CN118472937A - Main-distribution cooperative power grid power supply recovery method and device - Google Patents
Main-distribution cooperative power grid power supply recovery method and device Download PDFInfo
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Abstract
The embodiment of the application provides a power supply recovery method and device for a power grid with cooperation of main and auxiliary power, wherein the method comprises the following steps: under the condition that faults exist in both a transmission network and a distribution network, constructing a load transfer feasible region of the distribution network; generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain, and recovering the fault of the power transmission network according to the fault recovery scheme; and determining the load of a non-fault power loss area of the power distribution network according to a fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme. The application solves the technical problems of low accuracy and recoverable load rate of the power grid power supply recovery method by the cooperation of the main and the auxiliary power grid in the related technology.
Description
Technical Field
The embodiment of the application relates to the field of computers, in particular to a power supply recovery method and device for a power grid with cooperation of a main power supply and a auxiliary power supply.
Background
When the power transmission line is broken due to factors such as extreme weather, external damage and the like, partial buses lose voltage, and the power distribution network is subjected to long-time and large-range power failure. Although the probability of bus voltage loss is small, the large-area power failure caused by the bus voltage loss is extremely harmful.
The current regional power grid accident recovery function independently operates based on main network scheduling and power distribution network scheduling, and the main power distribution network power supply recovery function independently processes load transfer in respective scheduling ranges; under the large-scale power failure accident, a globally better recovery scheme is difficult to obtain.
Disclosure of Invention
The embodiment of the application provides a power supply recovery method and device for a power grid with cooperation of main and auxiliary power, which at least solve the technical problems of low recovery accuracy and low recoverable load rate of the power supply recovery method for the power grid with cooperation of the main and auxiliary power in the related art.
According to an aspect of the embodiment of the application, there is provided a power supply recovery method of a grid in cooperation with a main and a distribution network, applied to a power system, wherein the power system comprises a transmission grid and a distribution network, and the method comprises: under the condition that faults exist in the power transmission network and the power distribution network, constructing a load transfer feasible region of the power distribution network, wherein the faults of the power transmission network meet preset fault conditions, and the load transfer feasible region is a set of load transfer schemes of a non-fault power loss region in the power distribution network; generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain, and recovering the fault of the power transmission network according to the fault recovery scheme; and determining the load of a non-fault power loss area of the power distribution network according to the fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme.
Optionally, the preset fault condition includes at least one of: the power transmission network comprises fault equipment, wherein the fault equipment is in an undeployed state or in a grid-disconnected state, and the standby electric quantity in the electric power system meets the electric quantity requirement in a preset time period; the power transmission network comprises fault equipment, and the fault equipment causes a bus of a step-down transformer in the power system to be in a voltage loss state so that a power loss area is included in the power distribution network; a faulty device in the power transmission network has been determined and isolated; the fault equipment in the power transmission network is in a state of not starting recovery; the power transmission network is in a state where the faulty equipment cannot be recovered.
Optionally, in the case that it is determined that there is a fault in both the transmission network and the distribution network, before constructing the load transfer feasible region of the distribution network, the method further includes: under the condition that the power transmission network is determined to have faults, acquiring bus voltage loss fault section data and fault repair information of the power distribution network at target time; and when the power distribution network is determined to have faults based on the busbar voltage loss fault section data and the fault repair information, positioning fault equipment in the power distribution network and executing isolation processing on the fault equipment.
Optionally, in a case where it is determined that both the transmission network and the distribution network have faults, constructing a load transfer feasible region of the distribution network includes: constructing a target network topology based on the power distribution network topology of the power distribution network, wherein the target network topology comprises a plurality of nodes and edges connecting the nodes, the nodes are used for representing the load of the power distribution network, and the edges are provided with switches for controlling the load; generating a communication graph between a plurality of feeder lines and a plurality of switches in the power distribution network by using the target network topology, wherein a power supply node of the feeder lines is a target node in a plurality of nodes; and constructing a load transfer feasible region of the power distribution network in the connected graph.
Optionally, generating a fault recovery scheme for the power transmission network based on the load transfer feasible region includes: generating an objective function by using the nodes in the load transfer feasible domain, the loads of the nodes and the weight coefficients of the loads, wherein the objective function is as follows: Omega i is the weight coefficient of the load p i, and N is the node number of the load; determining a constraint by utilizing the line in the load transfer feasible domain and the on-off of the line, wherein the constraint comprises: direct current load flow constraint, line load flow constraint, node power balance constraint, load shedding constraint, fault region recoverable load constraint and other inequality constraint; and generating the fault recovery scheme according to the objective function and the constraint.
Optionally, determining a load of a non-fault power loss region of the power distribution network according to a fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load to recover a fault of the power distribution network based on the load transfer scheme, including: inquiring a switch state corresponding to the load of the non-fault power-off area from the load transfer feasible domain to determine a switch to be turned on and a switch to be turned off; generating a switch operation sequence table based on the switch to be turned on and the switch to be turned off; and generating a load transfer scheme of the power distribution network according to the switch operation sequence table, and carrying out load transfer based on the load transfer scheme so as to recover faults of the power distribution network.
According to another aspect of the embodiment of the present application, there is also provided a power grid power restoration device with cooperation of main and auxiliary power, including: the first construction module is used for constructing a load transfer feasible region of the power distribution network under the condition that faults exist in the power transmission network and the power distribution network, wherein the faults of the power transmission network meet preset fault conditions, and the load transfer feasible region is a set of load transfer schemes of non-fault power loss areas in the power distribution network; the first generation module is used for generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain and recovering the fault of the power transmission network according to the fault recovery scheme; and the first determining module is used for determining the load of the non-fault power loss area of the power distribution network according to the fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme.
According to a further embodiment of the application, there is also provided a computer program product comprising a computer program which, when executed by a processor, implements the steps of any of the method embodiments described above.
According to a further embodiment of the application, there is also provided a computer readable storage medium having stored therein a computer program, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.
According to a further embodiment of the application there is also provided an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
According to the application, under the condition that faults exist in a power transmission network and a power distribution network, a load transfer feasible region of the power distribution network is constructed, a fault recovery scheme of the power transmission network is generated based on the load transfer feasible region, the faults of the power transmission network are recovered according to the fault recovery scheme, the load of a non-fault power loss region of the power distribution network is determined according to the fault recovery scheme of the power transmission network, and the load transfer scheme of the power distribution network is generated based on the load, so that the faults of the power distribution network are recovered based on the load transfer scheme. Realize the coordination of main and auxiliary components and the purpose of recovering the power supply of the power grid is achieved. The accuracy of power supply recovery is improved, and the technical problems of low accuracy and recoverable load rate of the power grid power supply recovery method by main and auxiliary coordination in the related technology are solved.
Drawings
Fig. 1 is a hardware block diagram of a mobile terminal of a power grid power restoration method with cooperation of a main and a auxiliary in an embodiment of the present application;
FIG. 2 is a flow chart of a method of grid power restoration for a primary and secondary coordination in accordance with an embodiment of the present application;
FIG. 3 is a flow chart of a method of power restoration scheme generation under a primary-secondary coordination in accordance with a specific embodiment of the present application;
FIG. 4 is a schematic diagram of a transmission and distribution network topology and fault location according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a graph model of a power distribution network according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the results of network reconstruction after a transmission and distribution network failure, according to an embodiment of the present application;
FIG. 7 is a schematic diagram comparing the results of two fault recovery schemes in accordance with an embodiment of the present application;
Fig. 8 is a block diagram of a main-distribution cooperative power grid power restoration device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the operation on the mobile terminal as an example, fig. 1 is a hardware structure block diagram of the mobile terminal of the power grid power restoration method with cooperation of the main and the auxiliary in the embodiment of the application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.
The memory 104 may be used to store a computer program, for example, a software program of an application software and a module, such as a computer program corresponding to a method for recovering power supplied by a power grid in cooperation with a main and auxiliary power grid in an embodiment of the present application, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, implement the method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as a NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
In this embodiment, a method for recovering power supplied by a power grid with cooperation of main and auxiliary power is provided, and the method is applied to a power system, where the power system includes a power transmission network and a power distribution network, and fig. 2 is a flowchart of the method for recovering power supplied by a power grid with cooperation of main and auxiliary power according to an embodiment of the present application, as shown in fig. 2, where the flowchart includes the following steps:
Step S202, under the condition that faults exist in the power transmission network and the power distribution network, constructing a load transfer feasible region of the power distribution network, wherein the faults of the power transmission network meet preset fault conditions, and the load transfer feasible region is a set of load transfer schemes of non-fault power loss areas in the power distribution network;
Step S204, generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain, and recovering the fault of the power transmission network according to the fault recovery scheme;
Step S206, determining the load of a non-fault power loss area of the power distribution network according to a fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme.
Through the steps, under the condition that faults exist in the power transmission network and the power distribution network, a load transfer feasible region of the power distribution network is constructed, a fault recovery scheme of the power transmission network is generated based on the load transfer feasible region, the faults of the power transmission network are recovered according to the fault recovery scheme, the load of a non-fault power loss region of the power distribution network is determined according to the fault recovery scheme of the power transmission network, the load transfer scheme of the power distribution network is generated based on the load, and the faults of the power distribution network are recovered based on the load transfer scheme. Realize the coordination of main and auxiliary components and the purpose of recovering the power supply of the power grid is achieved. The accuracy of power supply recovery is improved, and the technical problems of low accuracy and recoverable load rate of the power grid power supply recovery method by main and auxiliary coordination in the related technology are solved.
Alternatively, in a power system, the grid is responsible for efficiently transmitting the power generated by the power plant to a remote location. It is characterized in that: high voltage: to reduce energy losses during transmission, the transmission grid typically uses high voltages for transmission of electrical energy. Long distance: the transmission network is connected with the power station and the load center, and the geographical range of coverage is wider. Large-scale facilities: the transmission network comprises large facilities such as high-voltage transmission lines, substations and the like. Energy scheduling: it is responsible for scheduling energy between different regions to meet the power demands of the different regions. The distribution network is responsible for distributing the power transmitted from the transmission network to end users, such as homes, factories, etc. It is mainly characterized in that: lower voltage: the distribution network reduces the high voltage to a voltage level suitable for domestic and commercial use. Short distance: distribution networks are typically located in local areas of cities or rural areas, responsible for the transfer of electrical energy from substations to consumers. Widely distributed: the distribution network consists of a large number of telegraph poles, cables and distribution transformers, and is widely distributed. User interface: the distribution network is directly connected with the user, and is a direct connection between the power system and the user. The transmission network and the distribution network are connected through a transformer substation, and the transformer substation is responsible for reducing the high voltage of the transmission network to a voltage level which can be processed by the distribution network.
Both the transmission and distribution networks may experience various faults during operation, which may affect the stability and the power supply reliability of the power system. The following are some common types of faults that may be encountered by the transmission and distribution networks:
faults present in the grid include, but are not limited to: short circuit fault: the current suddenly increases 3 due to dielectric breakdown or direct contact between conductors. Breaking fault: the circuit is interrupted, resulting in no current flow. Ground fault: the wire is electrically connected with the ground accidentally. Aging the equipment: the grid equipment may experience reduced performance or failure over time. Damage by external force: such as natural disasters (forest fires, ice and snow, high winds, etc.) or artifacts (construction damage, illegal intrusion, etc.), cause grid faults.
Faults present in the distribution network include, but are not limited to: ground fault: single phase grounding in a power distribution network is a common type of failure that may be caused by tree contact wires, equipment aging, or external forces. Bus failure: the bus in the transformer substation causes abnormal current due to faults. Distribution line fault: the branch is many, the fault signal is weak, the running environment is complex, and the influence of equipment aging, tree bamboo line collision, external force damage and the like is easy to occur. Equipment failure: distribution transformers and other devices fail due to an excess of service life or improper maintenance. Overload of load: the electrical loads exceed the design capacity of the distribution network, resulting in overheating or damage to the equipment.
Alternatively, a load transfer feasible region of a power distribution network refers to the possible paths and conditions in the power distribution network that may transfer load from one power supply point (e.g., a substation or feeder) to another power supply point when a fault occurs or maintenance is performed. These paths and conditions are limited by the topology of the grid, device capacity, line limitations, and system stability. The following are some key factors that affect the load transfer feasible region of the distribution network: the topology of the power grid: the connection mode of the distribution network comprises whether a ring network or a radial structure exists or not, and configuration of a connecting line and a switch. Device capacity limitation: the capacity of substations and transmission lines limits the amount of load that can be transferred. The transferred load cannot exceed the safe operating limits of the device. Line thermal limit: the transmission line has a current carrying limit beyond which it can overheat, so the transferred load must be within the thermal limits of the line. System stability: load transfer cannot affect voltage stability and frequency stability of the system, and dynamic balance of the whole system needs to be maintained.
In one exemplary embodiment, the preset fault condition includes at least one of: the power transmission network comprises fault equipment, wherein the fault equipment is in an undeployed state or in a grid-released state, but the standby electric quantity in the power system meets the electric quantity requirement in a preset time period, namely black start is not needed; the power transmission network comprises fault equipment, and the fault equipment leads a bus of a step-down transformer in the power system to be in a voltage loss state, so that a power loss area (a large-area power failure of the power distribution network) is included in the power distribution network; a faulty device in the power transmission network has been determined and the faulty device has been isolated; the fault equipment in the power transmission network is in a state of not starting recovery; the grid is in a state where the faulty equipment cannot be recovered (i.e., all blackout loads cannot be recovered).
In an exemplary embodiment, before constructing the load transfer feasible region of the power distribution network in case of determining that there is a fault in both the power transmission network and the power distribution network, the method further comprises: under the condition that the power transmission network is determined to have faults, acquiring bus voltage loss fault section data and fault repair information of the power distribution network at target time; and when the power distribution network is determined to have faults based on the busbar voltage loss fault section data and the fault repair information, positioning fault equipment in the power distribution network and executing isolation processing on the fault equipment.
Optionally, the bus voltage loss fault section data and the fault repair information of the power distribution network at the target time are bus voltage loss fault section data and fault repair information at the moment before the transmission network fault in the power distribution automation system.
The bus voltage loss fault refers to a state in which the bus voltage drops to a level where normal power supply cannot be maintained for some reason in the power system. Such faults may be caused by a variety of factors including, but not limited to, equipment failure, protection device malfunction, external disturbances, and the like. In handling bus out-of-voltage faults, collecting and analyzing fault section data is an important step, which helps to determine the cause of the fault and take corresponding action. The fault section data includes data of the following aspects: failure time: the specific point in time at which the fault occurred is recorded, which facilitates subsequent analysis of the cause of the fault. Failure phenomenon: including the action condition of the protection device, the tripping condition of the circuit breaker, the indication change of the instrument, etc. Fault recording data: the system state change before and after the fault occurs can be analyzed through the voltage and current waveform data collected by the fault recorder. Device status: the operation states of related equipment before and after the fault are checked, including the position of a circuit breaker, the state of a protective device, the load condition of a transformer and the like. Operation record: the operation behaviors before and after the fault, including switch operation, equipment maintenance and the like, are recorded so as to eliminate the possibility of faults caused by human operation errors. External factors: considering the external environment when the fault occurs, such as weather conditions, natural disasters, etc., these factors may affect the power system. System load conditions: analyzing the system load condition at the moment of failure, the high load may cause overload of equipment, thereby causing failure. Protection device and automation system: checking whether the protection device acts correctly, whether the automation system responds normally, and the bus voltage loss can be caused by improper protection action or failure of the automation system. Communication and monitoring system: it is important to confirm whether communication and monitoring systems are operating properly, and these systems provide real-time data and fault diagnosis information for fault analysis. By comprehensively analyzing the data, the reasons of the bus voltage-loss faults can be positioned, and corresponding preventive and rectifying measures are formulated so as to improve the reliability and safety of the system.
When a power system fails, such as a power outage, voltage anomaly, or other problem, the customer or system monitoring equipment reports the problem to the utility company through the fault repair system. The following are key elements of the fault repair information: and (3) repairing time: recording the specific time at which the customer reported the fault aids in quick response and analysis of the frequency and pattern of fault occurrences. Customer information: including customer contact information such as name, address and contact phone to facilitate contacting and confirming the location of the fault. Description of faults: customer provided fault phenomenon descriptions including power outage scope, presence or absence of sparks or abnormal sounds, etc. Fault location: the exact location where the fault occurs, such as a street, cell, or specific building. Influence range: the size of the area affected by the fault, such as affecting a home, a building, or a community. System monitoring data: real-time data from smart meters, sensors, or automatic monitoring systems may include changes in voltage, current, frequency, etc. parameters. The fault repair system is typically tightly integrated with Customer Relationship Management (CRM) systems, geographic Information Systems (GIS), and work scheduling systems to achieve efficient fault management and resource allocation.
In one exemplary embodiment, in the event that it is determined that both the transmission network and the distribution network are faulty, constructing a load transfer feasible region of the distribution network includes: constructing a target network topology based on the power distribution network topology of the power distribution network, wherein the target network topology comprises a plurality of nodes and edges connected with the nodes, the nodes are used for representing the load of the power distribution network, and the edges are provided with switches for controlling the load; generating a communication graph between a plurality of feeder lines and a plurality of switches in the power distribution network by using a target network topology, wherein a power supply node of the feeder lines is a target node in a plurality of nodes; and constructing a load transfer feasible region of the power distribution network in the connected graph.
Alternatively, the load transfer feasible domain includes a combination of all transfer compliance. The construction of the load transfer feasible region specifically comprises the following steps:
S1, a power distribution network variable structure dissipation network model (namely a target network topology) oriented to fault processing is established according to the power distribution network topology in a power distribution automation system.
S2, the number of the power distribution network connection systems (namely, the communication lines in the communication diagram) is obtained. A group of feeders interconnected by tie switches is called a tie in which the load can only be transferred.
S3, transferring the load feasible region in the structural connection system.
Optionally, in one connection system, a plurality of non-communicated sub-graph structures can be obtained by operating the interconnection switch and the load switch; m connection points are arranged between the connection system and the main network; the connection system corresponds to an undirected graph with node weights, a minimum k cut set (k=1, …, M) of the connection system is solved based on Stoer-Wagner algorithm (i.e. the minimum cut problem that the graph is divided into k sub-graphs), and sub-graphs with loads not exceeding the maximum capacity of feeder lines where the sub-graphs are located and maintaining a radial structure are screened out of all sub-graphs. The Stoer-Wagner algorithm can calculate all the minimum cutsets in polynomial time; and since the connection point M of a connection system and a main network is usually smaller, all minimum k cut sets meeting the conditions can be listed through an exhaustion method, so that the load transfer combination forming the connection system can be ensured in time and spaceThe corresponding load transfer combinations are calculated for all K connection systemsI.e. the load transfer feasible region. Combining load transfer according to connection point of power distribution network to main networkThe inequality constraint of the load in the main network model is converted into: wherein phi p is a load node set of a main network and a power distribution network connection point in a main network model, p i is the load of a main network node i, For allowing the maximum load of the access node i after load transfer.
In one exemplary embodiment, a fault recovery scheme for a power transmission network is generated based on a load transfer feasible region, comprising: generating an objective function by using the nodes in the load transfer feasible domain, the loads of the nodes and the weight coefficients of the loads, wherein the objective function is as follows: Omega i is the weight coefficient of the load p i, and N is the node number of the load; determining a constraint by utilizing a line in a load transfer feasible domain and on-off of the line, wherein the constraint comprises: direct current load flow constraint, line load flow constraint, node power balance constraint, load shedding constraint, fault region recoverable load constraint and other inequality constraint; generating a fault recovery scheme according to the objective function and the constraint.
Optionally, the grid dc power flow constraint is ：-2θmax(1-αij)≤θi-θj-xijPij≤2θmax(1-αij),ij∈Nl(3),, where N l is a line set, α ij is a binary variable, which indicates the on-off condition of the line ij (α ij =1 is line on, α ij =0 is line off), θ i is the phase angle of the node i, θ max is the node maximum phase angle, P ij is the active power of the line ij, and x ij is the impedance of the line ij. When α ij =1, the line connection, the above formula becomes a direct current flow equation; when α ij =0, the line power in the above equation is 0 (guaranteed by equation (4)), and becomes a value range constraint of the phase angle.
The line tide constraint is as follows:
the node power balancing constraint is: wherein p gi is the power generated by node i (0 when no generator is connected), N i is the line set connecting node i, and N b is the main network model node set.
The load shedding constraint is as follows:
the fault region recoverable load constraint is: Where Φ p is the set of power loss load nodes, and p L is the total load of the power loss region before failure. This constraint ensures that the upper limit of the total load recovered is the total load before failure.
Other inequality constraints:
-θmax≤θi≤θmax,i∈Nb (1)。
(1) The combined integer linear programming problem is formed, the optimization problem is solved through a branch-and-bound method, the line state and the load shedding condition of the network transmission fault recovery are obtained, and then the switch operation sequence is generated, so that an accurate network transmission fault recovery scheme is obtained.
In one exemplary embodiment, determining a load of a non-faulty power loss area of a power distribution network according to a fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load to recover from a fault of the power distribution network based on the load transfer scheme, includes: inquiring a switch state corresponding to the load of a non-fault power-off area from a load transfer feasible domain to determine a switch to be turned on and a switch to be turned off; generating a switch operation sequence table based on the switch to be turned on and the switch to be turned off; and generating a load transfer scheme of the power distribution network according to the switch operation sequence table, and carrying out load transfer based on the load transfer scheme so as to recover the faults of the power distribution network.
Optionally, the distribution network schedule transfers the feasible region from the load according to the transferred load requirementThe corresponding switch state is searched and inquired, and an accurate switch operation sequence table is generated according to the switch state.
The application is illustrated below with reference to specific examples:
FIG. 3 is a flow chart of the present embodiment, as shown in FIG. 3, comprising the steps of:
s301, judging whether a preset fault condition is met after the power transmission network fails.
As shown in the topological network of fig. 4, the transmission network comprises 14 nodes, and the distribution network comprises 3 feeder lines and 13 nodes; three feeder lines of the power distribution network are respectively connected to the power transmission network node 9, the node 14 and the node 10; the lines 10-11 and 12-13 of the transmission network are normally open lines, and the lines 5-12, 7-16 and 10-14 of the distribution network correspond to the contact switches of 3 feeder lines and are normally open lines.
It is assumed that at a certain moment the lines 6-13 and 9-10 of the transmission network are cut off by the relay protection device due to a fault. After the fault, the system is not disconnected, the generator is not disconnected, and black start is not needed; node 10 becomes an isolated node, and the power distribution network feeder line 2 has large-area power failure; the transmission network fault positioning program is easy to judge faults of the lines 6-13 and 9-10, and the relay protection device automatically isolates the fault line; after the lines 10-11 are put into operation, the node 10 is connected to the power transmission network, but through rapid power flow calculation, under the condition that the line power flow is not out of limit, the nodes 10, 13 and 14 lose part of load, and the power transmission network cannot recover all power failure loads. Therefore, the fault meets the fault recovery condition of the method proposed by the present embodiment, and is applicable to the main-configuration cooperative fault recovery method of the present embodiment.
S302, judging whether the power distribution network has faults or not.
And judging that no fault exists in the distribution network in the event through the bus voltage loss fault section data and the fault repair information at the moment before the main network (namely the transmission network) fault in the distribution automation system.
S303, constructing a distribution network transfer load feasible region based on a minimum cut-set method. The method specifically comprises the following steps:
S3031, a power distribution network variable structure dissipation network model facing fault processing is established according to the power distribution network topology (shown in fig. 5) in the power distribution automation system, as shown in the power distribution network topology in fig. 4, the nodes are connected with loads, and the sides correspond to load switches.
S3032, 3 feeder lines in the power distribution network can form a communication diagram through the closing operation of the connecting switches 5-12, 7-16 and 10-14, so that the power distribution network has 1 connection system.
S3033, transferring the load feasible domain in the construction connection system.
The power supply nodes of the 3 feeder lines are respectively node 1, node 2 and node 3, so that the minimum 3 cut sets are obtained, and each sub-graph only comprises 1 power supply node. A total of 60 load transfer combinations can be obtained through a minimum cut-set algorithm to form a load transfer feasible regionAs shown in table 1:
Table 1:
considering the maximum load that can be provided by 3 feeders, will Conversion to a load transfer inequality constraint:
0≤p9≤44.25
0≤p10≤13.5
0≤p14≤22.35
p9+p10+p14≤53.4 (9)。
s304, generating a network transmission fault recovery scheme by constructing a mixed integer optimization problem for minimizing the number of power loss loads.
Assuming that all loads are of equal importance, the objective function is:
the direct current power flow constraint of the power transmission network is as follows:
-2θmax(1-αij)≤θi-θj-xijPij≤2θmax(1-αij),ij∈[1,...,20](11), Wherein θ max =360°.
The line tide constraint is as follows: Wherein,
The node power balancing constraint is: Wherein, p gi = [40,10,0,0,8,0,5,0,0,0,0,0,0], the generator on node 1 is the balanced node.
The load shedding constraint is as follows: Wherein, The maximum value of the remaining loads except the loads of the node 9, the node 10 and the node 14 is the load of each node before the fault, and the above equation reflects the cut load range of each node.
The fault area is node 9, node 10 and node 14, and the recoverable load constraint is the total load before the fault, i.e. p 9+p10+p14 is less than or equal to 53.4 (15).
Other inequality constraints: - θ max≤θi≤θmax, i e [ 2..14 ] (16).
Since node 1 is a balanced node, θ 1 =0.
The present embodiment solves the above mixed integer linear programming problem by a branch-and-bound method, so that a line state of transmission network fault recovery, α ij = [1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,1,1,0,1], i.e. line 10-11 is closed (as shown in the transmission network part of fig. 6), and loads of each node, p i = [0, 21.7,94.2,47.8,7.6,11.2,0, 0, 44.2,4.5,3.5,6.1,2.8,4.7], indicate that there is a cut load condition at node 10, node 13 and node 14, and the load of node 9 is greater than the load before the fault, which will be achieved by the power distribution network scheduling through the load transfer operation of S305. And generating a switching operation sequence according to the line state, and obtaining the network transmission fault recovery scheme.
S305, obtaining a power distribution network load transfer scheme according to the load transfer feasible region.
Specifically, according to the transmission network fault recovery scheme, the load of the corresponding non-fault power loss distribution network is obtained, namely, p 9＝44.25,p10＝4.49,p14 =4.66. The distribution network schedules the transfer load requirement, and the distribution network is from a feasible domainThe corresponding switch states are searched for, and the switches 8-9, 10-14 and 13-15 of the power distribution network need to be opened, and other switches need to be closed, as shown in the power distribution network part of fig. 6. And generating a switch operation sequence according to the switch state, and carrying out load transfer. Fig. 7 is a comparison chart of load recovery results of two fault recovery schemes, wherein the first scheme is a recovery scheme only considering the constraint of the power transmission network in the related art, the second scheme is a fault recovery scheme considering the cooperation of the main and the auxiliary in the specific embodiment, and the second scheme can transfer part of the loads on the node 10 and the node 14 to the node 9 and recover more loads, which indicates that the fault recovery scheme of the method provided by the specific embodiment has better effect.
In the generation process of the main network fault recovery scheme, the practical embodiment fully considers the load transfer feasible region of the power distribution network, so that the power distribution network fault recovery scheme can realize the maximum power supply recovery after the main network fault recovery. And solving a load transfer feasible region of the power distribution network through a minimum cut-set algorithm. And generating a main network fault recovery scheme by taking a mixed integer linear programming model of a load transfer feasible region constraint of the power distribution network into consideration. And carrying out power distribution network fault recovery through a load transfer feasible region and a main network fault recovery result. After the main network is recovered, the power distribution network fault recovery scheme can achieve maximum power supply recovery.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiment also provides a device for recovering power supplied by a power grid with cooperation of main and auxiliary power, which is used for realizing the embodiment and the preferred embodiment, and is not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 8 is a block diagram of a power grid power restoration apparatus for cooperation between a main and a sub-grid according to an embodiment of the present application, as shown in fig. 8, including:
A first construction module 82, configured to construct a load transfer feasible region of the power distribution network when it is determined that both the power transmission network and the power distribution network have faults, where the faults of the power transmission network satisfy a preset fault condition, and the load transfer feasible region is a set of load transfer schemes of a non-fault power loss region in the power distribution network;
A first generation module 84 for generating a fault recovery scheme for the power transmission network based on the load transfer feasible region, and recovering from a fault of the power transmission network according to the fault recovery scheme;
A first determining module 86 is configured to determine a load of a non-faulty power loss area of the power distribution network according to a fault recovery scheme of the power transmission network, and generate a load transfer scheme of the power distribution network based on the load, so as to recover a fault of the power distribution network based on the load transfer scheme.
In one exemplary embodiment, the preset fault condition includes at least one of: the power transmission network comprises fault equipment, wherein the fault equipment is in an undeployed state or in a grid-disconnected state, and the standby electric quantity in the electric power system meets the electric quantity requirement in a preset time period; the power transmission network comprises fault equipment, and the fault equipment causes a bus of a step-down transformer in the power system to be in a voltage loss state so that a power loss area is included in the power distribution network; a faulty device in the power transmission network has been determined and isolated; the fault equipment in the power transmission network is in a state of not starting recovery; the power transmission network is in a state where the faulty equipment cannot be recovered.
In an exemplary embodiment, the above apparatus further includes: the first acquisition module is used for acquiring bus voltage loss fault section data and fault repair information of the power distribution network at a target time under the condition that the power transmission network is determined to have faults before a load transfer feasible region of the power distribution network is constructed under the condition that the power transmission network is determined to have faults; and the second determining module is used for positioning fault equipment in the power distribution network and executing isolation processing on the fault equipment when determining that the power distribution network has faults based on the busbar voltage loss fault section data and the fault repair information.
In an exemplary embodiment, the first building block includes: the first construction unit is used for constructing a target network topology based on the power distribution network topology of the power distribution network, wherein the target network topology comprises a plurality of nodes and edges connecting the nodes, the nodes are used for representing the load of the power distribution network, and the edges are provided with switches for controlling the load; a first generating unit, configured to generate a connectivity graph between a plurality of feeder lines and a plurality of switches in the power distribution network by using the target network topology, where a power supply node of the feeder lines is a target node of a plurality of the nodes; and the second construction unit is used for constructing the load transfer feasible region of the power distribution network in the connected graph.
In an exemplary embodiment, the first generating module includes: a second generating unit, configured to generate an objective function by using the node in the load transfer feasible domain, the load of the node, and a weight coefficient of the load, where the objective function is: omega i is the weight coefficient of the load p i, and N is the node number of the load; the first determining unit is used for determining a constraint by utilizing the line in the load transfer feasible domain and the on-off of the line, wherein the constraint comprises the following steps: direct current load flow constraint, line load flow constraint, node power balance constraint, load shedding constraint, fault region recoverable load constraint and other inequality constraint; and the third generating unit is used for generating the fault recovery scheme according to the objective function and the constraint.
In an exemplary embodiment, the first determining module includes: the first inquiring unit is used for inquiring the switch state corresponding to the load of the non-fault power-losing area from the load transfer feasible domain so as to determine a switch to be turned on and a switch to be turned off; a fourth generating unit, configured to generate a switch operation sequence table based on the switch to be turned on and the switch to be turned off; and the fifth generating unit is used for generating a load transfer scheme of the power distribution network according to the switch operation sequence table, and carrying out load transfer based on the load transfer scheme so as to recover the fault of the power distribution network.
It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; or the above modules may be located in different processors in any combination.
Embodiments of the application also provide a computer program product comprising a computer program which, when executed by a processor, implements the steps of any of the method embodiments described above.
Embodiments of the present application also provide another computer program product comprising a non-volatile computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of any of the method embodiments described above.
Embodiments of the present application also provide a computer program comprising computer instructions stored in a computer-readable storage medium; the processor of the computer device reads the computer instructions from the computer readable storage medium and the embedder executes the computer instructions to cause the computer device to perform the steps of any of the method embodiments described above.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.
In one exemplary embodiment, the computer readable storage medium may include, but is not limited to: a usb disk, a Read-only Memory (ROM), a random access Memory (Random Access Memory RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing a computer program.
An embodiment of the application also provides an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
In an exemplary embodiment, the electronic device may further include a transmission device connected to the processor, and an input/output device connected to the processor.
Specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the exemplary implementation, and this embodiment is not described herein.
It will be appreciated by those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for recovering power supplied by a power grid with cooperation of a main power grid and a distribution power grid, which is applied to a power system, wherein the power system comprises a power transmission grid and a distribution power grid, the method comprising:
Under the condition that faults exist in the power transmission network and the power distribution network, constructing a load transfer feasible region of the power distribution network, wherein the faults of the power transmission network meet preset fault conditions, and the load transfer feasible region is a set of load transfer schemes of a non-fault power loss region in the power distribution network;
generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain, and recovering the fault of the power transmission network according to the fault recovery scheme;
And determining the load of a non-fault power loss area of the power distribution network according to the fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme.
2. The method of claim 1, wherein the preset fault condition comprises at least one of:
the power transmission network comprises fault equipment, wherein the fault equipment is in an undeployed state or in a grid-disconnected state, and the standby electric quantity in the electric power system meets the electric quantity requirement in a preset time period;
the power transmission network comprises fault equipment, and the fault equipment causes a bus of a step-down transformer in the power system to be in a voltage loss state so that a power loss area is included in the power distribution network;
a faulty device in the power transmission network has been determined and isolated;
the fault equipment in the power transmission network is in a state of not starting recovery;
The power transmission network is in a state where the faulty equipment cannot be recovered.
3. The method of claim 1, wherein in the event that a fault is determined to exist in both the transmission network and the distribution network, prior to constructing a load transfer feasible region of the distribution network, the method further comprises:
Under the condition that the power transmission network is determined to have faults, acquiring bus voltage loss fault section data and fault repair information of the power distribution network at target time;
And when the power distribution network is determined to have faults based on the busbar voltage loss fault section data and the fault repair information, positioning fault equipment in the power distribution network and executing isolation processing on the fault equipment.
4. The method of claim 1, wherein in the event that a determination is made that both the transmission network and the distribution network are faulty, constructing a load transfer feasible region of the distribution network comprises:
Constructing a target network topology based on the power distribution network topology of the power distribution network, wherein the target network topology comprises a plurality of nodes and edges connecting the nodes, the nodes are used for representing the load of the power distribution network, and the edges are provided with switches for controlling the load;
Generating a communication graph between a plurality of feeder lines and a plurality of switches in the power distribution network by using the target network topology, wherein a power supply node of the feeder lines is a target node in a plurality of nodes;
and constructing a load transfer feasible region of the power distribution network in the connected graph.
5. The method of claim 1, wherein generating a fault recovery scheme for the power transmission grid based on the load transfer feasible region comprises:
Generating an objective function by using the nodes in the load transfer feasible domain, the loads of the nodes and the weight coefficients of the loads, wherein the objective function is as follows: Omega i is the weight coefficient of the load p i, and N is the node number of the load;
Determining a constraint by utilizing the line in the load transfer feasible domain and the on-off of the line, wherein the constraint comprises: direct current load flow constraint, line load flow constraint, node power balance constraint, load shedding constraint, fault region recoverable load constraint and other inequality constraint;
And generating the fault recovery scheme according to the objective function and the constraint.
6. The method of claim 1, wherein determining a load of a non-faulty power loss area of the power distribution network according to a fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load to recover from a fault of the power distribution network based on the load transfer scheme, comprises:
Inquiring a switch state corresponding to the load of the non-fault power-off area from the load transfer feasible domain to determine a switch to be turned on and a switch to be turned off;
generating a switch operation sequence table based on the switch to be turned on and the switch to be turned off;
and generating a load transfer scheme of the power distribution network according to the switch operation sequence table, and carrying out load transfer based on the load transfer scheme so as to recover faults of the power distribution network.
7. The utility model provides a power grid power supply recovery unit that main configuration was cooperated which characterized in that includes:
The first construction module is used for constructing a load transfer feasible region of the power distribution network under the condition that faults exist in both the power transmission network and the power distribution network, wherein the faults of the power transmission network meet preset fault conditions, and the load transfer feasible region is a set of load transfer schemes of non-fault power loss areas in the power distribution network;
The first generation module is used for generating a fault recovery scheme of the power transmission network based on the load transfer feasible domain and recovering the fault of the power transmission network according to the fault recovery scheme;
And the first determining module is used for determining the load of the non-fault power loss area of the power distribution network according to the fault recovery scheme of the power transmission network, and generating a load transfer scheme of the power distribution network based on the load so as to recover the fault of the power distribution network based on the load transfer scheme.
8. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method as claimed in any one of claims 1 to 6.
9. A computer readable storage medium, characterized in that a computer program is stored in the computer readable storage medium, wherein the computer program, when being executed by a processor, implements the steps of the method according to any of the claims 1 to 6.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any one of claims 1 to 6 when the computer program is executed.
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