Pump storage power station generator-transformer unit protection test method and device, computer equipment

Abstract

The application relates to a pumped storage power station generator-transformer unit protection test method and device and computer equipment. The method comprises the following steps: in response to a test preparation operation of a generator-transformer unit protection device, determining a test case according to a preset test template library; according to the test case, testing the action response of the generator-transformer unit protection device under different unit operation conditions to obtain a unit condition test result; for different protection types of the pumped storage power station, testing the protection performance of the generator-transformer unit protection device to obtain a protection function test result; for different simulation fault types of the pumped storage power station, testing the fault response of the generator-transformer unit protection device to obtain a system fault test result; and analyzing the test results to obtain a test analysis result of the generator-transformer unit protection device. The method can improve the test efficiency of the generator-transformer unit protection device of the pumped storage power station.

Description

Technical Field

[0001] This application relates to the field of safety technology for pumped storage power stations, and in particular to a method, apparatus, computer equipment, readable storage medium, and computer program product for the protection testing of the generator-transformer unit of a pumped storage power station. Background Technology

[0002] Pumped storage units have multi-condition operation characteristics, including power generation, pumping, and SFC (Static Frequency Converter) start-up. The generator-transformer unit protection can monitor the unit's operating status at all times, ensuring the unit's safe and stable operation under various complex conditions.

[0003] The protection logic of the generator-transformer unit varies significantly under different operating conditions. However, in traditional technology, the testing method for the protection device of the generator-transformer unit in pumped storage power stations is still mainly manual testing. This testing method is inefficient, error-prone, time-consuming, labor-intensive, and has poor data traceability. It is difficult to cover the protection logic of pumped storage units under different operating conditions, and the switching between multiple operating conditions is quite complex. This results in low efficiency in the maintenance and testing of the protection device of the generator-transformer unit in pumped storage power stations, which makes it difficult to ensure the safe operation of pumped storage units in the power system and cannot meet the needs of the rapid development of pumped storage and the construction of digital and intelligent relay protection. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, readable storage medium, and computer program product for testing the protection of the generator-transformer unit of a pumped storage power station, in order to improve the testing efficiency of the protection device for the generator-transformer unit of a pumped storage power station.

[0005] In a first aspect, this application provides a method for testing the protection of a pumped storage power station's generator-transformer unit, the method comprising the following steps:

[0006] In response to the test-ready operation for the generator-transformer group protection device in the pumped storage power station, test cases for the generator-transformer group protection device are determined according to the preset test template library.

[0007] Based on the test cases, the action response of the generator-transformer protection device is tested for different unit operating conditions of the pumped storage power station to obtain the unit operating condition test results.

[0008] Based on the test cases, the protection performance of the generator-transformer protection device is tested for different protection types of the pumped storage power station, and the protection function test results are obtained.

[0009] Based on the test cases, the fault response of the generator-transformer group protection device is tested for different simulated fault types of the pumped storage power station to obtain the system fault test results.

[0010] The test results of the generator unit operating condition test, the protection function test, and the system fault test are analyzed to obtain the test analysis results of the generator-transformer unit protection device.

[0011] In one embodiment, the analysis of the unit operating condition test results, the protection function test results, and the system fault test results to obtain the test analysis results of the generator-transformer unit protection device includes:

[0012] The test results of the unit operating conditions, the test results of the protection functions, and the test results of the system faults are analyzed to extract the actual action parameters of the generator-transformer group protection device during the test process.

[0013] Obtain the theoretical rated value of the generator-transformer group protection device, identify the abnormal conditions of the generator-transformer group protection device based on the difference between the actual operating parameters and the theoretical rated value, and obtain error analysis results and abnormality analysis results;

[0014] Obtain the operating specifications of the generator-transformer group protection device, and determine the compliance of the actual operating parameters according to the operating specifications to obtain the compliance determination result;

[0015] The error analysis results, the anomaly analysis results, and the compliance determination results are used as the test analysis results.

[0016] In one embodiment, the step of testing the action response of the generator-transformer unit protection device under different unit operating conditions of the pumped storage power station according to the test cases, and obtaining the unit operating condition test results, includes:

[0017] The switching and electrical characteristics of the pumped storage power station are obtained, and the current operating condition of the pumped storage power station is identified by the generator-transformer unit protection device based on the switching and electrical characteristics.

[0018] According to the operating condition instructions for the current unit operating condition in the test case, test the action response of the generator-transformer protection device for the current unit operating condition, and obtain the current action response data corresponding to the current unit operating condition;

[0019] According to the operating condition switching sequence of the test case, the switching quantity characteristics and the electrical quantity characteristics are adjusted to switch the current unit operating condition to another unit operating condition that is different from the current unit operating condition.

[0020] Take the other unit operating condition as the new current unit operating condition, return to execute the step of testing the action response of the generator-transformer protection device for the current unit operating condition according to the operating condition command in the test case for the current unit operating condition, until the test for each unit operating condition in the operating condition switching sequence is completed, and obtain the current action response data corresponding to each unit operating condition.

[0021] The test results of the unit operating conditions are obtained based on the current action response data corresponding to the operating conditions of each unit.

[0022] In one embodiment, the step of testing the protection performance of the generator-transformer protection device for different protection types of the pumped storage power station according to the test cases, and obtaining the protection function test results, includes:

[0023] For each protection type, obtain the specific test parameters in the test cases that match the protection type;

[0024] Under different operating conditions of the generator units, electrical quantities and switching quantities corresponding to the protection type are applied to the generator-transformer unit protection device according to the specific test parameters, so as to obtain the protection action behavior signal of the generator-transformer unit protection device in response to the protection type;

[0025] The protection action behavior signal is verified to obtain the protection function test result.

[0026] In one embodiment, the step of testing the fault response of the generator-transformer group protection device for different simulated fault types of the pumped storage power station according to the test cases, and obtaining system fault test results, includes:

[0027] For each simulated fault type, obtain the fault simulation parameters corresponding to the simulated fault type in the test case;

[0028] Under different operating conditions of the generating units, based on the fault simulation parameters, electrical and switching quantities corresponding to the simulated fault type are applied to the pumped storage power station to obtain the response action signal of the generator-transformer unit protection device for the simulated fault type.

[0029] The response action signals are verified to obtain the system fault test results.

[0030] In one embodiment, the method further includes:

[0031] Based on the original state backup file of the generator-transformer group protection device, the parameters of the generator-transformer group protection device are restored to their original state before the test, and the restoration result is obtained; the original state backup file is a file generated by backing up the original state of the generator-transformer group protection device during the test-ready operation;

[0032] The recovery result is verified based on the original backup file to obtain the verification result;

[0033] If the verification results indicate that there is no deviation, in response to the restoration confirmation operation of the generator-transformer group protection device, a standardized test report is generated based on the test analysis results.

[0034] Secondly, this application provides a protection testing device for a pumped storage power station generator-transformer unit, the device comprising:

[0035] The test preparation module is used to respond to the test-ready operation for the generator-transformer group protection device in the pumped storage power station and determine the test cases for the generator-transformer group protection device according to the preset test template library.

[0036] The operating condition test module is used to test the action response of the generator-transformer group protection device according to the test cases, for different unit operating conditions of the pumped storage power station, and to obtain the unit operating condition test results.

[0037] The functional testing module is used to test the protection performance of the generator-transformer group protection device for different protection types of the pumped storage power station according to the test cases, and to obtain the protection function test results.

[0038] The system testing module is used to test the fault response of the generator-transformer group protection device for different simulated fault types of the pumped storage power station according to the test cases, and to obtain the system fault test results.

[0039] The results analysis module is used to analyze the unit operating condition test results, the protection function test results, and the system fault test results to obtain the test analysis results of the generator-transformer unit protection device.

[0040] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the above-described pumped storage power station generator-transformer group protection test method.

[0041] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0042] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method.

[0043] The aforementioned test method, apparatus, computer equipment, readable storage medium, and computer program product for the protection of generator-transformer units in pumped storage power stations, in response to test-ready operations for the protection devices of generator-transformer units in pumped storage power stations, determine test cases for the protection devices based on a preset test template library; based on the test cases, test the action response of the protection devices under different unit operating conditions of the pumped storage power station to obtain unit operating condition test results; based on the test cases, test the protection performance of the protection devices for different protection types of the pumped storage power station to obtain protection function test results; based on the test cases, test the fault response of the protection devices for different simulated fault types of the pumped storage power station to obtain system fault results. The test results are analyzed, including unit operating condition test results, protection function test results, and system fault test results, to obtain the test analysis results of the generator-transformer unit protection device. Based on the preset test template library, test cases can be automatically adapted to ensure that the test process fully covers various unit operating conditions and fault types of pumped storage power stations, as well as different protection types of generator-transformer unit protection devices. It can deeply simulate and verify the action response and handling of generator-transformer unit protection devices under different conditions, avoiding the one-sidedness of a single test dimension. By correlating and analyzing the test results of unit operating conditions, protection functions, and system faults, it can achieve cross-verification of the entire process of generator-transformer unit protection testing in pumped storage power stations, thereby significantly improving the testing efficiency of generator-transformer unit protection devices in pumped storage power stations. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an application environment diagram of a protection test method for a pumped storage power station generator-transformer unit in one embodiment.

[0046] Figure 2 This is a flowchart illustrating a protection test method for a pumped storage power station generator-transformer unit in one embodiment.

[0047] Figure 3 This is a flowchart illustrating the unit operating condition testing steps in one embodiment;

[0048] Figure 4 This is a flowchart illustrating a protection test method for a pumped storage power station generator-transformer unit in another embodiment.

[0049] Figure 5 This is a structural block diagram of a protection test device for a pumped storage power station generator-transformer unit in one embodiment.

[0050] Figure 6 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] The protection testing method for pumped storage power station generator-transformer units provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the generator-transformer unit in the pumped storage power station 102 is equipped with a generator-transformer unit protection device 104. A portable peripheral generator-transformer unit protection test device 106 can be used to test the generator-transformer unit protection device 104. The controller of the generator-transformer unit protection test device 106 can respond to the test-ready operation for the generator-transformer unit protection device 104 in the pumped storage power station 102, and determine the test cases for the generator-transformer unit protection device 104 according to the preset test template library. The controller of the generator-transformer unit protection test device 106 can test the action response of the generator-transformer unit protection device 104 under different unit operating conditions of the pumped storage power station 102 according to the test cases, and obtain the unit operating condition test results. The controller of the generator-transformer unit protection test device 106 can test the action response of the generator-transformer unit protection device 104 under different unit operating conditions of the pumped storage power station 102 according to the test cases. 04. For different protection types of the pumped storage power station 102, the protection performance of the generator-transformer group protection device 104 is tested to obtain the protection function test results; the controller of the generator-transformer group protection test device 106 can test the fault response of the generator-transformer group protection device 104 according to the test cases for different simulated fault types of the pumped storage power station 102 to obtain the system fault test results; the controller of the generator-transformer group protection test device 106 can analyze the unit operating condition test results, protection function test results, and system fault test results to obtain the test analysis results of the generator-transformer group protection device 104.

[0053] Understandably, the generator-transformer unit protection device 104 is a microprocessor-based protection system used to ensure the safe operation of the generator-transformer unit (i.e., the generator-transformer unit) in the pumped storage power station 102. Its main function is to monitor and protect the generator and main transformer as a unified unit, quickly disconnecting faults when equipment malfunctions or abnormalities occur, preventing the accident from escalating. It is a crucial barrier for the safe operation of the core equipment of the pumped storage power station.

[0054] The generator-transformer protection test device 106 is a special equipment used to verify, debug and periodically test the generator-transformer protection device. It mainly simulates various fault conditions to verify the accuracy and timing of the protection action. It can be a portable tester for external devices.

[0055] Optionally, the generator-transformer protection test device can simulate a 12-phase voltage signal source and an 18-phase current signal source. Each phase voltage or current should be independently configurable, and the type can be AC ​​or DC, with independent and continuous adjustment of amplitude, phase, and frequency. It supports importing the entire substation configuration SCD file (Substation Configuration Description) to extract the instance configuration information required for testing. It also supports automatic configuration of sending and receiving SV messages (Sampled Value) and GOOSE messages (Generic ObjectOriented Substation Event) based on IED (Intelligent Electronic Device) devices.

[0056] In one exemplary embodiment, such as Figure 2 As shown, a protection test method for a pumped storage power station generator-transformer unit is provided. This embodiment applies this method to... Figure 1 The controller (or main control computing unit) of the generator-transformer group protection test device 106 is illustrated as an example. In this embodiment, the method includes the following steps S202 to S210. Wherein:

[0057] Step S202: In response to the test-ready operation for the generator-transformer protection device in the pumped storage power station, test cases for the generator-transformer protection device are determined according to the preset test template library.

[0058] The test template library can be a set of standardized test templates pre-set based on relevant standards for protection testing of generator-transformer units in pumped storage power stations. The test templates can pre-set test cases, configurable test parameters, test configuration parameters, protection settings, control words and other information. They can cover test cases for different operating conditions of generator-transformer units in pumped storage power stations, such as shutdown, power generation, pumping, power generation phase adjustment, pumping phase adjustment, driving, being driven, and electrical braking, and cover different protection functions of generator-transformer unit protection devices, such as differential protection, reverse power protection, over-excitation protection, grounding protection, and impedance protection.

[0059] In practical applications, the controller of the generator-transformer protection test device 106 can complete the self-test of the test circuit wiring between the generator-transformer protection test device 106 and the generator-transformer protection device 104, and confirm that the test circuits such as voltage and current circuits and switching quantity circuits are connected normally. After confirming that the test preparation for the generator-transformer protection device 104 under test is complete, the controller of the generator-transformer protection test device 106 can intelligently load matching test templates based on the preset test template library. According to the basic parameters of the protection device such as the equipment model, setting table, and pressure plate configuration table of the generator-transformer protection device 104 under test, as well as the basic parameters of the pumped storage power station unit such as the rated capacity, voltage level, and transformer ratio, the controller can automatically verify the compatibility between the template parameters and the basic parameters of the unit and the protection device, determine the test cases for the generator-transformer protection device, and generate a test case sequence list.

[0060] During the testing of the generator-transformer unit protection device, the controller of the generator-transformer unit protection test device 106 can automatically modify the protection device settings, activate the corresponding test pressure plate, configure control words, etc., according to the preset parameters of the test cases, and inject switch quantities such as GCB (Generator Circuit Breaker), commutation knife, starting knife, drag knife, and neutral point position, as well as analog electrical quantities such as the low-voltage side current and voltage of the main transformer, the current and voltage of the generator terminal side, and the current and voltage of the neutral point side. It also collects protection action signals such as trip output GCB, excitation switch, trip SFC (Static Frequency Converter) switch, trip plant high-voltage transformer switch, main transformer high-voltage side switch, adjacent units, adjacent main transformers, fire protection start, monitoring start, and emergency shutdown.

[0061] Meanwhile, the controller of the generator-transformer protection test device 106 can also automatically read the current setting value, pressure plate, control word status and other parameters of the generator-transformer protection device 104, back up the original state of the generator-transformer protection device, and generate an original state backup file.

[0062] Step S204: Based on the test cases, test the action response of the generator-transformer protection device for different operating conditions of the pumped storage power station, and obtain the unit operating condition test results.

[0063] In practical implementation, for different typical pumped storage operating conditions such as shutdown, power generation, pumping, power generation phase adjustment, and pumping phase adjustment of the generator-transformer unit in a pumped storage power station, the controller of the generator-transformer unit protection test device 106 can automatically identify and switch the unit operating conditions of the generator-transformer unit based on the preset operating condition commands in the test cases and the characteristics of the collected switch quantities and electrical quantities of the generator-transformer unit. It can automatically execute the corresponding test steps for different operating conditions, test the action response of the generator-transformer unit protection device, and simultaneously collect the action response data of the generator-transformer unit protection device 104 to obtain the unit operating condition test results.

[0064] Step S206: Based on the test cases, test the protection performance of the generator-transformer protection device for different protection types of pumped storage power stations, and obtain the protection function test results.

[0065] Because the standards related to pumped storage generator-transformer unit protection specify a variety of protection functions or types for generator-transformer unit protection devices, and the action criteria, blocking logic, and output methods for each type of protection are mostly inconsistent, in practical applications, for different protection types of pumped storage power stations, the controller of the generator-transformer unit protection test device 106 can perform differentiated setting verification and action characteristic tests on the generator-transformer unit protection device 104 based on the preset fault parameters, scan step size, and other test parameters and test instructions in the test cases, and based on the preset setting parameters and action characteristic requirements of various protection types, to test the protection performance of the generator-transformer unit protection device and obtain the protection function test results.

[0066] Step S208: Based on the test cases, test the fault response of the generator-transformer group protection device for different simulated fault types of the pumped storage power station, and obtain the system fault test results.

[0067] In its specific implementation, the controller of the generator-transformer unit protection test device 106 can construct simulated electrical quantities corresponding to various simulated fault types for different simulated fault types of pumped storage power stations, according to the grid fault simulation parameters in the test cases, as well as system operating condition parameters such as reclosing, oscillation, and synchronization. It can also inject corresponding simulated electrical quantity signals into the generator-transformer unit protection device 104 to test the fault response of the generator-transformer unit protection device, verify the fault response of the generator-transformer unit protection device 104 in response to various fault types, the overall action logic, and the coordination logic with the circuit breaker and the demagnetization system, and obtain the system fault test results.

[0068] Step S210: Analyze the unit operating condition test results, protection function test results, and system fault test results to obtain the test analysis results of the generator-transformer unit protection device.

[0069] As an example, the test results of unit operating condition test, protection function test, and system fault test are analyzed to obtain the test analysis results of the generator-transformer unit protection device. This includes: parsing the test results of unit operating condition test, protection function test, and system fault test to extract the actual operating parameters of the generator-transformer unit protection device during the test; obtaining the theoretical rated values ​​of the generator-transformer unit protection device; identifying abnormal conditions of the generator-transformer unit protection device based on the difference between the actual operating parameters and the theoretical rated values, and obtaining error analysis results and anomaly analysis results; obtaining the operating specifications of the generator-transformer unit protection device; determining the compliance of the actual operating parameters according to the operating specifications, and obtaining compliance determination results; and using the error analysis results, anomaly analysis results, and compliance determination results as the test analysis results.

[0070] For example, the controller of the generator-transformer unit protection testing device 106 can automatically analyze the unit operating condition test results, protection function test results, and system fault test results based on the raw data from the entire testing process. It can extract the actual operating parameters of the generator-transformer unit protection device during the test, such as the operating time, operating value, and return value. Based on the theoretical rated values ​​of the generator-transformer unit protection device, it automatically compares the differences between the actual operating parameters and the theoretical rated values, calculates the error rate, false operation rate, or failure to operate rate, and identifies abnormal situations such as protection failure to operate, false operation, and operation timeout of the generator-transformer unit protection device. It can obtain a test data error analysis table as the error analysis result and an abnormal event location and cause analysis report as the abnormality analysis result. Furthermore, based on the technical specifications and operating criterion requirements of the generator-transformer unit protection device, it obtains the operating specifications of the generator-transformer unit protection device, verifies whether the actual operating parameters are compliant according to the operating specifications, and obtains a compliance judgment result. Finally, the error analysis result, abnormality analysis result, and compliance judgment result are used as the test analysis result to meet the archiving and review requirements of pumped storage generator-transformer unit protection testing.

[0071] The aforementioned test method for generator-transformer unit protection in pumped storage power stations involves the following steps: Responding to a test-ready operation for the generator-transformer unit protection device in the pumped storage power station, test cases are determined for the protection device based on a pre-set test template library. Based on these test cases, the action response of the generator-transformer unit protection device is tested under different unit operating conditions of the pumped storage power station, yielding unit operating condition test results. Based on the test cases, the protection performance of the generator-transformer unit protection device is tested for different protection types of the pumped storage power station, yielding protection function test results. Based on the test cases, the fault response of the generator-transformer unit protection device is tested for different simulated fault types of the pumped storage power station, yielding system fault test results. The method also includes unit operating condition testing. The test results, protection function test results, and system fault test results are analyzed to obtain the test analysis results of the generator-transformer unit protection device. Based on the preset test template library, test cases can be automatically adapted to ensure that the test process fully covers various unit operating conditions and fault types of pumped storage power stations, as well as different protection types of generator-transformer unit protection devices. It can deeply simulate and verify the action response and handling of generator-transformer unit protection devices under different conditions, avoiding the one-sidedness of a single test dimension. By correlating and analyzing the test results of unit operating conditions, protection functions, and system faults, it can achieve cross-verification of the entire process of generator-transformer unit protection testing in pumped storage power stations, thereby significantly improving the testing efficiency of generator-transformer unit protection devices in pumped storage power stations.

[0072] In one exemplary embodiment, such as Figure 3 The flowchart shown illustrates the unit operating condition test steps. Based on the test cases, for different operating conditions of the pumped storage power station units, the action response of the generator-transformer protection device is tested to obtain the unit operating condition test results, including the following steps S302 to S310:

[0073] Step S302: Obtain the switching and electrical characteristics of the pumped storage power station, and identify the current operating condition of the pumped storage power station based on the switching and electrical characteristics through the generator-transformer unit protection device.

[0074] Step S304: According to the operating condition instructions in the test case for the current unit operating condition, test the action response of the generator-transformer protection device for the current unit operating condition, and obtain the current action response data corresponding to the current unit operating condition.

[0075] Step S306: According to the operating condition switching sequence of the test case, adjust the switch quantity characteristics and electrical quantity characteristics to switch the current unit operating condition to another unit operating condition that is different from the current unit operating condition.

[0076] Step S308: Take the operating condition of another unit as the new current operating condition of the unit, return to execute the step of testing the action response of the generator-transformer protection device for the current operating condition according to the operating condition command in the test case for the current operating condition of the unit, until the test for each operating condition of the unit in the operating condition switching sequence is completed, and obtain the current action response data corresponding to each operating condition of the unit.

[0077] Step S310: Obtain the unit operating condition test results based on the current action response data corresponding to the operating conditions of each unit.

[0078] For example, the controller of the generator-transformer protection test device 106 can verify whether the unit operating condition determined by the generator-transformer protection device is consistent with the expectation based on the hard-contact electrical signals such as voltage, current, and frequency issued by the pumped storage power station monitoring system, as well as the combination signals of switching quantities such as phase-changing switches, drive switches, driven switches, electric brake switches, and generator-end circuit breakers, and identify the current unit operating condition of the pumped storage power station.

[0079] Then, according to the operating condition instructions in the test cases for the current unit operating condition, test the action response of the generator-transformer unit protection device for the current unit operating condition, and obtain the current action response data such as the action value, return value, action time, and blocking logic corresponding to the current unit operating condition. For example, for the power generation condition, the conventional hydro-generator-transformer unit protection verification method can be referred to to perform differential, stator grounding, overcurrent, overvoltage, loss of excitation, loss of synchronism, and frequency protection, etc.; for the pumping condition, the secondary circuit of the CT (Current Transformer) can be switched by the auxiliary contacts of the phase switching switch, or differential protection can be set up for power generation / pumping, focusing on verifying the wiring switching logic of the differential protection after phase sequence reversal; for the phase-changing condition of power generation or pumping, verify the action value of the generator-transformer unit protection device for electrical quantities in an almost zero-current state, that is, when the active power is about 0.

[0080] The operating condition switching sequence in the test cases can be configured with multiple programmable operating condition test sequences. The conditions triggering the state switching can be set to time triggering, input triggering, manual triggering, and pulse triggering. Furthermore, the controller of the generator-transformer unit protection test device 106 can adjust the switching and electrical characteristics based on the RTDS (Real-Time Digital Simulation) digital simulation system according to the operating condition switching sequence. Through signal commands such as phase changer position, GCB opening and closing, current and voltage phase sequence, and power direction, the current unit operating condition is switched to another unit operating condition different from the current unit operating condition. For each unit operating condition in the operating condition switching sequence, according to the operating condition commands in the test cases for each unit operating condition, the action response of the generator-transformer unit protection device for each unit operating condition is tested to obtain the unit operating condition test results.

[0081] As a possible example, based on test cases, the protection performance of the generator-transformer protection device for different protection types of pumped storage power stations is tested to obtain protection function test results. This includes: for each protection type, obtaining specific test parameters matching the protection type in the test cases; applying electrical and switching quantities corresponding to the protection type to the generator-transformer protection device under different unit operating conditions according to the specific test parameters to obtain the protection action behavior signal of the generator-transformer protection device in response to the protection type; and verifying the protection action behavior signal to obtain the protection function test results.

[0082] In its specific implementation, the controller of the generator-transformer unit protection test device 106 can acquire specific test parameters matching the protection type in the test cases for each protection type. For example, the current setting value for overcurrent protection, the impedance setting value for distance protection, and the voltage setting value for overvoltage protection. Under different unit operating conditions, based on the specific test parameters, the controller applies electrical quantities corresponding to the protection type to the generator-transformer unit protection device 104 and adjusts the relevant control words. It injects corresponding switching quantities and electrical quantities according to the protection type under different unit operating conditions, and synchronously collects the action value, return value, action time, etc. of the generator-transformer unit protection device in real time to obtain the protection action behavior signal of the generator-transformer unit protection device 104 in response to the protection type. Based on the preset setting parameters and action characteristic requirements of various protection types, the controller performs setting value verification and action characteristic testing on the protection action behavior signal to obtain the protection function test results.

[0083] For example, for differential protection types, the corresponding voltage and current fault waveforms can be automatically output according to the test parameters preset in the test cases, such as fault phase, fault impedance, and fault time; the action messages and trip output signals of the generator-transformer group protection devices can be collected in real time; the action behavior of differential protection and overcurrent protection can be automatically verified, and the correctness, action time, action sensitivity, and coordination logic with the circuit breaker tripping circuit of differential protection can be verified.

[0084] For example, for excitation-related protection types, the corresponding rotor voltage and stator voltage and current waveforms can be output according to the test parameters related to loss of excitation protection and overexcitation protection in the test cases; the protection action behavior signals of the generator-transformer group protection device for loss of excitation protection, overexcitation protection, etc. can be collected in real time; the action boundary and asynchronous boundary impedance characteristics of the protection can be automatically verified, and the system low excitation limit coordination logic of loss of excitation protection and the inverse time limit action characteristics of overexcitation protection can be verified.

[0085] As one possible implementation, based on test cases, the fault response of the generator-transformer unit protection device is tested for different simulated fault types in the pumped storage power station to obtain system fault test results. This includes: obtaining the fault simulation parameters corresponding to each simulated fault type in the test cases; applying electrical and switching quantities corresponding to the simulated fault type to the pumped storage power station under different unit operating conditions based on the fault simulation parameters to obtain the response action behavior signals of the generator-transformer unit protection device for the simulated fault type; and verifying the response action behavior signals to obtain system fault test results.

[0086] In its implementation, the controller of the generator-transformer protection test device 106 can acquire the fault simulation parameters corresponding to each simulated fault type in the test case, such as electrical quantities, switching quantities, and fault triggering conditions under the fault states corresponding to fault types like stator grounding, rotor grounding, inter-turn short circuit, phase-to-phase short circuit, overload, overexcitation, loss of excitation, and loss of synchronism. Under different unit operating conditions, based on the fault simulation parameters, it applies simulated electrical quantities corresponding to the simulated fault types to the pumped storage power station. After each fault simulation electrical quantity injection, it synchronously collects the protection action signals, action times, fault waveforms, and output matrix execution actions of the generator-transformer protection device 104 to obtain the response action behavior signals of the generator-transformer protection device 104 for the simulated fault types. It verifies the response action behavior signals to verify the fault response of the generator-transformer protection device 104 for each fault type, the overall action logic, and the coordination logic with the circuit breaker and de-excitation system, and obtains the system fault test results.

[0087] For example, regarding overexcitation fault types, pumped storage units face significant low-frequency or overvoltage risks due to SFC startup, load shedding, and phase-adjusting pressurization. According to relevant standards, the generator-transformer unit protection device must operate normally across the entire 10-65Hz frequency range for overexcitation protection. The controller of the generator-transformer unit protection test device 106 can, according to the overexcitation multiple in the test case, either by maintaining a constant frequency and increasing the voltage, or by maintaining a constant protection voltage and decreasing the frequency, cause the U / f ratio of the generator-transformer unit protection device to exceed the limit. This allows the response action value and action time of the generator-transformer unit protection device to be collected, verifying the inverse-time action characteristics of the generator-transformer unit response.

[0088] For example, regarding winding grounding fault types, for stator winding grounding faults, the system can automatically output corresponding zero-sequence voltage and current waveforms based on preset fault phase, grounding resistance, and fault time. It can also collect the grounding protection action signal of the protection device in real time, automatically verifying the grounding protection's action threshold and action time to verify the sensitivity, selectivity, and operational reliability of the stator grounding protection under high-resistance grounding faults. For rotor winding grounding faults, the system can simulate single-point and two-point grounding faults in the rotor winding, outputting corresponding rotor voltage and current waveforms. It can also collect the rotor grounding protection action signal in real time, automatically verifying the rotor grounding protection's action logic, alarm and trip thresholds to verify the fault identification capability, action threshold accuracy, and rapid action capability for two-point grounding faults.

[0089] In an exemplary embodiment, the method further includes: restoring the parameters of the generator-transformer group protection device to their original state before testing based on the original state backup file of the generator-transformer group protection device, and obtaining a restoration result; verifying the restoration result based on the original state backup file, and obtaining a verification result; and generating a standardized test report based on the test analysis result in response to the restoration confirmation operation of the generator-transformer group protection device if there is no deviation in the verification result characterization.

[0090] The original state backup file is a file generated by backing up the original state of the generator-transformer group protection device during the test-ready operation.

[0091] In practical applications, the controller of the generator-transformer unit protection test device 106 can automatically restore the original settings, pressure plates, control word configurations, and other parameters of the generator-transformer unit protection device to their original state before testing based on the original state backup file of the generator-transformer unit protection device, thus obtaining the restoration result; it can automatically verify the restoration result based on the original parameters in the original state backup file, thus obtaining the verification result; if the verification result indicates no deviation, it can confirm that the restoration result has no configuration deviation and generate a protection device configuration restoration confirmation report; in response to the restoration confirmation operation of the generator-transformer unit protection device, it can generate a complete standardized test report based on the test analysis results, including test overview, test case execution status, test results, anomaly analysis, rectification suggestions, etc., so that it can be directly used for power plant maintenance archiving.

[0092] For the convenience of those skilled in the art, Figure 4 This paper provides an example of a comprehensive testing procedure for the generator-transformer unit protection device in a pumped storage power station. See below for reference. Figure 4 This document describes in detail a protection test method for a pumped storage power station's generator-transformer unit using a specific embodiment. It is important to understand that the following description is merely illustrative and not intended to limit the scope of the application.

[0093] Step S401, Test Preparation Phase. The controller of the generator-transformer group protection test device 106 can respond to the test-ready operation for the generator-transformer group protection device in the pumped storage power station and determine the test cases for the generator-transformer group protection device according to the preset test template library.

[0094] Step S402, Operating Condition Identification and Testing Phase. The controller of the generator-transformer unit protection testing device 106 can test the action response of the generator-transformer unit protection device according to the test cases for different unit operating conditions of the pumped storage power station, and obtain the unit operating condition test results.

[0095] Step S403, Protection Function Specific Testing Phase. The controller of the generator-transformer group protection testing device 106 can test the protection performance of the generator-transformer group protection device for different protection types of pumped storage power stations according to the test cases, and obtain the protection function test results.

[0096] Step S404, the overall group and system testing phase. The controller of the generator-transformer group protection test device 106 can test the fault response of the generator-transformer group protection device according to the test cases for different simulated fault types of the pumped storage power station, and obtain the system fault test results.

[0097] Step S405, Data Processing and Analysis Stage. The controller of the generator-transformer unit protection test device 106 can analyze the unit operating condition test results, protection function test results, and system fault test results to obtain the test analysis results of the generator-transformer unit protection device.

[0098] Step S406, Test Completion and Recovery Phase. The controller of the generator-transformer group protection test device 106 can restore the parameters of the generator-transformer group protection device to the original state before the test according to the original state backup file of the generator-transformer group protection device, and obtain the recovery result; according to the original state backup file, the recovery result is verified to obtain the verification result; if there is no deviation in the verification result characterization, in response to the recovery confirmation operation of the generator-transformer group protection device, a standardized test report is generated according to the test analysis results.

[0099] It should be noted that the specific limitations of the above steps can be found in the above-described specific limitations of a test method for the protection of a pumped storage power station generator-transformer unit.

[0100] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0101] Based on the same inventive concept, this application also provides a pumped storage power station generator-transformer group protection testing device for implementing the above-mentioned pumped storage power station generator-transformer group protection testing method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the pumped storage power station generator-transformer group protection testing device provided below can be found in the limitations of the pumped storage power station generator-transformer group protection testing method described above, and will not be repeated here.

[0102] In an exemplary embodiment, as shown in FIG5, a protection test device for a pumped storage power station generator-transformer unit is provided, comprising:

[0103] Test preparation module 510 is used to respond to the test-ready operation for the generator-transformer group protection device in a pumped storage power station and determine test cases for the generator-transformer group protection device according to a preset test template library.

[0104] The operating condition test module 520 is used to test the action response of the generator-transformer protection device according to the test cases for different operating conditions of the pumped storage power station, and obtain the unit operating condition test results.

[0105] The functional test module 530 is used to test the protection performance of the generator-transformer protection device for different protection types of pumped storage power stations according to test cases, and to obtain the protection function test results.

[0106] The system test module 540 is used to test the fault response of the generator-transformer group protection device according to the test cases and different simulated fault types of the pumped storage power station, and to obtain the system fault test results.

[0107] The results analysis module 550 is used to analyze the test results of the unit operating conditions, protection function test results, and system fault test results to obtain the test analysis results of the generator-transformer unit protection device.

[0108] Each module in the aforementioned pumped storage power station generator-transformer protection test device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0109] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 6 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a protection test method for a pumped storage power station's generator-transformer unit.

[0110] Those skilled in the art will understand that Figure 6The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0111] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the various embodiments of the pumped storage power station generator-transformer group protection test method described above.

[0112] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps in the various embodiments of the pumped storage power station generator-transformer group protection test method described above.

[0113] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in various embodiments of the above-described pumped storage power station generator-transformer group protection test method.

[0114] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic resistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence processors, etc., and are not limited to these.

[0115] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0116] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for testing the protection of a generator-transformer unit in a pumped storage power station, characterized in that, The method includes: In response to the test-ready operation for the generator-transformer group protection device in the pumped storage power station, test cases for the generator-transformer group protection device are determined according to the preset test template library. Based on the test cases, the action response of the generator-transformer protection device is tested for different unit operating conditions of the pumped storage power station to obtain the unit operating condition test results. Based on the test cases, the protection performance of the generator-transformer protection device is tested for different protection types of the pumped storage power station, and the protection function test results are obtained. Based on the test cases, the fault response of the generator-transformer group protection device is tested for different simulated fault types of the pumped storage power station to obtain the system fault test results. The test results of the generator unit operating condition test, the protection function test, and the system fault test are analyzed to obtain the test analysis results of the generator-transformer unit protection device.

2. The method according to claim 1, characterized in that, The analysis of the unit operating condition test results, the protection function test results, and the system fault test results yields the test analysis results of the generator-transformer unit protection device, including: The test results of the unit operating conditions, the test results of the protection functions, and the test results of the system faults are analyzed to extract the actual action parameters of the generator-transformer group protection device during the test process. Obtain the theoretical rated value of the generator-transformer group protection device, identify the abnormal conditions of the generator-transformer group protection device based on the difference between the actual operating parameters and the theoretical rated value, and obtain error analysis results and abnormality analysis results; Obtain the operating specifications of the generator-transformer group protection device, and determine the compliance of the actual operating parameters according to the operating specifications to obtain the compliance determination result; The error analysis results, the anomaly analysis results, and the compliance determination results are used as the test analysis results.

3. The method according to claim 1, characterized in that, The step involves testing the action response of the generator-transformer unit protection device under different operating conditions of the pumped storage power station according to the test cases, and obtaining the unit operating condition test results, including: The switching and electrical characteristics of the pumped storage power station are obtained, and the current operating condition of the pumped storage power station is identified by the generator-transformer unit protection device based on the switching and electrical characteristics. According to the operating condition instructions for the current unit operating condition in the test case, test the action response of the generator-transformer protection device for the current unit operating condition, and obtain the current action response data corresponding to the current unit operating condition; According to the operating condition switching sequence of the test case, the switching quantity characteristics and the electrical quantity characteristics are adjusted to switch the current unit operating condition to another unit operating condition that is different from the current unit operating condition. Take the other unit operating condition as the new current unit operating condition, return to execute the step of testing the action response of the generator-transformer protection device for the current unit operating condition according to the operating condition command in the test case for the current unit operating condition, until the test for each unit operating condition in the operating condition switching sequence is completed, and obtain the current action response data corresponding to each unit operating condition. The test results of the unit operating conditions are obtained based on the current action response data corresponding to the operating conditions of each unit.

4. The method according to claim 1, characterized in that, According to the test cases, the protection performance of the generator-transformer protection device is tested for different protection types of the pumped storage power station, and the protection function test results are obtained, including: For each protection type, obtain the specific test parameters in the test cases that match the protection type; Under different operating conditions of the generator units, electrical quantities and switching quantities corresponding to the protection type are applied to the generator-transformer unit protection device according to the specific test parameters, so as to obtain the protection action behavior signal of the generator-transformer unit protection device in response to the protection type; The protection action behavior signal is verified to obtain the protection function test result.

5. The method according to claim 1, characterized in that, The test involves evaluating the fault response of the generator-transformer unit protection device for different simulated fault types in the pumped storage power station based on the test cases, and obtaining system fault test results, including: For each simulated fault type, obtain the fault simulation parameters corresponding to the simulated fault type in the test case; Under different operating conditions of the generating units, based on the fault simulation parameters, electrical and switching quantities corresponding to the simulated fault type are applied to the pumped storage power station to obtain the response action signal of the generator-transformer unit protection device for the simulated fault type. The response action signals are verified to obtain the system fault test results.

6. The method according to claim 1, characterized in that, The method further includes: Based on the original state backup file of the generator-transformer group protection device, the parameters of the generator-transformer group protection device are restored to their original state before the test, and the restoration result is obtained; the original state backup file is a file generated by backing up the original state of the generator-transformer group protection device during the test-ready operation; The recovery result is verified based on the original backup file to obtain the verification result; If the verification results indicate that there is no deviation, in response to the restoration confirmation operation of the generator-transformer group protection device, a standardized test report is generated based on the test analysis results.

7. A protection testing device for a pumped storage power station's generator-transformer unit, characterized in that, The device includes: The test preparation module is used to respond to the test-ready operation for the generator-transformer group protection device in the pumped storage power station and determine the test cases for the generator-transformer group protection device according to the preset test template library. The operating condition test module is used to test the action response of the generator-transformer group protection device according to the test cases, for different unit operating conditions of the pumped storage power station, and to obtain the unit operating condition test results. The functional testing module is used to test the protection performance of the generator-transformer group protection device for different protection types of the pumped storage power station according to the test cases, and to obtain the protection function test results. The system testing module is used to test the fault response of the generator-transformer group protection device for different simulated fault types of the pumped storage power station according to the test cases, and to obtain the system fault test results. The results analysis module is used to analyze the unit operating condition test results, the protection function test results, and the system fault test results to obtain the test analysis results of the generator-transformer unit protection device.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

Images