Transformer substation monitoring system voltage reactive power control strategy verification platform and method

Abstract

The invention discloses a transformer substation monitoring system voltage reactive power control strategy verification platform and method. The platform comprises a model generation tool for extracting main transformer, bus, bus coupler and capacitive reactance device models and communication parameters related to reactive power control in a substation monitoring system SCD model file to form a test data model file; the case generation module is used for matching a case template according to the main transformer characteristic quantity and the wiring mode in the test data model, and generating a test case in combination with the power grid operation condition; the communication control module establishes communication connection with a transformer substation monitoring system according to the generated test case, automatically simulates different working conditions, and receives and feeds back a control instruction sent by the monitoring system in real time; the result verification module is used for carrying out correctness judgment on the locking state change of the monitoring system equipment and the sent control instruction according to the control strategy and the locking principle; and a human-computer interaction interface. According to the invention, the closed-loop dynamic test of the voltage reactive power control software of the transformer substation monitoring system is realized.

Description

Technical Field

[0001] The present invention relates to the field of electric power monitoring systems, and in particular to a voltage and reactive power control strategy verification platform and method for a substation monitoring system. Background Art

[0002] As the monitoring center of the substation automation system, the monitoring system monitors the operating status of the power grid and equipment in real time, and provides control adjustment and auxiliary decision-making. Voltage and reactive power control is an advanced application function of the monitoring system. When the target voltage fluctuates, the main transformer tap changer can be adjusted and reactive equipment can be switched in time to ensure the stability of the regional voltage. Its working principle is to monitor the target voltage in real time, and the operating area is equivalent to several sub-working areas according to the voltage and reactive power limits. Different sub-areas have different adjustment strategies, and comprehensive factors such as parallel operation and equal probability switching must also be considered. Due to the different wiring methods of substations, the operating mode is different in different periods (such as the initial commissioning, during the expansion and renovation, or the completion of the project). This requires that the voltage and reactive power control strategy can adapt to the changes in the power grid operation mode. Before the on-site commissioning, the functional test under different working conditions should be completed according to the current actual operation mode to verify the applicability of its control strategy.

[0003] Since the voltage and reactive power control test involves many primary and secondary devices and needs to meet the requirements of operating conditions, it is impossible to build such complex working conditions in the field environment. The manual setting method is often used to simulate the working conditions by setting different target voltage values ​​in the monitoring system operation screen to verify the correctness of the software control strategy. This test method is a pure static test and cannot provide closed-loop feedback on the control strategy given by the monitoring system. The manually set data is random and has a large difference from the actual operation. In addition, the impact of human factors on the test results is more serious. The test is not comprehensive enough and the efficiency is low. In the substation expansion project, the bus, main transformer or line is often still in operation and does not meet the conditions for shutdown, which makes it impossible to perform overall verification. Therefore, it is urgent to design a software verification platform that can quickly and conveniently access the monitoring host to realize the closed-loop dynamic test of the voltage and reactive power control software of the substation monitoring system. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides a voltage and reactive power control strategy verification platform for a substation monitoring system, which can quickly and conveniently access a monitoring host to implement closed-loop dynamic testing of the voltage and reactive power control software of the substation monitoring system.

[0005] The present invention also provides a corresponding voltage and reactive power control strategy verification method for a transformer substation monitoring system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, a voltage and reactive power control strategy verification platform for a substation monitoring system includes:

[0008] A model generation tool is used to extract the main transformer, busbar, bus coupling, capacitor model and communication parameters related to reactive power control in the SCD model file of the substation monitoring system to form a test data model file, wherein the test data model file includes one or more of the following: power grid topology connection relationship, primary and secondary equipment association relationship, switch knife state model, measurement data model, switch control model and communication parameters;

[0009] A use case generation module is used to match a pre-established use case template according to the main transformer feature quantity in the test data model, and generate a test case in combination with the power grid operation condition, wherein the main transformer feature quantity includes one or more of the number of main transformers, winding type, wiring mode, and parallel conditions;

[0010] The communication control module is used to establish a communication connection with the substation monitoring system based on the generated test cases, automatically simulate different working conditions, and receive and feedback control instructions issued by the monitoring system in real time;

[0011] The result verification module is used to judge the correctness of the lock state changes of the monitoring system equipment and the control instructions issued according to the control strategy and lock principle, and to organize and generate a test report;

[0012] The human-computer interaction interface is used to dynamically display the test process data and graphically display the control strategy, locking status and judgment results of each test item.

[0013] As a preferred embodiment, the model generation tool extracts the main transformer, busbar, bus coupling, capacitor reactor models and communication parameters related to reactive power control in the SCD model file of the substation monitoring system to form a test data model file, including:

[0014] Read the SCD file, parse the file content into different element categories according to the IEC61850 standard, and store them in a temporary memory database; according to the structure of the pre-defined test data model file, classify the parsed device model and communication parameter data by category and store them in different table domain structures.

[0015] Preferably, the use case generation module matches a pre-formulated use case template according to the main transformer characteristic quantity in the test data model, and generates a test case in combination with the power grid operation condition, including:

[0016] Read the generated test data model file, extract the main transformer feature quantity, match the main transformer feature quantity with the variables in the use case template, adjust the test case according to the current operating conditions of the power grid, fill in the variables in the use case template, and generate a specific test case;

[0017] Save the generated test cases to files or databases;

[0018] The power grid operation conditions include: one or more of: main transformer separate operation, main transformer parallel operation, bus separate operation, bus parallel operation, bus over limit, equipment refusal to operate, and equipment locking.

[0019] Preferably, the use case template uses a fixed template reference name to describe the object, and uses this as a unique identifier to describe the use case.

[0020] Preferably, the communication control module establishes a communication connection with the substation monitoring system according to the generated test case, and automatically simulates different working conditions, including:

[0021] Establish a communication connection with the substation monitoring system, set the communication port, address, and authentication information according to the communication parameters in the test data model, and send simulation signals to the monitoring system according to the working condition description in the test case to simulate different power grid operation states;

[0022] Monitor the control instructions issued by the monitoring system in real time, process the received instructions, and feed back the results of the simulated working conditions or the response to the control instructions to the monitoring system; the real-time feedback of the control instructions includes one or more of the real-time feedback of the main transmission gear position, the real-time feedback of the switch position, the real-time feedback of the bus voltage, and the real-time feedback of the reactive power;

[0023] After the test is completed, close the communication connection with the monitoring system.

[0024] Preferably, the control strategy includes: one or more of: tap adjustment principle, capacitor switching principle, and control instruction priority;

[0025] The blocking principles include: one or more of the station-level blocking principle, the main transformer blocking principle, the busbar blocking principle, and the capacitive reactor blocking principle.

[0026] Preferably, the test case consists of multiple groups of test items, each of which includes preset conditions, test logic and evaluation principles;

[0027] The preset conditions are used to describe the operating conditions that should be output before execution;

[0028] The test logic is used to describe the execution content, including output signals, state switching logic, and state transition conditions;

[0029] The evaluation principles are used to describe the content and expected status that should be determined after execution.

[0030] In a second aspect, a method for verifying a voltage and reactive power control strategy of a substation monitoring system comprises the following steps:

[0031] Step 1, obtain the SCD file from the monitoring system through the IEC61850 file service;

[0032] Step 2, extract the main transformer, busbar and capacitor models and their related secondary equipment parameters in the SCD file to form a test data model file including the grid topology connection relationship, primary and secondary equipment association relationship, switch status model, measurement data model, switch control model and communication parameters;

[0033] Step 3, obtain the number of main transformers, winding type, wiring mode, and parallel condition feature quantities from the test data model file, adapt them to the use case template, and obtain a typical use case template applicable to this model;

[0034] Step 4: Based on the characteristics of this model, consider the main transformer separate operation, main transformer parallel operation, busbar separate operation, busbar parallel operation, busbar over-limit, equipment refusal to operate, and equipment locked operation conditions, instantiate and convert the typical use case template to generate test cases;

[0035] Step 5: Execute the test cases in sequence. Before executing each test case, simulate the operating conditions first, and then provide real-time feedback output of the main transmission gear position, switch position, bus voltage, and reactive power according to the control instructions received from the monitoring system. The execution of this test case is considered completed only when the control reaches the target or no instructions are output;

[0036] Step 6, record and analyze the simulation conditions and monitoring system control execution in the use case execution, verify whether the monitoring system output instructions comply with the control strategy, whether the locking status of the system and equipment meets the requirements, and give the judgment result.

[0037] According to a third aspect, a computer device is provided, comprising one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and when the programs are executed by the processors, the steps of the method for verifying the voltage and reactive power control strategy of the substation monitoring system as described in the second aspect of the present invention are implemented.

[0038] In a fourth aspect, a computer storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for verifying the voltage and reactive power control strategy of the substation monitoring system as described in the second aspect of the present invention are implemented.

[0039] Compared with the prior art, the invention has the following beneficial effects: the present invention uses a network method to seamlessly connect with the substation monitoring host, and automatically creates test cases for verification of coverage control strategies and locking principles based on the primary equipment, secondary equipment models and associated relationships in the SCD model file. It simulates all bay-level IED devices in the substation, and can simulate various normal and fault operating conditions according to the wiring method. The verification coverage of the reactive power control software of the monitoring system is more comprehensive, and all test closed-loop execution judgments greatly improve the test efficiency. At the same time, the monitoring system and the verification platform can quickly build a test environment without relying on actual on-site devices. It can effectively solve the problem that the function cannot be verified due to the failure to meet the power outage conditions in the renovation and expansion project, and provide strong support for the on-site deployment and implementation of this function. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the system architecture diagram of the voltage and reactive power control strategy verification platform for the substation monitoring system;

[0041] Figure 2 Execution flow chart of voltage and reactive power control strategy verification platform for substation monitoring system. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0043] The architecture of the voltage and reactive power control function verification platform of the substation monitoring system is as follows: Figure 1 As shown in the figure, it includes five modules: model generation tool, use case generation module, communication control module, result verification module and human-computer interaction interface. The model generation tool and use case generation module are configuration tools of the verification platform. They are used to tailor the SCD model according to the voltage and reactive power control function, extract the content related to the test to build test cases, and the main contents of the test model are shown in Table 1. The communication control module and the result verification module are used to control the test process, set different working conditions according to the test cases, and verify whether the control strategy of the monitoring system output is correct under various circumstances. The human-computer interaction interface is used to visualize the test process.

[0044] Table 1 Test model content

[0045]

[0046]

[0047] Under normal operation, the monitoring system and the actual bay layer equipment of the substation are networked for data communication. Under test, the monitoring system is disconnected from the station control layer network and connected to the verification platform for testing, and restored after verification. During the entire test, the monitoring system does not need to make any configuration changes. The verification system (verification platform) provides simulation of the bay layer equipment to provide the monitoring system with collected data, which can be completely isolated from the on-site operating equipment to meet the debugging requirements of the expansion station.

[0048] Through the above-mentioned architecture design, the voltage and reactive power control function of the substation monitoring system has been effectively verified, ensuring the stability and reliability of the system under various working conditions.

[0049] The SCD file (Substation Configuration Description) in the substation monitoring system is a file used to describe and configure all intelligent electronic devices, communication networks and primary system structures in the substation. The SCD file is unique to the entire station and contains detailed device configuration information and parameters. When parsing the SCD file, DOM (Document Object Model) or SAX (Simple API for XML) is usually used to process the data. Specifically, the model generation tool first reads the SCD file and parses it into different element categories according to the IEC61850 standard and stores it in a temporary memory database; then the parsed data is classified and stored in different table domain structures by category as the basic data for subsequent analysis.

[0050] In the voltage and reactive power control function verification platform of the substation monitoring system, the control-related main transformer, busbar, capacitor model and communication parameters are the core of the test data model file.

[0051] The main transformer model takes a single transformer as the object, and defines the state quantity information such as the switch knife on each winding side of the main transformer, the voltage and reactive power measurement information, the gear and control and other entity information from the aspects of the transformer's electrical characteristics and regulation control, which also includes the connection relationship between the main transformer and the grid topology. In the test data model, the entity model provided by the main transformer model is used to simulate the regulation and control operation of the transformer, and the main transformer gear is changed by adjusting the main transformer tap position up and down, thereby affecting the main variable measurement data, and achieving the purpose of voltage and reactive power control regulation.

[0052] The bus model describes the bus topology of different voltage levels in the power grid and the relationship between transformers, bus couplings, capacitors and busbars. In the test data model, the bus model is the basis of the topological connection relationship of the power grid, and is used to simulate the connection status of the primary system of the substation, especially the working conditions under different operating modes. In addition to the topological model, the measurement data model is also involved, because the bus voltage is an important target parameter for voltage and reactive power control.

[0053] The capacitor model provides the key parameters of the reactive power compensation equipment, which is the key point for the reactive power control strategy verification. In the test data model, the capacitor model directly affects the reactive power value of the system, and its switching control strategy is an important part of simulating reactive power regulation changes in the test model.

[0054] Communication parameters define the physical communication information between the monitoring system and the intelligent electronic devices at the bay layer, such as IP addresses, interface parameters, etc., and are an indispensable part of the test model. It ensures that the verification platform can correctly simulate the intelligent electronic devices of the substation to establish a communication connection with the monitoring system under test, which is crucial for the verification platform to quickly access the monitoring system.

[0055] According to an embodiment of the present invention, the model generation tool extracts the main transformer, bus, bus coupling, capacitor model and communication parameters related to reactive power control in the SCD model file of the substation monitoring system to form a test data model file. The test data model file includes: power grid topology connection relationship, primary and secondary equipment association relationship, switch knife state model, measurement data model, switch control model and communication parameters. Among them, according to the needs of reactive power control, the following model elements are extracted from the SCD model file: main transformer model: find all defined transformer elements and their attributes; bus model: find all bus sections and their connection relationships; bus coupling model: find bus coupling equipment and its attributes; capacitor model: find all capacitor equipment and its parameters. And extract communication parameters, including: extract communication parameter information such as communication address and port in IED configuration. The extracted information is then organized into a new test data model file according to the specified structure, including the power grid topology connection relationship: describing the connection relationship between primary equipment such as busbars, transformers, and busbars; primary and secondary equipment association relationship: mapping the relationship between primary equipment and secondary equipment (such as protection and control devices); switch knife status model: containing status information of switches and knife switches; measurement data model: including analog measurement points such as voltage, current, and power; switch control model: describing the control logic and switch operation; communication parameters: including configuration information of all IEDs and communication networks.

[0056] According to an embodiment of the present invention, the use case generation module matches the use case template according to the main transformer feature quantity and wiring mode in the test data model, and generates a test case in combination with the power grid operation condition. The main transformer feature quantity includes: the number of main transformers, the winding type, the wiring mode, and the parallel condition.

[0057] Number of main transformers: the total number of main transformers in the substation.

[0058] Winding type: The winding configuration and tap position of the main transformer, such as double winding, triple winding, etc.

[0059] Wiring method: Wiring method of main transformer, such as 2 / 3 wiring on high voltage side, double mother belt segmentation on medium voltage side, single mother segmentation on low voltage side, etc.

[0060] Parallel conditions: conditions for parallel operation of main transformers, such as parallel logic on the medium voltage side, parallel logic on the low voltage side, parallel operation logic, etc.

[0061] The grid operating conditions include: main transformer separate operation, main transformer parallel operation, bus separate operation, bus parallel operation, bus over-limit, equipment refusal to operate, and equipment locked.

[0062] Main transformer separate operation: The main transformer operates in separate mode, that is, multiple main transformers are connected across different busbars and operate in separate mode, and the voltage and reactive power are controlled independently.

[0063] Parallel operation of main transformers: The main transformers operate in parallel, that is, the busbars across the medium-voltage or low-voltage sides of multiple main transformers are connected. The main transformers operating in parallel can be regarded as one main transformer with superimposed capacities and controlled simultaneously.

[0064] Busbar split operation: The situation where the busbar operates in a split manner.

[0065] Busbar parallel operation: The situation where the busbars operate in parallel.

[0066] Bus over-limit: The bus voltage exceeds the set limit.

[0067] Device refusal to act: The device fails to perform the corresponding action when receiving a control command.

[0068] Equipment Lockout: A situation where equipment is locked and cannot be operated for safety or protection reasons.

[0069] The use case template uses a fixed template reference name to describe the object, and uses it as a unique identifier to describe the use case. The use case template is to analyze the commonality of existing test cases, list all input and output parameters, and use these parameters as keywords to describe the use case. For example, input parameters: include parameters such as main transformer characteristics and power grid operating conditions. Output parameters: define the expected results of the test case.

[0070] The use case generation module matches the use case template according to the main transformer feature quantity and wiring method in the test data model, specifically including: first extracting the following main transformer feature quantities from the test data model: the number of main transformers, winding type, wiring method, and parallel conditions; then checking whether the number of main transformers in the test data model matches the number in the use case template. According to the winding type in the test data model (such as double winding, triple winding, etc.), find the corresponding use case template. Analyze the wiring method in the test data model (such as 2 / 3 wiring on the high-voltage side, double mother tape segmentation on the medium-voltage side, etc.), and match it with the wiring method in the use case template. According to the parallel conditions in the test data model (such as parallel logic on the medium-voltage side, parallel logic on the low-voltage side, etc.), find the use case template that meets these conditions.

[0071] In the use case generation phase, the test case generation method includes: generating test cases by instantiating the use case template, and the instantiation conversion is to replace the object name in the use case template with the object name in the test data model according to the matching principle. For example, the use case generation module will obtain the corresponding test data model according to the test case generation requirements, and use the previously defined keywords and the test data model to match to generate the test case to be used. In this way, the use case generation module can efficiently generate test cases that meet the requirements, and at the same time decouple the test logic from the test model, thereby improving the editing efficiency of the test case and reducing the design and maintenance costs.

[0072] The test case in the present invention is composed of multiple groups of test items, and each test item may include preset conditions, test logic and evaluation principles.

[0073] Preset conditions are used to describe the operating conditions that should be output before execution. These conditions ensure that the test can be carried out under the expected operating conditions. They may include: the initial state of the power grid, such as the operating mode of the main transformer, busbar, and capacitor; specific equipment configuration, such as whether the main transformer is operated in parallel or in parallel; system parameter settings, such as voltage, current, power factor, etc.; configuration of communication parameters to ensure normal communication between the monitoring system and the equipment.

[0074] Test logic is used to describe the specific steps and operations when executing the test project, including the output signal to be simulated, the state switching process, and the state transition conditions. The output signal is a simulated or actual signal sent to the monitoring system, such as a telesignal signal, a measurement value, etc. The state switching logic describes how to switch from the current state to the next state, including the operation sequence and steps. The state transition condition refers to the specific conditions that trigger the state transition, such as time, event, measurement change rate, etc.

[0075] Evaluation principles are used to describe the content and expected state that should be determined after execution. The system state after execution includes device status, parameter changes, etc. The expected state refers to the ideal state that the system should reach after the test logic is executed. The judgment criteria can be preset to compare the actual results with the expected results, such as the allowable error range, response time, etc.

[0076] According to the embodiment of the present invention, the communication control module establishes a communication connection with the substation monitoring system based on the generated test case, automatically simulates different working conditions, and receives and feedbacks the control instructions issued by the monitoring system in real time. The real-time feedback of the control instructions includes: real-time feedback of the main transmission gear position, real-time feedback of the switch position, real-time feedback of the bus voltage, and real-time feedback of the reactive power.

[0077] The communication control module first establishes a communication connection with the substation monitoring system according to the requirements of the test case. This usually involves configuring the correct communication protocol, port, IP address and other parameters. Then, according to the preset conditions and test logic defined in the test case, various operating conditions of the substation are automatically simulated. This includes simulating changes in grid load, equipment failures, operation commands, etc. While simulating the working conditions, the communication control module receives control instructions from the monitoring system in real time. These instructions may be to adjust the main transmission gear position, switch position, reactive compensation equipment, etc. The communication control module is also responsible for feeding back the simulated working condition results to the monitoring system in real time to ensure that the monitoring system can make correct control decisions based on the actual or simulated grid status.

[0078] Real-time feedback of main transmission gear position: Communication control simulates the change of main transmission gear position and feeds back the real-time status of gear adjustment to the monitoring system so that the monitoring system can verify whether the gear control command is executed correctly.

[0079] Real-time feedback of switch position: When the monitoring system issues a switch control command, the communication control module simulates the action of the switch and feeds back the real-time position of the switch (open or closed) to the monitoring system.

[0080] Real-time feedback of bus voltage: Communication control simulates the change of bus voltage and feeds back the voltage value to the monitoring system in real time, which then performs voltage regulation and reactive power control.

[0081] Real-time reactive power feedback: The communication control module simulates the change of reactive power and feeds back the real-time data of reactive power to the monitoring system to verify the effectiveness of the reactive power control strategy.

[0082] In one example, the detailed steps of establishing a communication connection by the communication control module include:

[0083] Step 1: Configure communication parameters

[0084] According to the information in the SCD file, configure the parameters of the communication control module, including IP address, port number, communication protocol (such as MMS or CMS of IEC 61850), device name, etc.

[0085] Step 2: Initialize the communication interface

[0086] Initialize the hardware and software interfaces of the communication control module to ensure that the module can send and receive data.

[0087] Step 3: Establish a communication connection

[0088] Use the configured parameters to listen for connection requests initiated by the substation monitoring system. Confirm that the connection request from the monitoring system is received and a stable communication link is established.

[0089] Step 4: Verify communication quality

[0090] Verify the stability and reliability of the communication link by sending test messages or performing simple communication handshakes. Check key indicators such as communication delay and data packet loss rate to ensure that test requirements are met.

[0091] Step 5: Synchronize the data model

[0092] Obtain the data model of the monitoring system and ensure that the communication control module and the monitoring system use the same data model. Update or confirm the instantiation of data objects, such as logical nodes (LNs), data objects (DOs), etc.

[0093] Step 6: Execute the test case

[0094] Send simulated bay layer device signals or control commands according to the test case requirements. The control module should be able to simulate various working conditions, such as equipment start, stop, failure, etc.

[0095] Step 7: Real-time monitoring and feedback

[0096] Real-time monitoring of control commands issued by the monitoring system. According to the preset conditions of the test case, real-time feedback is provided on the commands of the monitoring system, such as main transmission gear position, switch position, bus voltage, reactive power, etc.

[0097] Step 8: Record communication logs

[0098] During the entire test process, all communication activities are recorded, including sent data, received data, timestamps, etc. The logs will be used for subsequent analysis and troubleshooting.

[0099] Through the above steps, the communication control module can establish a reliable communication connection with the substation monitoring system and perform corresponding operations according to the requirements of the test case, thereby verifying the functions and performance of the monitoring system.

[0100] According to the implementation mode of the present invention, the result verification module judges the correctness of the lock state change of the monitoring system equipment and the control instructions issued according to the control strategy and the lock principle, and compiles and generates a test report.

[0101] The control strategies include: tap adjustment principle, capacitor switching principle, and control instruction priority.

[0102] The locking principles include: station-level locking principle, main transformer locking principle, busbar locking principle, and capacitive reactor locking principle.

[0103] Specifically, the result verification module first receives the test data from the communication control module and the feedback information of the monitoring system, including the equipment status, the execution results of the control instructions, etc. Then, the module evaluates whether the control instructions of the monitoring system are correct according to the preset control strategy.

[0104] Regarding the tap adjustment principle: the result verification module will check whether the monitoring system correctly adjusts the main transformer tap according to the preset rules (such as voltage level, load conditions, etc.).

[0105] Regarding the capacitor switching principle: the result verification module verifies whether the monitoring system correctly switches the capacitor according to the prescribed principles (such as reactive power demand, power factor, etc.).

[0106] Regarding the priority of control instructions: the result verification module confirms whether the monitoring system correctly outputs the control instructions according to the prescribed principles (such as giving priority to adjusting the main transformer tap changer, giving priority to switching on and off the capacitor, etc.).

[0107] Regarding the station-level interlocking principle: the result verification module checks whether the monitoring system has correctly executed the interlocking operation when the station-level interlocking conditions are met, and interlocks the output of the entire station instruction.

[0108] For the main transformer locking principle: the result verification module verifies whether the monitoring system has locked the main transformer under specific conditions (such as main transformer overload, fault, etc.).

[0109] Regarding the busbar interlocking principle: the result verification module evaluates whether the monitoring system operates according to the interlocking principle when an abnormality occurs on the busbar (such as abnormal acquisition, exceeding reasonable limits, etc.).

[0110] For the capacitor lockout principle: the result verification module verifies whether the monitoring system correctly executes the lockout when the capacitor reaches the lockout condition (such as equipment failure, operation number limit, etc.).

[0111] Finally, the result verification module organizes the test results, including the execution status of control instructions, changes in the locking status of equipment, etc., and generates a detailed test report based on the test results. The report should include test items, execution results, abnormal conditions, locking operation records, etc.

[0112] The test report should provide an evaluation of the performance of the voltage and reactive power control functions of the monitoring system, point out existing problems and suggest improvement measures.

[0113] The implementation process of the voltage and reactive power control function verification method of the substation monitoring system is as follows: Figure 2 As shown, the following steps are included:

[0114] Step 1, obtain the SCD file from the monitoring system through the IEC61850 file service;

[0115] Step 2: extract the main transformer, busbar and capacitor models and their related secondary equipment parameters in the SCD file to form a test data model file containing the grid topology connection relationship, primary and secondary equipment association relationship, switch status model, measurement data model, switch control model and communication parameters;

[0116] Step 3, obtain the characteristic quantities such as the number of main transformers, winding type, wiring mode, parallel conditions, etc. from the test data model file, adapt them to the use case template, and obtain a typical use case template applicable to this model;

[0117] Step 4: Based on the characteristics of this model, consider the operating conditions such as main transformer separate operation, main transformer parallel operation, busbar separate operation, busbar parallel operation, busbar over-limit, equipment refusal to operate, and equipment locking, instantiate and convert the typical use case template to generate test cases;

[0118] Step 5, execute in sequence according to the test cases. Before executing each case, simulate the operating conditions first, and then provide real-time feedback output of the main transmission gear position, switch position, bus voltage, and reactive power according to the received monitoring system control instructions. The execution of this case is considered completed only when the control reaches the target or there is no instruction output.

[0119] Step 6, record and analyze the simulation conditions and monitoring system control execution in the use case execution, verify whether the monitoring system output instructions comply with the control strategy, whether the locking status of the system and equipment meets the requirements, and give the judgment result.

[0120] In summary, the present invention simulates the communication between the interval layer equipment and the monitoring system based on the IEC61850 communication protocol, generates a test data model by cutting and pasting the SCD file according to the application requirements, and standardizes the test data model. On the basis of the test model, a use case library is established, and the originally complex system-level test is integrated into the test platform, which simplifies the test environment construction and use case configuration. At the same time, no interface requirements are put forward for the monitoring system, and it is fully applicable to any on-site operating environment and has the operability of on-site implementation. Constructing use cases based on the use case library can realize iterative updates of use cases, and can better ensure the comprehensive coverage of detection items and the consistency of repeated operations. At the same time, the entire process is automatically executed by the verification platform, which reduces the probability of manual errors and greatly improves efficiency.

[0121] The present invention also provides a computer device, comprising one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and when the programs are executed by the processors, the steps of the substation monitoring system voltage and reactive power control strategy verification method as described above are implemented.

[0122] The present invention also provides a computer storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the voltage and reactive power control strategy verification method of the substation monitoring system as described above are implemented.

[0123] The present invention is applied to the on-site test of the voltage and reactive power control software functions of the substation monitoring system. It integrates the simulation and test functions, and uses IED simulation to perform virtual simulation of the substation bay layer equipment, thereby achieving seamless connection between the verification platform and the monitoring system. It uses simulation of typical scenarios to perform positive and negative verification of the control strategy and logic, and solves the problems of complex verification environment construction, difficulty in verifying some functions, and time-consuming and labor-intensive problems during on-site testing. It significantly improves the comprehensiveness and efficiency of the test and has broad promotion and application value.

[0124] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices (systems), computer equipment or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0125] The present invention is described with reference to a flowchart of a method according to an embodiment of the present invention. It should be understood that each process in the flowchart and a combination of processes in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A device that specifies functions in a process or multiple processes.

[0126] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A function specified in a process or multiple processes.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 The steps of a specified function in a process or multiple processes.

Claims

1. A voltage and reactive power control strategy verification platform for a substation monitoring system, characterized in that: include: A model generation tool is used to extract the main transformer, busbar, bus coupling, capacitor model and communication parameters related to reactive power control in the SCD model file of the substation monitoring system to form a test data model file, wherein the test data model file includes one or more of the following: power grid topology connection relationship, primary and secondary equipment association relationship, switch knife state model, measurement data model, switch control model and communication parameters; A use case generation module is used to match a pre-established use case template according to the main transformer feature quantity in the test data model, and generate a test case in combination with the power grid operation condition, wherein the main transformer feature quantity includes one or more of the number of main transformers, winding type, wiring mode, and parallel conditions; The communication control module is used to establish a communication connection with the substation monitoring system based on the generated test cases, automatically simulate different working conditions, and receive and feedback control instructions issued by the monitoring system in real time; The result verification module is used to judge the correctness of the lock state changes of the monitoring system equipment and the control instructions issued according to the control strategy and lock principle, and to organize and generate a test report; The human-computer interaction interface is used to dynamically display the test process data and graphically display the control strategy, locking status and judgment results of each test item.

2. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The model generation tool extracts the main transformer, busbar, bus coupling, capacitor reactor models and communication parameters related to reactive power control in the SCD model file of the substation monitoring system to form a test data model file, including: Read the SCD file, parse the file content into different element categories according to the IEC61850 standard, and store them in a temporary memory database; according to the structure of the pre-defined test data model file, classify the parsed device model and communication parameter data by category and store them in different table domain structures.

3. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The use case generation module matches the pre-defined use case template according to the main transformer characteristic quantity in the test data model, and generates test cases in combination with the grid operation conditions, including: Read the generated test data model file, extract the main transformer feature quantity, match the main transformer feature quantity with the variables in the use case template, adjust the test case according to the current operating conditions of the power grid, fill in the variables in the use case template, and generate a specific test case; Save the generated test cases to files or databases; The power grid operation conditions include: one or more of: main transformer separate operation, main transformer parallel operation, bus separate operation, bus parallel operation, bus over limit, equipment refusal to operate, and equipment locking.

4. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The use case template uses a fixed template reference name to describe the object, and uses this as a unique identifier to describe the use case.

5. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The communication control module establishes a communication connection with the substation monitoring system based on the generated test cases and automatically simulates different working conditions, including: Establish a communication connection with the substation monitoring system, set the communication port, address, and authentication information according to the communication parameters in the test data model, and send simulation signals to the monitoring system according to the working condition description in the test case to simulate different power grid operation states; Monitor the control instructions issued by the monitoring system in real time, process the received instructions, and feed back the results of the simulated working conditions or the response to the control instructions to the monitoring system; the real-time feedback of the control instructions includes one or more of the real-time feedback of the main transmission gear position, the real-time feedback of the switch position, the real-time feedback of the bus voltage, and the real-time feedback of the reactive power; After the test is completed, close the communication connection with the monitoring system.

6. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The control strategy includes: one or more of the following: tap adjustment principle, capacitor switching principle, and control instruction priority; The blocking principles include: one or more of the station-level blocking principle, the main transformer blocking principle, the busbar blocking principle, and the capacitive reactor blocking principle.

7. The voltage and reactive power control strategy verification platform of the substation monitoring system according to claim 1 is characterized in that: The test case consists of multiple groups of test items, each of which includes pre-conditions, test logic and evaluation principles; The preset conditions are used to describe the operating conditions that should be output before execution; The test logic is used to describe the execution content, including output signals, state switching logic, and state transition conditions; The evaluation principles are used to describe the content and expected status that should be determined after execution.

8. A method for verifying voltage and reactive power control strategy of a substation monitoring system, characterized in that: The following steps are involved: Step 1, obtain the SCD file from the monitoring system through the IEC61850 file service; Step 2, extract the main transformer, busbar and capacitor models and their related secondary equipment parameters in the SCD file to form a test data model file including the grid topology connection relationship, primary and secondary equipment association relationship, switch status model, measurement data model, switch control model and communication parameters; Step 3, obtain the number of main transformers, winding type, wiring mode, and parallel condition feature quantities from the test data model file, adapt them to the use case template, and obtain a typical use case template applicable to this model; Step 4: Based on the characteristics of this model, consider the main transformer separate operation, main transformer parallel operation, busbar separate operation, busbar parallel operation, busbar over-limit, equipment refusal to operate, and equipment locked operation conditions, instantiate and convert the typical use case template to generate test cases; Step 5: Execute the test cases in sequence. Before executing each test case, simulate the operating conditions first, and then provide real-time feedback output of the main transmission gear position, switch position, bus voltage, and reactive power according to the control instructions received from the monitoring system. The execution of this test case is considered completed only when the control reaches the target or no instructions are output; Step 6, record and analyze the simulation conditions and monitoring system control execution in the use case execution, verify whether the monitoring system output instructions comply with the control strategy, whether the locking status of the system and equipment meets the requirements, and give the judgment result.

9. A computer device, characterized in that: The device includes one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and when the programs are executed by the processors, the steps of the substation monitoring system voltage and reactive power control strategy verification method as described in claim 8 are implemented.

10. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the steps of the method for verifying voltage and reactive power control strategy of a substation monitoring system as claimed in claim 8 are implemented.

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