Fault recovery control method for power distribution network comprising distributed power supply and related device

Abstract

The invention provides a fault recovery control method for a power distribution network comprising a distributed power supply and a related device. The fault recovery control method for the power distribution network comprises the following steps: acquiring fault information of the power distribution network; performing line protection and distributed power supply control based on the power distribution network fault information; acquiring first voltage information of the power distribution network, and determining first closing information based on the first voltage information; synchronizing operation parameters of the distributed power supply based on the first switching-on information; determining second switching-on information based on the operation parameters of the distributed power supply; by optimizing the line reclosing process, the power distribution network DG can operate in an isolated island mode, the operation flexibility of a power source is improved, power supply is continuously provided for important loads, and the power supply reliability and flexibility of the power distribution network are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network protection and automatic control, and in particular to a distribution network fault recovery control method and related devices including a distributed power source. Background Art

[0002] The distribution network is directly connected to the user. When a line fails, it will cause power outages and damage to the user, affecting the economic benefits of the power grid. There are many overhead lines in medium and high voltage distribution networks, which are prone to failures due to bad weather, natural disasters, etc. Due to the high proportion of instantaneous failures, in order to improve the power supply reliability of the distribution network, transmission lines are widely equipped with automatic reclosing devices. In view of the adverse effects of the access of a large number of distributed renewable energy sources (DG) on line reclosing, the current strategy commonly adopted in power grid operation is to cut off DG after a fault occurs. This solution will cause DG to stop operating, which is not conducive to the consumption and utilization of new energy. As the output of renewable energy DG in new distribution systems increases, the rash removal of DG will affect the safe operation and power supply reliability of the entire distribution network.

[0003] Therefore, there is a technical problem in the prior art that the existing closing method is not conducive to the utilization of distributed power sources and affects the safety and reliability of the distribution network operation. Summary of the invention

[0004] The main purpose of the present invention is to provide a distribution network fault recovery control method and related devices including distributed power sources, so as to solve the technical problem that the existing closing method in the prior art is not conducive to the utilization of distributed power sources and affects the safety and reliability of distribution network operation.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a distribution network fault recovery control method including distributed power sources is provided, comprising the following steps: obtaining distribution network fault information; performing line protection and distributed power source control based on the distribution network fault information; obtaining first voltage information of the distribution network, and determining first closing information based on the first voltage information; synchronizing operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include the voltage and frequency of the distributed power source; and determining second closing information based on the operating parameters of the distributed power source.

[0006] In some embodiments, performing line protection based on the distribution network fault information includes: determining the fault type based on the current and voltage waveforms recorded by the protection recording; constructing a reclosing time model based on the fault type; and determining the reclosing time based on the reclosing time model.

[0007] In some embodiments, the distributed power supply control based on the distribution network fault information includes: performing ride-through control of the distributed power supply based on the distribution network fault information; judging the operation mode of the distributed power supply based on the ride-through control, and when the island operation mode is met, the distributed power supply enters the island operation mode, and performs island division based on the load conditions; adjusting the island operation strategy, switching the PQ control strategy to the networking control strategy of the virtual synchronous generator VSG.

[0008] In some embodiments, synchronizing the operating parameters of the distributed power source based on the first closing information includes: determining a synchronous closing judgment condition based on the first closing information; and synchronizing the operating parameters of the distributed power source based on the synchronous closing judgment condition.

[0009] In some implementations, determining the second closing information based on the operating parameters of the distributed power source includes: when the frequency and phase of the distributed power source meet the closing judgment condition, determining the second closing information.

[0010] In some implementations, the island division based on the load condition includes: constructing an optimization model with the goal of providing maximum load by weighting the load importance:

[0011]

[0012] Where: i is the weight of load i, and the load is divided into primary load, secondary load and tertiary load, and their weight coefficients are 10, 3 and 0.1 respectively; P Loadi is the active power of load i; i is the 0-1 state variable of load i, ξ i =0 means load i is removed, ξ i =1 means reserved load i; P DGj is the active power output of DGj; P 备用 For backup during island operation, 5% to 10% of the total DG power can be used.

[0013] In some embodiments, the synchronous closing judgment condition is: the line L voltage standard value U Line Higher than 0.7pu, the voltage per unit value deviation on both sides of the circuit breaker |U N -U Line |<0.2pu, voltage phase difference on both sides of the circuit breaker Voltage frequency deviation on both sides of the circuit breaker |f N -f Line |<0.5Hz, that is:

[0014]

[0015] According to another aspect of the present invention, the present invention also provides a distribution network fault recovery control device including a distributed power source, comprising: an acquisition module for acquiring distribution network fault information; a protection control module for performing line protection and distributed power source control based on the distribution network fault information; a first determination module for acquiring first voltage information of the distribution network and determining first closing information based on the first voltage information; a synchronization module for synchronizing operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include the voltage and frequency of the distributed power source; and a second determination module for determining second closing information based on the operating parameters of the distributed power source.

[0016] According to another aspect of the present invention, the present invention further provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the aforementioned methods for controlling distribution network fault recovery including distributed power sources.

[0017] According to another aspect of the present invention, the present invention also provides an electronic device, comprising at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the distribution network fault recovery control method including distributed power sources as described in any of the above items when executing the computer program on the memory.

[0018] The distribution network fault recovery control method including distributed power sources provided by the present disclosure is applied to obtain distribution network fault information; perform line protection and distributed power source control based on the distribution network fault information; obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; synchronize the operating parameters of the distributed power source based on the first closing information; determine second closing information based on the operating parameters of the distributed power source; and optimize the line reclosing process so that the distribution network DG can operate in an islanded manner, thereby improving the flexibility of power supply operation, continuously providing power supply for important loads, and improving the power supply reliability and flexibility of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A wiring diagram of a typical power distribution network including distributed power sources is shown;

[0021] Figure 2 A control flow chart of a distribution network fault recovery control method including a distributed power source provided by the present disclosure is shown;

[0022] Figure 3 A flowchart of the steps of performing line protection based on distribution network fault information provided by the present disclosure is shown;

[0023] Figure 4 A flowchart of the steps of performing ride-through control of a distributed power source based on the distribution network fault information provided by the present disclosure is shown;

[0024] Figure 5 The VSG control block diagram of the distributed power supply provided by the present disclosure is shown;

[0025] Figure 6 The active power-frequency droop control characteristic curve of the distributed power supply provided by the present disclosure is shown;

[0026] Figure 7 It is a structural block diagram of a distribution network fault recovery control device including a distributed power source provided by the present disclosure;

[0027] Figure 8 It is a schematic diagram of the structure of the electronic device provided by the present disclosure. DETAILED DESCRIPTION

[0028] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0029] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0031] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0032] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0033] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0034] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0036] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0037] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] The construction of distribution network has become a key component in the development of smart grid in my country. Figure 1 A typical distribution network wiring diagram including distributed generation is shown. Figure 1 It can be seen that the busbars M and N are respectively provided with circuit breakers CB1 and CB2 for disconnecting the busbars, and the distributed power sources DG1 and 2 are also provided with circuit breakers CB3 and CB4 for disconnecting them from the main grid.

[0039] During the operation of the distribution network, when a line fails, the distributed generation can be disconnected from the main grid as needed. As the proportion of distributed generation in the distribution system gradually increases, rashly cutting off DG will affect the safe operation and power supply reliability of the entire distribution network.

[0040] In order to solve the technical problem in the prior art that the existing closing method is not conducive to the utilization of distributed power sources and affects the safety and reliability of distribution network operation, the present invention provides a distribution network fault recovery control method and related devices including distributed power sources.

[0041] Figure 2 The control flow chart of the distribution network fault recovery control method including distributed power sources provided by the present disclosure is shown as follows: Figure 2 As shown, the distribution network fault recovery control method including distributed power sources includes the following steps:

[0042] S101, obtaining distribution network fault information.

[0043] In this step, distribution network fault information is obtained.

[0044] Specifically, when line MN fails, the fault information of the distribution network is obtained. After the distribution network fails, the line main protection detects the fault, and trips the circuit breakers CB1 and CB2 between bus M and bus N, and sends the fault status information to the distribution network control master station and distributed power sources.

[0045] S102: Perform line protection and distributed power supply control based on the distribution network fault information.

[0046] After completing the above step S101, in this step, line protection and distributed power supply control are performed based on the distribution network fault information.

[0047] Further, Figure 3 The flowchart of the steps of performing line protection based on the distribution network fault information provided by the present disclosure is shown as follows: Figure 3 As shown, line protection is performed based on the distribution network fault information, including the following steps:

[0048] S201, determining the fault type based on the current and voltage waveforms recorded by the protection recording.

[0049] In this step, the fault type is determined based on the current and voltage waveforms recorded by the protection recording.

[0050] Specifically, the fault type and nature are identified according to the current and voltage waveforms recorded by the protection recorder, and the fault type includes permanent fault and transient fault.

[0051] When the nature of the fault is judged to be a permanent fault, adaptive reclosing is not performed; it is necessary to first check the cause of the fault based on the current and voltage waveforms recorded by the protection recording, and perform manual reclosing after the fault is cleared; when the nature of the fault is judged to be a transient fault, a reclosing time model is constructed.

[0052] S202: construct a reclosing time model based on the fault type.

[0053] After completing the above step S201, in this step, a reclosing time model is constructed based on the fault type.

[0054] Specifically, when it is determined that the fault nature is a transient fault, a reclosing time model is constructed, wherein the time model is:

[0055] t=t 断 +t 固有 +t 裕度 +t 保护

[0056] Where: t represents the time required for the reclosing switch to reclose; t 断 Indicates the arc extinction time; t 固有 Indicates the time required for the circuit breaker to complete the closing action; t 裕度 Indicates the margin time reserved to ensure system stability; t 保护 Indicates the delay time required for the protection device to operate after detecting a fault to avoid false operation.

[0057] S203: Determine the reclosing time based on the reclosing time model.

[0058] After the complete model is constructed, in this step, the arc extinction time, the time required for the circuit breaker to complete the closing action, the margin time and the protection time are determined respectively, and the reclosing time is determined based on the reclosing time model.

[0059] While performing line protection based on the distribution network fault information, distributed power supply control is also performed based on the distribution network fault information. Figure 4 The flowchart of the steps of performing the ride-through control of the distributed power source based on the distribution network fault information provided by the present disclosure is shown, which specifically includes the following steps:

[0060] S301, performing ride-through control of distributed power sources based on the distribution network fault information.

[0061] In this step, the ride-through control of the distributed power source is performed based on the distribution network fault information.

[0062] Specifically, during a distribution network failure, the distributed power source performs fault ride-through control and does not go offline prematurely. This setting can ensure that after a failure occurs during equipment operation, the system can quickly return to normal, avoiding production stagnation and quality problems.

[0063] S302, judging the operation mode of the distributed power source based on the ride-through control, when the island operation mode is satisfied, the distributed power source enters the island operation mode, and performs island division based on the load condition.

[0064] After completing the above step S301, in this step, the operation mode of the distributed power source is determined based on the ride-through control. When the island operation mode is met, the distributed power source enters the island operation mode and performs island division based on the load conditions.

[0065] Specifically, after the distributed power source performs ride-through control, the distributed power source determines whether an island operation condition is met. When the island operation condition is met, the distributed power source enters an island operation state, and the island operation condition is determined based on voltage and frequency.

[0066] The voltage criterion is any of the following: the grid connection point voltage satisfies U<50%U N , and the maximum opening time exceeds 0.2s; 50% U N ≤U<85%U N , and the maximum opening time exceeds 2.0s; 110% U N ≤U<135%U N , and the maximum opening time exceeds 2.0s; 135% U N ≤U, and the maximum opening time exceeds 0.2s; U is the grid connection point voltage, U N It is the rated voltage of the grid at the point where the distributed generation is connected to the grid.

[0067] The frequency criterion is that the frequency f on the distributed power supply side satisfies f>50.2Hz or f<47.5Hz and the running time is greater than 0.2s.

[0068] Correspondingly, the distribution network automation control master station performs load matching and divides islands according to the distributed power sources and load conditions on the grid.

[0069] Specifically, the distribution network control master station performs load matching based on the current output of distributed power sources, the output forecast curve of distributed power sources, and the current load level, and leaves a certain stability margin. The matching method is as follows:

[0070] Construct an optimization model that provides maximum load by weighting the load importance:

[0071]

[0072] Where: i is the weight of load i, and the load is divided into primary load, secondary load and tertiary load, and their weight coefficients are 10, 3 and 0.1 respectively; P Loadi is the active power of load i; iis the 0-1 state variable of load i, ξ i =0 means load i is removed, ξ i =1 means reserved load i; P DGj is the active power output of DGj; P 备用 For backup during island operation, 5% to 10% of the total DG power can be taken; through the weighted summation of load importance, the power supply of important loads is guaranteed, and the removal of unimportant loads is minimized to achieve the purpose of balancing DG output and load power. At the same time, a certain margin is left to avoid DG instability due to power imbalance during short-term island operation.

[0073] When the fault is determined to be a transient fault, the above method is used to instantly match the load. When the fault is confirmed to be a permanent fault, the island standby is enabled to ensure stable operation of the DG end.

[0074] S303, adjusting the island operation strategy, switching the PQ control strategy to the network control strategy of the virtual synchronous generator VSG.

[0075] After completing the above step S302, in this step, the island operation strategy is adjusted, and the PQ control strategy is switched to the network control strategy of the virtual synchronous generator VSG.

[0076] Specifically, in the short-term island operation mode before the reclosing moment arrives, the control strategy of the distributed power inverter in island operation is switched from the PQ control strategy to the networking control strategy of the virtual synchronous generator VSG, so that the distributed power source does not need to be disconnected from the grid, which improves the flexibility of the operation of the new energy power source and is conducive to the consumption of new energy.

[0077] Figure 5 The VSG control block diagram of the distributed power source provided by the present disclosure is shown, wherein the virtual synchronous generator VSG control method of the distributed power source is:

[0078] For the frequency control of distributed power sources, the active power-frequency droop characteristics of synchronous generators are introduced, such as Figure 6 As shown, the virtual mechanical power P can be adjusted m At the same time, the frequency deviation feedback instruction ΔP is introduced f , realize the grid-connected inverter active power instruction P ref Regulation;

[0079] Among them, the frequency deviation feedback instruction is:

[0080] ΔP f =-k f (ff n )

[0081] Where: ΔP f is the active power deviation; kf is the active power regulation coefficient, f is the voltage frequency at the DG terminal, and f n is the system rated frequency;

[0082] Corresponding to the virtual mechanical power P of the synchronous generator m for:

[0083] P m =P ref -k f (ff n )

[0084] Where: P ref is the active power reference value controlled by VSG;

[0085] For the voltage control of distributed power sources, the reactive power-voltage droop characteristic control of synchronous generators is introduced, and the voltage control of distributed power sources is achieved by adjusting the virtual potential E.

[0086] The virtual potential command value E consists of three parts: the no-load potential E0 of the virtual synchronous generator, the ΔE for adjusting the reactive power Q Output ΔE corresponding to the excitation regulation or voltage regulation of the synchronous generator U ,Right now:

[0087] E=E0+ΔE U +ΔE Q

[0088] ΔE U =K U (U ref -U)

[0089] ΔE Q =K Q (Q ref -Q)

[0090] Where: K U is the reactive power regulation coefficient based on voltage difference; U ref is the reference value of the inverter output voltage; U is the actual output voltage; K Q is the reactive power adjustment coefficient based on reactive power difference; Q ref is the reactive power reference value controlled by VSG, and Q is the actual value of the reactive power output by the inverter.

[0091] S103: Acquire first voltage information of the distribution network, and determine first closing information based on the first voltage information.

[0092] After completing the above step S102, in this step, first voltage information of the distribution network is obtained, and first closing information is determined based on the first voltage information.

[0093] Specifically, after the fault is cleared, the reclosing time is up, and first, the line protection close to the main grid side M passes the inspection of the no-voltage reclosing circuit breaker CB1.

[0094] At this time, the first voltage information of the distribution network is obtained, and the first voltage information is the main network bus voltage U M and line voltage U Line ; The first closing information is the line protection detection no-pressure reclosing judgment condition, specifically: the main grid bus voltage U M The per-unit value is higher than 0.7pu, and the line voltage U Line The per-unit value is less than 0.2pu, that is:

[0095]

[0096] When the M-side line meets the above judgment conditions, the circuit breaker CB1 is subjected to voltage-free reclosing.

[0097] S104: Synchronize operating parameters of the distributed power source based on the first closing information, where the operating parameters of the distributed power source include voltage and frequency of the distributed power source.

[0098] After completing the above step S103, in this step, the operating parameters of the distributed power source are synchronized based on the first closing information, wherein the operating parameters of the distributed power source include the voltage and frequency of the distributed power source.

[0099] Specifically, after the M-side line is tested for no-pressure reclosing, the N-side line is tested for protection and synchronous reclosing. The judgment conditions for the N-side line protection and synchronous reclosing are:

[0100] Line L voltage per unit value U Line Higher than 0.7pu, the voltage per unit value deviation U on both sides of the circuit breaker N -U Line |<0.2pu, voltage phase difference on both sides of the circuit breaker Voltage frequency deviation on both sides of the circuit breaker |f N -f Line |<0.5Hz, that is:

[0101]

[0102] S105: Determine second closing information based on operating parameters of the distributed power source.

[0103] After completing the above step S104, in this step, the second closing information is determined based on the operating parameters of the distributed power source.

[0104] Specifically, the line protection close to the distribution network side N detects whether the two sides are synchronized. When they are not synchronized, a synchronization control instruction is sent to the distributed power supply. The distributed power supply adjusts the VSG control strategy according to the synchronization control instruction to make the frequency and phase of the distributed power supply consistent with the main grid side. After the synchronization conditions are met, the circuit breaker CB2 is reclosed; through the VSG control of the DG, it is made consistent with the voltage and frequency of the main grid side to avoid excessive grid-connected transient shocks on the distribution network.

[0105] In one embodiment of the present disclosure, after the closing of the circuit breaker is completed, the method further includes:

[0106] The distributed generation adjusts the inverter control strategy to PQ droop control according to the control instructions, and the distribution network control master station recloses the circuit breaker of the cut-off load line to restore power supply to all loads.

[0107] The distribution network fault recovery control method including distributed power sources provided by the present disclosure is applied to obtain distribution network fault information; perform line protection and distributed power source control based on the distribution network fault information; obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; synchronize the operating parameters of the distributed power source based on the first closing information; determine second closing information based on the operating parameters of the distributed power source; and optimize the line reclosing process so that the distribution network DG can operate in an islanded manner, thereby improving the flexibility of power supply operation, continuously providing power supply for important loads, and improving the power supply reliability and flexibility of the distribution network.

[0108] In order to better implement the above method, the second aspect of the present disclosure further provides a distribution network fault recovery control device including a distributed power source, and the control device can be integrated on an electronic device.

[0109] For example, Figure 7 As shown, the alarm device 200 may include: an acquisition module 210, a protection control module 220, a first determination module 230, a synchronization module 240 and a second determination module 250, as follows:

[0110] (1) An acquisition module 210, which is used to acquire distribution network fault information.

[0111] (2) A protection control module 220, wherein the protection control module 220 is used to perform line protection and distributed power supply control based on the distribution network fault information.

[0112] (3) A first determination module 230, wherein the first determination module 230 is configured to obtain first voltage information of the power distribution network and determine first closing information based on the first voltage information.

[0113] (4) A synchronization module 240, wherein the synchronization module 240 is used to synchronize the operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include the voltage and frequency of the distributed power source.

[0114] (5) A second determination module 250, wherein the second determination module 250 is configured to determine second closing information based on operating parameters of the distributed power source.

[0115] Furthermore, the protection control module 220 includes a first determination unit, a construction unit and a second determination unit, wherein the first determination unit is used to determine the fault type based on the current and voltage waveforms recorded by the protection recording, the construction unit is used to construct a reclosing time model based on the fault type, and the second determination unit is used to determine the reclosing time based on the reclosing time model.

[0116] Furthermore, the protection control module 220 also includes a control unit, a division unit and an adjustment unit. The control unit performs ride-through control of the distributed power source based on the distribution network fault information. The division unit determines the operation mode of the distributed power source based on the ride-through control. When the island operation mode is met, the distributed power source enters the island operation mode and performs island division based on the load conditions. The adjustment unit is used to adjust the island operation strategy and switch the PQ control strategy to the networking control strategy of the virtual synchronous generator VSG.

[0117] Furthermore, the first determination module 230 includes a third determination unit and a synchronization unit, the third determination unit is used to determine a synchronous closing judgment condition based on the first closing information; the synchronization unit synchronizes the operating parameters of the distributed power supply based on the synchronous closing judgment condition.

[0118] Further, determining the second closing information based on the operating parameters of the distributed power source includes determining the second closing information when the frequency and phase of the distributed power source meet a closing judgment condition.

[0119] Furthermore, the island division based on the load situation includes: constructing an optimization model with the goal of providing maximum load by weighting the load importance:

[0120]

[0121] Where: i is the weight of load i, and the load is divided into primary load, secondary load and tertiary load, and their weight coefficients are 10, 3 and 0.1 respectively; P Loadi is the active power of load i; i is the 0-1 state variable of load i, ξ i =0 means load i is removed, ξi =1 means reserved load i; P DGj is the active power output of DGj; P 备用 For backup during island operation, 5% to 10% of the total DG power can be used.

[0122] Furthermore, the synchronous closing judgment condition is: the line L voltage per unit value U Line Higher than 0.7pu, the voltage per unit value deviation on both sides of the circuit breaker |U N -U Line |<0.2pu, voltage phase difference on both sides of the circuit breaker Voltage frequency deviation on both sides of the circuit breaker |f N -f Line |<0.5Hz, that is:

[0123]

[0124] The distribution network fault recovery control device including distributed power sources provided by the present disclosure is applied to obtain distribution network fault information; perform line protection and distributed power source control based on the distribution network fault information; obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; synchronize the operating parameters of the distributed power source based on the first closing information; determine second closing information based on the operating parameters of the distributed power source; and optimize the line reclosing process so that the distribution network DG can operate in an islanded manner, thereby improving the flexibility of power supply operation, continuously providing power supply for important loads, and improving the power supply reliability and flexibility of the distribution network.

[0125] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0126] To this end, a third embodiment of the present disclosure provides a storage medium, which is a computer-readable medium and stores a computer program. When the computer program is executed by a processor, the method provided by the embodiment of the present disclosure is implemented, including the following steps S11 to S15:

[0127] S11, obtaining distribution network fault information;

[0128] S12, performing line protection and distributed power supply control based on the distribution network fault information;

[0129] S13, obtaining first voltage information of the distribution network, and determining first closing information based on the first voltage information;

[0130] S14, synchronizing operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include voltage and frequency of the distributed power source;

[0131] S15, determining second closing information based on the operating parameters of the distributed power source.

[0132] Furthermore, when the computer program is executed by a processor, other methods provided by any of the above embodiments of the present disclosure are implemented.

[0133] The distribution network fault recovery control method including distributed power sources provided by the present disclosure is applied to obtain distribution network fault information; perform line protection and distributed power source control based on the distribution network fault information; obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; synchronize the operating parameters of the distributed power source based on the first closing information; determine second closing information based on the operating parameters of the distributed power source; and optimize the line reclosing process so that the distribution network DG can operate in an islanded manner, thereby improving the flexibility of power supply operation, continuously providing power supply for important loads, and improving the power supply reliability and flexibility of the distribution network.

[0134] Example 4

[0135] A fourth embodiment of the present disclosure provides an electronic device, such as Figure 8 As shown, the electronic device at least includes a memory 310 and a processor 320. The memory 310 stores a computer program. The processor 320 implements the method provided by any embodiment of the present disclosure when executing the computer program on the memory 310. Exemplarily, the method executed by the electronic device computer program is as follows:

[0136] S11, obtaining distribution network fault information;

[0137] S12, performing line protection and distributed power supply control based on the distribution network fault information;

[0138] S13, obtaining first voltage information of the distribution network, and determining first closing information based on the first voltage information;

[0139] S14, synchronizing operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include voltage and frequency of the distributed power source;

[0140] S15, determining second closing information based on the operating parameters of the distributed power source.

[0141] In specific implementation, the above-mentioned: acquisition module 210, protection control module 220, first determination module 230, synchronization module 240 and second determination module 250 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.

[0142] The distribution network fault recovery control method including distributed power sources provided by the present disclosure is applied to obtain distribution network fault information; perform line protection and distributed power source control based on the distribution network fault information; obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; synchronize the operating parameters of the distributed power source based on the first closing information; determine second closing information based on the operating parameters of the distributed power source; and optimize the line reclosing process so that the distribution network DG can operate in an islanded manner, thereby improving the flexibility of power supply operation, continuously providing power supply for important loads, and improving the power supply reliability and flexibility of the distribution network.

[0143] The storage medium may be included in the electronic device, or may exist independently without being installed in the electronic device.

[0144] The storage medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains at least two Internet Protocol addresses; sends a node evaluation request including at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0145] Alternatively, the storage medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0146] Computer program code for performing operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the passenger computer, partially on the passenger computer, as a separate software package, partially on the passenger computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the passenger computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0147] It should be noted that the storage medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any storage medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0148] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0149] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0150] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0151] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0152] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0153] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0154] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0155] Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. A method for controlling a distribution network fault recovery including a distributed power source, characterized in that: The steps include: Obtain distribution network fault information; Performing line protection and distributed power supply control based on the distribution network fault information; Acquire first voltage information of the distribution network, and determine first closing information based on the first voltage information; Synchronizing operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include voltage and frequency of the distributed power source; The second closing information is determined based on the operating parameters of the distributed power source.

2. The method for controlling a distribution network fault recovery including a distributed power source according to claim 1, characterized in that: The performing line protection based on the distribution network fault information includes: Determine the fault type based on the current and voltage waveforms recorded by the protection recorder; Constructing a reclosing time model based on the fault type; A reclosing time is determined based on the reclosing time model.

3. The method for controlling a distribution network fault recovery including a distributed power source according to claim 1, characterized in that: The controlling of the distributed power supply based on the distribution network fault information comprises: Performing ride-through control of distributed power sources based on the distribution network fault information; Based on the ride-through control, the operation mode of the distributed power source is judged. When the island operation mode is met, the distributed power source enters the island operation mode, and performs island division based on the load condition; Adjust the island operation strategy and switch the PQ control strategy to the network control strategy of the virtual synchronous generator VSG.

4. The method for controlling a distribution network fault recovery including a distributed power source according to claim 1, characterized in that: The synchronizing the operating parameters of the distributed power source based on the first closing information includes: Determine a synchronous closing judgment condition based on the first closing information; The operating parameters of the distributed power source are synchronized based on the synchronous closing judgment condition.

5. The method for controlling a distribution network fault recovery including a distributed power source according to claim 1, characterized in that: The determining the second closing information based on the operating parameters of the distributed power source includes: When the frequency and phase of the distributed power supply meet the closing judgment condition, the second closing information is determined.

6. The method for controlling a distribution network fault recovery including a distributed power source according to claim 3, characterized in that: The island division based on load conditions includes: Construct an optimization model that provides maximum load by weighting the load importance: Where: i is the weight of load i, and the load is divided into primary load, secondary load and tertiary load, and their weight coefficients are 10, 3 and 0.1 respectively; P Loadi is the active power of load i; i is the 0-1 state variable of load i, ξ i =0 means load i is removed, ξ i =1 means reserved load i; P DGj is the active power output of DGj; P 备用 For backup during island operation, 5% to 10% of the total DG power can be used.

7. The method for controlling a distribution network fault recovery including a distributed power source according to claim 1, characterized in that: The synchronous closing judgment condition is: line L voltage standard value U Line Higher than 0.7pu, the voltage per unit value deviation on both sides of the circuit breaker |U N -U Line |<0.2pu, voltage phase difference on both sides of the circuit breaker Voltage frequency deviation on both sides of the circuit breaker |f N -f Line |<0.5Hz, that is:

8. A distribution network fault recovery control device including a distributed power source, characterized in that: include: An acquisition module, used to obtain distribution network fault information; A protection control module, used for performing line protection and distributed power supply control based on the distribution network fault information; A first determining module, configured to obtain first voltage information of the distribution network, and determine first closing information based on the first voltage information; A synchronization module, configured to synchronize the operating parameters of the distributed power source based on the first closing information, wherein the operating parameters of the distributed power source include the voltage and frequency of the distributed power source; The second determining module is used to determine the second closing information based on the operating parameters of the distributed power source.

9. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the distribution network fault recovery control method including distributed power sources described in any one of claims 1 to 7 are implemented.

10. An electronic device, comprising at least a memory and a processor, wherein a computer program is stored in the memory, wherein: The processor implements the steps of the distribution network fault recovery control method including distributed power sources according to any one of claims 1 to 7 when executing the computer program on the memory.

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