step of the power supply recovery process;
if repeated remote control is invalid for a plurality of times (such as 3 times) and power supply of the area is not recovered, identifying the switch with failed remote control and successful remote control operation, 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 occur to those skilled in the art, and, if such modifications and variations are within the scope of the claims and their equivalents, they are also within the scope of the patent of the present invention.
What is not described in detail in the specification is prior art known to those skilled in the art.
Claims (3)
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 at a master station end, and calling an auxiliary decision to determine a power loss load;
(2) Searching a main-auxiliary integrated power supply path and generating a candidate scheme;
(3) Main and auxiliary integrated tide verification and optimal path scheme determination: determining an optimal path scheme based on the power flow safety check of the candidate scheme of the main-distribution integrated operation data;
(4) Determining a main-distribution integrated load transfer operation sequence facing to high-quality power supply service;
(5) Invoking an adaptive correction processing strategy when the switch is in disorder;
the specific method of the step (1) is as follows:
(1-1) uploading signals of switch deflection, protection action and equipment out-of-limit 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;
after fault equipment is determined, a dynamic network topology analysis method is utilized to dye the network topology into a plurality of color blocks with different colors according to the power supply condition of the equipment, the colors of the color blocks are determined by an electrical topology island to which a 220kV high-voltage side switch belongs, and when the state of a circuit breaker is closed and a bus above the circuit breaker is electrified, the color blocks represent a power supply area; when the state of the circuit breaker is divided into a fault tripping switch, the color block represents a fault power-losing area;
the specific method of the step (2) is as follows:
(2-1) firstly adding a pulse signal with a set height at the opposite end of a boundary point switch of a power failure area, carrying out broadcast transmission of the pulse signal by combining a local topology and breadth first technology, recording all relevant switches and feeder devices infected by the broadcast signal and the perception directions when the relevant switches and feeder devices receive the broadcast signal, stopping propagation of the broadcast signal in the branch direction when the broadcast signal reaches the boundary device of a power coloring area, and recording the position of a reflecting point; after the signal of the transmitting point is transmitted, the transmission of the signal of the reflecting point is started, and the principle is the same as that of the transmission of the signal of the transmitting point; all the devices with different sensing directions in the front and back signal broadcasting processes are associated devices in the operation path, the devices with the same sensing directions are non-path devices, and the propagation 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 there are multiple potential alternate sources of power to the load of the transfer area, sequentially generating multiple transfer strategies for load transfer power;
(2-3) obtaining a candidate scheme of large-range load safety transfer under power supply side faults including bus voltage loss and main transformer faults according to the steps (2-1) and (2-2);
the specific method in the step (4) is as follows:
(4-1) putting the switch to be closed and the switch to be opened into queues QH and QF respectively, taking out one switch to be closed VH from the QH, searching areas which take power points, opening state switches, switches to be operated and tip points as boundaries from the VH to the two sides according to the network connection relation, forming an operation group by the searched switch to be closed and the VH, and if only the switch to be closed exists in the operation group, then, the operation group is called a type 1 operation group, and putting the operation group into the operation group queue G1; the rest is called a class 2 operation group, and the class 2 operation group is put into an operation group queue G2;
(4-2) dividing the 10KV load into a first stage load, a second stage load and a third stage load according to importance, placing a contact switch related to a first stage load transfer line at the first end of an execution queue G1 to be closed and an execution queue G2 to be closed, placing the contact switch related to the second stage load at the rear end of the execution queue if the contact switch is not related to the second stage load, and generating an initialization operation queue according to the principle;
(4-3) if the queue QH is not empty, return (4-1) until the switch operation combination is classified into 2 categories: the class 1 operation group only has closing operation; the class 2 operation group not only contains closing operation but also contains opening operation, ring closing trend analysis needs to be carried out firstly, if ring closing is not allowed, a principle of opening and closing after opening is needed to be adopted in the operation process, so that the risk of overload or closed loop is avoided, and 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 the operation group queue G1, taking out the class 1 operation group with the largest power failure loss reduction amount from the operation group queue G1, putting the switch to be closed into the operation sequence queue SW, and repeating the operation until the operation group queue G1 is empty;
(4-5) respectively calculating the power failure loss reduction amount of each class 2 operation group in the operation group queue G2, taking out the class 2 operation group with the largest power failure loss reduction amount from the operation group queue G2, deleting a switch to be opened which is put in the SW in the operation group, and then operating according to the principle of switching on first and then switching off for the situation of allowing ring closing; for the situation that the ring is not allowed to be closed, arranging the sequence of the switches to be operated in the operation group according to the principle that the opening is firstly performed and then the closing is performed; for the situation that the switch is provided with a plurality of switches to be disconnected, the switch is sequenced according to the principle that the power is cut off firstly and then the switch is electrified, and for the situation that the switch is provided with a plurality of switches to be disconnected in the power cut off area or the switch is electrified, the switch is sequenced according to the sequence from small to large of the power cut loss of the load thrown by the switch;
and sequentially placing the arranged switches to be operated into an operation sequence queue SW, and repeating the operation until the operation group queue G2 is empty.
2. The main-distribution integrated load transfer method for high-quality power supply service according to claim 1, wherein the main-distribution integrated load transfer method is characterized in that: the specific method of the step (3) is as follows:
(3-1) main-distribution integrated power flow calculation adopts a main-distribution cooperative power flow calculation method, a calculation coordination control center is established in a main-distribution system based on main-distribution unified modeling, boundary node voltage and a power distribution network equivalent model are used as coordination variables, and a transmission network power flow calculation function and a power distribution network power flow calculation function are respectively called by utilizing an asynchronous iterative calculation idea;
(3-2) carrying out power transmission network power flow calculation based on the current dispatcher power flow module power flow calculation function, and adopting a PQ decomposition method or a Newton-Lawson method to carry out the power transmission network power flow calculation;
(3-3) because of the network structure and parameter distribution characteristics of the power distribution network, P, Q decoupling conditions of the Newton method cannot be met, and therefore the Newton-Laporton method is adopted for power flow calculation of the power distribution network;
and (3-4) carrying out iterative correction on boundary loads and node voltages according to the boundary information, finally realizing unified power flow of the whole network, obtaining power flow distribution and power grid states consistent with the main power distribution network, determining an optimal load transfer path, and identifying to-be-combined and to-be-separated switches.
3. The main-distribution integrated load transfer method for high-quality power supply service according to claim 1 or 2, wherein: the specific method of the step (5) is as follows:
after a switch remote control operation step of a power supply recovery process is generated, performing remote control operation on a corresponding switch;
if no remote control failure switch exists, the operation is executed in sequence; when a certain switch fails in remote control, firstly, trying to perform the remote control operation again, and if the remote control operation is successful, executing subsequent remote control operation according to the established switch remote control operation step of the power supply recovery process;
if the repeated remote control is invalid for more than 3 times and the power supply of the area is not recovered, identifying the switch with failed remote control and successful remote control operation, discharging the switch from the solution space, and returning to the step (2) to regenerate a new switch remote control operation step.
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| CN111952972B (en) * | 2020-08-19 | 2023-08-01 | 中国能源建设集团湖南省电力设计院有限公司 | Main-auxiliary integrated load transfer method for high-quality power supply service |
| CN114091885B (en) * | 2021-11-16 | 2023-08-25 | 国网江苏省电力有限公司连云港供电分公司 | Power protection method and system for important power utilization clients |
| CN114389369B (en) * | 2022-03-23 | 2022-07-05 | 广东承能电力安装有限公司 | Intelligent monitoring system and method for electric room load |
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| CN114925993A (en) * | 2022-05-06 | 2022-08-19 | 国网上海市电力公司 | Cascading failure searching method and system for power system containing new energy |
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| CN117060404B (en) * | 2023-10-11 | 2024-03-05 | 广东电网有限责任公司江门供电局 | Power distribution network feeder line group-to-power supply control method and device |
| CN117373851B (en) * | 2023-12-07 | 2024-03-08 | 南京瀚元科技有限公司 | Closing interlocking method suitable for user demarcation switch |
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