Pss parameter optimization method and device for CPR1000 nuclear power unit

Abstract

The present application relates to a PSS parameter optimization method and device for a CPR1000 nuclear power unit, comprising: S1, establishing a PSS parameter adjustment model corresponding to an excitation system in the CPR1000 nuclear power unit, and establishing a waveform playback device according to the PSS parameter adjustment model, wherein the PSS parameter adjustment model is used to adjust the PSS parameter, and the waveform playback device is used to receive the PSS parameter and generate a corresponding waveform; S2, monitoring the working waveform of the excitation system to obtain measured oscillation waveform data when the excitation system oscillates; S3, inputting the measured oscillation waveform data to the waveform playback device, and adjusting the corresponding PSS parameter according to a preset rule through the PSS parameter adjustment model, so as to obtain a plurality of first waveforms corresponding to the waveform playback device; S4, obtaining the corresponding PSS parameter corresponding to the shaft torsional vibration suppression of the excitation system as the target PSS parameter according to the plurality of first waveforms. The present application can quickly obtain the PSS optimization parameter, and effectively reduce the response of the excitation regulator to the shaft torsional vibration.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and more specifically, to a method and apparatus for optimizing PSS parameters for CPR1000 nuclear power units. Background Technology

[0002] The CPR1000 nuclear power technology is derived from the megawatt-class reactor type introduced from France. In actual operation, it is easy to induce shaft torsional vibration of the unit when there is a serious external fault in the power grid. The shaft torsional vibration signal will cause the excitation voltage to oscillate for a short time of about 6-8Hz, and the active power will also oscillate more violently, resulting in shaft torsional vibration of the unit, which seriously threatens the safe and stable operation of the nuclear power unit.

[0003] To address shaft torsional vibration, a common engineering practice is to install shaft torsional vibration protection devices. These devices continuously monitor and analyze the turbine shaft speed, taking into account speed characteristics, combined with assessments of terminal electrical quantities and fatigue wear. If these parameters reach set values, or if subsynchronous torsional vibration at a characteristic frequency is triggered in the shaft, and the amplitude gradually diverges, potentially threatening unit safety, the system will trip, issue alarms, and initiate coordinated tripping, providing a coordinated unit shutdown function. However, research and application of active shaft torsional vibration suppression in the field are limited, and the cost of installing shaft torsional vibration protection devices is also very high.

[0004] Traditional generator excitation systems can respond to oscillations in excitation voltage and active power to some extent, but due to the large time constant of the generator excitation winding, they are practically ineffective in affecting unit power and damping, and thus cannot effectively solve the shaft torsional vibration problem. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and apparatus for optimizing PSS parameters of CPR1000 nuclear power units.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a PSS parameter optimization method for CPR1000 nuclear power units, including the following steps:

[0007] S1. Establish a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, and establish a waveform playback device based on the PSS parameter adjustment model. The PSS parameter adjustment model is used to adjust the PSS parameters, and the waveform playback device is used to receive the PSS parameters and generate the corresponding waveform.

[0008] S2. Monitor the operating waveform of the excitation system to obtain the measured oscillation waveform data when the excitation system oscillates;

[0009] S3. Input the measured oscillation waveform data to the waveform playback device, and adjust the corresponding PSS parameters according to the preset rules through the PSS parameter adjustment model, so as to obtain a number of corresponding first waveforms through the waveform playback device.

[0010] S4. The PSS parameters corresponding to the shaft torsional vibration suppression of the excitation system that meet the preset conditions are obtained from the several first waveforms and are taken as the target PSS parameters.

[0011] Preferably, the PSS parameter optimization method for CPR1000 nuclear power units in this application further includes:

[0012] The same preset waveform data is input to the waveform playback device multiple times, and the output of the waveform playback device is monitored when the PSS parameter of the PSS parameter adjustment model is fixed to obtain several second waveforms.

[0013] Obtain the maximum deviation between the plurality of second waveforms and the preset waveform data, and execute step S3 when the maximum deviation is less than or equal to the preset value.

[0014] Preferably, the PSS parameter optimization method for CPR1000 nuclear power units in this application further includes optimizing the waveform playback device when the maximum deviation is greater than the preset value.

[0015] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, the preset value is less than or equal to 5%.

[0016] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, the "multiple times" includes at least three times.

[0017] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, the preset waveform data is the measured oscillation waveform data.

[0018] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, in step S3, adjusting the PSS parameter adjustment model according to a preset rule includes:

[0019] Obtain the PSS parameter category and its corresponding adjustment range corresponding to the PSS parameter adjustment model;

[0020] The PSS parameter categories are exhaustively adjusted according to a preset step size using a preset calculation model.

[0021] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, the PSS parameter category includes some or all of the general parameters of the following PSS transfer functions:

[0022] Angular velocity input to the time constant TW1 of the first-order DC blocking element.

[0023] The angular velocity is input to the time constant TW2 of the second-order DC blocking element.

[0024] The time constant of the first-order DC blocking circuit at the power input is TW3.

[0025] PSS proportional gain Ks1,

[0026] PSS power channel DC blocking element gain Ks2

[0027] PSS power channel proportional gain Ks3

[0028] The time constant of the lead-lag phase compensation element is 1T1.

[0029] The time constant of the lead-lag phase compensation element is 2T2.

[0030] The time constant of the two-stage lead-lag phase compensation element is 3T3.

[0031] The time constant of the two-stage lead-lag phase compensation element is 4T4.

[0032] The time constant T7 of the high-pass filter stage in the power input stage.

[0033] The time constant of the high-pass filter stage is 1T8.

[0034] The time constant of the high-pass filter stage is 2T9.

[0035] The three time constants of the lead-lag phase compensation stage are 11T11.

[0036] The time constant of the lead-lag phase compensation stage is 21T21.

[0037] The time constant of the four-stage lead-lag phase compensation element is 31T31.

[0038] The time constant of the lead-lag phase compensation stage is 41T41.

[0039] Limiting element constant 1M and limiting element constant 2N.

[0040] Preferably, in the PSS parameter optimization method for CPR1000 nuclear power units of this application, in step S4, the step of obtaining the shaft torsional vibration suppression corresponding to the excitation system based on the plurality of first waveforms to meet the preset conditions includes:

[0041] The oscillation time of the excitation system is shortened by more than or equal to 0.3 seconds, and the oscillation amplitude of the excitation system is reduced by more than or equal to 40%.

[0042] This application also constructs a PSS parameter optimization device for CPR1000 nuclear power units, including:

[0043] The PSS parameter adjustment model establishment unit is used to establish a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, wherein the PSS parameter adjustment model is used to adjust the PSS parameters.

[0044] A waveform playback device establishment unit is used to establish a waveform playback device based on the PSS parameter adjustment model. The waveform playback device is used to receive the PSS parameters and generate the corresponding waveform.

[0045] An oscillation waveform acquisition unit is used to monitor the working waveform of the excitation system in order to obtain the measured oscillation waveform data when the excitation system oscillates.

[0046] The waveform adjustment unit is used to input the measured oscillation waveform data to the waveform playback device, and adjust its corresponding PSS parameters according to the preset rules through the PSS parameter adjustment model, so as to obtain a number of corresponding first waveforms through the waveform playback device.

[0047] The confirmation unit is used to obtain the target PSS parameter based on the PSS parameter obtained from the first waveforms, which is the PSS parameter corresponding to the shaft torsional vibration suppression of the excitation system that meets the preset conditions.

[0048] The method and apparatus for optimizing PSS parameters for CPR1000 nuclear power units according to the present invention have the following beneficial effects: by rapidly obtaining optimized PSS parameters, the response of the excitation regulator to shaft torsional vibration can be effectively reduced, especially when a serious fault occurs in the external power grid, the excitation voltage oscillation is significantly reduced, which can improve the stability of the power grid system. Attached Figure Description

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0050] Figure 1 This is a flowchart of an embodiment of the PSS parameter optimization method for CPR1000 nuclear power units according to the present invention;

[0051] Figure 2 This is a flowchart of another embodiment of the PSS parameter optimization method for CPR1000 nuclear power units of the present invention;

[0052] Figure 3This is a logic block diagram of the general PSS function in the PSS parameter optimization method for CPR1000 nuclear power units of the present invention;

[0053] Figure 4 This is a logic block diagram of the first embodiment of the PSS parameter optimization device for CPR1000 nuclear power units of the present invention;

[0054] Figures 5 to 7 This is a comparative diagram of the three-phase voltages of the waveform playback device;

[0055] Figures 8 to 10 This is a comparative schematic diagram of the three-phase current of the waveform playback device;

[0056] Figure 11 It is a schematic diagram of measured oscillation waveform data;

[0057] Figure 12 for Figure 11 A schematic diagram comparing voltage signals before and after data optimization;

[0058] Figure 13 for Figure 11 A schematic diagram comparing the current signals before and after data optimization;

[0059] Figure 14 for Figure 11 A diagram showing the comparison of useful power before and after data optimization;

[0060] Figure 15 for Figure 11 A schematic diagram comparing the output of the excitation system before and after data optimization. Detailed Implementation

[0061] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0062] like Figure 1 As shown, in the first embodiment of the PSS parameter optimization method for CPR1000 nuclear power units of the present invention, the following steps are included: S1, establishing a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, and establishing a waveform playback device according to the PSS parameter adjustment model, wherein the PSS parameter adjustment model is used to adjust the PSS parameters, and the waveform playback device is used to receive the PSS parameters and generate the corresponding waveform; specifically, establishing a generator, i.e., excitation regulator simulation model, that matches the actual CPR1000 nuclear power unit, the simulation model includes a PSS parameter adjustment model and a waveform playback device, through which the response of the excitation regulator to oscillations can be reproduced.

[0063] S2. Monitor the operating waveform of the excitation system to obtain the measured oscillation waveform data when the excitation system oscillates; specifically, during the operation of the CPR1000 nuclear power unit, monitor the operating waveform of the excitation system in real time to obtain the measured oscillation waveform data when the CPR1000 nuclear power unit oscillates.

[0064] S3. Input the measured oscillation waveform data to the waveform playback device, and adjust the corresponding PSS parameters according to preset rules using the PSS parameter adjustment model, so as to obtain several corresponding first waveforms through the waveform playback device; specifically, the measured oscillation waveform is played back through the waveform playback device, and the corresponding PSS parameters are adjusted using the PSS parameter adjustment model. Adjusting the PSS parameters can change the output waveform of the waveform playback device. Each time the PSS parameters are adjusted, a first waveform obtained through the waveform playback device is recorded, and the changes in the first waveform are observed.

[0065] S4. Based on the aforementioned first waveforms, the PSS parameters corresponding to the shaft torsional vibration suppression of the excitation system that meet the preset conditions are obtained as target PSS parameters. Specifically, based on the obtained first waveforms, the PSS parameters corresponding to the waveforms that meet the operating requirements of the excitation system are obtained as the target PSS parameters. Adjusting the excitation system of the CPR1000 nuclear power unit according to these target control parameters can enable the CPR1000 nuclear power unit to operate in its optimal state. It can be understood that the process of obtaining the first waveforms essentially ensures that the shaft torsional vibration suppression of the excitation system meets the requirements of the normal operating range of the excitation system.

[0066] Optionally, in step S4, determining that the shaft torsional vibration suppression corresponding to the excitation system meets the preset conditions based on the plurality of first waveforms includes: the oscillation time of the excitation system is shortened by a duration greater than or equal to 0.3 seconds, and the oscillation amplitude of the excitation system is reduced by a degree greater than or equal to 40%. Specifically, the determination that the shaft torsional vibration suppression corresponding to the excitation system meets the preset conditions can be based on the reduction in the obtained oscillation time and amplitude of the excitation system, while the excitation voltage does not exhibit more than 10 stable oscillations.

[0067] Optional, such as Figure 2As shown, the PSS parameter optimization method for CPR1000 nuclear power units in this application further includes: S21, inputting the same preset waveform data multiple times to the waveform playback device, and monitoring the output of the waveform playback device to obtain several second waveforms when the PSS parameters of the PSS parameter adjustment model are fixed; S22, obtaining the maximum deviation between the several second waveforms and the preset waveform data, and executing step S3 when the maximum deviation is less than or equal to a preset value. Specifically, when establishing the waveform playback device, the obtained waveform playback device is verified to ensure stable operation. A preset waveform data is input multiple times to the waveform playback device. At this time, the output waveform of the waveform playback device, i.e., the second waveform, is monitored while the PSS parameters remain unchanged, and the maximum deviation between the second waveform and the preset waveform data is obtained. When the waveform playback device is stable, the corresponding obtained second waveform will not show a significant change compared to the input waveform, and the deviation between the input and output is less than a preset value. Only when the constructed PSS parameter adjustment model and waveform playback device are considered stable is the analysis process of the measured oscillation waveform data, i.e., step S3 and subsequent steps, performed. Figures 3 to 8 Therefore, by verifying the discrepancies between the original actual data and the replay data, the correctness of the model was confirmed. Figures 5 to 7 The results show the comparison between the three-phase voltages. Figures 8 to 10 This is a comparison result between the three-phase currents. In one embodiment, the obtained measured oscillation waveform data can be directly used as preset waveform data, and the stable system can be obtained when this data remains unchanged. After obtaining the stable system, the measured oscillation waveform data is then used as a basis for optimization.

[0068] Optionally, based on the above, the PSS parameter optimization method for CPR1000 nuclear power units in this application further includes: when the deviation between the second waveforms output by the waveform playback device exceeds a preset value, the waveform playback device needs to be optimized. This optimization process can optimize the model parameters of the PSS parameter adjustment model in the playback device until the PSS parameter adjustment model obtained based on the model parameters is stable. In some cases, it is also necessary to confirm the hardware structure of the waveform playback device. For example, hardware adjustments are made to the power amplifier, excitation control cabinet, and waveform recorder in the waveform playback device. The power amplifier amplifies the measured waveforms, such as the three-phase voltage and current, and transmits the amplified signals to the excitation control cabinet. The excitation control cabinet then transmits the internal signals of the actual excitation regulator to the waveform recorder through the PSS parameter adjustment model.

[0069] In one embodiment, the maximum deviation of the second waveform is set to be less than or equal to 5%. That is, the preset value can be less than or equal to 5%, so that the deviation between the second waveforms is controlled within a small range.

[0070] In one embodiment, the preset number of waveform data inputs can be three or more consecutive times. Generally, three data inputs are sufficient to verify the stability of the constructed waveform playback device.

[0071] Optionally, in step S3, adjusting the PSS parameter adjustment model according to preset rules includes: obtaining the PSS parameter categories corresponding to the PSS parameter adjustment model and their corresponding adjustment ranges; and exhaustively adjusting each PSS parameter category according to a preset step size using a preset calculation model. Specifically, the PSS parameter adjustment model is based on the type of PSS parameter and its corresponding adjustment range. It can be understood that the PSS parameter adjustment model corresponds to multiple adjustable PSS parameters, each with different adjustment ranges and different response degrees. A reasonable step size is set based on the response degree. For example, for PSS parameters with large responses, the adjustment step size can be smaller; for PSS parameters with small responses, the adjustment step size can be larger. Based on the range and step size of the PSS parameters, a traversal model, i.e., the preset calculation model, is constructed to exhaustively adjust each PSS parameter, obtaining the optimal combination of PSS parameters. This traversal model can be based on commonly used computer models or data models.

[0072] Optionally, the PSS parameter categories include some or all of the following general parameters of the PSS transfer function: angular velocity input first-order DC blocking link time constant TW1, angular velocity input second-order DC blocking link time constant TW2, power input first-order DC blocking link time constant TW3, PSS proportional gain Ks1, PSS power channel DC blocking link gain Ks2, PSS power channel proportional gain Ks3, lead-lag phase compensation link time constant 1T1, lead-lag phase compensation link time constant 2T2, lead-lag phase... The time constants for the second phase compensation stage are 3T3, 4T4, T7, 1T8, and 2T9; the time constants for the third phase compensation stage are 11T11, 21T21, 31T31, and 41T41; the time constants for the fourth phase compensation stage are 1M and 2N. Specifically, based on... Figure 3 The PSS transfer function model shown uses the PSS parameters corresponding to each stage as adjustment parameters. In some embodiments, PSS parameters corresponding to stages that are clearly unrelated are removed to reduce the workload of traversal. However, usually, considering complex application environments, all PSS parameters can be obtained for deviation adjustment.

[0073] like Figure 4 As shown, a PSS parameter optimization device for a CPR1000 nuclear power unit according to this application includes:

[0074] The PSS parameter adjustment model establishment unit 110 is used to establish a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, wherein the PSS parameter adjustment model is used to adjust the PSS parameters.

[0075] The waveform playback device establishment unit 120 is used to establish a waveform playback device according to the PSS parameter adjustment model. The waveform playback device is used to receive the PSS parameters and generate the corresponding waveform.

[0076] The oscillation waveform acquisition unit 130 is used to monitor the working waveform of the excitation system in order to obtain the measured oscillation waveform data when the excitation system oscillates.

[0077] The waveform adjustment unit 140 is used to input the measured oscillation waveform data to the waveform playback device, and adjust its corresponding PSS parameters according to the preset rules through the PSS parameter adjustment model, so as to obtain a number of corresponding first waveforms through the waveform playback device.

[0078] The confirmation unit 150 is used to obtain the target PSS parameter based on the PSS parameter that satisfies the preset condition for shaft torsional vibration suppression of the excitation system according to the plurality of first waveforms.

[0079] Specifically, the specific coordination and operation process between the various units of the PSS parameter optimization device for CPR1000 nuclear power units can be referred to the above-mentioned PSS parameter optimization method for CPR1000 nuclear power units, and will not be repeated here.

[0080] In one specific embodiment, Figure 11 As shown, an oscillation response of approximately 6Hz occurring in a CPR1000 nuclear power unit was replayed using a waveform playback device. This oscillation was a 6Hz high-frequency shaft oscillation triggered by a real-world grid disturbance. The voltage and current corresponding to this oscillation were input to the waveform playback device. The device simulated the operation of the excitation regulator using a PSS parameter adjustment model, modifying different PSS parameters to find the optimal parameters and verifying their effectiveness in improving the 6Hz torsional vibration. Table 1 shows a comparison of the PSS parameters before and after optimization.

[0081] Table 1: Comparison of PSS parameters before and after optimization

[0082] Parameter name After optimization Before optimization Angular velocity input first-order DC blocking element time constant TW1 8.00 5.00 Angular velocity input, second-order DC blocking element time constant TW2 8.00 5.00 The time constant of the first-order DC blocking element in the power input is TW3. 8.00 5.00 PSS proportional gain Ks1 5.00 5.00 PSS power channel DC blocking element gain Ks2 0.82 0.51 PSS power channel proportional gain Ks3 1.00 1.00 The time constant 1T1 of the lead-lag phase compensation element 0.50 0.24 The time constant of the lead-lag phase compensation element is 2T2. 0.05 0.02 The time constant of the two-stage lead-lag phase compensation stage is 3T3. 0.40 0.25 The time constant of the two-stage lead-lag phase compensation stage is 4T4. 0.04 0.02 The time constant T7 of the power input stage and the high-pass filter stage 8.0 5.0 The time constant of the high-pass filter stage is 1T8. 0.6 0.6 The time constant of the high-pass filter stage is 2T9. 0.12 0.12 The three time constants of the lead-lag phase compensation stage are 11T11 0.3 0.2 The three time constants of the lead-lag phase compensation stage are 21T21 0.03 0.03 The time constant of the four-stage lead-lag phase compensation stage is 31T31. 0.01 0.10 The time constant of the lead-lag phase compensation stage is 41T41. 0.1 0.1 Limiting element constant 1M 5 5 Limiting element constant 2N 1 1

[0083] The optimized PSS parameters are then input into the actual unit, and the corresponding system before and after optimization is compared, such as... Figures 11 to 14 As shown in the figure, when the voltage and current signals with shaft torsional vibration waveforms are played back, the excitation voltage of the original PSS parameters has obvious high-frequency components, indicating that the original parameters have a significant response to the shaft torsional vibration waveform. However, the excitation voltage fluctuation of the new PSS parameters is greatly reduced, indicating that the new PSS parameters have a significantly reduced response to shaft torsional vibration. Figure 12 This is a schematic diagram comparing the voltage signals before and after optimization. Figure 13 This is a schematic diagram comparing the current signals before and after optimization. Figure 14 This is a diagram showing the comparison of useful power before and after optimization. Figure 15 A schematic diagram showing the output comparison of the excitation regulator of the excitation system before and after optimization.

[0084] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for optimizing PSS parameters in CPR1000 nuclear power units, characterized in that, Includes the following steps: S1. Establish a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, and establish a waveform playback device based on the PSS parameter adjustment model. The PSS parameter adjustment model is used to adjust the PSS parameters, and the waveform playback device is used to receive the PSS parameters and generate the corresponding waveform. S2. Monitor the operating waveform of the excitation system to obtain the measured oscillation waveform data when the excitation system oscillates; S3. Input the measured oscillation waveform data to the waveform playback device, and adjust its corresponding PSS parameters according to the preset rules through the PSS parameter adjustment model, so as to obtain a number of corresponding first waveforms through the waveform playback device. S4. The PSS parameters corresponding to the shaft torsional vibration suppression of the excitation system that meet the preset conditions are obtained from the several first waveforms and are taken as the target PSS parameters. In step S3, adjusting the PSS parameter adjustment model according to preset rules includes: Obtain the PSS parameter category and its corresponding adjustment range corresponding to the PSS parameter adjustment model; Based on the range and step of PSS parameters, a traversal model is constructed to exhaustively adjust each PSS parameter category according to a preset step.

2. The PSS parameter optimization method for CPR1000 nuclear power units according to claim 1, characterized in that, The method further includes: The same preset waveform data is input to the waveform playback device multiple times, and the output of the waveform playback device is monitored when the PSS parameter of the PSS parameter adjustment model is fixed to obtain several second waveforms. Obtain the maximum deviation between the plurality of second waveforms and the preset waveform data, and execute step S3 when the maximum deviation is less than or equal to the preset value.

3. The PSS parameter optimization method for CPR1000 nuclear power units according to claim 2, characterized in that, The method further includes optimizing the waveform playback device when the maximum deviation is greater than the preset value.

4. The PSS parameter optimization method for CPR1000 nuclear power units according to claim 3, characterized in that, The preset value is less than or equal to 5%.

5. The PSS parameter optimization method for CPR1000 nuclear power units according to claim 3, characterized in that, The term "multiple times" includes at least three times.

6. The method for optimizing PSS parameters for CPR1000 nuclear power units according to claim 3, characterized in that, The preset waveform data is the measured oscillation waveform data.

7. The method for optimizing PSS parameters for CPR1000 nuclear power units according to claim 1, characterized in that, The PSS parameter category includes some or all of the following general parameters of the PSS transfer function: Angular velocity input to the time constant TW1 of the first-order DC blocking element. The angular velocity is input to the time constant TW2 of the second-order DC blocking element. The time constant of the first-order DC blocking circuit at the power input is TW3. PSS proportional gain Ks1, PSS power channel DC blocking element gain Ks2 PSS power channel proportional gain Ks3 The time constant of the lead-lag phase compensation element is 1T1. The time constant of the lead-lag phase compensation element is 2T2. The time constant of the two-stage lead-lag phase compensation stage is 3T3. The time constant of the two-stage lead-lag phase compensation element is 4T4. The time constant T7 of the high-pass filter stage in the power input stage. The time constant of the high-pass filter stage is 1 T8. The time constant of the high-pass filter stage is 2T9. The three time constants of the lead-lag phase compensation stage are 11T11. The three time constants of the lead-lag phase compensation stage are 21T21. The time constant of the lead-lag phase compensation stage is 31T31. The time constant of the lead-lag phase compensation stage is 41T41. Limiting element constant 1 M and limiting element constant 2 N.

8. The method for optimizing PSS parameters for CPR1000 nuclear power units according to claim 1, characterized in that, In step S4, obtaining the shaft torsional vibration suppression corresponding to the excitation system based on the plurality of first waveforms satisfies the preset condition, including: The oscillation time of the excitation system is shortened by more than or equal to 0.3 seconds, and the oscillation amplitude of the excitation system is reduced by more than or equal to 40%.

9. A PSS parameter optimization device for CPR1000 nuclear power units, characterized in that, The apparatus for implementing the method as described in any one of claims 1 to 8 comprises: The PSS parameter adjustment model establishment unit is used to establish a PSS parameter adjustment model corresponding to the excitation system in the CPR1000 nuclear power unit, wherein the PSS parameter adjustment model is used to adjust the PSS parameters. A waveform playback device establishment unit is used to establish a waveform playback device based on the PSS parameter adjustment model. The waveform playback device is used to receive the PSS parameters and generate the corresponding waveform. An oscillation waveform acquisition unit is used to monitor the working waveform of the excitation system in order to obtain the measured oscillation waveform data when the excitation system oscillates. The waveform adjustment unit is used to input the measured oscillation waveform data to the waveform playback device, and adjust its corresponding PSS parameters according to the preset rules through the PSS parameter adjustment model, so as to obtain a number of corresponding first waveforms through the waveform playback device. The confirmation unit is used to obtain the target PSS parameter based on the PSS parameter obtained from the first waveforms, which is the PSS parameter corresponding to the shaft torsional vibration suppression of the excitation system that meets the preset conditions.

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