Method and device for testing power system stabilizer (PSS) in water-turbine generator set

Abstract

The invention provides a method and device for testing a power system stabilizer (PSS) in a water-turbine generator set, and relates to the technical field of water-turbine generator tests.The method comprises the steps that a speed regulator comprehensive tester is connected into a plurality of signal generating devices, and the signal generating devices are used for testing the water-turbine generator set; all devices and subsystems in the water-turbine generator set are checked, and it is determined that experiment conditions are met; enabling the water-turbine generator set to operate in an automatic control mode, closing a power system stabilizer (PSS) function, and carrying out automatic voltage control (AVR) off-line and on-line reference voltage step response tests; an AVR online voltage step and pulse response test is carried out; and testing the gain margin. By testing the water-turbine generator set, the generator model, the excitation system model and the PSS function are verified, and the operation safety of the water-turbine generator set is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydro-generator testing, and in particular to a testing method and device for a power system stabilizer PSS in a hydro-generator set. Background Art

[0002] Hydropower is an environmentally friendly, reusable green energy. With the continuous increase in the capacity of hydropower generators, their safety and economy are becoming increasingly important. The turbine generator set is the most critical main equipment of a hydropower station. Once an accident occurs in a hydropower generator set, it will affect the normal operation of the unit at the least, or damage the unit equipment at the worst, and even affect the safety and stability of the power grid. Therefore, it is of great significance to monitor the status of the turbine generator set to ensure the safe, reliable and stable operation of the hydropower generator set and maximize the power generation efficiency.

[0003] At present, the test items of the test process of the hydro-turbine generator set are relatively simple, and it is difficult to comprehensively test the control performance of the hydro-turbine generator set, which reduces the safety of the operation of the hydro-turbine generator set. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first objective of the present application is to propose a testing method for a power system stabilizer PSS in a hydro-turbine generator set.

[0006] The second object of the present application is to provide a device.

[0007] The third objective of the present application is to provide an electronic device.

[0008] A fourth objective of the present application is to provide a computer-readable storage medium.

[0009] A fifth object of the present application is to provide a computer program product.

[0010] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a testing method for a power system stabilizer PSS in a hydro-generator set, comprising:

[0011] Connecting the speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing the hydro-generator set;

[0012] Check each device and subsystem in the hydro-generator set to ensure that the experimental conditions are met;

[0013] The hydro-generator set is operated in an automatic control mode, the power system stabilizer PSS function is turned off, and an automatic voltage control AVR offline and online reference voltage step response test is performed;

[0014] The hydro-generator set is operated in an automatic control mode and the PSS function is turned on to perform an AVR online voltage step and pulse response test;

[0015] The hydro-generator set is operated in an automatic control mode and the PSS function is turned on to perform a gain margin test.

[0016] Optionally, the speed regulator comprehensive tester is connected to multiple signal generating devices, including:

[0017] Connecting the speed regulator comprehensive tester to a power sensor device, wherein the power sensor device is used to generate a feedback signal according to the power of the power transmitter;

[0018] The speed governor comprehensive tester is connected to a guide vane opening signal generating device, wherein the guide vane opening signal generating device is used to generate a feedback signal according to the guide vane displacement;

[0019] The speed governor comprehensive tester is connected to a blade opening signal generating device, wherein the blade opening signal generating device is used to generate a feedback signal according to the blade displacement;

[0020] The speed regulator comprehensive tester is connected to a motor frequency detection device, and the motor frequency detection device is used to generate a feedback signal according to the original machine frequency voltage transformer signal of the speed regulator electrical cabinet or the frequency of the relay protection instrument.

[0021] Optionally, the inspection of each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met includes:

[0022] Check and set the programs and parameters of the excitation control system, speed regulator electrical cabinet, mechanical cabinet and hydraulic device control cabinet according to the normal operating parameters;

[0023] Check and make sure that the governor oil pressure device has built up pressure, the pressure, oil level and oil quality are normal, the display of each meter is normal, the valve is opened and closed in place according to the operation requirements, and the oil pump and air supply device are working normally;

[0024] Check and make sure that the safety valve of the pressure oil tank is working properly, the pressure oil pump is operating normally under the working pressure, there is no abnormal vibration and heating phenomenon, the switching and manual and automatic operation of the main and auxiliary oil pumps are normal, and the manual and automatic functions of the air supply device are normal;

[0025] Check and make sure the oil level display of the oil collecting device is normal, the manual and automatic operation of the oil pump is normal, and there is no abnormal vibration or heat.

[0026] Check and make sure that the mechanical and hydraulic converters of the speed governor are working properly;

[0027] Check and make sure that the weight device, segment closing device, etc. are working properly, and the solenoid valve is not stuck;

[0028] Check and make sure the locking spindle throwing and retracting functions are normal, the clearance between the shaft and the pin sleeve meets the requirements, and there is no friction or collision;

[0029] Check and make sure that there is no leakage in the pipelines, valves, joints and other parts of the speed control system, and all parts have been cleaned;

[0030] Check and make sure that the water guide vane relay displacement sensor, oil receiver blade angle indicator and speed sensor are intact and securely installed, and the governor guide vane and blade opening display are consistent with the actual ones.

[0031] Optionally, the step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes:

[0032] Starting an AVR off-line reference voltage step response test to operate the hydro-generator set off-line;

[0033] Applying a reference voltage step signal of a preset percentage value to the excitation regulator reference value;

[0034] Making the reference voltage step signal last for a preset time period;

[0035] resetting the reference voltage step signal;

[0036] Record the feedback data in this experiment.

[0037] Optionally, the step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes:

[0038] Starting an AVR online reference voltage step response test to connect the hydro-generator set to the grid;

[0039] Controlling the hydro-generator set to operate with load;

[0040] Set the excitation system test parameters to capture a pulse signal with a preset percentage change, and then turn it on and off immediately;

[0041] applying a voltage step signal to a voltage regulator reference;

[0042] Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data;

[0043] Verify the crew's response to the test and determine if the data is sufficient to validate the model;

[0044] Record the feedback data in this experiment.

[0045] Optionally, the step of operating the hydro-generator set in an automatic control mode and turning on the PSS function to perform an AVR online voltage step and pulse response test includes:

[0046] Configure the functional parameters of PSS;

[0047] Controlling the hydro-generator set to operate with load;

[0048] Applying a preset percentage of an excitation current step signal to the excitation regulator, and causing the step signal to be output continuously for a preset time period;

[0049] applying a voltage step signal to a voltage regulator reference;

[0050] Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data;

[0051] Verify the crew's response to the test and determine if the data is sufficient to validate the model;

[0052] Record the feedback data in this experiment.

[0053] Optionally, the step of operating the hydro-generator set in an automatic control mode and turning on a PSS function to perform a gain margin test includes:

[0054] Controlling the hydro-generator set to operate with load;

[0055] Exit the PSS input function and set the PSS to zero gain value;

[0056] Enable the PSS function, configure different gain values ​​for PSS, and record the corresponding data to determine the voltage oscillation situation.

[0057] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a testing device for a power system stabilizer PSS in a hydro-generator set, comprising:

[0058] A connection module, used to connect the speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing a hydro-generator set;

[0059] The preparation module is used to check each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met;

[0060] The first test module is used to operate the hydro-generator set in an automatic control mode, turn off the power system stabilizer PSS function, and perform an automatic voltage control AVR offline and online reference voltage step response test;

[0061] The second test module is used to operate the hydro-generator set in an automatic control mode and turn on the PSS function to perform an AVR online voltage step and pulse response test;

[0062] The third test module is used to operate the hydro-generator set in an automatic control mode and start the PSS function to perform a gain margin test.

[0063] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0064] The memory stores computer-executable instructions;

[0065] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0066] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0067] To achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, which implements any method in the first aspect when executed by a processor.

[0068] The test method, device, electronic equipment and storage medium of the power system stabilizer PSS in the hydro-turbine generator set provided in the present application improve the safety of the operation of the hydro-turbine generator set by testing the hydro-turbine generator set, verifying the generator model, excitation system model and PSS function.

[0069] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0071] Figure 1 A flow chart of a method for testing a power system stabilizer PSS in a hydro-generator set provided in an embodiment of the present application;

[0072] Figure 2 A schematic diagram of the structure of a testing device for a power system stabilizer PSS in a hydro-generator set provided in an embodiment of the present application;

[0073] Figure 3 A schematic diagram of a step signal provided in an embodiment of the present application;

[0074] Figure 4 A PSS gain schematic diagram provided in an embodiment of the present application;

[0075] Figure 5 A schematic diagram of the structure of a testing device for a power system stabilizer PSS in a hydro-generator set provided in an embodiment of the present application. DETAILED DESCRIPTION

[0076] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0077] In view of the problems in the related art, the embodiment of the present application provides a testing method for a power system stabilizer PSS in a hydro-generator set. Figure 1 The present invention provides a flow chart of a method for testing a power system stabilizer PSS in a hydro-generator set. Figure 1 As shown, the method comprises the following steps:

[0078] Step 101, connecting a speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing a hydro-turbine generator set;

[0079] Step 102, inspecting each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met;

[0080] Step 103, operating the hydro-generator set in an automatic control mode, turning off the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test;

[0081] Step 104, operating the hydro-generator set in an automatic control mode and turning on the PSS function to perform an AVR online voltage step and pulse response test;

[0082] Step 105, operating the hydro-generator set in an automatic control mode and turning on the PSS function to perform a gain margin test.

[0083] Optionally, the speed regulator comprehensive tester is connected to multiple signal generating devices, including:

[0084] Connecting the speed regulator comprehensive tester to a power sensor device, wherein the power sensor device is used to generate a feedback signal according to the power of the power transmitter;

[0085] The speed governor comprehensive tester is connected to a guide vane opening signal generating device, wherein the guide vane opening signal generating device is used to generate a feedback signal according to the guide vane displacement;

[0086] The speed governor comprehensive tester is connected to a blade opening signal generating device, wherein the blade opening signal generating device is used to generate a feedback signal according to the blade displacement;

[0087] The speed regulator comprehensive tester is connected to a motor frequency detection device, and the motor frequency detection device is used to generate a feedback signal according to the original machine frequency voltage transformer signal of the speed regulator electrical cabinet or the frequency of the relay protection instrument.

[0088] Figure 2 A schematic diagram of the structure of a test device for a power system stabilizer PSS in a hydro-generator set provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the required experimental instruments include: (1) Power plant instruments: relay protection tester Only, speed regulator comprehensive tester GTS-TG-A.

[0089] (2) EDC and GE instruments: WaveBook / 516E, Sentran current sensor (CT), Ohiosemitronics DC voltage sensor, Fluke i310s AC / DC current probe, AEMC MR 520AC / DC current probe.

[0090] The power plant speed governor comprehensive tester is connected to three analog signals (power signal, guide vane opening, blade opening) and one frequency signal (relay protection instrument frequency or actual machine frequency PT). The types and wiring methods of each signal are shown in Table 1:

[0091]

[0092]

[0093] Table 1

[0094] During the test, it is strictly forbidden to close or open the temporary circuit breakers QL1 and QL2 at the same time. The circuit breaker is fixed on the table of the test platform trolley. When operating, it should be opened first and then closed, and the operation should be quick.

[0095] The EDC and GE instrument signal access signals are shown in Table 2, and are subject to on-site consultation and confirmation by the other party's personnel.

[0096]

[0097] Table 2

[0098] Optionally, the inspection of each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met includes:

[0099] Check and set the programs and parameters of the excitation control system, speed regulator electrical cabinet, mechanical cabinet and hydraulic device control cabinet according to the normal operating parameters; the permanent slip coefficient Bp of the speed regulator electrical cabinet PCC A / B is 4%.

[0100] Check and make sure that the governor oil pressure device has built up pressure, the pressure, oil level and oil quality are normal, the display of each meter is normal, the valve is opened and closed in place according to the operation requirements, and the oil pump and air supply device are working normally;

[0101] Check and make sure that the safety valve of the pressure oil tank is working properly, the pressure oil pump is operating normally under the working pressure, there is no abnormal vibration and heating phenomenon, the switching and manual and automatic operation of the main and auxiliary oil pumps are normal, and the manual and automatic functions of the air supply device are normal;

[0102] Check and make sure the oil level display of the oil collecting device is normal, the manual and automatic operation of the oil pump is normal, and there is no abnormal vibration or heat.

[0103] Check and make sure that the mechanical and hydraulic converters of the speed governor are working properly;

[0104] Check and make sure that the weight device, segment closing device, etc. are working properly, and the solenoid valve is not stuck;

[0105] Check and make sure the locking spindle throwing and retracting functions are normal, the clearance between the shaft and the pin sleeve meets the requirements, and there is no friction or collision;

[0106] Check and make sure that there is no leakage in the pipelines, valves, joints and other parts of the speed control system, and all parts have been cleaned;

[0107] Check and make sure that the water guide vane relay displacement sensor, oil receiver blade angle indicator and speed sensor are intact and securely installed, and the governor guide vane and blade opening display are consistent with the actual ones.

[0108] Optionally, before the test begins, the test instrument parameters are collected and calibrated, including:

[0109] Test conditions:

[0110] (1) The unit’s automatic control equipment is in normal operating conditions.

[0111] (2) Automatic startup and grid-connection conditions are met.

[0112] (3) The temporary circuit breaker status is QL1 closed and QL2 open in the machine frequency input mode.

[0113] Main test contents

[0114] (1) AI signal sampling during calibration shutdown.

[0115] (2) Automatically start the unit to no-load and calibrate the AI ​​signal sampling.

[0116] (3) Synchronously connect the unit to the grid with a load of 10 MW, verify the linearity of the calibration signal, and calibrate the power signal sampling.

[0117] (4) After completion, the unit will be decoupled and run at no load.

[0118] Risk analysis and preventive measures

[0119] (1) Risk point: incorrect wiring. Preventive measures: Check whether the equipment numbers on site are consistent with the drawings, connect / disconnect wires one by one, hold the wires firmly during operation and properly insulate and wrap the wire noses to prevent abnormal events such as short circuits and malfunctions caused by cable rebound, and keep records of wiring disconnection.

[0120] (2) Risk point: asynchronous grid connection. Preventive control measures: switch the control mode of the unit output circuit breaker to local. The test personnel strictly implement the monitoring system during operation.

[0121] (3) Risk point: incorrect signal type access. Preventive measures: check the signal type provided by the equipment, including AC / DC, voltage level, and mA / V type, to avoid equipment damage and malfunction due to erroneous signal transmission.

[0122] Optionally, the step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes:

[0123] Starting an AVR off-line reference voltage step response test to operate the hydro-generator set off-line;

[0124] Applying a reference voltage step signal of a preset percentage value to the excitation regulator reference value;

[0125] Making the reference voltage step signal last for a preset time period;

[0126] resetting the reference voltage step signal;

[0127] Record the feedback data in this experiment.

[0128] In a possible embodiment, the AVR off-line reference voltage step response test process is as follows:

[0129] The unit runs stably at no-load and starts recording data.

[0130] Using the commissioning notebook, apply a +1.0% reference voltage (machine terminal voltage rating) step to the field regulator reference (machine terminal voltage rating 10.5 kV).

[0131] Keep the reference signal (step signal) for 10 seconds.

[0132] Reset reference step (step signal).

[0133] Record 20 seconds of data.

[0134] Using the debugging notebook, apply a step signal of 3% and 5% of the rated voltage to the excitation regulator reference value and repeat the above steps. The step size and hold time are shown in Table 3.

[0135]

[0136] Table 3

[0137] Figure 3 A schematic diagram of a step signal provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, T hold is the step signal holding time, T tot is the total test time and A is the step size.

[0138] Risk point: Incorrect setting of test values. Preventive control measures: Test operators strictly implement the monitoring system and clarify the test values ​​of on-site equipment. Abnormal fluctuation of terminal voltage. Preventive control measures: Operation operators strictly implement the monitoring system. If the terminal voltage fluctuation of the test unit is found to be abnormal ≥±1kV, manual intervention and demagnetization switch shall be immediately performed.

[0139] Optionally, the step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes:

[0140] Starting an AVR online reference voltage step response test to connect the hydro-generator set to the grid;

[0141] Controlling the hydro-generator set to operate with load;

[0142] Set the excitation system test parameters to capture a pulse signal with a preset percentage change, and then turn it on and off immediately;

[0143] applying a voltage step signal to a voltage regulator reference;

[0144] Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data;

[0145] Verify the crew's response to the test and determine if the data is sufficient to validate the model;

[0146] Record the feedback data in this experiment.

[0147] In a possible embodiment, the AVR online reference voltage step response test process is as follows:

[0148] The unit operates with a load of 45MW.

[0149] Switch the PSS function handle on the unit excitation disk cabinet to the "PSS Exit" position and check that the PSS input signal of the host computer has been exited.

[0150] Set the excitation system test parameters to capture a 1% 10 second pulse signal, turned on and then off. (Using the debugging notebook, apply a 1% excitation current step signal to the excitation regulator and maintain the step signal for 10 seconds).

[0151] Apply a voltage step signal to the voltage regulator reference value according to the table below. The voltage step signal is shown in Table 4.

[0152]

[0153] Table 4

[0154] Observe the change of reactive peak value MVar on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step and stop the test at this operating point. Save the data.

[0155] Contact EDC and GE personnel to verify the unit's response to the test and determine if the data is sufficient to validate the model.

[0156] According to the situation, input 2%, 3% and 4% AVR reference voltage step disturbance for 10 seconds, and observe and record the data again. (According to the actual equipment, it should be input 2%, 3% and 4% AVR excitation current step disturbance and last for 10 seconds)

[0157] Input 5%, 6%, 7%, 8%, 9%, 10% reference voltage step disturbance signal, the signal duration is 0.1 seconds. Record and save the data. (According to the actual equipment, it should be 5%, 6%, 7%, 8%, 9%, 10% excitation current step disturbance and last for 10 seconds)

[0158] Risk point: V / Hz limit protection alarm. Preventive measures: Suspend the test, and the operation staff on duty will report the situation to the test commander. Discuss with EDC and GE personnel whether to continue the working condition test. Coordinate and dispatch to adjust the line voltage and output when necessary.

[0159] Risk point: incorrect setting of test values. Preventive control measures: test operators strictly implement the monitoring system. Clearly define the dead zone of test value setting of on-site equipment.

[0160] Risk point: abnormal fluctuation of machine-end voltage. Preventive control measures: operating personnel strictly implement the monitoring system. If obvious oscillation is found in the machine-end voltage of the test unit and the 230kV bus voltage, stop the test immediately, activate the PSS function, increase the machine-end voltage of all grid-connected units to the upper limit, and observe whether the oscillation stops. If necessary, transfer the load of the test unit and de-list the test unit. Check whether the important plant power load is working normally, and whether the soft start and inverter are affected by voltage and frequency fluctuations. Before performing the step disturbance test step of the excitation current with an input of ≧3%, the test operator should obtain explicit permission from the test commander to agree to the test.

[0161] Optionally, the step of operating the hydro-generator set in an automatic control mode and turning on the PSS function to perform an AVR online voltage step and pulse response test includes:

[0162] Configure the functional parameters of PSS;

[0163] Controlling the hydro-generator set to operate with load;

[0164] Applying a preset percentage of an excitation current step signal to the excitation regulator, and causing the step signal to be output continuously for a preset time period;

[0165] applying a voltage step signal to a voltage regulator reference;

[0166] Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data;

[0167] Verify the crew's response to the test and determine if the data is sufficient to validate the model;

[0168] Record the feedback data in this experiment.

[0169] In a possible embodiment, the AVR online voltage step and pulse response test process is as follows:

[0170] The unit operates with a load of 45MW.

[0171] Switch the PSS function handle on the unit's excitation disk cabinet to the "PSS on" position and check that the parameter settings are correct.

[0172] Set the excitation system test parameters to capture a 10-second pulse signal with a 1% change (turn on and then off). (Using the debugging notebook, apply a 1% excitation current step signal to the excitation regulator and maintain the step signal for 10 seconds)

[0173] Apply a voltage step signal to the voltage regulator reference value according to Table 5.

[0174]

[0175] Table 5

[0176] Observe the change of reactive peak value MVar on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step and stop the test at this operating point. Save the data.

[0177] Contact EDC and GE personnel to verify the unit's response to the test and determine if the data is sufficient to validate the model.

[0178] According to the situation, input 2%, 3% and 4% AVR reference voltage step disturbance for 10 seconds, and observe and record the data again. (According to the actual equipment, it should be input 2%, 3% and 4% AVR excitation current step disturbance and last for 10 seconds)

[0179] Input 5%, 6%, 7%, 8%, 9%, 10% reference voltage disturbance signal, the signal duration is 0.1 seconds. Record and save the data. (According to the actual equipment, it should be 5%, 6%, 7%, 8%, 9%, 10% excitation current step disturbance and last for 10 seconds)

[0180] Risk point: V / Hz limit protection alarm. Preventive measures: Suspend the test, and the operation staff on duty will report the situation to the test commander. Discuss with EDC and GE personnel whether to continue the working condition test. If necessary, coordinate and dispatch to adjust the line voltage and output.

[0181] Risk point: incorrect setting of test values. Preventive measures: operating personnel strictly implement the monitoring system. Test operators and excitation professionals communicate in advance to clarify the dead zone of setting the test values ​​of on-site equipment.

[0182] Risk point: abnormal fluctuation of machine-end voltage. Preventive control measures: operating personnel strictly implement the monitoring system. When it is found that the machine-end voltage of the test unit and the 230kV bus voltage show obvious oscillation and the trend is getting bigger and bigger, stop the test immediately, increase the machine-end voltage of all grid-connected units to the upper limit, and observe whether the oscillation stops. If necessary, transfer the load of the test unit and de-list the test unit. Check whether the important plant power load is working normally, and whether the soft start and inverter are affected by voltage and frequency fluctuations. Before performing the step disturbance test step of the excitation current with an input of ≧3%, the test operator should obtain the explicit permission of the test commander to agree to the test.

[0183] Optionally, the step of operating the hydro-generator set in an automatic control mode and turning on a PSS function to perform a gain margin test includes:

[0184] Controlling the hydro-generator set to operate with load;

[0185] Exit the PSS input function and set the PSS to zero gain value;

[0186] Enable the PSS function, configure different gain values ​​for PSS, and record the corresponding data to determine the voltage oscillation situation.

[0187] In a possible embodiment, the gain margin test process is as follows:

[0188] (1) The unit operates with a load of 45MW.

[0189] (2) Backup excitation system controller parameters.

[0190] (3) Exit the PSS activation function, set the PSS to zero gain, activate the PSS function, and start recording data for 30 seconds.

[0191] (4) Set the PSS to the nominal value (normal operating value) and start recording data for 60 seconds.

[0192] (5) Set the PSS gain to 2, 3, and 4 times the nominal value (normal operating value) respectively, and repeat the previous step. When the PSS gain value is adjusted to 2 times the nominal value (normal operating value), observe the unit and system voltage operation to determine whether to continue the subsequent test.

[0193] (6) Set the PSS to zero gain and start recording data for 30 seconds. The PSS gain is shown in Table 6.

[0194]

[0195] Table 6

[0196] Figure 4 A PSS gain schematic diagram provided in an embodiment of the present application is shown in FIG. Figure 4 As shown in FIG. 1 , during the gain margin test, the gain of the PSS is increased stepwise, and each gain duration is T.

[0197] Risk point: V / Hz limit protection alarm. Preventive measures: Suspend the test, and the operation staff on duty will report the situation to the test commander. Discuss with EDC and GE personnel whether to continue the working condition test. Coordinate and adjust the line voltage and output if necessary.

[0198] Risk point: incorrect setting of test values. Preventive control measures: test operators strictly implement the monitoring system. Clearly define the dead zone of test value setting of on-site equipment.

[0199] Risk point: abnormal fluctuation of machine-end voltage. Preventive control measures: operating personnel strictly implement the monitoring system. When it is found that the machine-end voltage of the test unit and the 230kV bus voltage show obvious oscillation and the trend is getting bigger and bigger, stop the test immediately, exit the PSS function of the test unit, increase the machine-end voltage of all grid-connected units to the upper limit, and observe whether the oscillation is weakened. If necessary, transfer the load of the test unit and de-list the test unit. Check whether the important plant power load is working normally, and whether the soft start and inverter are affected by voltage and frequency fluctuations. Before taking the step of adjusting the PSS gain ≧2×KN nominal value (normal operating value), the test operator should obtain the explicit permission of the test commander to agree to the test.

[0200] In order to implement the above-mentioned embodiment, the present application also proposes a testing device for a power system stabilizer PSS in a hydro-generator set. Figure 5 The present invention provides a schematic diagram of the structure of a test device for a power system stabilizer PSS in a hydro-generator set. Figure 5 As shown, the device comprises:

[0201] A connection module 510, used to connect the speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing a hydro-generator set;

[0202] Preparation module 520, used to check each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met;

[0203] The first test module 530 is used to operate the hydro-generator set in an automatic control mode, turn off the power system stabilizer PSS function, and perform an automatic voltage control AVR offline and online reference voltage step response test;

[0204] The second test module 540 is used to operate the hydro-generator set in an automatic control mode and turn on the PSS function to perform an AVR online voltage step and pulse response test;

[0205] The third test module 550 is used to operate the hydro-generator set in an automatic control mode and start the PSS function to perform a gain margin test.

[0206] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0207] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0208] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0209] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0210] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0211] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0212] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0213] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0214] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0215] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0216] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0217] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0218] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0219] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for testing a power system stabilizer PSS in a hydro-generator set, characterized in that: The following steps are involved: Connecting the speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing the hydro-generator set; Check each device and subsystem in the hydro-generator set to ensure that the experimental conditions are met; The hydro-generator set is operated in an automatic control mode, the power system stabilizer PSS function is turned off, and an automatic voltage control AVR offline and online reference voltage step response test is performed; The hydro-generator set is operated in an automatic control mode and the PSS function is turned on to perform an AVR online voltage step and pulse response test; The hydro-generator set is operated in an automatic control mode and the PSS function is turned on to perform a gain margin test.

2. The method according to claim 1, characterized in that: The speed regulator comprehensive tester is connected to multiple signal generating devices, including: Connecting the speed regulator comprehensive tester to a power sensor device, wherein the power sensor device is used to generate a feedback signal according to the power of the power transmitter; The speed governor comprehensive tester is connected to a guide vane opening signal generating device, wherein the guide vane opening signal generating device is used to generate a feedback signal according to the guide vane displacement; The speed governor comprehensive tester is connected to a blade opening signal generating device, wherein the blade opening signal generating device is used to generate a feedback signal according to the blade displacement; The speed regulator comprehensive tester is connected to a motor frequency detection device, and the motor frequency detection device is used to generate a feedback signal according to the original machine frequency voltage transformer signal of the speed regulator electrical cabinet or the frequency of the relay protection instrument.

3. The method according to claim 1, characterized in that The inspection of each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met includes: Check and set the programs and parameters of the excitation control system, speed regulator electrical cabinet, mechanical cabinet and hydraulic device control cabinet according to the normal operating parameters; Check and make sure that the governor oil pressure device has built up pressure, the pressure, oil level and oil quality are normal, the display of each meter is normal, the valve is opened and closed in place according to the operation requirements, and the oil pump and air supply device are working normally; Check and make sure that the safety valve of the pressure oil tank is working properly, the pressure oil pump is operating normally under the working pressure, there is no abnormal vibration and heating phenomenon, the main and auxiliary oil pumps are switching and operating manually and automatically normally, and the manual and automatic functions of the air supply device are normal; Check and make sure that the oil level display of the oil collecting device is normal, the manual and automatic operation of the oil pump is normal, and there is no abnormal vibration or heating; Check and make sure that the mechanical and hydraulic converters of the speed governor are working properly; Check and make sure that the weight device, segment closing device, etc. are working properly, and the solenoid valve is not stuck; Check and make sure the locking spindle throwing and retracting functions are normal, the clearance between the shaft and the pin sleeve meets the requirements, and there is no friction or collision; Check and make sure that there is no leakage in the pipelines, valves, joints and other parts of the speed control system, and all parts have been cleaned; Check and make sure that the water guide vane relay displacement sensor, oil receiver blade angle indicator and speed sensor are intact and securely installed, and the governor guide vane and blade opening display are consistent with the actual ones.

4. The method according to claim 1, characterized in that: The step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes: Starting an AVR off-line reference voltage step response test to operate the hydro-generator set off-line; Applying a reference voltage step signal of a preset percentage value to the excitation regulator reference value; Making the reference voltage step signal last for a preset time period; resetting the reference voltage step signal; Record the feedback data in this experiment.

5. The method according to claim 1, characterized in that The step of operating the hydro-generator set in an automatic control mode, shutting down the power system stabilizer PSS function, and performing an automatic voltage control AVR offline and online reference voltage step response test includes: Starting an AVR online reference voltage step response test to connect the hydro-generator set to the grid; Controlling the hydro-generator set to operate with load; Set the excitation system test parameters to capture a pulse signal with a preset percentage change, and then turn it on and off immediately; applying a voltage step signal to a voltage regulator reference; Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data; Verify the crew's response to the test and determine if the data is sufficient to validate the model; Record the feedback data in this experiment.

6. The method according to claim 1, characterized in that The step of operating the hydro-generator set in an automatic control mode and turning on the PSS function to perform an AVR online voltage step and pulse response test includes: Configure the functional parameters of PSS; Controlling the hydro-generator set to operate with load; Applying a preset percentage of an excitation current step signal to the excitation regulator, and causing the step signal to be output continuously for a preset time period; applying a voltage step signal to a voltage regulator reference; Observe the changes in reactive peak value on the touch screen of the excitation system control cabinet. When the reactive value is observed to be restored to the value before the test, cancel the step, stop the test at this operating point and save the data; Verify the crew's response to the test and determine if the data is sufficient to validate the model; Record the feedback data in this experiment.

7. The method according to claim 1, characterized in that The step of operating the hydro-generator set in an automatic control mode and starting the PSS function to perform a gain margin test includes: Controlling the hydro-generator set to operate with load; Exit the PSS input function and set the PSS to zero gain value; Enable the PSS function, configure different gain values ​​for PSS, and record the corresponding data to determine the voltage oscillation situation.

8. A test device for a power system stabilizer PSS in a hydro-generator set, characterized in that: include: A connection module, used to connect the speed governor comprehensive tester to a plurality of signal generating devices, wherein the signal generating devices are used for testing a hydro-generator set; The preparation module is used to check each device and subsystem in the hydro-generator set to determine whether the experimental conditions are met; The first test module is used to operate the hydro-generator set in an automatic control mode, turn off the power system stabilizer PSS function, and perform an automatic voltage control AVR offline and online reference voltage step response test; The second test module is used to operate the hydro-generator set in an automatic control mode and turn on the PSS function to perform an AVR online voltage step and pulse response test; The third test module is used to operate the hydro-generator set in an automatic control mode and start the PSS function to perform a gain margin test.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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