A reactive voltage control method and system, a terminal device and a storage medium

Abstract

The application relates to the field of power system control, in particular to a reactive power voltage control method and system, a terminal device and a storage medium. The method comprises the following steps: if there is an abnormal association between abnormal fault items, corresponding association inducing factors between the abnormal fault items are obtained, direct inducing factors and indirect inducing factors corresponding to the abnormal fault items are generated according to the inducing factor types of the association inducing factors in each abnormal fault item, and corresponding reactive power voltage control strategies of the abnormal fault items; if there is no abnormal association between the abnormal fault items, corresponding independent abnormal fault items are obtained; the control priority of the independent abnormal fault items is set according to the fault grades and fault inducing quantities of the independent abnormal fault items; and the reactive power voltage control strategies corresponding to the independent abnormal fault items are generated and executed according to the control priority. The reactive power voltage control method, system, terminal device and storage medium provided by the application can improve the efficiency of reactive power voltage control.

Description

Technical Field

[0001] This application relates to the field of power system control, and in particular to a reactive voltage control method, system, terminal equipment, and storage medium. Background Technology

[0002] Reactive power voltage control is a control method in power systems. It regulates the grid voltage by controlling the generator's excitation system to maintain a stable voltage level.

[0003] Voltage stability is crucial in power systems. Voltage fluctuations or unusual spikes in the grid can lead to instability, causing equipment damage and power outages. Therefore, AVC (Automatic Voltage Control) is an important means of ensuring stable power system operation. The main principle of AVC is to control the voltage through the generator's excitation system, adjusting the capacity of compensation capacitors and inductors to maintain the required voltage level. When the voltage drops, AVC automatically increases the excitation current to increase the voltage; conversely, when the voltage rises, AVC automatically decreases the excitation current to decrease the voltage.

[0004] In practical applications, power systems are often disturbed by factors such as wind power, solar power, mobile loads, and faults. These disturbances can affect the voltage and frequency of the power system. If the response speed of reactive voltage control is not fast enough or the control algorithm is not precise enough, control instability can easily occur. Summary of the Invention

[0005] To improve the efficiency of reactive voltage control, this application provides a reactive voltage control method, system, terminal equipment, and storage medium.

[0006] In a first aspect, this application provides a reactive power voltage control method, comprising the following steps: Obtain voltage data corresponding to the power system; If the voltage data does not meet the preset voltage control standard, then the abnormal fault item corresponding to the voltage data is obtained; If there are multiple abnormal fault items, then determine whether there is an abnormal correlation between the abnormal fault items; If there is an abnormal association among the abnormal fault items, then obtain the corresponding associated abnormal fault item; Obtain the associated triggering factors between the associated abnormal fault items, and generate direct triggering items and indirect triggering items corresponding to the associated abnormal fault items according to the triggering type of the associated triggering factors in each associated abnormal fault item; Based on the direct cause item and the indirect cause item, generate and execute the reactive voltage control strategy corresponding to the associated abnormal fault item; If there is no abnormal association between the abnormal fault items, then obtain the corresponding independent abnormal fault item; Based on the fault level and fault cause quantity corresponding to the independent abnormal fault item, the control priority corresponding to the independent abnormal fault item is set; Based on the control priority, the reactive voltage control strategy corresponding to the independent abnormal fault item is generated and executed.

[0007] By adopting the above technical solution, based on whether there is an abnormal correlation between abnormal fault items, a classification analysis is performed. This allows for specific analysis in conjunction with the actual abnormal situation of each abnormal fault item. If there is an abnormal correlation between abnormal fault items, reactive power and voltage control strategies are generated based on the direct and indirect causes that induced the associated abnormal fault items. If there is no abnormal correlation between abnormal fault items, a control priority that matches the processing efficiency of each independent abnormal fault item is generated based on its fault level and fault cause quantity. A corresponding reactive power and voltage control strategy is then generated based on this control priority. By performing correlation analysis on the abnormal fault items in the current power system and classifying the causes that induced the abnormal fault items according to their attributes, a reactive power and voltage control strategy more suitable for the current abnormal fault items is derived, thereby improving the reactive power and voltage control efficiency of the current power system.

[0008] Optionally, if the abnormal correlation exists among the abnormal fault items, the step of obtaining the corresponding associated abnormal fault item further includes the following steps: Obtain the historical matching rate between the associated abnormal fault items; If the historical matching rate does not meet the preset anomaly calibration standard, then obtain the triggering record of the associated triggering factor corresponding to the associated anomaly fault item; Obtain the association level and occurrence frequency of the associated triggering factors in the triggering records; Based on the association level and the frequency of triggering, a control ranking table is formed corresponding to the association triggering factors.

[0009] By adopting the above technical solution, if the historical matching rate between associated abnormal fault items meets the preset abnormal calibration standard, it means that the associated abnormal fault items have occurred multiple times in the past. In order to control them more efficiently, a corresponding control sorting table is formed according to the association level and triggering frequency of the associated abnormal fault items. Based on the control sorting table, the current associated abnormal fault items can be effectively controlled with a focus, thereby improving the reactive power and voltage control efficiency of the current power system.

[0010] Optionally, the step of forming a control ranking table corresponding to the associated triggering factors based on the association level and triggering frequency includes the following steps: Obtain the number of abnormal associations corresponding to the aforementioned inducing factors; Based on the number of abnormal associations and the control recovery rate corresponding to the number of abnormal associations, the association level corresponding to the association inducing factor is set. Based on the association level and the triggering frequency, a control ranking table corresponding to the association triggering factors is formed.

[0011] By adopting the above technical solution, and further combining the number of abnormal correlations and their corresponding control recovery rates, the correlation level corresponding to the correlation inducing factors is comprehensively set, which improves the accuracy of judging the corresponding abnormal conditions of the correlation inducing factors in the current power system, thereby improving the execution efficiency of reactive power and voltage control strategies.

[0012] Optionally, generating and executing the reactive voltage control strategy corresponding to the associated abnormal fault item based on the direct cause item and the indirect cause item includes the following steps: Based on the direct cause item, generate the main voltage regulation scheme for the associated abnormal fault item; Based on the indirect cause item, obtain the elimination scheme corresponding to the direct cause item; Combining the voltage stabilization master scheme and the anomaly elimination slave scheme, the reactive voltage control strategy corresponding to the associated abnormal fault item is generated, and the reactive voltage control strategy is executed.

[0013] By adopting the above technical solutions, and further controlling and processing the associated abnormal fault items according to the specific voltage stabilization master scheme and the abnormal elimination slave scheme in the reactive voltage control strategy, the effect of abnormal handling of associated abnormal fault items can be improved.

[0014] Optionally, after combining the voltage stabilization master scheme and the anomaly elimination slave scheme to generate the reactive voltage control strategy corresponding to the associated abnormal fault item, and executing the reactive voltage control strategy, the following steps are further included: Obtain the voltage regulation rate corresponding to the master voltage regulation scheme and the rejection rate corresponding to the slave voltage rejection scheme in the reactive voltage control strategy; By combining the voltage regulation rate and the rejection rate, a control feedback report corresponding to the reactive voltage control strategy is generated.

[0015] By adopting the above technical solution, the control feedback report enables relevant personnel to more intuitively grasp the dynamic information on the handling of associated abnormal fault items, thereby effectively improving the stability control effect of the current power system.

[0016] Optionally, setting the control priority corresponding to the independent abnormal fault item based on the fault level and fault cause quantity of the independent abnormal fault item includes the following steps: According to the preset fault calibration specification, obtain the fault level corresponding to the independent abnormal fault item; Based on the fault level, the initial control priority corresponding to the independent abnormal fault item is set; If there are identical initial control priorities, then the corresponding control priority is set according to the fault cause quantity of the corresponding target independent abnormal fault item, and the fault cause quantity is proportional to the control priority.

[0017] By adopting the above technical solution and setting the control priority for independent abnormal fault items based on their fault level and actual fault cause quantity, the control and processing efficiency for independent abnormal fault items with relatively high abnormal impact can be improved.

[0018] Optionally, if there are identical initial control priorities, then setting a corresponding control priority based on the fault cause quantity of the corresponding target independent abnormal fault item, wherein the fault cause quantity is proportional to the control priority, includes the following steps: If the same initial control priority exists, then determine whether the fault cause quantity corresponding to the target independent abnormal fault item is the same; If the number of fault causes corresponding to the target independent abnormal fault items is the same, then the proportion of the dominant cause in the number of fault causes is obtained, and the control priority corresponding to the target independent abnormal fault item is set according to the proportion of the dominant cause.

[0019] By adopting the above technical solution, the control priority of the target independent abnormal fault item is further set according to the proportion of the dominant cause in the fault cause quantity. Then, the target independent abnormal fault items with a higher proportion of dominant cause can be selectively processed first, thereby improving the control and processing efficiency of independent abnormal fault items.

[0020] Secondly, this application provides a reactive power voltage control system, comprising: The data acquisition module is used to acquire voltage data corresponding to the power system. An abnormal fault acquisition module is used to acquire the abnormal fault item corresponding to the voltage data if the voltage data does not meet the preset voltage control standard. The correlation analysis module is used to determine whether there is an abnormal correlation between the abnormal fault items if there are multiple abnormal fault items. The associated anomaly acquisition module is used to acquire the corresponding associated anomaly fault item if there is an anomaly association between the anomaly fault items. The association trigger generation module is used to obtain the association triggering factors corresponding to the association abnormal failure items, and generate direct triggering items and indirect triggering items corresponding to the association abnormal failure items according to the triggering type of the association triggering factors in each association abnormal failure item. The first strategy generation module is used to generate and execute the reactive voltage control strategy corresponding to the associated abnormal fault item based on the direct cause item and the indirect cause item. The independent anomaly acquisition module is used to acquire the corresponding independent anomaly fault item if there is no anomaly association between the anomaly fault items. The priority setting module is used to set the control priority corresponding to the independent abnormal fault item according to the fault level and fault cause quantity corresponding to the independent abnormal fault item. The second strategy generation module generates and executes the reactive voltage control strategy corresponding to the independent abnormal fault item according to the control priority.

[0021] By adopting the above technical solution, the correlation analysis module determines whether there is an abnormal correlation between abnormal fault items, and then performs classification analysis. This allows for specific analysis based on the actual abnormal situation of the abnormal fault items. If the correlation anomaly acquisition module determines that there is an abnormal correlation between abnormal fault items, the first strategy generation module generates reactive voltage control strategies for anomaly classification control based on the direct and indirect causes that induced the associated abnormal fault items. If the independent anomaly acquisition module determines that there is no abnormal correlation between abnormal fault items, the priority setting module generates control priorities that conform to the processing efficiency of the independent abnormal fault items based on the fault level and fault cause quantity corresponding to the independent abnormal fault items. The second strategy generation module then generates corresponding reactive voltage control strategies based on these control priorities. By performing correlation analysis on the abnormal fault items in the current power system and classifying the causes that induced the abnormal fault items according to their attributes, a reactive voltage control strategy more suitable for the current abnormal fault items is derived, thereby improving the reactive voltage control efficiency of the current power system.

[0022] Thirdly, this application provides a terminal device, which adopts the following technical solution: A terminal device includes a memory and a processor. The memory stores computer instructions that can be executed on the processor. When the processor loads and executes the computer instructions, it employs the aforementioned reactive voltage control method.

[0023] By adopting the above technical solution, a reactive voltage control method is used to generate computer instructions, which are then stored in a memory for loading and execution by a processor. This allows for the creation of terminal devices based on the memory and processor, making them convenient to use.

[0024] Fourthly, this application provides a computer-readable storage medium, which adopts the following technical solution: A computer-readable storage medium storing computer instructions, wherein when the computer instructions are loaded and executed by a processor, the aforementioned reactive voltage control method is employed.

[0025] By adopting the above technical solution, the above reactive voltage control method generates computer instructions and stores them in a computer-readable storage medium for loading and execution by the processor. The computer-readable storage medium facilitates the reading and storage of computer instructions.

[0026] In summary, this application includes at least one of the following beneficial technical effects: Based on whether there is an abnormal correlation between abnormal fault items, a classification analysis is performed, allowing for specific analysis in conjunction with the actual abnormal situation of each abnormal fault item. If there is an abnormal correlation between abnormal fault items, a reactive power and voltage control strategy for abnormal classification control is generated based on the direct and indirect causes that induce the associated abnormal fault items. If there is no abnormal correlation between abnormal fault items, a control priority that conforms to the processing efficiency of the independent abnormal fault item is generated based on the fault level and fault cause quantity corresponding to the independent abnormal fault item, and a corresponding reactive power and voltage control strategy is generated based on this control priority. By performing correlation analysis on the abnormal fault items existing in the current power system and classifying the causes that induce the abnormal fault items according to their attributes, a reactive power and voltage control strategy more suitable for the current abnormal fault items is derived, thereby improving the reactive power and voltage control efficiency of the current power system. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating steps S101 to S109 of a reactive voltage control method according to this application.

[0028] Figure 2 This is a flowchart illustrating steps S201 to S204 of a reactive voltage control method according to this application.

[0029] Figure 3 This is a flowchart illustrating steps S301 to S303 in a reactive voltage control method according to this application.

[0030] Figure 4 This is a flowchart illustrating steps S401 to S403 of a reactive voltage control method according to this application.

[0031] Figure 5 This is a flowchart illustrating steps S501 to S502 in a reactive voltage control method according to this application.

[0032] Figure 6 This is a flowchart illustrating steps S601 to S603 of a reactive voltage control method according to this application.

[0033] Figure 7 This is a flowchart illustrating steps S701 to S702 in a reactive voltage control method according to this application.

[0034] Figure 8 This is a schematic diagram of a reactive voltage control system according to this application.

[0035] Explanation of reference numerals in the attached figures: 1. Data acquisition module; 2. Anomaly and fault acquisition module; 3. Correlation analysis module; 4. Correlation anomaly acquisition module; 5. Correlation cause generation module; 6. First strategy generation module; 7. Independent anomaly acquisition module; 8. Priority setting module; 9. Second strategy generation module. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0037] This application discloses a reactive power voltage control method, such as... Figure 1 As shown, it includes the following steps: S101. Obtain the voltage data corresponding to the power system; S102. If the voltage data does not meet the preset voltage control standard, then obtain the abnormal fault item corresponding to the voltage data; S103. If there are multiple abnormal fault items, determine whether there is an abnormal correlation between the abnormal fault items; S104. If there is an abnormal association between abnormal fault items, then obtain the corresponding associated abnormal fault item; S105. Obtain the associated triggering factors between related abnormal fault items, and generate direct triggering items and indirect triggering items corresponding to the related abnormal fault items according to the triggering type of the associated triggering factors in each related abnormal fault item. S106. Generate and execute reactive voltage control strategies corresponding to associated abnormal fault items based on direct and indirect causal items; S107. If there is no abnormal association between abnormal fault items, then obtain the corresponding independent abnormal fault item; S108. Set the control priority corresponding to the independent abnormal fault item according to the fault level and fault cause quantity. S109. Generate and execute reactive voltage control strategies corresponding to independent abnormal fault items based on control priority.

[0038] In step S101, the voltage data includes, but is not limited to, the phase voltage, line voltage, average voltage, highest voltage, lowest voltage, voltage signal period, and harmonic components in the voltage signal of the current power system. The voltage data can be acquired in real time through power monitoring equipment or smart grid terminal equipment installed in the power system.

[0039] In step S102, the preset voltage control standard refers to a technical standard that sets reasonable voltage control strategies and related equipment in the power system to maintain the voltage of each node in the power grid within a specified range and to make timely adjustments according to changes in electricity load, thereby meeting user needs and power quality requirements. This standard includes aspects such as voltage control objectives, dispatching methods, equipment requirements, and monitoring methods.

[0040] Among them, abnormal fault items refer to the fault categories caused when the current voltage data does not conform to the preset voltage control standard. For example, in a power system, the set reactive voltage control standard is 230kV. If the voltage is detected to be lower than 230kV at a certain moment, the reactive voltage control system will automatically obtain the abnormal fault items corresponding to the current point voltage being lower than 230kV. These abnormal fault items include: transmission line faults, transformer damage, capacitor faults, etc.

[0041] For example, improper reactive power control of wind turbines can lead to excessive reactive current injection into the grid, causing voltage anomalies; mismatch in electrical parameters between wind turbines and the grid, or rapid changes in grid electrical parameters, can also cause voltage anomalies; grid faults, such as short circuits or open circuits, can lead to grid voltage anomalies; faults in reactive power compensation equipment, such as reactive capacitor failures or untimely switching, can result in insufficient or excessive reactive power capacity in the grid, thus causing voltage anomalies; excessively long transmission lines or transmission line faults within the wind farm can cause grid voltage anomalies; faults or erroneous operation of the control system of wind farm equipment can cause abnormal reactive current output from wind turbines, thus causing voltage anomalies; and faults in the transmission system of wind turbines, such as gearbox or bearing failures, can affect the power generation efficiency and stability of the wind turbine, thereby causing voltage anomalies.

[0042] It should be noted that all the abnormal faults mentioned above can be handled through reactive power regulation. For example, problems such as voltage fluctuations, voltage flicker, voltage harmonics, voltage imbalance, voltage peaks, and voltage frequency deviations in the power system can be addressed by reactive power regulation to restore the power system to normal. Reactive power regulation can adjust the distribution of reactive power in the power system to control the stability and quality of the system voltage, ensuring the normal operation of the power system.

[0043] Specifically, reactive power regulation can be achieved in the following ways: reactive generator control, which adjusts the reactive power at the generator end to control the voltage stability of the power system; capacitor compensation, which adds capacitor compensators to the power system to adjust the reactive power distribution in the system to control voltage stability; and STATCOM control, where a STATCOM is a static var generator that can control the voltage stability of the power system by adjusting its output reactive power.

[0044] Furthermore, if the voltage data meets the preset voltage control standard, the power system continues to collect and acquire voltage data and analyze it in real time.

[0045] In steps S103 to S104, if multiple abnormal fault items are detected in the current power system, in order to conduct in-depth analysis of the multiple abnormal fault items and to better control and process them, it is determined whether there is an abnormal correlation between the above-mentioned abnormal fault items. If there is, the multiple abnormal fault items are marked as associated abnormal fault items.

[0046] The following methods can be used for anomaly correlation analysis: Observe the scope of the fault's impact. If multiple faults affect overlapping equipment or areas, they may be caused by the same reason, which means there is an anomaly correlation. The overlapping areas of multiple faults can be analyzed together. Determine the characteristics of the fault. Different types of faults have different characteristics. By analyzing the voltage, current, and other data of the fault, it can be determined whether the faults are of the same type. If they are of the same type, it can be determined that there is an anomaly correlation between the abnormal fault items.

[0047] For example, if power system testing reveals that the generator's reactive power output is too low and the capacitive compensation capacitor of the grid-connected substation is faulty, it can be determined that there is an abnormal correlation between the two abnormal fault items. Since the failure of the capacitive compensation capacitor of the grid-connected substation will affect the generator's reactive power output, thus causing the generator's reactive power output to be too low, the generator's reactive power output and the capacitive compensation capacitor failure of the grid-connected substation are marked as related abnormal fault items.

[0048] Furthermore, if the current abnormal fault item is determined to be a single one, then the abnormal fault item is directly tracked to obtain its real-time data and match it with the appropriate reactive power and voltage control strategy.

[0049] In steps S105 and S106, the associated triggering factor refers to a factor or condition that triggers the occurrence of associated abnormal fault items. These factors may be related to load changes, fault occurrences, equipment failures, etc., in the power system. They can cause multiple abnormal fault items to occur simultaneously or influence each other, thereby negatively impacting the stability and security of the power system. For example, a power system may contain multiple capacitor banks, which may simultaneously experience abnormal faults such as capacitor core saturation and excessively high capacitor temperatures when the load changes. The occurrence of these abnormal faults is often associated with load changes. Therefore, load changes are a possible associated triggering factor. In addition, other possible associated triggering factors include voltage fluctuations, frequency changes, and electromagnetic interference in the power system.

[0050] Secondly, direct causes refer to problems or factors that directly lead to the occurrence of associated abnormal faults, while indirect causes are problems or factors that indirectly affect the occurrence of associated abnormal faults. For example, a direct cause might be overload operation, which leads to equipment overload and consequently poor reactive power and voltage control. Another indirect cause might be changes in power load, which cause fluctuations in power load, leading to changes in system voltage and thus affecting the effectiveness of reactive power and voltage control.

[0051] Furthermore, in order to perform more standardized reactive power and voltage control processing on the current associated abnormal fault items, a reactive power and voltage control strategy corresponding to the associated abnormal fault items is generated and executed based on the direct and indirect cause items in the associated abnormal fault items.

[0052] Specifically, when formulating reactive power and voltage control strategies, various factors need to be considered, such as system capacity, voltage setpoint, and the operating status of AC and DC generators. This will help improve the fault handling efficiency of the power system.

[0053] For example, if the associated abnormal fault items are generator excitation fault and transformer overload, the direct cause is the generator excitation fault leading to a drop in system voltage. The corresponding reactive voltage control strategy is to increase the generator's excitation current through reactive voltage control. The indirect cause is transformer overload, which is not suitable for regulation through reactive voltage control. In this case, the system will generate an additional reactive voltage control strategy based on the actual transformer overload situation. This strategy involves increasing the output signal of the VAR controller to cause the transformer to absorb more reactive current, thereby reducing the output power and achieving the regulation effect. Then, combining the processing strategies for the direct and indirect causes, a corresponding reactive voltage control strategy is generated.

[0054] In steps S107 to S109, if there is no abnormal correlation between abnormal fault items, it indicates that there is no abnormal correlation disturbance between the current abnormal fault items. To further analyze the current independent abnormal fault items, the control priority corresponding to the independent abnormal fault items is set according to the fault level and fault inducing factors. The fault level refers to the importance of the fault to the operation of the power system. Conventionally, fault levels are divided into three categories: high, medium, and low. Fault inducing factors refer to the main causes or factors that trigger the fault. For example, the inducing factors for capacitor bank damage might be long service life of the capacitor bank, capacitor aging, etc.

[0055] Furthermore, control priority refers to the reactive power and voltage control adjustment priority set according to the fault level and fault cause quantity corresponding to the independent abnormal fault item. Specifically, the higher the fault level and the greater the fault cause quantity corresponding to the independent abnormal fault item, the higher the control priority of the independent abnormal fault item. The system then generates and executes the reactive power and voltage control strategy corresponding to the independent abnormal fault item based on the control priority generated above.

[0056] The reactive power and voltage control method provided in this embodiment analyzes the correlation between abnormal fault items to determine if they are related. This allows for more specific analysis based on the actual abnormal conditions of each fault item. If a correlation exists, reactive power and voltage control strategies are generated based on the direct and indirect causes that led to the correlation. If no correlation exists, control priorities are generated based on the fault level and cause quantity of each independent fault item, aligning with the processing efficiency of that independent fault item. A corresponding reactive power and voltage control strategy is then generated based on this priority. By performing correlation analysis on the abnormal fault items in the current power system and classifying the causes that led to the abnormal fault items according to their attributes, a more suitable reactive power and voltage control strategy is derived, thereby improving the reactive power and voltage control efficiency of the current power system.

[0057] In one embodiment of this example, such as Figure 2 As shown, after obtaining the corresponding associated abnormal fault items in step S104, the following steps are also included: S201. Obtain the historical matching rate between associated abnormal fault items; S202. If the historical matching rate does not meet the preset anomaly calibration standard, then obtain the triggering record of the associated triggering factor corresponding to the associated anomaly fault item; S203. Obtain the association level and frequency of triggering factors in the triggering records; S204. Based on the association level and the frequency of triggering, form a control ranking table corresponding to the associated triggering factors.

[0058] In step S201, the historical matching rate refers to the ratio of the number of times the same associated fault items occurred simultaneously in the past to the total number of faults. For example, the current associated abnormal fault items are capacitor bank damage and low transformer oil level. That is, capacitor bank damage will lead to a decrease in the capacitance of the power system, which may cause undervoltage faults; at the same time, warning signals such as capacitor bank overheating may be generated before capacitor bank damage, and low transformer oil level will also lead to capacitor bank damage in the power system.

[0059] Furthermore, the historical matching rate corresponding to capacitor bank damage and low transformer oil level can be obtained from the system anomaly log. That is, if the number of times both failures occurred simultaneously is 3 and the total number of power system failures is 6, then the historical matching rate corresponding to capacitor bank damage and low transformer oil level is 50%.

[0060] In steps S202 to S204, the preset anomaly calibration standard refers to the safe frequency of simultaneous occurrence of the same associated fault items in the power system. If the historical matching rate between associated fault items does not meet the preset anomaly calibration standard, it indicates that the associated fault items may be the dominant cause of system anomalies. Therefore, to further analyze the aforementioned associated fault items, the triggering records of their corresponding associated triggering factors are obtained. These triggering factors refer to the factors that cause correlations between different fault items in the associated anomaly fault items, and the triggering records contain specific data information of the associated triggering factors.

[0061] Furthermore, if the historical matching rate meets the preset anomaly calibration standard, the system continues to collect and record the frequency of occurrence of various related anomaly fault items in real time.

[0062] Furthermore, to conduct in-depth analysis of the associated triggering factors, the association level and triggering frequency corresponding to the associated triggering factors in the triggering records are obtained. The association level refers to the degree of influence of the associated triggering factor on the associated abnormal fault item, and the triggering frequency refers to the frequency with which the associated triggering factor affects the associated abnormal fault item. For example, in the associated abnormal fault items of capacitor bank damage and low transformer oil level, the factors causing the correlation between different fault items may be environmental factors, equipment aging, etc. Therefore, when obtaining the triggering records, it is necessary to record the association level and triggering frequency corresponding to these associated triggering factors.

[0063] Secondly, a control priority table can be formed based on the correlation level and frequency of the associated inducing factors. This priority table can be used to optimize the control strategy of the reactive power and voltage control system, and to prioritize different associated abnormal fault items. For example, for associated abnormal fault items with a greater impact and higher frequency of occurrence, a higher control priority should be set, and faster control should be implemented when the fault occurs; while for associated abnormal fault items with a smaller impact and lower frequency of occurrence, the control requirements can be appropriately relaxed, and intervention should only be carried out when necessary.

[0064] The reactive power and voltage control method provided in this embodiment indicates that if the historical matching rate between associated abnormal fault items meets the preset abnormal calibration standard, it means that the associated abnormal fault items have occurred multiple times in the past. In order to control them more efficiently, a corresponding control sorting table is formed according to the association level and triggering frequency of the associated abnormal fault items. Based on the control sorting table, the current associated abnormal fault items can be effectively controlled with a focus, thereby improving the reactive power and voltage control efficiency of the current power system.

[0065] In one embodiment of this example, such as Figure 3 As shown, step S204, which involves forming a control ranking table corresponding to the associated triggering factors based on the association level and triggering frequency, includes the following steps: S301. Obtain the number of abnormal associations corresponding to the association triggering factors; S302. Based on the number of abnormal associations and the control recovery rate corresponding to the number of abnormal associations, set the association level corresponding to the association inducing factors; S303. Based on the association level and the frequency of triggering, form a control ranking table corresponding to the associated triggering factors.

[0066] In step S301, some associated triggering factors may cause reactive power voltage control failure or abnormality, endangering the safe and stable operation of the power system. Therefore, it is necessary to monitor and control these associated triggering factors to ensure the reliable operation of the power system.

[0067] The number of abnormal correlations refers to the number of associated faults in the power system caused by a single inducing factor. For example, if the inducing factor is the substation load, the power system faults it causes include voltage deviation, overvoltage, thermal runaway, and transient faults, then the current number of abnormal correlations is 4.

[0068] In steps S302 to S303, the control recovery rate refers to the ratio of the recovery amount corresponding to the associated abnormal faults to the number of abnormal associations after reactive power and voltage control regulation. For example, after reactive power and voltage control regulation, the voltage deviation and overvoltage faults corresponding to the substation load are restored and operate normally, while thermal runaway and transient faults are not effectively restored and remain in fault condition. Therefore, the control recovery rate corresponding to the substation load is 50%.

[0069] Furthermore, by combining the number of abnormal associations of the inducing factors and the control recovery rate corresponding to the number of abnormal associations, an association level corresponding to the inducing factors is set. It should be noted that the more inducing factors there are or the lower the control recovery rate corresponding to the number of abnormal associations, the higher the association level corresponding to the inducing factors.

[0070] Secondly, based on the aforementioned determination of the correlation levels of the associated triggering factors, and combined with the triggering frequency of these factors, a control ranking table is formed corresponding to each factor. For example, if the substation load has the highest triggering frequency and correlation level, then the substation load is placed at the top of the control ranking table for priority monitoring and control, ensuring the reliable operation of the power system.

[0071] The reactive voltage control method provided in this embodiment further combines the number of abnormal correlations and their corresponding control recovery rates to comprehensively set the correlation level corresponding to the correlation inducing factors, thereby improving the accuracy of judging the corresponding abnormal conditions of the correlation inducing factors in the current power system and thus improving the execution efficiency of the reactive voltage control strategy.

[0072] In one embodiment of this example, such as Figure 4 As shown, step S106, which generates and executes the reactive voltage control strategy corresponding to the associated abnormal fault item based on the direct and indirect causative factors, includes the following steps: S401. Generate a main voltage regulation scheme based on the direct cause items and related abnormal fault items; S402. Based on the indirect cause item, obtain the elimination scheme for the corresponding direct cause item; S403. Combining the main voltage stabilization scheme and the auxiliary fault elimination scheme, generate the reactive voltage control strategy corresponding to the associated abnormal fault item, and execute the reactive voltage control strategy.

[0073] In practical applications, direct and indirect causes in reactive power voltage control influence each other. Direct causes are the primary reasons for faults, such as capacitor failures and transformer wiring problems. Indirect causes are secondary reasons that lead to direct causes, such as grid voltage fluctuations and load changes. When a fault occurs, direct causes directly affect the stability and accuracy of reactive power voltage control, while indirect causes affect the probability and severity of the direct causes. Therefore, in reactive power voltage control, both direct and indirect causes need to be considered simultaneously to improve the reliability and robustness of the control system.

[0074] In step S401, the main voltage stabilization scheme refers to the main reactive power and voltage control and regulation scheme formulated based on the direct causes in the power system. For example, if the direct cause is frequency deviation, the corresponding associated abnormal faults are insufficient reactive power and voltage fluctuation. Further generating the corresponding main voltage stabilization scheme includes: for insufficient reactive power, reactive power compensation technology can be used, i.e., by adding capacitors or inductors to the grid to supply reactive power to the grid; for voltage fluctuation, voltage regulation technology can be used. This technology controls voltage by adjusting power quality equipment and transformers in the grid. The voltage regulator can automatically adjust according to changes in grid load to maintain voltage stability in the grid.

[0075] In step S402, the anomaly mitigation scheme refers to the subsequent stability adjustment scheme formulated for direct causes in the power system. For example, an indirect cause is load fluctuation, which is an indirect cause of frequency deviation. The corresponding anomaly mitigation scheme can take measures to reduce the impact of load fluctuation. For example, using appropriate voltage regulators, improving the design of power supply equipment, and reducing the number and fluctuation of loads.

[0076] In step S403, the reactive power and voltage control strategy corresponding to the associated abnormal fault item is generated by combining the determined voltage stabilization master scheme and the anomaly elimination slave scheme. It should be noted that the reactive power and voltage control strategy mainly prioritizes the voltage stabilization master scheme, the purpose of which is to promptly handle the current power system faults. The anomaly elimination slave scheme can be implemented as a post-fault maintenance scheme for the current fault.

[0077] The reactive voltage control method provided in this embodiment further controls and processes associated abnormal fault items according to the specific voltage stabilization master scheme and the anomaly elimination slave scheme in the reactive voltage control strategy, which can improve the effect of abnormal handling of associated abnormal fault items.

[0078] In one embodiment of this example, such as Figure 5 As shown, after step S403, which combines the main voltage stabilization scheme and the auxiliary fault elimination scheme to generate the reactive voltage control strategy corresponding to the associated abnormal fault item and execute the reactive voltage control strategy, the following steps are also included: S501. Obtain the voltage regulation rate corresponding to the main voltage regulation scheme and the rejection rate corresponding to the slave rejection scheme in the reactive voltage control strategy; S502. Combine the voltage regulation rate and the rejection rate to generate a control feedback report corresponding to the reactive voltage control strategy.

[0079] In steps S501 to S502, to determine the effectiveness of the reactive voltage control strategy, its voltage regulation rate and anomaly suppression rate can be further analyzed. Voltage regulation rate refers to the stability of the grid voltage after applying the main voltage regulation scheme. Anomaly suppression rate refers to the reduction in asynchronous current in the system after applying the slave anomaly suppression scheme.

[0080] Furthermore, when generating control feedback reports by combining the voltage regulation rate and the rejection rate, appropriate feedback strategies can be generated based on the specific circumstances of the power system to further improve system stability and reliability. These feedback strategies can include measures related to grid management and control system optimization to ensure system operating efficiency and safety. Therefore, obtaining the voltage regulation rate and rejection rate from the reactive power and voltage control strategy, and generating reports in conjunction with the corresponding control feedback strategies, can effectively improve the stability and reliability of the power system, reduce the system failure rate, and reduce energy waste.

[0081] The reactive power and voltage control method provided in this embodiment allows relevant personnel to more intuitively grasp the dynamic information of the handling of associated abnormal fault items based on the control feedback report, thereby effectively improving the stability control effect of the current power system.

[0082] In one embodiment of this example, such as Figure 6 As shown, step S108, which sets the control priority corresponding to an independent abnormal fault item based on the fault level and fault cause quantity, includes the following steps: S601. Obtain the fault level corresponding to the independent abnormal fault item according to the preset fault calibration specification; S602. Set the initial control priority for independent abnormal fault items according to the fault level; S603. If there are identical initial control priorities, the corresponding control priority shall be set according to the fault cause quantity of the corresponding target independent abnormal fault item, and the fault cause quantity shall be proportional to the control priority.

[0083] In steps S601 and S602, the preset fault calibration specification refers to the fault level judgment specification pre-set for independent abnormal fault items in the power system. By comparing and analyzing the independent abnormal fault item with its corresponding preset fault calibration specification, the fault level corresponding to the independent abnormal fault item can be further obtained. The fault levels specified in the preset fault calibration specification are divided into Level 1, Level 2, and Level 3 faults. Level 1 faults refer to faults that seriously affect the safety, stability, and reliable supply of power; Level 2 faults refer to faults that have a certain impact on the operation of the power system and equipment; and Level 3 faults refer to faults that have a relatively small impact on the operation of the power system and equipment.

[0084] For example, an independent abnormal fault item is a voltage transformer fault. According to the preset fault calibration specification, its corresponding fault level is determined to be a level one fault, which means that a voltage transformer fault will cause the equipment to shut down, affecting the stability and safety of the power supply.

[0085] Furthermore, based on the fault levels determined above, the initial control priority corresponding to the current independent abnormal fault item is set. The fault level of an independent abnormal fault item is directly proportional to its corresponding initial control priority; that is, the higher the fault level, the higher the corresponding initial control priority.

[0086] In step S603, if multiple independent fault items have the same initial control priority, in order to further improve the control processing efficiency of these multiple independent fault items, the independent fault items corresponding to the same initial control priority are designated as target independent fault items. Then, their corresponding control priority is set according to the fault inducing factors of the target independent fault item. The fault inducing factors are directly proportional to the control priority; that is, the greater the fault inducing factors of the target independent fault item, the higher its corresponding control priority. The fault inducing factors refer to the number of factors that cause the target independent fault item to occur.

[0087] The reactive voltage control method provided in this embodiment sets the control priority for independent abnormal fault items by combining the fault level and actual fault cause quantity, thereby improving the control and processing efficiency of independent abnormal fault items with relatively high abnormal impact.

[0088] In one embodiment of this example, such as Figure 7 As shown, step S603, which involves setting the corresponding control priority based on the fault cause quantity of the corresponding target independent abnormal fault item if the same initial control priority exists, includes the following steps: S701. If there are the same initial control priorities, determine whether the fault cause quantities corresponding to the target independent abnormal fault items are the same; S702. If the fault cause quantities corresponding to the target independent abnormal fault items are the same, obtain the proportion of the dominant cause in the fault cause quantities, and set the control priority corresponding to the target independent abnormal fault items according to the proportion of the dominant cause.

[0089] In steps S701 and S702, if there are identical initial control priorities and the fault cause quantities corresponding to the current target independent abnormal fault items are also identical, then to further improve the control processing efficiency of multiple independent abnormal fault items, the proportion of dominant causes in the fault cause quantities corresponding to each target independent abnormal fault item is obtained. The proportion of dominant causes refers to the probability that the occurrence of a certain abnormal fault item in the power system is caused by one or more dominant factors, i.e., the degree of contribution of that factor to the fault item. This proportion can be obtained through analysis and statistics of historical data.

[0090] For example, in a power system, the target independent abnormal fault items are circuit breaker faults and overvoltage faults. The fault causes corresponding to circuit breaker faults include operational errors, circuit breaker quality, and environmental factors. Operational errors and circuit breaker quality are the most important causes of circuit breaker faults, accounting for 60% of the total fault items. That is, operational errors and circuit breaker quality are the dominant causes of circuit breaker faults, accounting for 60% of the dominant causes. The fault causes corresponding to overvoltage faults include abnormal loads, transformer overloads, and generator out-of-synchronization. Among them, transformer overloads are the most important cause of overvoltage faults, accounting for 30% of the dominant causes.

[0091] Furthermore, based on the proportion of dominant causes determined by the above-mentioned circuit breaker faults and overvoltage faults, the control priority of circuit breaker faults is set to be higher than that of overvoltage faults.

[0092] The reactive voltage control method provided in this embodiment further sets the control priority corresponding to the target independent abnormal fault item according to the proportion of the dominant cause in the fault cause quantity. In this way, the target independent abnormal fault items with a higher proportion of the dominant cause can be selectively processed first, thereby improving the control and processing efficiency of the independent abnormal fault items.

[0093] This application discloses a reactive power control system, such as... Figure 8 As shown, it includes: Data acquisition module 1 is used to acquire voltage data corresponding to the power system; If the voltage data does not meet the preset voltage control standard, the abnormal fault acquisition module 2 is used to acquire the abnormal fault item corresponding to the voltage data. If there are multiple abnormal fault items, the correlation analysis module 3 is used to determine whether there is an abnormal correlation between the abnormal fault items. The associated anomaly acquisition module 4 is used to acquire the corresponding associated anomaly fault items if there is an anomaly association between them. The correlation trigger generation module 5 is used to obtain the correlation triggering factors between the correlation abnormal fault items, and generate the direct triggering items and indirect triggering items corresponding to the correlation abnormal fault items according to the triggering type of the correlation triggering factors in each correlation abnormal fault item. The first strategy generation module 6 is used to generate and execute the reactive voltage control strategy corresponding to the associated abnormal fault item based on the direct and indirect causal items. Independent anomaly acquisition module 7: If there is no anomaly association between anomaly fault items, the independent anomaly acquisition module 7 is used to acquire the corresponding independent anomaly fault item. Priority setting module 8 is used to set the control priority of an independent abnormal fault item according to the fault level and fault cause quantity of the independent abnormal fault item. The second strategy generation module 9 generates and executes reactive voltage control strategies corresponding to independent abnormal fault items based on control priority.

[0094] The reactive power and voltage control system provided in this embodiment determines whether there is an abnormal correlation between abnormal fault items based on the correlation analysis module 3, and then performs classification analysis on them. This allows for specific analysis based on the actual abnormal situation of the abnormal fault items. If the correlation anomaly acquisition module 4 determines that there is an abnormal correlation between abnormal fault items, then the first strategy generation module 6 generates reactive power and voltage control strategies for anomaly classification control based on the direct and indirect causes that induced the associated abnormal fault items. If the independent anomaly acquisition module 7 determines that there is no abnormal correlation between abnormal fault items, then the priority setting module 8 generates a control priority that matches the processing efficiency of the independent abnormal fault items based on the fault level and fault cause quantity corresponding to the independent abnormal fault items. The second strategy generation module 9 then generates a corresponding reactive power and voltage control strategy based on this control priority. By performing correlation analysis on the abnormal fault items existing in the current power system and classifying the causes that induced the abnormal fault items according to their attributes, a reactive power and voltage control strategy more suitable for the current abnormal fault items is obtained, thereby improving the reactive power and voltage control efficiency of the current power system.

[0095] It should be noted that the reactive voltage control system provided in this application embodiment also includes each module and / or corresponding sub-module corresponding to the logical function or logical step of any of the above reactive voltage control methods, to achieve the same effect as each logical function or logical step, which will not be elaborated here.

[0096] This application also discloses a terminal device, including a memory, a processor, and computer instructions stored in the memory and capable of running on the processor, wherein the processor executes the computer instructions using any of the reactive voltage control methods described in the above embodiments.

[0097] The terminal device can be a computer device such as a desktop computer, a laptop computer, or a cloud server. The terminal device includes, but is not limited to, a processor and a memory. For example, the terminal device may also include input / output devices, network access devices, and buses.

[0098] The processor can be a central processing unit (CPU). Of course, depending on the actual use, it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc., and this application does not limit it.

[0099] The memory can be an internal storage unit of the terminal device, such as a hard disk or RAM of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk, smart memory card (SMC), secure digital card (SD), or flash memory card (FC) equipped on the terminal device. Furthermore, the memory can be a combination of internal storage units and external storage devices of the terminal device. The memory is used to store computer instructions and other instructions and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output. This application does not limit this.

[0100] In this terminal device, any of the reactive voltage control methods in the above embodiments can be stored in the memory of the terminal device and loaded and executed on the processor of the terminal device for convenient use.

[0101] This application also discloses a computer-readable storage medium, which stores computer instructions, wherein when the computer instructions are executed by a processor, any of the reactive voltage control methods described in the above embodiments are employed.

[0102] The computer instructions can be stored in a computer-readable medium. The computer instructions include computer instruction code, which can be in the form of source code, object code, executable file, or certain middleware. The computer-readable medium includes any entity or device capable of carrying computer instruction code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the computer-readable medium includes, but is not limited to, the above-mentioned components.

[0103] In this computer-readable storage medium, any one of the reactive voltage control methods in the above embodiments can be stored in the computer-readable storage medium and loaded and executed on the processor to facilitate the storage and application of the above methods.

[0104] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reactive power voltage control method, characterized in that, Includes the following steps: Obtain the voltage data corresponding to the power system; If the voltage data does not meet the preset voltage control standard, then the abnormal fault item corresponding to the voltage data is obtained; If there are multiple abnormal fault items, then determine whether there is an abnormal correlation between the abnormal fault items; If there is an abnormal association among the abnormal fault items, then obtain the corresponding associated abnormal fault item; Obtain the associated triggering factors between the associated abnormal fault items, and generate direct triggering items and indirect triggering items corresponding to the associated abnormal fault items according to the triggering type of the associated triggering factors in each associated abnormal fault item; Based on the direct cause item and the indirect cause item, generate and execute the reactive voltage control strategy corresponding to the associated abnormal fault item; If there is no abnormal association between the abnormal fault items, then obtain the corresponding independent abnormal fault item; Based on the fault level and fault cause quantity corresponding to the independent abnormal fault item, the control priority corresponding to the independent abnormal fault item is set; Based on the control priority, the reactive voltage control strategy corresponding to the independent abnormal fault item is generated and executed.

2. The reactive voltage control method according to claim 1, characterized in that, If the abnormal correlation exists among the abnormal fault items, the following steps are included after obtaining the corresponding associated abnormal fault items: Obtain the historical matching rate between the associated abnormal fault items; If the historical matching rate does not meet the preset anomaly calibration standard, then obtain the triggering record of the associated triggering factor corresponding to the associated anomaly fault item; Obtain the association level and occurrence frequency of the associated triggering factors in the triggering records; Based on the association level and the frequency of triggering, a control ranking table is formed corresponding to the association triggering factors.

3. The reactive voltage control method according to claim 2, characterized in that, The process of forming a control ranking table corresponding to the associated triggering factors based on the association level and triggering frequency includes the following steps: Obtain the number of abnormal associations corresponding to the aforementioned inducing factors; Based on the number of abnormal associations and the control recovery rate corresponding to the number of abnormal associations, the association level corresponding to the association inducing factor is set. Based on the association level and the triggering frequency, a control ranking table corresponding to the association triggering factors is formed.

4. The reactive voltage control method according to claim 1, characterized in that, The step of generating and executing the reactive power control strategy corresponding to the associated abnormal fault item based on the direct cause item and the indirect cause item includes the following steps: Based on the direct cause item, generate the main voltage regulation scheme for the associated abnormal fault item; Based on the indirect cause item, obtain the elimination scheme corresponding to the direct cause item; Combining the voltage stabilization master scheme and the anomaly elimination slave scheme, the reactive voltage control strategy corresponding to the associated abnormal fault item is generated, and the reactive voltage control strategy is executed.

5. The reactive voltage control method according to claim 4, characterized in that, After combining the voltage stabilization master scheme and the anomaly elimination slave scheme to generate the reactive voltage control strategy corresponding to the associated abnormal fault item, and executing the reactive voltage control strategy, the following steps are also included: Obtain the voltage regulation rate corresponding to the master voltage regulation scheme and the rejection rate corresponding to the slave rejection scheme in the reactive voltage control strategy; By combining the voltage regulation rate and the anomaly elimination rate, a control feedback report corresponding to the reactive voltage control strategy is generated.

6. The reactive voltage control method according to claim 1, characterized in that, The step of setting the control priority corresponding to the independent abnormal fault item based on the fault level and fault cause quantity of the independent abnormal fault item includes the following steps: According to the preset fault calibration specification, obtain the fault level corresponding to the independent abnormal fault item; Based on the fault level, the initial control priority corresponding to the independent abnormal fault item is set; If there are identical initial control priorities, then the corresponding control priority is set according to the fault cause quantity of the corresponding target independent abnormal fault item, and the fault cause quantity is proportional to the control priority.

7. The reactive voltage control method according to claim 6, characterized in that, If there are identical initial control priorities, then setting the corresponding control priority based on the fault cause quantity of the corresponding target independent abnormal fault item, wherein the fault cause quantity is proportional to the control priority, includes the following steps: If the same initial control priority exists, then determine whether the fault cause quantity corresponding to the target independent abnormal fault item is the same; If the number of fault causes corresponding to the target independent abnormal fault items is the same, then the proportion of the dominant cause in the number of fault causes is obtained, and the control priority corresponding to the target independent abnormal fault item is set according to the proportion of the dominant cause.

8. A reactive voltage control system, characterized in that, include: The data acquisition module (1) is used to acquire the voltage data corresponding to the power system; The abnormal fault acquisition module (2) is used to acquire the abnormal fault item corresponding to the voltage data if the voltage data does not meet the preset voltage control standard. The correlation analysis module (3) is used to determine whether there is an abnormal correlation between the abnormal fault items if there are multiple abnormal fault items. The associated anomaly acquisition module (4) is used to acquire the corresponding associated anomaly fault item if there is an anomaly association between the anomaly fault items. The associated cause generation module (5) is used to obtain the associated inducing factors between the associated abnormal fault items, and generate the direct cause item and indirect cause item corresponding to the associated abnormal fault item according to the inducing factor type of the associated inducing factor in each associated abnormal fault item. The first strategy generation module (6) is used to generate and execute the reactive voltage control strategy corresponding to the associated abnormal fault item based on the direct cause item and the indirect cause item. Independent anomaly acquisition module (7): If there is no anomaly association between the anomaly fault items, the independent anomaly acquisition module (7) is used to acquire the corresponding independent anomaly fault item. The priority setting module (8) is used to set the control priority corresponding to the independent abnormal fault item according to the fault level and fault cause quantity corresponding to the independent abnormal fault item. The second strategy generation module (9) generates and executes the reactive voltage control strategy corresponding to the independent abnormal fault item according to the control priority.

9. A terminal device, comprising a memory and a processor, characterized in that, The memory stores computer instructions that can run on the processor. When the processor loads and executes the computer instructions, it employs a reactive voltage control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing computer instructions, characterized in that, When the computer instructions are loaded and executed by the processor, a reactive voltage control method as described in any one of claims 1 to 7 is employed.

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