A method for emergency repair and island prevention of new energy distribution network

Abstract

The present invention belongs to the technical field of emergency repair and island prevention of new energy distribution network, and relates to a method for emergency repair and island prevention of new energy distribution network. The present invention analyzes the operation risk indicators of each key node of the target distribution network, and then obtains each designated fault position of the target distribution network, judges whether the target distribution network has a fault, and obtains the specific location of the target distribution network at the same time, which is conducive to timely resolution, ensuring the stability and reliability of power supply, and automatically generates corresponding emergency repair measures and anti-islanding measures by obtaining each designated fault position of the target distribution network corresponding to each island distributed power source and each island-forming risk distributed power source, and automatically generates corresponding emergency repair measures and anti-islanding measures, which is helpful to timely discover and prevent the occurrence and risk of islanding phenomenon, avoid damage to the power grid and users, and also improve the robustness and resilience of the distribution network, which is conducive to providing targeted solutions and reducing the probability of islanding phenomenon.

Description

Technical Field

[0001] The invention belongs to the technical field of emergency repair and island prevention for a new energy distribution network, and relates to an emergency repair and island prevention method for a new energy distribution network. Background Art

[0002] With the rapid development of new energy, more and more distributed power sources are connected to the distribution network. The connection of these distributed power sources has brought about changes in the structure of the power system, which has increased the risk of islanding. The islanding phenomenon refers to the failure of some grid-connected power generation systems to disconnect from the main power grid in time when the distribution network fails or the power goes out, and they continue to supply power to the local power grid, forming an independent power system. The islanding phenomenon not only affects the safety of power maintenance personnel, but may also cause damage to surrounding electrical equipment, and even cause overload or failure of electrical equipment. Therefore, the anti-islanding system for the new energy distribution network during emergency repair is of great significance and role.

[0003] In the prior art, there are also some solutions related to anti-islanding during emergency repair of distribution networks. For example, the invention patent application of a method and device for anti-islanding of distributed power sources in a DC distribution network with a Chinese patent publication number of CN106159985B includes: injecting an AC voltage component into the output end of the AC / DC interface converter, wherein the frequency of the AC voltage component is less than the power frequency; sampling the first voltage signal at the output end of the DC / DC converter; extracting the first effective value of the AC signal in the first voltage signal; comparing the first effective value with the first preset voltage value; when it is determined that the first effective value is less than the first preset voltage value, the distributed power source has an islanding phenomenon, and the distributed power source is controlled to stop running. Detect whether the AC voltage component exists at the output end of the DC / DC converter, so as to determine whether the distributed power source should stop running. If the AC voltage component does not exist at the output end of the DC / DC converter, the distributed power source should be controlled to stop running, so as to timely and accurately determine whether there is an islanding phenomenon.

[0004] Although the above schemes have proposed some solutions for preventing islanding during emergency repairs of distribution networks, they still have certain limitations: on the one hand, the existing schemes are mainly aimed at judging the occurrence of islanding phenomena, but the existing schemes lack multi-dimensional analysis from the occurrence of islanding phenomena and the risks of occurrence, so that timely avoidance of islanding risks is impossible, and thus damage to the power grid and users cannot be more effectively avoided, nor can the robustness and resilience of the distribution network be more advantageously improved, so that it can better cope with various faults and abnormal situations.

[0005] On the other hand, the existing solutions also ignore the targeted emergency repair measures and anti-islanding measures based on the fault location of the distribution network and the possible islanding phenomenon, which cannot effectively shorten the emergency repair time and improve the emergency repair efficiency, and is not conducive to reducing the probability of islanding phenomenon and preventing the expansion and spread of faults. Summary of the invention

[0006] In view of this, in order to solve the problems raised in the above background technology, a method for emergency repair and anti-islanding of a new energy distribution network is proposed.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a new energy distribution network emergency repair and anti-islanding method, including: S1, distribution network operation analysis: used to record the detected distribution network as the target distribution network, and then perform real-time detection on the target distribution network, obtain the operating parameter information of each key node of the target distribution network, and analyze the operating risk indicators of each key node of the target distribution network.

[0008] S2. Distribution network fault analysis: Based on the operation risk indicators of each key node of the target distribution network, each key fault node of the target distribution network is obtained and recorded as each designated fault location of the target distribution network.

[0009] S3. Operation data collection: Perform real-time detection on each distributed power source corresponding to each designated fault location of the target distribution network, obtain the operation parameter data of each distributed power source corresponding to each designated fault location of the target distribution network, and extract the basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network from the cloud database.

[0010] S4. Operation data analysis: Analyze the island risk index correction factor of each distributed power source corresponding to each designated fault location of the target distribution network and the island risk index of each distributed power source corresponding to each designated fault location of the target distribution network, and then obtain each island distributed power source corresponding to each designated fault location of the target distribution network and each island-forming risk distributed power source.

[0011] S5. Automatic generation of measures: Based on each designated fault location of the target distribution network and its corresponding island distributed power sources and each island-forming risk distributed power source, emergency repair measures and anti-islanding measures for each designated fault location of the target distribution network are automatically generated.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention obtains the operating parameter information of each key node of the target distribution network, analyzes the operating risk indicators of each key node of the target distribution network, and then obtains each designated fault location of the target distribution network, judges whether a fault occurs in the target distribution network, and obtains the specific location of the fault in the target distribution network, which is conducive to timely resolution and ensures the stability and reliability of power supply.

[0013] 2. The present invention analyzes the island risk index correction factor of each distributed power source corresponding to each designated fault location of the target distribution network and the island risk index of each distributed power source corresponding to each designated fault location of the target distribution network, and then obtains each designated fault location of the target distribution network corresponding to each island distributed power source and each island-forming risk distributed power source, which helps to timely discover and prevent the occurrence and risk of islanding, avoid damage to the power grid and users, and also improves the robustness and resilience of the distribution network, enabling it to better cope with various faults and abnormal situations.

[0014] 3. The present invention automatically generates emergency repair measures and anti-islanding measures for each designated fault location of the target distribution network based on each designated fault location of the target distribution network and its corresponding island distributed power sources and risk distributed power sources formed by each island. The automatically generated emergency repair measures can provide targeted solutions for the specific fault location and cause, thereby shortening the emergency repair time, improving the emergency repair efficiency, and further reducing the probability of islanding. It can ensure the stable operation of the power grid in the event of a fault, prevent the expansion and spread of the fault, and thus improve the safety of the power grid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram for implementing the method steps of the present invention.

[0017] Figure 2 It is a schematic diagram of the steps of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1As shown, the present invention provides a new energy distribution network emergency repair and anti-islanding method, and the specific steps are as follows: S1, distribution network operation analysis: used to record the detected distribution network as the target distribution network, and then perform real-time detection on the target distribution network, obtain the operating parameter information of each key node of the target distribution network, and analyze the operating risk indicators of each key node of the target distribution network.

[0020] It needs to be further explained that the step implementation flow diagram is as follows Figure 2 shown.

[0021] As a preferred feasible embodiment, the operating parameter information of each key node of the target distribution network includes voltage, frequency and power factor.

[0022] It should be noted that the key nodes include but are not limited to distributed power access nodes, line support points and load concentration points.

[0023] It should be further explained that the reason for taking voltage, frequency and power factor as the operating parameter information of each key node of the target distribution network is: (1) Voltage is one of the key indicators for measuring power quality, which directly affects the operating effect of power equipment and the performance of power equipment. In the distribution network, the voltage level of each key node must be maintained within the specified range to ensure the normal operation of the power equipment.

[0024] (2) The frequency of the power grid depends on the supply and demand of the active load of the entire power grid. By monitoring the frequency level of key nodes, we can understand the operating status of the power grid and the load changes. Maintaining the frequency of the power grid within a stable range is crucial to maintaining the stability and efficiency of the power system. Frequency fluctuations may affect the operating results of power equipment and the performance of power equipment, and even cause equipment damage or power outages.

[0025] (3) Power factor is an indicator that measures the relationship between useful power and total power in a circuit. It reflects the efficiency of the power system in utilizing electric energy. By monitoring the power factor level of key nodes, we can understand the power utilization of the power system and take corresponding measures to improve the efficiency of power utilization.

[0026] It needs to be further explained that the specific method of obtaining the voltage, frequency and power factor of each key node of the target distribution network is: using a multi-function multimeter deployed at each key node of the target distribution network to directly measure the voltage, frequency and power factor of each key node of the target distribution network.

[0027] S2. Distribution network fault analysis: Based on the operation risk indicators of each key node of the target distribution network, each key fault node of the target distribution network is obtained and recorded as each designated fault location of the target distribution network.

[0028] As a preferred feasible embodiment, the operation risk index of each key node of the target distribution network is specifically analyzed by extracting the voltage, frequency and power factor of each key node of the target distribution network, which are recorded as ,in , is the number of each key node, is the number of key nodes, and the operation risk index of each key node of the target distribution network is analyzed ,in They are the first Standard voltage, standard frequency and minimum power factor of key nodes, They are the permissible difference between the set voltage and the standard voltage, and the permissible difference between the frequency and the standard frequency. is a natural constant.

[0029] It should be further explained that the allowable difference between the set voltage and the standard voltage and the allowable difference between the set frequency and the standard frequency may be 0.01 volt and 0.01 Hz respectively, which means that a deviation of one percent is allowed between the voltage and the standard voltage and between the frequency and the standard frequency.

[0030] As a preferred feasible embodiment, the specific acquisition method of each key fault node of the target distribution network includes: comparing the operation risk index of each key node of the target distribution network with the set operation risk index threshold value; if the operation risk index of a key node of the target distribution network is greater than or equal to the operation risk index threshold value, then the key node of the target distribution network is recorded as the key fault node of the target distribution network, thereby obtaining each key fault node of the target distribution network.

[0031] The present invention obtains the operating parameter information of each key node of the target distribution network, analyzes the operating risk indicators of each key node of the target distribution network, and then obtains each designated fault location of the target distribution network, judges whether a fault occurs in the target distribution network, and obtains the specific location of the fault in the target distribution network, which is conducive to timely resolution and ensures the stability and reliability of power supply.

[0032] S3. Operation data collection: Perform real-time detection on each distributed power source corresponding to each designated fault location of the target distribution network, obtain the operation parameter data of each distributed power source corresponding to each designated fault location of the target distribution network, and extract the basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network from the cloud database.

[0033] As a preferred feasible embodiment, the operating parameter data of each distributed power source corresponding to each designated fault location of the target distribution network includes a voltage fluctuation coefficient, a frequency fluctuation coefficient, a power fluctuation coefficient and a phase fluctuation coefficient.

[0034] It should be further explained that the voltage fluctuation coefficient, frequency fluctuation coefficient, power fluctuation coefficient and phase fluctuation coefficient are used as the operating parameter data of each distributed power source corresponding to each designated fault location of the target distribution network because: (1) The voltage fluctuation coefficient reflects the stability of the output voltage of the distributed power source. Excessive voltage fluctuation will affect the stable operation of the power system and may even cause equipment damage or power outages. Therefore, the voltage fluctuation coefficient is one of the important indicators for measuring the stability of the operation of distributed power sources.

[0035] (2) The frequency fluctuation coefficient reflects the frequency stability of the power output of the distributed power generation. Frequency is an important parameter of the power system. Frequency fluctuation will affect the synchronous operation and power quality of the power system. Therefore, the frequency fluctuation coefficient is also an important indicator to measure the stability of the operation of distributed power generation.

[0036] (3) The power fluctuation coefficient reflects the fluctuation of the output power of distributed power sources. Most distributed power sources use renewable natural energy, and their output power is easily affected by changes in external conditions. Excessive power fluctuations may cause power imbalance in the distribution network, thereby affecting the stable operation of the power system. Therefore, the power fluctuation coefficient is an important indicator for evaluating the impact of distributed power sources on the distribution network.

[0037] (4) The phase fluctuation coefficient reflects the phase stability of the output voltage of the distributed power generation. Phase fluctuation will affect the synchronization and stability of the power system, especially in the distribution network where multiple power sources operate in parallel. Phase fluctuation may lead to uneven distribution of current and power, thus affecting the stable operation of the power system.

[0038] It needs to be further explained that the specific method of obtaining the voltage fluctuation coefficient, frequency fluctuation coefficient, power fluctuation coefficient and phase fluctuation coefficient of each distributed power source corresponding to each designated fault location of the target distribution network is: using the deployed multifunctional power quality analyzer to perform real-time detection on each distributed power source corresponding to each designated fault location of the target distribution network, and obtain the voltage, frequency, power and phase of each distributed power source corresponding to each designated fault location of the target distribution network, and store them in the cloud database.

[0039] The voltage, frequency, power and phase of each detection of each distributed power source corresponding to each designated fault location of the target distribution network are further extracted from the cloud database and recorded as ,in , is the number of each specified fault location, is the number of specified fault locations, , is the number of each distributed power source, is the number of distributed generation sources, , is the number of each test, is the number of detections.

[0040] According to the analytical formula Get the voltage fluctuation coefficient of each distributed power source corresponding to each designated fault location of the target distribution network ,in is the set allowable fluctuation voltage.

[0041] According to the analytical formula Obtain the frequency fluctuation coefficient of each distributed power source corresponding to each designated fault location of the target distribution network ,in The permitted fluctuation frequency is set.

[0042] According to the analytical formula Get the power fluctuation coefficient of each distributed power source corresponding to each specified fault location of the target distribution network ,in is the set allowable fluctuating power.

[0043] According to the analytical formula Get the phase fluctuation coefficient of each distributed power source corresponding to each specified fault location of the target distribution network ,in is the set permissible fluctuation phase.

[0044] It should be further explained that the set allowable fluctuation voltage is 5% of the rated voltage.

[0045] The set permissible fluctuation frequency may be 0.2 Hz.

[0046] The set allowable fluctuation power may be 10% of the output power.

[0047] The set allowable fluctuation phase may be output phase ±2°.

[0048] As a specific example, (1) if the rated voltage of the power grid is 230 volts (V), the permissible voltage fluctuation range is: 218.5 V to 241.5 V. That is, 230×(1−0.05)=218.5 V to 230×(1+0.05)=241.5 V.

[0049] (2) If the rated frequency of the power grid is 50 Hz, the permissible fluctuation frequency range is: 50 ± 0.2 Hz, that is, 49.8 Hz to 50.2 Hz.

[0050] (3) If the rated output power of the distributed generation is 100 kW, the permissible fluctuating power range is: 90 kW to 110 kW, that is, 100×(1−0.10)=90 kW to 100×(1+0.10)=110 kW.

[0051] (4) If the rated phase angle of the power grid is 0°, the permissible fluctuation phase range is: 0°±2°, i.e., −2° to 2°.

[0052] The basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network includes the distance between the access location and the substation and the access line type.

[0053] It should be noted that the access line types include but are not limited to dedicated cable access, dedicated overhead line access, T-type cable access and T-type overhead line access.

[0054] It should be further explained that the reason for using the distance between the access location and the substation and the access line type as the basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network is: (1) The distance between the access location and the substation can intuitively reflect the relative position of the distributed power source in the distribution network. The different access locations of distributed power sources will directly affect the power flow distribution, voltage level and current flow direction of the distribution network during faults. For example, when the distributed power source is connected to a location close to the substation, its impact on the distribution network may be more significant because it may change the power flow distribution and voltage level in the area near the substation.

[0055] (2) The type of access line determines the connection method and electrical characteristics between the distributed generation and the distribution network. Different types of lines have different electrical parameters such as impedance, capacitance and inductance, which will affect the operating performance of the distributed generation in the distribution network and the current and voltage characteristics during faults.

[0056] It needs to be further explained that the specific method for obtaining the access position, substation distance and access line type of each distributed power source corresponding to each designated fault location of the target distribution network is: directly extracting the access position, substation distance and access line type of each key node of the target distribution network corresponding to each distributed power source from the distribution network archive data, and further screening to obtain the access position, substation distance and access line type of each distributed power source corresponding to each designated fault location of the target distribution network.

[0057] S4. Operation data analysis: Analyze the island risk index correction factor of each distributed power source corresponding to each designated fault location of the target distribution network and the island risk index of each distributed power source corresponding to each designated fault location of the target distribution network, and then obtain each island distributed power source corresponding to each designated fault location of the target distribution network and each island-forming risk distributed power source.

[0058] As a preferred feasible embodiment, each designated fault location of the target distribution network corresponds to an island risk index correction factor of each distributed power source, and the specific analysis method includes: extracting the access line type of each distributed power source corresponding to each designated fault location of the target distribution network, and matching it with the correction factor influence index corresponding to each access line type stored in the cloud database, so as to obtain the correction factor influence index corresponding to the access line type of each distributed power source corresponding to each designated fault location of the target distribution network. ,in , is the number of each specified fault location, is the number of specified fault locations, , is the number of each distributed power source, is the number of distributed generation sources.

[0059] Extract the access location and substation distance of each distributed generation corresponding to each designated fault location of the target distribution network .

[0060] Analyze the island risk index correction factor of each distributed generation corresponding to each designated fault location of the target distribution network ,in is the maximum distance between the access location of the distributed generation and the substation extracted from the cloud database.

[0061] As a preferred feasible embodiment, each designated fault location of the target distribution network corresponds to the island risk index of each distributed power source, and the specific analysis method includes: extracting the voltage fluctuation coefficient, frequency fluctuation coefficient, power fluctuation coefficient and phase fluctuation coefficient of each distributed power source corresponding to each designated fault location of the target distribution network, respectively recorded as , analyze the island risk index of each distributed power source corresponding to each designated fault location of the target distribution network ,in They are respectively the set voltage fluctuation coefficient threshold, frequency fluctuation coefficient threshold, power fluctuation coefficient threshold and phase fluctuation coefficient threshold.

[0062] As a preferred feasible embodiment, each designated fault location of the target distribution network corresponds to each isolated island distributed power source and each isolated island forms a risk distributed power source, and the specific acquisition method includes: matching the island risk index of each designated fault location of the target distribution network corresponding to each distributed power source with the island risk index range stored in the cloud database respectively; if the island risk index of a certain distributed power source corresponding to a certain designated fault location of the target distribution network is greater than the maximum value of the island risk index range, then the distributed power source corresponding to the designated fault location of the target distribution network is recorded as the island distributed power source corresponding to the designated fault location of the target distribution network.

[0063] If the island risk index of a distributed power source corresponding to a specified fault location of the target distribution network is less than or equal to the maximum value of the island risk index range and greater than the minimum value of the island risk index range, then the distributed power source corresponding to the specified fault location of the target distribution network is recorded as the distributed power source with island risk corresponding to the specified fault location of the target distribution network.

[0064] Then, each designated fault location of the target distribution network corresponds to each isolated island distributed power source and each isolated island forms a risk distributed power source.

[0065] The present invention analyzes the islanding risk index correction factor of each distributed power source corresponding to each designated fault location of the target distribution network and the islanding risk index of each distributed power source corresponding to each designated fault location of the target distribution network, and then obtains each designated fault location of the target distribution network corresponding to each islanded distributed power source and each island-forming risk distributed power source, which helps to timely discover and prevent the occurrence and risk of islanding, avoid damage to the power grid and users, and also improves the robustness and resilience of the distribution network, so that it can better cope with various faults and abnormal situations.

[0066] S5. Automatic generation of measures: Based on each designated fault location of the target distribution network and its corresponding island distributed power sources and each island-forming risk distributed power source, emergency repair measures and anti-islanding measures for each designated fault location of the target distribution network are automatically generated.

[0067] As a preferred feasible embodiment, the emergency repair measures for each designated fault location of the target distribution network are automatically generated, which specifically includes: extracting each designated fault location of the target distribution network and its corresponding isolated island distributed power sources and each isolated island-formed risk distributed power source, and automatically generating emergency repair measures for each designated fault location of the target distribution network based on this, wherein the emergency repair measures include fault location and isolation measures, equipment maintenance and replacement measures, and power supply restoration measures.

[0068] It needs to be further explained that the specific operation of automatically generating emergency repair measures for each designated fault location of the target distribution network according to each designated fault location of the target distribution network and its corresponding isolated island distributed power sources and isolated island-forming risk distributed power sources is: according to whether there are isolated island distributed power sources or isolated island-forming risk distributed power sources among the distributed power sources corresponding to each designated fault location of the target distribution network, the emergency repair measures for each designated fault location of the corresponding target distribution network are automatically generated.

[0069] It should be further explained that the fault location and isolation measures include but are not limited to: (1) Fault location, using fault indicators, smart meters and other equipment and fault location algorithms to determine the fault location. The fault indicator can be installed at the line branch points and key nodes of the distribution network. When a line fault occurs, the fault location is indicated by detecting current mutations, zero-sequence current and other signals.

[0070] (2) Fault isolation operation: After the fault location is determined, the fault area is isolated from the normally operating power grid by operating equipment such as circuit breakers and disconnectors.

[0071] The equipment maintenance and replacement measures include but are not limited to: (1) Distributed power equipment maintenance. For faults in distributed power equipment such as photovoltaic panels, wind turbines, and energy storage devices, professional technicians will inspect and repair them. The maintenance content includes checking whether the mechanical parts of the equipment are damaged, whether the electrical components are short-circuited or open-circuited, and whether the control system is normal.

[0072] (2) Repair and replacement of lines and other electrical equipment. Line failures may be caused by insulation damage, short circuit, broken wire, etc. For lines with damaged insulation, they need to be re-insulated. For short-circuited lines, the short-circuit point should be found and repaired. Broken wires need to be reconnected. For other electrical equipment, such as transformers and switch cabinets, they should be repaired or replaced accordingly according to the fault conditions.

[0073] The power restoration measures include but are not limited to: (1) gradually restoring power supply. After the fault is repaired, all equipment and lines cannot be put into operation immediately. Power supply needs to be restored gradually in a certain order. First, power supply to important users, such as hospitals and data centers, is restored, and then power supply to other users is gradually restored.

[0074] (2) Grid connection operation and coordination: If the distributed power source is to be reconnected to the grid, it is necessary to ensure that the voltage, frequency, phase and other parameters of the distributed power source are consistent with those of the grid. This needs to be achieved through inverter control or synchronous generator regulation. At the same time, attention should be paid to the power balance between the distributed power source and the grid to avoid power shocks causing grid failures again.

[0075] As a preferred feasible embodiment, the anti-islanding measures for each designated fault location of the target distribution network are automatically generated, which specifically includes: extracting each designated fault location of the target distribution network and its corresponding island distributed power sources and each island-forming risk distributed power source, and automatically generating anti-islanding measures for each designated fault location of the target distribution network based on this.

[0076] It needs to be further explained that the specific operation of automatically generating anti-islanding measures for each designated fault location of the target distribution network according to each designated fault location of the target distribution network and its corresponding each isolated distributed power source and each island-forming risk distributed power source is: according to whether there is an island distributed power source or an island-forming risk distributed power source among each distributed power source corresponding to each designated fault location of the target distribution network, the corresponding anti-islanding measures for each designated fault location of the target distribution network are automatically generated.

[0077] It should be further explained that the anti-islanding measures include but are not limited to: (1) checking whether the anti-islanding protection device is normal.

[0078] (2) Cut off the connection between the relevant distributed power sources and the fault line.

[0079] It should be explained that the anti-islanding device includes but is not limited to an anti-islanding protection device, inverter control, communication technology remote control, optimized distribution network topology and distributed power supply scheduling strategy.

[0080] As a preferred feasible embodiment, the method uses a cloud database during execution to store the standard voltage, standard frequency and minimum power factor of each key node of the target distribution network, store the correction factor influence index corresponding to each access line type, store the maximum distance between the access location of the distributed power source and the substation, and store the range of island risk indicators.

[0081] The present invention automatically generates emergency repair measures and anti-islanding measures for each designated fault location of the target distribution network based on each designated fault location of the target distribution network and its corresponding islanded distributed power sources and risk distributed power sources formed by each island. The automatically generated emergency repair measures can provide targeted solutions for the specific fault location and cause, thereby shortening the emergency repair time, improving the emergency repair efficiency, and further reducing the probability of the occurrence of the islanding phenomenon, which can ensure the stable operation of the power grid in the event of a fault, prevent the expansion and spread of the fault, and thus improve the safety of the power grid operation.

[0082] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A method for emergency repair and island prevention of a new energy distribution network, characterized in that: include: S1. Distribution network operation analysis: used to perform real-time detection on the target distribution network, obtain the operating parameter information of each key node of the target distribution network, and analyze the operating risk indicators of each key node of the target distribution network; S2. Distribution network fault analysis: Based on the above indicators, obtain each designated fault location of the target distribution network; S3, operation data collection: perform real-time detection on each distributed power source corresponding to the above-mentioned fault location, obtain corresponding operation parameter data, and extract basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network from the cloud database; S4. Operation data analysis: Analyze the island risk index correction factor of each distributed power source corresponding to each designated fault location of the target distribution network And the island risk index of each distributed generation corresponding to each designated fault location of the target distribution network , and then obtain the corresponding island distributed power sources and risk distributed power sources formed by each island at each designated fault location of the target distribution network; S5. Automatic generation of measures: Based on each designated fault location of the target distribution network and its corresponding islanded distributed power sources and each island-forming risk distributed power source, emergency repair measures and anti-islanding measures for each designated fault location of the target distribution network are automatically generated; The analysis method is: Extract the access line type corresponding to each distributed power source at each designated fault location of the target distribution network, match it with the correction factor influence index corresponding to each access line type stored in the cloud database, and obtain the correction factor influence index corresponding to the access line type of each distributed power source at each designated fault location of the target distribution network. , , is the number of each specified fault location, is the number of specified fault locations, , is the number of each distributed power source, is the number of distributed generation; Extract the access location and substation distance of each distributed generation corresponding to each designated fault location of the target distribution network ; Analyze the island risk index correction factor of each distributed generation corresponding to each designated fault location of the target distribution network , The maximum distance between the access location of the distributed generation and the substation extracted from the cloud database; The analysis method is: Extract the voltage fluctuation coefficient, frequency fluctuation coefficient, power fluctuation coefficient and phase fluctuation coefficient of each distributed power source corresponding to each specified fault location of the target distribution network, and record them as , analyze the island risk index of each distributed power source corresponding to each designated fault location of the target distribution network ,in They are respectively the set voltage fluctuation coefficient threshold, frequency fluctuation coefficient threshold, power fluctuation coefficient threshold and phase fluctuation coefficient threshold.

2. A new energy distribution network emergency repair and island prevention method according to claim 1, characterized in that: The operating parameter information of each key node of the target distribution network includes voltage, frequency and power factor; The operating parameter data of each distributed power source corresponding to each designated fault location of the target distribution network includes a voltage fluctuation coefficient, a frequency fluctuation coefficient, a power fluctuation coefficient and a phase fluctuation coefficient; The basic parameter data of each distributed power source corresponding to each designated fault location of the target distribution network includes the distance between the access location and the substation and the access line type.

3. A new energy distribution network emergency repair and island prevention method according to claim 2, characterized in that: The specific analysis method of the operation risk index of each key node of the target distribution network includes: The voltage, frequency and power factor of each key node of the target distribution network are extracted and recorded as ,in , is the number of each key node, is the number of key nodes, and the operation risk index of each key node of the target distribution network is analyzed ,in They are the first Standard voltage, standard frequency and minimum power factor of key nodes, They are the permissible difference between the set voltage and the standard voltage, and the permissible difference between the frequency and the standard frequency. is a natural constant.

4. A new energy distribution network emergency repair and island prevention method according to claim 3, characterized in that: The specific acquisition method of each designated fault location of the target distribution network includes: The operation risk index of each key node of the target distribution network is compared with the set operation risk index threshold. If the operation risk index of a key node of the target distribution network is greater than or equal to the operation risk index threshold, the key node of the target distribution network is recorded as the fault key node of the target distribution network, and then the fault key nodes of the target distribution network are obtained and recorded as the designated fault locations of the target distribution network.

5. A new energy distribution network emergency repair and island prevention method according to claim 1, characterized in that: Each designated fault location of the target distribution network corresponds to each isolated island distributed power source and each isolated island forming risk distributed power source, and the specific acquisition method includes: The islanding risk index of each distributed power source corresponding to each designated fault location of the target distribution network is matched with the islanding risk index range stored in the cloud database. If the islanding risk index of a distributed power source corresponding to a designated fault location of the target distribution network is greater than the maximum value of the islanding risk index range, the distributed power source corresponding to the designated fault location of the target distribution network is recorded as the islanded distributed power source corresponding to the designated fault location of the target distribution network; If the island risk index of a certain distributed power source corresponding to a certain designated fault position of the target distribution network is less than or equal to the maximum value of the island risk index range and greater than the minimum value of the island risk index range, then the designated fault position of the target distribution network corresponding to the distributed power source is recorded as the designated fault position of the target distribution network corresponding to the risk distributed power source of the island formation; Then, each designated fault location of the target distribution network corresponds to each isolated island distributed power source and each isolated island forms a risk distributed power source.

6. A new energy distribution network emergency repair and island prevention method according to claim 1, characterized in that: The automatic generation of emergency repair measures for each designated fault location of the target distribution network specifically includes: The designated fault locations of the target distribution network and their corresponding isolated island distributed power sources and risky distributed power sources are extracted, and emergency repair measures for the designated fault locations of the target distribution network are automatically generated based on them. The emergency repair measures include fault location and isolation measures, equipment maintenance and replacement measures, and power supply restoration measures.

7. A new energy distribution network emergency repair and island prevention method according to claim 6, characterized in that: The anti-islanding measures for each designated fault location of the target distribution network are automatically generated, which specifically include: The designated fault locations of the target distribution network and their corresponding islanded distributed power sources and risky distributed power sources forming islands are extracted, and anti-islanding measures for the designated fault locations of the target distribution network are automatically generated based on them.

8. A new energy distribution network emergency repair and island prevention method according to claim 1, characterized in that: During the execution of this method, a cloud database is used to store the standard voltage, standard frequency and minimum power factor of each key node of the target distribution network, store the correction factor influence index corresponding to each access line type, store the maximum distance between the access location of the distributed power source and the substation, and store the range of island risk indicators.

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