Method for judging reactive power oscillation source of power grid

Abstract

The invention relates to the technical field of power grid operation and maintenance, and provides a method for judging a reactive power oscillation source of a power grid, which comprises the following steps of: establishing a mirror image test space group by utilizing a clustering analysis technology through acquiring related historical data of reactive power oscillation of the power grid, control information of a generator excitation regulator and running state parameters of the power grid; and a suitable judgment model is matched for each space for testing. By copying the task to a plurality of test spaces for parallel processing, the matching result in accordance with the preset voltage fluctuation range can be efficiently screened out, so that the reactive power oscillation source of the power grid is accurately determined. And finally, generating an execution parameter and sending the execution parameter to the equipment end for adjustment, thereby effectively reducing voltage fluctuation and equipment loss in the judgment process, and remarkably improving the stability of power supply of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid operation and maintenance, and in particular to a method for determining a reactive power oscillation source of a power grid. Background Art

[0002] The source of reactive power oscillation in the power grid refers to the source of periodic fluctuations in reactive power in the power grid. During the operation of the power grid, the oscillation of reactive power is caused by many factors, such as power grid failure, generator demagnetization, transmission power exceeding the static stability limit, asynchronous reclosing, and weak power grid structure. These oscillations will affect the stable operation of the power grid, resulting in voltage fluctuations, increased equipment losses, and reduced power supply quality. In order to quickly identify the source of oscillation, specific methods can be used, such as switching the control mode of the generator excitation regulator to determine whether the source is inside or outside the excitation regulator, so as to take timely measures to eliminate the oscillation and ensure the safe and stable operation of the power grid.

[0003] The specific steps for determining the source of reactive power oscillation in the power grid are as follows: During the operation of the power grid, if reactive power oscillation occurs, first switch the control mode of the generator excitation regulator from automatic control to manual control. Then, observe the changes in reactive power. If the reactive power still fluctuates at this time, it can be determined that the source is outside the excitation regulator, that is, the power grid fails. If the reactive power stops fluctuating at this time, it can be determined that the source is inside the excitation regulator. In the process of determining the source of reactive power oscillation in the power grid, there are technical pain points. In the process of determining the source of reactive power oscillation in the power grid, voltage fluctuations and increased equipment losses are caused, which affect the normal operation of the power grid and lead to unstable power supply in the power grid. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for determining the source of reactive power oscillations in a power grid, thereby solving the problem that in the process of determining the source of reactive power oscillations in the power grid, voltage fluctuations and increased equipment losses are caused, which affects the normal operation of the power grid and leads to unstable power supply in the power grid.

[0005] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] The present invention provides a method for determining the source of reactive power oscillation in a power grid, comprising:

[0007] Step S101, obtaining historical data of reactive power oscillation sources of the power grid, control of the generator excitation regulator, changes in reactive power, power grid operation status parameters, and excitation regulator faults;

[0008] Step S102, performing cluster analysis on the historical data of reactive power oscillation sources of the power grid to obtain clustering results of reactive power oscillation sources of the power grid, establishing corresponding mirror test spaces according to the data types of the clustering results of reactive power oscillation sources of the power grid to obtain a mirror test space group, the mirror test space group including a first test space, a second test space, a third test space and a fourth test space;

[0009] Step S103, receiving a task for determining a reactive power oscillation source of a power grid, parsing the task for determining a reactive power oscillation source of a power grid, obtaining the parsed task for determining a reactive power oscillation source of a power grid, matching the parsed task for determining a reactive power oscillation source of a power grid in a judgment model knowledge base, obtaining a first judgment model, a second judgment model, a third judgment model, and a fourth judgment model, configuring the first judgment model in a first test space, configuring the second judgment model in a second test space, configuring the third judgment model in a third test space, and configuring the fourth judgment model in a fourth test space;

[0010] Step S104, counting the number of test spaces in the mirror test space group to obtain the number of test spaces, and duplicating the task of determining the reactive power oscillation source of the power grid according to the number of test spaces to obtain the first task of determining the reactive power oscillation source of the power grid, the second task of determining the reactive power oscillation source of the power grid, the third task of determining the reactive power oscillation source of the power grid, and the fourth task of determining the reactive power oscillation source of the power grid;

[0011] Step S105, substitute the first grid reactive power oscillation source task to be judged into the first judgment model in the first test space, output the first test result, substitute the second grid reactive power oscillation source task to be judged into the second judgment model in the second test space, output the second test result, substitute the third grid reactive power oscillation source task to be judged into the third judgment model in the third test space, output the third test result, substitute the fourth grid reactive power oscillation source task to be judged into the fourth judgment model in the fourth test space, output the fourth test result, substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model, output the fourth test result, and substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model. A match is performed in the recognition database to obtain a first matching result, a second matching result, a third matching result and a fourth matching result, the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and the matching results that meet the preset voltage fluctuation range are screened out to obtain the matching results that meet the preset voltage fluctuation range, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are retrieved, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are used as execution parameters, and the execution parameters are sent to the device end to obtain the grid reactive power oscillation source judgment result.

[0012] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S101 comprises:

[0013] Extracting data of historical reactive power oscillation events from the power grid operation records, the data of historical reactive power oscillation events including the time, location, duration, amplitude of the oscillation, and operation status parameters of the power grid;

[0014] Acquire control information of the generator excitation regulator, the control information of the generator excitation regulator includes the control strategy, parameter setting, control mode and change record of the generator excitation regulator during the control process;

[0015] Obtain reactive power change data in real time through power grid monitoring equipment. The reactive power change data includes the real-time value, change trend and fluctuation frequency of reactive power;

[0016] The grid operation status parameters obtained include the real-time operation voltage of the grid, the real-time operation current of the grid, the real-time operation active power of the grid, the real-time operation frequency of the grid, and the topological structure of the grid.

[0017] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S102 includes:

[0018] According to the historical data of reactive power oscillation sources of the power grid, a selected clustering algorithm is used to perform clustering analysis on the pre-processed historical data of reactive power oscillation sources of the power grid to obtain a clustering result;

[0019] According to the data types and characteristics of the clustering results, a corresponding mirror test space is established. Each mirror test space corresponds to a specific cluster and is used to simulate and test the reactive power oscillation source of the power grid under the cluster.

[0020] Organize the established multiple mirror test spaces into a mirror test space group, and group and sort the mirror test spaces.

[0021] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S103 includes:

[0022] Receive a task request initiated by a user to determine the source of reactive power oscillation in the power grid, parse the received task, and obtain the task requirements, objectives, and required input data. The required input data includes the characteristics of the oscillation event, the range of historical data, and the specific source type that needs to be determined;

[0023] The system accesses a pre-built judgment model knowledge base, the judgment model knowledge base including a model for judging a reactive power oscillation source of a power grid;

[0024] According to the analyzed task requirements, matching is performed in the judgment model knowledge base to select the most suitable judgment model for the current oscillation event. Based on the matching results, four most suitable judgment models for the current task are selected, which are named the first judgment model, the second judgment model, the third judgment model and the fourth judgment model respectively.

[0025] The four selected judgment models are respectively configured into the four mirror test spaces established previously. The mirror test space includes connecting the model with the data interface of the test space, setting the parameters and initial conditions of the model, and configuring the resources required for the model operation.

[0026] After the configuration is completed, the judgment models in the four test spaces are verified. The verification of the judgment models in the four test spaces includes conducting preliminary test runs and checking the rationality of the model outputs.

[0027] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S104 comprises:

[0028] The established mirror test space group is traversed or queried to determine the total number of test spaces in the group. According to the number of test spaces, the system determines how many copies of the original task of determining the oscillation source of reactive power in the power grid needs to be made;

[0029] The system copies the original task to generate task copies that match the number of test spaces, generating four task copies. The four task copies are named the first grid reactive power oscillation source task to be determined, the second grid reactive power oscillation source task to be determined, the third grid reactive power oscillation source task to be determined, and the fourth grid reactive power oscillation source task to be determined.

[0030] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S105 comprises:

[0031] The specific steps of judging the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result, and selecting the matching results that meet the preset voltage fluctuation range include:

[0032] Set the voltage fluctuation range as the judgment standard according to the stable operation requirements of the power grid and actual experience;

[0033] Extracting information related to voltage fluctuation from the first test result, the second test result, the third test result, and the fourth test result, respectively, the information on voltage fluctuation including a real-time value of the voltage, a fluctuation amplitude, and a fluctuation frequency;

[0034] Determine whether the voltage fluctuation is within a preset range. For each test result, compare the voltage fluctuation information therein with the preset voltage fluctuation range. If the voltage fluctuation is within the preset range, it is considered that the test result meets the requirements. If the voltage fluctuation exceeds the preset range, it is considered that the test result does not meet the requirements.

[0035] The matching results whose voltage fluctuations are within a preset range are selected from the four test results, and the matching results are considered to represent the actual grid reactive power oscillation sources.

[0036] Furthermore, in the method for determining the source of reactive power oscillation in a power grid described in the present invention, step S105 comprises:

[0037] The voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and for each matching result that meets the preset voltage fluctuation range, the grid reactive power oscillation source control parameters corresponding to the matching result are searched in the preset oscillation knowledge base, and the grid reactive power oscillation source control parameters include adjusting the settings of the reactive compensation equipment, changing the parameters of the generator excitation system, and adjusting the grid structure or load distribution;

[0038] The found control parameters are organized into execution parameters, which will be used to adjust the operating state of the power grid to suppress or eliminate reactive power oscillation. The execution parameters are sent to the device end through the communication network. The device end is the reactive compensation equipment, generator excitation system and automatic control system in the power grid.

[0039] Beneficial effects of the present invention:

[0040] The present invention uses a combination of mirror test space and judgment model to accurately judge the source of reactive power oscillation in the power grid without directly interfering with the actual power grid operation, effectively avoiding the voltage fluctuation problem caused by traditional methods and improving the stable operation of the power grid.

[0041] Traditional methods often require frequent adjustment of grid operation parameters when determining vibration sources, which will undoubtedly increase equipment loss. However, the present invention reduces the number of actual adjustments through simulation testing, thereby effectively reducing equipment loss and extending the service life of the equipment.

[0042] The present invention utilizes cluster analysis and the establishment of a mirror test space to quickly locate the vibration source, significantly reducing the time required for judgment. At the same time, the parallel operation of multiple judgment models further improves the efficiency of judgment, allowing power grid operation and maintenance personnel to respond to and handle reactive power oscillation problems more quickly.

[0043] Since the present invention can quickly and accurately determine and eliminate reactive power oscillations, the influence of oscillations on the power supply quality of the power grid is avoided, which helps to improve the power supply stability and reliability of the power grid, so that users can enjoy high-quality power supply.

[0044] By timely and accurately judging and processing the reactive power oscillation source, the present invention helps prevent the occurrence of power grid accidents. This not only enhances the safety of the power grid, but also reduces the safety risks caused by power grid failures. The implementation of the present invention can reduce power grid failures and power outages caused by reactive power oscillations, thereby reducing the operation and maintenance costs of the power grid.

[0045] By improving the stability and power supply quality of the power grid, the present invention indirectly improves the user's power consumption experience, reduces the inconvenience and losses caused by power grid failures, and enables users to use power resources more safely and conveniently.

[0046] In summary, the present invention effectively solves the problem of determining the source of reactive power oscillation in a power grid through innovative methods and technical means, and not only provides a strong guarantee for the safe, stable and efficient operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on the drawings without paying any creative labor.

[0048] Figure 1 A schematic flow chart of a method for determining the source of reactive power oscillation in a power grid provided by the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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. The technical solutions provided by the embodiments of the present invention are described in detail below in conjunction with the drawings.

[0050] In order to better understand the purpose of the present invention, the present invention is described in further detail below.

[0051] The present invention provides a method for determining the source of reactive power oscillation in a power grid, comprising:

[0052] Step S101, obtaining historical data of reactive power oscillation sources of the power grid, control of the generator excitation regulator, changes in reactive power, power grid operation status parameters, and excitation regulator faults;

[0053] From the long-term operation records of the power grid, the data of historical reactive power oscillation events are extracted, including the specific time, location, duration, amplitude of the oscillation, and the operating status parameters of the power grid at that time.

[0054] Collect relevant control information of the generator excitation regulator, including its control strategy, parameter settings, control mode and change records during the control process. The excitation regulator is a device that controls the reactive power output of the generator. Its control information plays a vital role in determining whether the reactive power oscillation is caused by the generator excitation regulator.

[0055] Utilize power grid monitoring equipment to obtain reactive power values, change trends, and fluctuation frequencies in real time. These real-time data can directly reflect the reactive power status of the current power grid and are an important basis for determining the source of oscillation.

[0056] Obtain the real-time operating parameters of the power grid, which include voltage, current, active power, frequency, and topological structure of the power grid.

[0057] If there is an excitation regulator fault in the power grid, the fault information includes the time, location, type, cause and impact of the fault. Excitation regulator fault is one of the direct causes of reactive power oscillation, so detailed recording and analysis of its fault information is necessary.

[0058] In summary, step S101 provides a solid foundation for cluster analysis, model matching and test result verification in subsequent steps by comprehensively collecting and processing data and information related to the reactive power oscillation source of the power grid.

[0059] Step S102, performing cluster analysis on the historical data of reactive power oscillation sources of the power grid to obtain clustering results of reactive power oscillation sources of the power grid, establishing corresponding mirror test spaces according to the data types of the clustering results of reactive power oscillation sources of the power grid to obtain a mirror test space group, the mirror test space group including a first test space, a second test space, a third test space and a fourth test space;

[0060] The selected clustering algorithm is used to perform cluster analysis on the preprocessed historical data of reactive power oscillation sources of the power grid. The choice of clustering algorithm depends on the characteristics of the data and the analysis objectives. Commonly used algorithms include K-means, hierarchical clustering, DBSCAN, etc. Through cluster analysis, historical data points with similar characteristics are grouped together to better understand the patterns and structures in the data and provide a classification basis for the subsequent establishment of the mirror test space.

[0061] Based on the results of cluster analysis, each cluster result corresponds to a specific data type and feature. According to these features and types, a corresponding mirror test space is established. The mirror test space is a virtual environment used to simulate and test the reactive power oscillation source of the power grid under this cluster. Through the mirror test space, different types of oscillation sources can be simulated and tested without interfering with the actual power grid operation, so as to understand their characteristics and behaviors more accurately.

[0062] The multiple mirror test spaces are organized into a mirror test space group, where the mirror test space group includes a first test space, a second test space, a third test space, and a fourth test space, etc. Each test space corresponds to a specific clustering result.

[0063] Grouping and sorting,In order to more efficiently allocate and process subsequent tasks, the mirror test spaces are grouped and sorted.,In this way, specific test spaces can be quickly selected for simulation and testing as needed.

[0064] The mirror test space group consists of multiple mirror test spaces, each of which targets different clustering results and oscillation source types. The mirror test space group provides the infrastructure for subsequent task allocation, model testing, and oscillation source judgment. It ensures that different types of grid reactive power oscillation sources can be simulated and tested efficiently and accurately, so that the oscillation source can be quickly identified and corresponding measures can be taken.

[0065] In summary, step S102 provides a solid data analysis and simulation test foundation for subsequent grid reactive power oscillation source determination through cluster analysis, establishment of mirror test space and organization of mirror test space group.

[0066] Step S103, receiving a task for determining a reactive power oscillation source of a power grid, parsing the task for determining a reactive power oscillation source of a power grid, obtaining the parsed task for determining a reactive power oscillation source of a power grid, matching the parsed task for determining a reactive power oscillation source of a power grid in a judgment model knowledge base, obtaining a first judgment model, a second judgment model, a third judgment model, and a fourth judgment model, configuring the first judgment model in a first test space, configuring the second judgment model in a second test space, configuring the third judgment model in a third test space, and configuring the fourth judgment model in a fourth test space;

[0067] The system receives a task request initiated by a user to determine the source of reactive power oscillation in a power grid, and the task request to determine the source of reactive power oscillation in a power grid includes information such as a basic description of the oscillation event, a specific source type to be determined, and an expected output result;

[0068] The system analyzes the received tasks in detail to clarify the specific requirements, goals and required input data of the tasks. The required input data includes the characteristics of the oscillation events, the range of historical data, etc., which are used for subsequent model matching and testing.

[0069] Knowledge base access: The system accesses a pre-built judgment model knowledge base. The knowledge base contains a variety of models for judging the source of reactive power oscillations in the power grid, and each model is optimized for a specific oscillation event type or feature.

[0070] According to the analyzed task requirements, the system matches in the judgment model knowledge base and selects the most suitable judgment model for the current oscillation event. The matching process considers factors such as the accuracy, efficiency and similarity of the model with the current oscillation event. Based on the matching results, the system selects four judgment models that are most suitable for the current task, named the first judgment model, the second judgment model, the third judgment model and the fourth judgment model.

[0071] The four selected judgment models are respectively configured into the four mirror test spaces established previously. The configuration process includes connecting the model with the data interface of the test space, setting the parameters and initial conditions of the model, and configuring the resources required for the model to run.

[0072] After configuration is completed, the judgment models in the four test spaces are verified. The verification process includes preliminary test runs, checking the rationality of model outputs, and comparing with other models or historical data. Through verification, it can be ensured that the selected model is suitable for the current task requirements and lay the foundation for subsequent testing and analysis.

[0073] In summary, step S103 provides an accurate model and test environment for subsequent grid reactive power oscillation source determination through the processes of task analysis, model matching and model configuration.

[0074] Step S104, counting the number of test spaces in the mirror test space group to obtain the number of test spaces, and duplicating the task of determining the reactive power oscillation source of the power grid according to the number of test spaces to obtain the first task of determining the reactive power oscillation source of the power grid, the second task of determining the reactive power oscillation source of the power grid, the third task of determining the reactive power oscillation source of the power grid, and the fourth task of determining the reactive power oscillation source of the power grid;

[0075] The system needs to traverse or query the mirror test space group to determine the total number of test spaces in the group. The main purpose of counting the number of test spaces is to provide an accurate basis for subsequent task replication. By knowing how many test spaces there are, the system can make each test space have a corresponding judgment task, thereby achieving parallel processing and improving overall judgment efficiency.

[0076] When the total number of mirror test spaces is determined, the system will copy the original task of determining the source of reactive power oscillations in the power grid, and the number of copies matches the number of test spaces.

[0077] The system generates a corresponding number of task copies based on the total number of test spaces. For example, if the mirror test space group contains four test spaces, the system will generate four task copies.

[0078] In order to distinguish different task copies, the system will name them. The task copies will be named the first grid reactive power oscillation source task to be determined, the second grid reactive power oscillation source task to be determined, and so on.

[0079] The system assigns each task copy to the corresponding test space for subsequent judgment processing. Each test space will have a clear task to be judged, which can be processed independently and in parallel.

[0080] In summary, step S104 counts the number of mirrored test space groups and replicates the judgment tasks accordingly, so that each test space can process the judgment tasks independently and in parallel.

[0081] Step S105, substitute the first grid reactive power oscillation source task to be judged into the first judgment model in the first test space, output the first test result, substitute the second grid reactive power oscillation source task to be judged into the second judgment model in the second test space, output the second test result, substitute the third grid reactive power oscillation source task to be judged into the third judgment model in the third test space, output the third test result, substitute the fourth grid reactive power oscillation source task to be judged into the fourth judgment model in the fourth test space, output the fourth test result, substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model, output the fourth test result, and substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model. A match is performed in the recognition database to obtain a first matching result, a second matching result, a third matching result and a fourth matching result, the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and the matching results that meet the preset voltage fluctuation range are screened out to obtain the matching results that meet the preset voltage fluctuation range, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are retrieved, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are used as execution parameters, and the execution parameters are sent to the device end to obtain the grid reactive power oscillation source judgment result.

[0082] Step S105 is a method for determining the source of reactive power oscillation in a power grid, which involves substituting the task to be determined into the corresponding test space and judgment model, outputting the test result, matching in a preset oscillation knowledge base, and finally obtaining the result of determining the source of reactive power oscillation in the power grid. The following is a detailed explanation of this step:

[0083] The system substitutes the four tasks to be judged of the reactive power oscillation source of the power grid (i.e., the first task to be judged, the second task to be judged, the third task to be judged, and the fourth task to be judged) into the corresponding judgment models in the four mirror test spaces that have been configured before. Specifically, the first task to be judged will be substituted into the first judgment model in the first test space, the second task to be judged will be substituted into the second judgment model in the second test space, and so on. The purpose of this step is to test and analyze different oscillation sources in different simulation environments in order to more accurately identify the actual oscillation source.

[0084] After receiving the corresponding task to be judged, each judgment model will perform calculations and analysis based on the input data (including historical data of the reactive power oscillation source of the power grid, control information of the generator excitation regulator, etc.). After completing the analysis, each model will output a test result, which is an evaluation of the current oscillation source. The test results are the basis for subsequent analysis and judgment. They reflect the nature of the oscillation source under different simulation conditions and provide a basis for further matching and screening.

[0085] The system will substitute the four test results (i.e., the first test result, the second test result, the third test result, and the fourth test result) into the preset oscillation knowledge base for matching. The preset oscillation knowledge base is a database that stores historical oscillation events, oscillation characteristics, and corresponding control parameters. It contains a large amount of historical data and empirical knowledge. Through matching, the system can find the historical oscillation event that is most similar to the current test result, and thus infer the oscillation source. This step is to use historical experience and data to assist in determining the current oscillation source.

[0086] The system judges the voltage fluctuation in the matching results. First, the system sets a voltage fluctuation range, which is determined based on the stable operation requirements of the power grid and actual experience. Then, the system compares whether the voltage fluctuation information in the matching results (including the real-time value of the voltage, fluctuation amplitude, fluctuation frequency, etc.) is within the preset range. By judging the voltage fluctuation, matching results that meet the stable operation requirements of the power grid can be screened out, further narrowing the range of oscillation sources and improving the accuracy of judgment.

[0087] For the matching results that meet the preset voltage fluctuation range, the system will search for the corresponding grid reactive power oscillation source control parameters in the preset oscillation knowledge base. These control parameters include adjusting the settings of reactive compensation equipment, changing the parameters of the generator excitation system, adjusting the grid structure or load distribution, etc. Then, the system will organize these control parameters into execution parameters and send them to the device end (such as reactive compensation equipment, generator excitation system, automatic control system, etc.) through the communication network. The execution parameters are sent to actually adjust the operating status of the power grid to suppress or eliminate reactive power oscillations, thereby solving the oscillation problem.

[0088] Through the above steps, the system can eventually determine the source of the reactive power oscillation of the power grid and obtain the corresponding control parameters. The implementation of the control parameters will contribute to the stable operation of the power grid and improve the safety of the power grid.

[0089] In summary, step S105 can accurately and quickly determine the source of the reactive power oscillation of the power grid and provide effective control measures through a series of complex analysis and processing processes.

[0090] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S101, comprises:

[0091] Extracting data of historical reactive power oscillation events from the power grid operation records, the data of historical reactive power oscillation events including the time, location, duration, amplitude of the oscillation, and operation status parameters of the power grid;

[0092] Acquire control information of the generator excitation regulator, the control information of the generator excitation regulator includes the control strategy, parameter setting, control mode and change record of the generator excitation regulator during the control process;

[0093] Obtain reactive power change data in real time through power grid monitoring equipment. The reactive power change data includes the real-time value, change trend and fluctuation frequency of reactive power;

[0094] The grid operation status parameters obtained include the real-time operation voltage of the grid, the real-time operation current of the grid, the real-time operation active power of the grid, the real-time operation frequency of the grid, and the topological structure of the grid.

[0095] The system retrieves and extracts historical data about reactive power oscillation events from the long-term operation records of the power grid. These data are usually stored in a database or data warehouse for subsequent analysis and query. The extracted data include the time, location, duration, amplitude of the oscillation, and the operating status parameters of the power grid. This information is crucial for understanding the characteristics of the oscillation event, identifying the oscillation mode, and analyzing the cause of the oscillation.

[0096] Through the data interface or monitoring system connected to the generator excitation regulator, the system can obtain its control information in real time or periodically. This usually involves communication with the excitation regulator to obtain its internal control parameters and status information, including the excitation regulator's control strategy (such as PID control, fuzzy control, etc.), parameter settings (such as gain, integration time, etc.), control mode (such as automatic, manual, etc.), and change records during the control process. This control information is of great significance for analyzing the impact of the excitation regulator on the reactive power oscillation of the power grid.

[0097] Using various monitoring devices installed in the power grid (such as power factor monitors, power quality monitoring devices, etc.), the system can collect reactive power data in real time. These devices are usually able to continuously monitor the reactive power changes in the power grid and provide accurate data records. The collected data includes the real-time value of reactive power, change trends (such as rise, fall, fluctuation, etc.) and fluctuation frequency.

[0098] Through the power grid monitoring equipment and monitoring system, the system can obtain the overall operating status parameters of the power grid in real time or regularly. This includes data collected from various nodes and lines of the power grid, as well as the overall operating status information obtained through the monitoring system. Parameters include the real-time operating voltage, current, active power, frequency of the power grid, and the topological structure of the power grid (such as the connection relationship between nodes, lines, transformers, etc.).

[0099] In summary, step S101 provides a solid foundation for subsequent analysis and judgment by comprehensively collecting various information related to the reactive power oscillation of the power grid.

[0100] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S102, comprises:

[0101] According to the historical data of reactive power oscillation sources of the power grid, a selected clustering algorithm is used to perform clustering analysis on the pre-processed historical data of reactive power oscillation sources of the power grid to obtain a clustering result;

[0102] According to the data types and characteristics of the clustering results, a corresponding mirror test space is established. Each mirror test space corresponds to a specific cluster and is used to simulate and test the reactive power oscillation source of the power grid under the cluster.

[0103] Organize the established multiple mirror test spaces into a mirror test space group, and group and sort the mirror test spaces.

[0104] Step S102 is a step in a method for determining the source of reactive power oscillation in a power grid according to the present invention, which involves clustering analysis of historical data of reactive power oscillation sources in the power grid, establishing a corresponding mirror test space according to the clustering results, and finally organizing multiple mirror test spaces into a mirror test space group. The following is a detailed explanation of this step:

[0105] Before clustering analysis, historical data must first be preprocessed, which includes cleaning the data to remove outliers and noise, converting the data format to meet the requirements of the clustering algorithm, and normalizing the data to ensure comparability between different features.

[0106] Select a suitable clustering algorithm based on the characteristics of the data and analysis requirements. Common clustering algorithms include K-means, hierarchical clustering, DBSCAN, etc. Selecting a suitable algorithm is crucial to obtaining accurate clustering results.

[0107] Apply the selected clustering algorithm to cluster the preprocessed historical data. During the clustering process, the algorithm will divide the data into several clusters, each cluster represents a class of similar data points. These clusters will be used to establish the mirror test space later.

[0108] The clustering results are analyzed in depth to understand the data characteristics and distribution of each cluster. This helps to determine the type or mode of reactive power oscillation source represented by each cluster. According to the data type and characteristics of each cluster, the corresponding mirror test space is established. These spaces are virtual environments for simulating and testing the reactive power oscillation source represented by the cluster.

[0109] The corresponding test environment and resources are configured for each mirror test space, including data interface, model parameters, initial conditions, etc. This ensures the accuracy and effectiveness of the test, so that each test space can accurately simulate the corresponding oscillation source.

[0110] Organize multiple mirror test spaces into a mirror test space group;

[0111] Grouping and sorting: The multiple mirror test spaces established are grouped and sorted according to certain rules (such as data type, feature similarity, analysis requirements, etc.). This forms an orderly mirror test space group, which is convenient for subsequent management and analysis.

[0112] Management and maintenance: Effectively manage and maintain the mirror test space group, including updating data, optimizing models, adjusting parameters, etc.

[0113] In summary, step S102 provides strong support for the subsequent determination of the source of reactive power oscillation in the power grid through a series of operations such as cluster analysis, establishing a mirror test space, and organizing a mirror test space group.

[0114] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S103, comprises:

[0115] Receive a task request initiated by a user to determine the source of reactive power oscillation in the power grid, parse the received task, and obtain the task requirements, objectives, and required input data. The required input data includes the characteristics of the oscillation event, the range of historical data, and the specific source type that needs to be determined;

[0116] The system accesses a pre-built judgment model knowledge base, the judgment model knowledge base including a model for judging a reactive power oscillation source of a power grid;

[0117] According to the analyzed task requirements, matching is performed in the judgment model knowledge base to select the most suitable judgment model for the current oscillation event. Based on the matching results, four most suitable judgment models for the current task are selected, which are named the first judgment model, the second judgment model, the third judgment model and the fourth judgment model respectively.

[0118] The four selected judgment models are respectively configured into the four mirror test spaces established previously. The mirror test space includes connecting the model with the data interface of the test space, setting the parameters and initial conditions of the model, and configuring the resources required for the model operation.

[0119] After the configuration is completed, the judgment models in the four test spaces are verified. The verification of the judgment models in the four test spaces includes conducting preliminary test runs and checking the rationality of the model outputs.

[0120] Step S103 is one of the steps of the method for determining the source of reactive power oscillation in the power grid in the present invention, which involves the entire process from receiving a user task request to selecting, configuring and verifying a determination model.

[0121] When the user finds reactive power oscillation problem in the power grid, he will initiate a task request to the system.

[0122] After receiving the user's task request, the system immediately parses the request to clarify the specific requirements, goals and required input data of the task.

[0123] The system has a built-in judgment model knowledge base, which contains a variety of models specifically used to judge the source of reactive power oscillation in the power grid. The models are built based on different algorithms and strategies and can be applied to various types of oscillation events.

[0124] According to the analyzed task requirements, the system will search and match in the judgment model knowledge base to find the most suitable judgment model for the current oscillation event. The system will comprehensively consider factors such as the model's applicability, accuracy, and historical performance, and finally select four judgment models that are most suitable for the current task, and name them the first judgment model, the second judgment model, the third judgment model, and the fourth judgment model.

[0125] In the previous step, the system has established multiple mirror test spaces based on historical data. In this step, the system configures the four selected judgment models into these four mirror test spaces. The configuration process includes connecting the model to the data interface of the test space, setting the parameters and initial conditions of the model, and configuring various resources required for the model to run.

[0126] After configuration, the system will conduct rigorous verification of the judgment models in the four test spaces to ensure that they can operate normally and output reasonable results. The verification process usually includes steps such as conducting preliminary test runs, checking the rationality of the model output, and comparing the results with other models.

[0127] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S104, comprises:

[0128] The established mirror test space group is traversed or queried to determine the total number of test spaces in the group. According to the number of test spaces, the system determines how many copies of the original task of determining the oscillation source of reactive power in the power grid needs to be made;

[0129] The system copies the original task to generate task copies that match the number of test spaces, generating four task copies. The four task copies are named the first grid reactive power oscillation source task to be determined, the second grid reactive power oscillation source task to be determined, the third grid reactive power oscillation source task to be determined, and the fourth grid reactive power oscillation source task to be determined.

[0130] Each mirror test space is established to simulate and test the reactive power oscillation source of the power grid under a specific cluster, so understanding the number of test spaces is crucial for subsequent task allocation and parallel processing. The system traverses or queries the established mirror test space groups. Through program logic or database query, the system can list all mirror test spaces and calculate their total number.

[0131] When the total number of mirror test spaces is determined, the system needs to copy the original task of determining the source of reactive power oscillations in the power grid according to this number. This is to ensure that each test space has a corresponding task copy for processing, thereby achieving parallel judgment and testing, improving efficiency and accuracy. The system copies the original task according to the number of mirror test spaces. The number of copies needs to match the number of mirror test spaces. This is usually implemented through program logic, where the system copies the data structure of the original task and creates multiple task copies as needed. Each task copy contains all the necessary information required to perform the judgment, but is independent of each other so that it can be processed in parallel in different test spaces.

[0132] For the convenience of management and distinction, the system will name the duplicated task copies. In the document, these duplicated task copies are named as the first grid reactive power oscillation source task to be determined, the second grid reactive power oscillation source task to be determined, the third grid reactive power oscillation source task to be determined, and the fourth grid reactive power oscillation source task to be determined (assuming there are four test spaces in total). The actual naming will vary depending on the actual number of mirrored test spaces.

[0133] Each task copy is matched with a mirrored test space so that subsequent judgment model configuration and testing can be performed in that space. This matching ensures that each test space has its corresponding task copy, so that the judgment of the source of reactive power oscillation in the power grid can be performed in parallel.

[0134] In summary, step S104 determines the total number of mirror test space groups by traversing or querying the mirror test space groups, and copies the original tasks according to the total number to generate matching task copies, thereby providing a basis for subsequent parallel judgment and testing.

[0135] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S105, comprises:

[0136] The specific steps of judging the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result, and selecting the matching results that meet the preset voltage fluctuation range include:

[0137] Set the voltage fluctuation range as the judgment standard according to the stable operation requirements of the power grid and actual experience;

[0138] Extracting information related to voltage fluctuation from the first test result, the second test result, the third test result, and the fourth test result, respectively, the information on voltage fluctuation including a real-time value of the voltage, a fluctuation amplitude, and a fluctuation frequency;

[0139] Determine whether the voltage fluctuation is within a preset range. For each test result, compare the voltage fluctuation information therein with the preset voltage fluctuation range. If the voltage fluctuation is within the preset range, it is considered that the test result meets the requirements. If the voltage fluctuation exceeds the preset range, it is considered that the test result does not meet the requirements.

[0140] The matching results whose voltage fluctuations are within a preset range are selected from the four test results, and the matching results are considered to represent the actual grid reactive power oscillation sources.

[0141] Step S105 is one of the steps of the method for determining the source of reactive power oscillation in the power grid in the present invention, which involves determining the voltage fluctuation in the matching results and screening out the matching results that meet the preset voltage fluctuation range. The following is a detailed explanation of the step, including setting the voltage fluctuation range, extracting voltage fluctuation information, determining whether the voltage fluctuation is within the preset range, screening matching results that meet the requirements, obtaining corresponding control parameters, and sending execution parameters to the device end. Specific process and method:

[0142] The system first sets a voltage fluctuation range as a judgment standard based on the stable operation requirements and actual experience of the power grid. This range is based on the safe operation requirements and historical experience of the power grid, and is intended to ensure that the voltage fluctuation is within an acceptable range, thereby ensuring the stable operation of the power grid.

[0143] From each test result (first test result, second test result, third test result, fourth test result), the system extracts information related to voltage fluctuations. This information includes the real-time value of the voltage, the fluctuation amplitude, and the fluctuation frequency, which together constitute the basic data for judging the voltage fluctuation situation.

[0144] For each test result, the system compares the extracted voltage fluctuation information with the preset voltage fluctuation range. The purpose of this step is to determine whether the voltage fluctuation of each test result meets the stable operation requirements of the power grid. If the voltage fluctuation is within the preset range, the test result is considered to meet the requirements; otherwise, the test result is considered to be unsatisfactory.

[0145] The system selects matching results whose voltage fluctuations are within the preset range from the four test results. These matching results are considered to be valid results representing the actual grid reactive power oscillation source, and they will provide an important basis for subsequent oscillation source judgment and control.

[0146] For each matching result that meets the preset voltage fluctuation range, the system searches for the grid reactive power oscillation source control parameters corresponding to the matching result in the preset oscillation knowledge base. These control parameters include adjusting the settings of reactive compensation equipment, changing the parameters of the generator excitation system, and adjusting the grid structure or load distribution, etc. They are to achieve stable operation of the grid.

[0147] The system organizes the found control parameters into execution parameters and sends them to relevant equipment in the power grid, such as reactive power compensation equipment, generator excitation system and automatic control system, through the communication network. These devices will adjust according to the received execution parameters to suppress or eliminate reactive power oscillation, thus ensuring the stable operation of the power grid.

[0148] To sum up, step S105 realizes accurate judgment and effective control of the reactive power oscillation source of the power grid through a series of specific processes and methods such as setting the voltage fluctuation range, extracting voltage fluctuation information, judging whether the voltage fluctuation is within the preset range, screening matching results that meet the requirements, obtaining corresponding control parameters, and sending execution parameters to the device end.

[0149] Specifically, the method for determining the source of reactive power oscillation in a power grid according to the present invention, step S105, comprises:

[0150] The voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and for each matching result that meets the preset voltage fluctuation range, the grid reactive power oscillation source control parameters corresponding to the matching result are searched in the preset oscillation knowledge base, and the grid reactive power oscillation source control parameters include adjusting the settings of the reactive compensation equipment, changing the parameters of the generator excitation system, and adjusting the grid structure or load distribution;

[0151] The found control parameters are organized into execution parameters, which will be used to adjust the operating state of the power grid to suppress or eliminate reactive power oscillation. The execution parameters are sent to the device end through the communication network. The device end is the reactive compensation equipment, generator excitation system and automatic control system in the power grid.

[0152] In step S105, for each matching result that meets the preset voltage fluctuation range, the system needs to perform a series of operations, including searching for control parameters in a preset oscillation knowledge base, sorting execution parameters, and sending the execution parameters to the device end.

[0153] Knowledge base application: The system first accesses the preset oscillation knowledge base, which is a database containing the control parameters of the reactive power oscillation source of the power grid. These control parameters are pre-set based on the power grid operation experience and professional knowledge, and are designed to adjust the operation status of the power grid to suppress or eliminate reactive power oscillation.

[0154] Matching and retrieval: In the knowledge base, the system will retrieve the corresponding control parameters based on the current matching results (i.e. test results that meet the preset voltage fluctuation range). These control parameters include adjusting the settings of reactive power compensation equipment, changing the parameters of the generator excitation system, and adjusting the grid structure or load distribution.

[0155] Parameter integration: The system will integrate the retrieved control parameters into a set of execution parameters. These execution parameters are specific instructions that can be directly applied to the adjustment of grid equipment. They will be used to guide the relevant equipment in the grid to make necessary adjustments to suppress or eliminate reactive power oscillations.

[0156] Parameter optimization: In the process of integrating execution parameters, the system will also optimize and adjust the execution parameters according to the current status and operation requirements of the power grid to ensure the optimization of the adjustment effect.

[0157] Communication network: The system sends the sorted execution parameters to the relevant equipment in the power grid through the communication network. These equipment include reactive power compensation equipment, generator excitation system and automatic control system, which are the components of power grid operation.

[0158] Equipment adjustment: After receiving the execution parameters, the relevant equipment in the power grid will be adjusted according to the parameter instructions. For example, the reactive power compensation equipment will adjust its compensation capacity or compensation method, the generator excitation system will change its excitation current or excitation voltage, and the automatic control system will adjust the load distribution or operation mode of the power grid.

[0159] Through these operations, step S105 realizes the complete process from matching results to control parameters and then to equipment adjustment. This process not only improves the accurate judgment of the reactive power oscillation source of the power grid, but also provides a strong guarantee for the stable operation of the power grid.

[0160] The technical solution of the present invention effectively solves the problem of voltage fluctuation and increased equipment loss caused by the process of determining the source of reactive power oscillation in the power grid, thereby affecting the normal operation of the power grid and the stability of power supply through a series of innovative steps. The following is a detailed explanation:

[0161] The present invention first collects historical data of the reactive power oscillation source of the power grid, control information of the generator excitation regulator, changes in reactive power, power grid operating state parameters, and excitation regulator fault information. These comprehensive data provide a solid foundation for subsequent accurate analysis and judgment. By clustering the historical data and grouping the data according to its type and characteristics, it helps to more accurately understand the characteristics of the reactive power oscillation of the power grid and provide a basis for subsequent processing.

[0162] According to the clustering results, a corresponding mirror test space is established to simulate a specific grid reactive power oscillation scenario. This simulation environment allows testing and analysis to be performed without interfering with the actual grid operation. The use of the mirror test space avoids direct operation in the actual grid, thereby reducing the voltage fluctuations and equipment losses caused.

[0163] According to the number of mirror test spaces, the judgment task is replicated and processed in parallel in each space. This approach significantly improves processing efficiency, reduces time delays on a single processing path, and reduces the impact on real-time operation of the power grid. The judgment model that best suits the current oscillation event is matched in the judgment model knowledge base and configured in the mirror test space. This ensures the accuracy and efficiency of the judgment process and reduces unnecessary misjudgments and duplication of work.

[0164] The test results of each test space are matched with the preset oscillation knowledge base to verify the rationality and accuracy of the test results. By setting the voltage fluctuation range as the judgment standard, the matching results that meet the requirements are screened out to ensure the reliability of the judgment results. For the matching results that meet the preset voltage fluctuation range, the corresponding control parameters are found from the oscillation knowledge base and sent to the device end through the communication network for adjustment. This parameter optimization process helps to quickly suppress or eliminate reactive power oscillations and reduce the instability factors of the power grid. The entire judgment process is carried out in the mirror test space, avoiding the risks brought by direct operation in the actual power grid. This method significantly reduces the risk of voltage fluctuations and equipment losses caused by misoperation or improper handling.

[0165] To sum up, the technical solution of the present invention effectively solves the problems caused by the process of judging the reactive power oscillation source of the power grid through a series of innovative steps such as comprehensive data collection and preprocessing, establishment of mirror test space, parallel processing and model matching, result verification and optimization, and reduction of actual operation risks, thereby ensuring the safe and stable operation of the power grid and the power supply quality.

Claims

1. A method for determining the source of reactive power oscillation in a power grid, characterized in that: include: Step S101, obtaining historical data of reactive power oscillation sources of the power grid, control of the generator excitation regulator, changes in reactive power, power grid operation status parameters, and excitation regulator faults; Step S102, performing cluster analysis on the historical data of reactive power oscillation sources of the power grid to obtain clustering results of reactive power oscillation sources of the power grid, establishing corresponding mirror test spaces according to the data types of the clustering results of reactive power oscillation sources of the power grid to obtain a mirror test space group, the mirror test space group including a first test space, a second test space, a third test space and a fourth test space; Step S103, receiving a task for determining a reactive power oscillation source of a power grid, parsing the task for determining a reactive power oscillation source of a power grid, obtaining the parsed task for determining a reactive power oscillation source of a power grid, matching the parsed task for determining a reactive power oscillation source of a power grid in a judgment model knowledge base, obtaining a first judgment model, a second judgment model, a third judgment model, and a fourth judgment model, configuring the first judgment model in a first test space, configuring the second judgment model in a second test space, configuring the third judgment model in a third test space, and configuring the fourth judgment model in a fourth test space; Step S104, counting the number of test spaces in the mirror test space group to obtain the number of test spaces, and duplicating the task of determining the reactive power oscillation source of the power grid according to the number of test spaces to obtain the first task of determining the reactive power oscillation source of the power grid, the second task of determining the reactive power oscillation source of the power grid, the third task of determining the reactive power oscillation source of the power grid, and the fourth task of determining the reactive power oscillation source of the power grid; Step S105, substitute the first grid reactive power oscillation source task to be judged into the first judgment model in the first test space, output the first test result, substitute the second grid reactive power oscillation source task to be judged into the second judgment model in the second test space, output the second test result, substitute the third grid reactive power oscillation source task to be judged into the third judgment model in the third test space, output the third test result, substitute the fourth grid reactive power oscillation source task to be judged into the fourth judgment model in the fourth test space, output the fourth test result, substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model, output the fourth test result, and substitute the first test result, the second test result, the third test result and the fourth test result into the preset oscillation knowledge model. A match is performed in the recognition database to obtain a first matching result, a second matching result, a third matching result and a fourth matching result, the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and the matching results that meet the preset voltage fluctuation range are screened out to obtain the matching results that meet the preset voltage fluctuation range, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are retrieved, and the grid reactive power oscillation source control parameters corresponding to the matching results that meet the preset voltage fluctuation range are used as execution parameters, and the execution parameters are sent to the device end to obtain the grid reactive power oscillation source judgment result.

2. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 1, characterized in that: The step S101 includes: Extracting data of historical reactive power oscillation events from the power grid operation records, the data of historical reactive power oscillation events including the time, location, duration, amplitude of the oscillation, and operation status parameters of the power grid; Acquire control information of the generator excitation regulator, the control information of the generator excitation regulator includes the control strategy, parameter setting, control mode and change record of the generator excitation regulator during the control process; Obtain reactive power change data in real time through power grid monitoring equipment. The reactive power change data includes the real-time value, change trend and fluctuation frequency of reactive power; The grid operation status parameters obtained include the real-time operation voltage of the grid, the real-time operation current of the grid, the real-time operation active power of the grid, the real-time operation frequency of the grid, and the topological structure of the grid.

3. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 1, characterized in that: The step S102 includes: According to the historical data of reactive power oscillation sources of the power grid, a selected clustering algorithm is used to perform clustering analysis on the pre-processed historical data of reactive power oscillation sources of the power grid to obtain a clustering result; According to the data types and characteristics of the clustering results, a corresponding mirror test space is established. Each mirror test space corresponds to a specific cluster and is used to simulate and test the reactive power oscillation source of the power grid under the cluster. Organize the established multiple mirror test spaces into a mirror test space group, and group and sort the mirror test spaces.

4. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 1, characterized in that: The step S103 includes: Receive a task request initiated by a user to determine the source of reactive power oscillation in the power grid, parse the received task, and obtain the task requirements, objectives, and required input data. The required input data includes the characteristics of the oscillation event, the range of historical data, and the specific source type that needs to be determined; The system accesses a pre-built judgment model knowledge base, the judgment model knowledge base including a model for judging a reactive power oscillation source of a power grid; According to the analyzed task requirements, matching is performed in the judgment model knowledge base to select the most suitable judgment model for the current oscillation event. Based on the matching results, four most suitable judgment models for the current task are selected, which are named the first judgment model, the second judgment model, the third judgment model and the fourth judgment model respectively. The four selected judgment models are respectively configured into the four mirror test spaces established previously. The mirror test space includes connecting the model with the data interface of the test space, setting the parameters and initial conditions of the model, and configuring the resources required for the model operation. After the configuration is completed, the judgment model in the four test spaces is verified.

5. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 1, characterized in that: The step S104 includes: The established mirror test space group is traversed or queried to determine the total number of test spaces in the group. According to the number of test spaces, the system determines how many copies of the original task of determining the oscillation source of reactive power in the power grid needs to be made; The system copies the original task to generate task copies that match the number of test spaces, generating four task copies. The four task copies are named the first grid reactive power oscillation source task to be determined, the second grid reactive power oscillation source task to be determined, the third grid reactive power oscillation source task to be determined, and the fourth grid reactive power oscillation source task to be determined.

6. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 1, characterized in that: The step S105 includes: The specific steps of judging the voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result, and selecting the matching results that meet the preset voltage fluctuation range include: Set the voltage fluctuation range as the judgment standard according to the stable operation requirements of the power grid and actual experience; Extracting information related to voltage fluctuation from the first test result, the second test result, the third test result, and the fourth test result, respectively, the information on voltage fluctuation including a real-time value of the voltage, a fluctuation amplitude, and a fluctuation frequency; Determine whether the voltage fluctuation is within a preset range. For each test result, compare the voltage fluctuation information therein with the preset voltage fluctuation range. If the voltage fluctuation is within the preset range, it is considered that the test result meets the requirements. If the voltage fluctuation exceeds the preset range, it is considered that the test result does not meet the requirements. The matching results whose voltage fluctuations are within a preset range are selected from the four test results, and the matching results are considered to represent the actual grid reactive power oscillation sources.

7. A method for determining the source of reactive power oscillation in a power grid as claimed in claim 6, characterized in that: The step S105 includes: The voltage fluctuations in the first matching result, the second matching result, the third matching result and the fourth matching result are judged, and for each matching result that meets the preset voltage fluctuation range, the grid reactive power oscillation source control parameters corresponding to the matching result are searched in the preset oscillation knowledge base, and the grid reactive power oscillation source control parameters include adjusting the settings of the reactive compensation equipment, changing the parameters of the generator excitation system, and adjusting the grid structure or load distribution; The found control parameters are organized into execution parameters, which will be used to adjust the operating state of the power grid to suppress or eliminate reactive power oscillation. The execution parameters are sent to the device end through the communication network. The device end is the reactive compensation equipment, generator excitation system and automatic control system in the power grid.

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