A synchronous generator excitation control device field simulation test method and system

Abstract

The application discloses a synchronous generator excitation control device field simulation test method and system, and establishes an equivalent controlled synchronous generator and an electromagnetic transient simulation model of an excitation loop of the equivalent controlled synchronous generator by acquiring detection related parameters of the synchronous generator controlled by the excitation control device, the test simulation device loaded with the electromagnetic transient simulation model is connected with the field excitation control device, field simulation test on grid-related control performance of the excitation control device is carried out, the digital values of the excitation voltage and the excitation current calibrated and tested according to the air gap magnetic field current value of the no-load saturation characteristic are used to obtain field simulation test results; a detection report is output according to the field simulation test results, the hardware and software design performance of the field excitation control device is comprehensively evaluated, defects and hidden dangers existing in the hardware and software design and parameter setting of the device are found in advance, the ability of the unit to resist power grid faults is improved, and the overall operation safety and stability of the power grid and the unit are improved.

Description

Technical Field

[0001] This invention relates to the field of digital dynamic simulation testing technology, specifically to a method and system for on-site simulation testing of a synchronous generator excitation control device. Background Technology

[0002] The auxiliary control loop of the excitation system is inactive during normal grid operation, but it is activated and takes over the main voltage loop control during grid faults. Improper parameter tuning in the auxiliary control loop can easily cause generator oscillations, leading to cascading grid faults. Furthermore, actual load testing of the auxiliary control loop is inherently risky, as the test conditions are difficult to achieve and prone to oscillations. During the commissioning phase of some units, tight deadlines may result in lax oversight, potentially creating safety hazards for the later operation of the generator units and the grid. Therefore, conducting on-site grid-connected performance testing and evaluation of the excitation controller for large generating units is of great significance in reducing the operational risks of both large generating units and the grid.

[0003] To ensure that the measured signals are consistent with those obtained from the field, existing closed-loop tests employ power amplifiers to convert the real-time terminal voltage and current digital signals calculated by the real-time simulator into analog signals, amplify them, and then send them to the excitation regulator device for controller-in-loop testing. For example, CN102736521A, "Closed-Loop Test System and Method for Synchronous Generator Excitation and PSS Control Device," provides "a closed-loop test system and method for a synchronous generator excitation and PSS control device. The closed-loop test system includes a real-time simulation workstation, an RTDS real-time digital simulator, analog output boards, a power amplifier, an excitation and PSS control device, digital output boards, digital input boards, and the real-time simulation workstation and RTDS real-time digital..." The simulator is connected, and the RTDS (Real-Time Digital Simulator) sends current and voltage signals to the excitation and PSS (Power Separation and Control) device through analog output boards and power amplifiers. The RTDS also sends the synchronous generator grid-connected circuit breaker closing signal to the excitation and PSS control device through digital output boards. The excitation and PSS control device, in turn, sends the pulse trigger signal of the six-pulse rectifier bridge to the RTDS through digital input boards. The invention's self-excited synchronous generator excitation and PSS control device offers flexible closed-loop testing capabilities, allowing for various types of tests. However, the invention lacks RC (Resistor-Capacitor) filtering in the thyristor stage, making it susceptible to errors and trigger misalignment due to harmonic voltage generation, thus affecting simulation accuracy. Furthermore, the excitation voltage and current are not standardized, failing to accurately reproduce the actual grid-connected control characteristics of the excitation device on the generator, potentially leading to erroneous evaluation conclusions. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method and system for on-site simulation testing of a synchronous generator excitation control device, comprising:

[0005] To obtain the relevant detection parameters of the synchronous generator controlled by the field excitation control device, an equivalent electromagnetic transient simulation model of the controlled synchronous generator and excitation circuit is established.

[0006] A closed-loop simulation test system is built. The closed-loop simulation test system is loaded with an electromagnetic transient simulation model and an excitation voltage and excitation current calibration algorithm. The digital input interface of the closed-loop simulation test system is electrically connected to the digital output interface of the thyristor trigger pulse of the field excitation control device.

[0007] The grid-connected control performance of the field excitation control device is simulated on-site, and the results of the on-site simulation test are obtained. A test report is then output based on the results of the on-site simulation test.

[0008] Preferably, the relevant detection parameters of the synchronous generator controlled by the field excitation control device include electrical parameters, no-load saturation characteristic curve, excitation transformer electrical parameters, main transformer electrical parameters, and main transformer high-voltage side system interconnection reactance.

[0009] Preferably, the electromagnetic transient model includes a synchronous generator and main transformer model, a grid-connected switch, a system equivalent reactance, a controllable voltage source model, an excitation transformer model, and an excitation circuit and starting circuit, wherein:

[0010] The main transformer model is connected to the controllable voltage source model via a grid-connected switch to serve as the load of the synchronous generator;

[0011] The excitation circuit includes a thyristor rectifier bridge, a resistor-capacitor absorption circuit, a demagnetizing switch, and an excitation load current source; the output terminal of the thyristor rectifier bridge is connected to the excitation load current source, and the input terminal is electrically connected to the synchronous generator through an excitation transformer model.

[0012] The thyristor rectifier bridge includes a six-pulse fully controlled bridge or a three-pulse semi-controlled rectifier bridge. The rectifier bridge adopts an RC absorption overvoltage circuit to suppress commutation overvoltage. The output voltage of the thyristor rectifier bridge is filtered and smoothed, and then normalized by the excitation voltage calibration algorithm to be used as the excitation voltage of the synchronous generator to participate in the simulation to obtain the excitation current. The normalized value of the excitation current is normalized and used as the load current of the output circuit of the thyristor simulation model. The excitation voltage at the next moment is obtained by circuit calculation.

[0013] The excitation circuit includes an excitation switch and an excitation power supply. The excitation circuit is connected in parallel with the output terminal of the thyristor rectifier bridge to provide the initial excitation current when the voltage is boosted from zero.

[0014] The system's equivalent reactance is used to provide a grid connection environment equivalent to that of the on-site generator.

[0015] Preferably, the calibration algorithm for excitation voltage and excitation current is as follows:

[0016] Before conducting on-site simulation tests on the grid-connected control performance of the field excitation control device, the air gap magnetic field current corresponding to the rated voltage on the no-load saturation characteristic of the synchronous generator of the field excitation control device is used as the excitation current per-unit base value, and the product of the rated air gap magnetic field current and the excitation winding resistance is used as the calibration base value to perform analog-to-digital conversion on the thyristor rectified voltage to obtain the excitation voltage per-unit base value.

[0017] Preferably, the evaluation indicators for grid-connected control performance include the PID parameter control effect of the main voltage loop, the PSS damping effect, the under-excitation limit, the over-excitation limit, and the stator current limit.

[0018] Preferably, the process also includes the following steps before conducting on-site simulation tests:

[0019] Input the electrical parameters of the synchronous generator of the field excitation control device, the no-load saturation characteristic curve, the electrical parameters of the excitation transformer, the electrical parameters of the main transformer, and the system connection reactance of the high-voltage side of the main transformer into the closed-loop simulation test system;

[0020] Start the on-site excitation control device and closed-loop simulation test system. The synchronous generator is initially in no-load state. After the synchronous generator speed reaches the rated speed, turn on the excitation switch and the excitation control device excitation switch in sequence. The synchronous generator excitation voltage reaches the no-load rated voltage.

[0021] A ±5% no-load step was applied to the excitation control device, and the response curve of the synchronous generator terminal voltage ±5% no-load step was recorded and compared with the response curve of the actual unit ±5% no-load step, in order to calibrate the accuracy of the closed-loop simulation system.

[0022] Turn on the synchronizing switch and wait for the synchronous generator to be connected to the controllable voltage source after passing the synchronization test and grid connection.

[0023] Slowly increase the governor output to boost the generator power to full load.

[0024] Preferably, the specific steps of the on-site simulation test include:

[0025] The PSS damping characteristics of the field excitation control device were evaluated by subjecting the load to ±3% step changes under full-load conditions of the generator.

[0026] Under the deep peak shaving condition of the generator, by increasing the voltage of the controllable voltage source, the generator is made to operate in a deep phase advance mode, and the load is increased by ±3%. The damping characteristics of the PSS of the field excitation control device under the deep peak shaving and phase advance mode are evaluated.

[0027] This application also provides a field simulation test system for a synchronous generator excitation control device. The system includes a real-time simulator, a synchronous generator electromagnetic transient simulation model, a high-speed analog output interface, a high-speed digital switch input interface, and an auxiliary power amplifier, wherein:

[0028] The high-speed digital switch input interface is electrically connected to the thyristor trigger pulse digital output interface of the field excitation control device, and is used to obtain the trigger command of the thyristor in the simulation model.

[0029] The analog output terminal of the electromagnetic transient simulation model of the synchronous generator is electrically connected to the analog sampling input terminal of the field excitation control device. The real-time simulator has built-in excitation voltage and excitation current calibration algorithms to calculate and calibrate the per-unit base values ​​of excitation voltage and excitation current.

[0030] The analog output terminal of the real-time simulator is electrically connected to the auxiliary power amplifier. The real-time simulator outputs the three-phase instantaneous voltage and current of the synchronous generator and the three-phase voltage of the low-voltage side of the excitation transformer. These are amplified by the power amplifier into suitable AC voltage and AC current, and then input to the field excitation control device through the analog sampling input interface of the field excitation control device as feedback quantity of the field excitation control device.

[0031] The high-speed digital switch input interface of the real-time simulator is electrically connected to the field excitation control device to receive the trigger pulse signal of the field excitation control device, thereby controlling the thyristor in the electromagnetic transient simulation model to turn on and off, forming a closed-loop connection between the excitation control device and the field simulation test system.

[0032] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the program, it implements a field simulation test method for a synchronous generator excitation control device as described in the embodiments of this application.

[0033] This application also provides a computer-readable storage medium storing a computer program thereon, characterized in that, when the program is executed by a processor, it implements a field simulation test method for a synchronous generator excitation control device as described in the embodiments of this application.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] This invention provides a method and system for on-site simulation testing of a synchronous generator excitation control device. It establishes an equivalent electromagnetic transient simulation model of the controlled generator and its excitation circuit by acquiring the detection-related parameters of the synchronous generator controlled by the on-site excitation control device. A test simulation platform is built, loaded with the equivalent electromagnetic transient simulation model of the controlled generator and its excitation circuit. This platform is connected to the trigger pulse output and analog sampling input interface of the on-site excitation control device. Digital dynamic simulation tests of the excitation control device and the generator are conducted, and the grid-connected control performance of the excitation control device is simulated on-site. The digital values ​​of the excitation voltage and excitation current participating in the on-site simulation test are calibrated based on the no-load saturation characteristic air gap magnetic field current value, and the on-site simulation test results are obtained. A test report is output based on the on-site test results, realistically restoring the grid-connected control characteristics of the on-site excitation control device on the on-site synchronous generator. This comprehensively evaluates the hardware and software design performance of the on-site excitation control device, identifies potential defects and hidden dangers in the device's hardware and software design and parameter tuning in advance, improves the unit's ability to withstand grid faults, and enhances the overall operational safety and stability of the grid and the unit. Attached Figure Description

[0036] Figure 1 This is a flowchart of the method in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the electromagnetic transient model structure in an embodiment of the present invention;

[0038] Figure 3 This is a diagram of the field simulation test system according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the excitation current per-unit basis value in an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] This embodiment provides a field simulation test method for a synchronous generator excitation control device, the specific steps of which include:

[0043] S1. Obtain the relevant detection parameters of the synchronous generator controlled by the field excitation control device and establish an equivalent electromagnetic transient simulation model of the controlled synchronous generator and excitation circuit.

[0044] Preferably, the relevant detection parameters of the synchronous generator controlled by the field excitation control device include electrical parameters, no-load saturation characteristic curve, excitation transformer electrical parameters, main transformer electrical parameters, main transformer high-voltage side system interconnection reactance, etc. The relevant detection parameters can be obtained from the corresponding manual of the field generator, the manufacturer, or through testing.

[0045] Preferred options, please refer to Figure 2 The electromagnetic transient model includes a synchronous generator and main transformer model, a grid-connected switch, a system equivalent reactance, a controllable voltage source model, an excitation transformer model, and an excitation circuit and starting circuit, wherein:

[0046] The main transformer model is connected to the controllable voltage source model via a grid-connected switch to serve as the load of the synchronous generator;

[0047] The excitation circuit includes a thyristor rectifier bridge, a resistor-capacitor absorption circuit, a demagnetizing switch, and an excitation load current source; the output terminal of the thyristor rectifier bridge is connected to the excitation load current source, and the input terminal is electrically connected to the synchronous generator through an excitation transformer model.

[0048] The thyristor rectifier bridge includes a six-pulse fully controlled bridge or a three-pulse semi-controlled rectifier bridge. The rectifier bridge adopts an RC absorption overvoltage circuit to suppress commutation overvoltage. The output voltage of the thyristor rectifier bridge is filtered and smoothed, then normalized using an excitation voltage calibration algorithm. This normalized voltage is used as the excitation voltage of the synchronous generator in the simulation to obtain the excitation current. The normalized excitation current is then normalized and used as the load current of the output circuit of the thyristor simulation model. The excitation voltage at the next moment is calculated by the circuit. In this embodiment, the output voltage of the thyristor rectifier bridge at time t0 is filtered and smoothed, then normalized using an excitation voltage and current calibration algorithm. This normalized excitation voltage is used as the excitation voltage of the synchronous generator and input to the synchronous generator in the simulation to obtain the normalized excitation current at time t1 = t0 + Δt. The normalized excitation current is then normalized and used as the load current of the output circuit of the thyristor rectifier bridge at time t1. The excitation voltage at time t1 + Δt is calculated by the circuit. This process is repeated to obtain the excitation voltage and current. In this embodiment, the circuit calculation is based on Kirchhoff's laws to calculate the output voltage of the thyristor circuit during the commutation process.

[0049] It is worth noting that nominal values ​​refer to the actual voltage, current, power, and impedance values, while per-unit values ​​are nominal values ​​divided by the reference values ​​selected by the user (such as reference voltage, reference power, and reference current and reference impedance values ​​calculated from the reference voltage and power). When performing power system calculations, the reference values ​​are selected first, and then the nominal values ​​of different voltage levels are converted into per-unit values. The equivalent circuit is drawn using the per-unit values ​​for calculation, and then the calculated per-unit values ​​are converted back to the nominal values ​​of the corresponding voltage level. Since nominal values ​​of different voltage levels cannot be calculated together, they need to be converted to the same voltage level first. Using per-unit values ​​as an intermediate quantity can reduce the number of conversions.

[0050] S2, see reference Figure 3 A closed-loop simulation test system is built. The closed-loop simulation test system is loaded with an electromagnetic transient simulation model and excitation voltage and excitation current calibration algorithms. The high-speed switching digital input interface of the closed-loop simulation test system is electrically connected to the thyristor trigger pulse output interface of the field excitation control device.

[0051] Preferably, the calibration algorithm for excitation voltage and excitation current is as follows:

[0052] Before conducting field simulation tests on the grid-connected control performance of the field excitation control device, to ensure that the test model is consistent with the actual generator characteristics, the per-unit base value of the excitation current is selected as the air gap magnetic field current corresponding to the rated voltage on the no-load saturation characteristic of the synchronous generator controlled by the field excitation control device, i.e., value B in the figure; the product of the rated air gap magnetic field current and the excitation winding resistance is used as the calibration base value to perform analog-to-digital conversion on the rectifier bridge output voltage to obtain the per-unit base value of the excitation voltage, i.e., B*R. f ;

[0053] S3. Conduct on-site simulation tests on the grid-connected control performance of the on-site excitation control device, obtain the on-site simulation test results, and output a test report based on the on-site simulation test results.

[0054] Preferably, the evaluation indicators for grid-connected control performance include the control effects of auxiliary control loops such as the PID parameter control effect of the main voltage loop, the PSS damping effect, under-excitation limitation, over-excitation limitation, and stator current limitation.

[0055] Preferably, the preparatory work before conducting on-site simulation tests includes:

[0056] Input the electrical parameters of the synchronous generator of the field excitation control device, the no-load saturation characteristic curve, the electrical parameters of the excitation transformer, the electrical parameters of the main transformer, and the relevant test parameters such as the interconnecting reactance of the main transformer high-voltage side system into the closed-loop simulation test system;

[0057] Start the on-site excitation control device and closed-loop simulation test system. The synchronous generator is initially in no-load state. After the synchronous generator speed reaches the rated speed, turn on the excitation switch and the excitation control device excitation switch in sequence. The synchronous generator excitation voltage reaches the no-load rated voltage.

[0058] A ±5% no-load step was performed on the excitation control device, and the response curve of the synchronous generator terminal voltage ±5% no-load step was recorded. The response curve was compared with that of the actual unit to calibrate the accuracy of the closed-loop simulation system.

[0059] Turn on the synchronizing switch and wait for the synchronous generator to be connected to the controllable voltage source after passing the synchronization test and grid connection. The synchronization grid connection refers to the process where the synchronous generator has been put into operation with the speed governor and excitation device, and when the amplitude, frequency and phase of the voltage of the generator to be connected are close to equal to the amplitude, frequency and phase of the voltage on the system side at the synchronization point, the generator is connected to the system through the synchronizing switch.

[0060] Slowly increase the governor output to boost the generator power to full load.

[0061] Preferably, the specific steps of the on-site simulation test include:

[0062] The PSS damping characteristics of the field excitation control device were evaluated by subjecting the load to ±3% step changes under full-load conditions of the generator.

[0063] Under the deep peak shaving condition of the generator, by increasing the voltage of the controllable voltage source, the generator is made to operate in deep phase advance mode, and the load is increased by ±3%. The damping characteristics of the PSS of the field excitation control device in deep peak shaving and phase advance mode are evaluated.

[0064] By controlling the instantaneous change in the voltage amplitude of a controllable voltage source, and combining this with evaluation indicators of grid-connected control performance, a test report is generated, outputting five dimensions: small disturbance stability, transient stability, static control accuracy, overexcitation limiting characteristics, and underexcitation limiting characteristics.

[0065] Example 2

[0066] This embodiment two provides a field simulation test system for a synchronous generator excitation control device. The system includes a real-time simulator, a synchronous generator electromagnetic transient simulation model, a high-speed analog output interface, a high-speed digital switch input interface, and an auxiliary power amplifier, wherein:

[0067] The high-speed digital switch input interface is electrically connected to the thyristor trigger pulse output interface of the field excitation control device, and is used to obtain the trigger command of the thyristor in the simulation model.

[0068] The analog output terminal of the electromagnetic transient simulation model of the synchronous generator is electrically connected to the analog sampling input terminal of the field excitation control device. The real-time simulator has built-in excitation voltage and excitation current calibration algorithms to calculate and calibrate the per-unit base values ​​of excitation voltage and excitation current.

[0069] The analog output terminal of the real-time simulator is electrically connected to the auxiliary power amplifier. The real-time simulator outputs the three-phase instantaneous voltage and current of the synchronous generator and the three-phase voltage of the low-voltage side of the excitation transformer. These are amplified by the power amplifier into suitable AC voltage and AC current, and then input to the field excitation control device through the analog sampling input interface of the field excitation control device as feedback quantity of the field excitation control device.

[0070] The high-speed digital switch input interface of the real-time simulator is electrically connected to the field excitation control device to receive the trigger pulse signal of the field excitation control device, thereby controlling the thyristor in the electromagnetic transient simulation model to turn on and off, forming a closed-loop connection between the excitation control device and the field simulation test system.

[0071] Example 3

[0072] This embodiment three provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The feature is that when the processor executes the program, it performs a field simulation test of a synchronous generator excitation control device as described in embodiment one of the present invention.

[0073] Example 4

[0074] This embodiment four provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs a field simulation test of a synchronous generator excitation control device as described in embodiment one of the present invention.

[0075] The systems and computer devices in Embodiments 2, 3, and 4 of the present invention are all based on the same inventive concept as in Embodiment 1. For other specific technical means, please refer to Embodiment 1, which will not be repeated here.

[0076] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A field simulation test method for a synchronous generator excitation control device, characterized in that, include: To establish an equivalent electromagnetic transient simulation model of the controlled synchronous generator and excitation circuit, relevant detection parameters of the synchronous generator controlled by the on-site excitation control device are obtained. This electromagnetic transient simulation model includes a synchronous generator and main transformer model, a grid-connected switch, system equivalent reactance, a controllable voltage source model, an excitation transformer model, and an excitation circuit and starting circuit. The excitation circuit includes a thyristor rectifier bridge, an RC snubber circuit, a demagnetizing switch, and an excitation load current source. The output terminal of the thyristor rectifier bridge is connected to the excitation load current source, and the input terminal is electrically connected to the synchronous generator through an excitation transformer model. The output voltage of the thyristor rectifier bridge is filtered and smoothed, then normalized using an excitation voltage calibration algorithm, and used as the excitation voltage of the synchronous generator to participate in the simulation to obtain the excitation current. The normalized value of the excitation current is normalized and used as the load current of the output circuit of the thyristor simulation model. The excitation voltage at the next moment is calculated by the circuit. A closed-loop simulation test system is built. The closed-loop simulation test system is loaded with an electromagnetic transient simulation model and an excitation voltage and excitation current calibration algorithm. The high-speed analog output interface and high-speed digital switch input interface of the closed-loop simulation test system are electrically connected to the analog input interface and the thyristor trigger pulse output interface of the field excitation device, respectively. The grid-connected control performance of the field excitation control device is simulated on-site, and the results of the on-site simulation test are obtained. A test report is then output based on the results of the on-site simulation test.

2. The on-site simulation test method for a synchronous generator excitation control device according to claim 1, characterized in that, The relevant detection parameters of the synchronous generator controlled by the field excitation control device include electrical parameters, no-load saturation characteristic curve, excitation transformer electrical parameters, main transformer electrical parameters, and main transformer high-voltage side system interconnection reactance.

3. The on-site simulation test method for a synchronous generator excitation control device according to claim 1, characterized in that, The main transformer model is connected to the controllable voltage source model via a grid-connected switch to serve as the load of the synchronous generator; The thyristor rectifier bridge includes a six-pulse fully controlled bridge or a three-pulse semi-controlled rectifier bridge. The rectifier bridge adopts a resistor-capacitor absorption overvoltage circuit to suppress commutation overvoltage. The excitation circuit includes an excitation switch and an excitation power supply. The excitation circuit is connected in parallel with the output terminal of the thyristor rectifier bridge to provide the initial excitation current when the voltage is boosted from zero. The system's equivalent reactance is used to provide a grid connection environment equivalent to that of the on-site generator.

4. The on-site simulation test method for a synchronous generator excitation control device according to claim 1, characterized in that, The specific calibration algorithm for excitation voltage and excitation current is as follows: Before conducting on-site simulation tests on the grid-connected control performance of the on-site excitation control device, the air gap magnetic field current corresponding to the rated voltage on the no-load saturation characteristic of the on-site synchronous generator is used as the excitation current per-unit base value, and the product of the rated air gap magnetic field current and the excitation winding resistance is used as the calibration base value to perform analog-to-digital conversion on the thyristor rectified voltage to obtain the excitation voltage per-unit base value.

5. The on-site simulation test method for a synchronous generator excitation control device according to claim 1, characterized in that, Evaluation indicators for grid-connected control performance include the PID parameter control effect of the main voltage loop, the PSS damping effect, low excitation limit, overexcitation limit, and stator current limit.

6. The on-site simulation test method for a synchronous generator excitation control device according to claim 3, characterized in that, Before conducting on-site simulation tests, the following also applies: Input the electrical parameters of the synchronous generator of the field excitation control device, the no-load saturation characteristic curve, the electrical parameters of the excitation transformer, the electrical parameters of the main transformer, and the system connection reactance of the high-voltage side of the main transformer into the closed-loop simulation test system; Start the on-site excitation control device and closed-loop simulation test system. The synchronous generator is initially in no-load state. After the synchronous generator speed reaches the rated speed, turn on the excitation switch and the excitation control device excitation switch in sequence. The synchronous generator excitation voltage reaches the no-load rated voltage. A ±5% no-load step was applied to the excitation control device, and the simulation curve of the ±5% no-load step response of the synchronous generator terminal voltage was recorded and compared with the ±5% no-load step response curve of the actual unit to calibrate the accuracy of the closed-loop simulation system. Turn on the synchronizing switch and wait for the synchronous generator to be connected to the controllable voltage source after passing the synchronization test and grid connection. Slowly increase the governor output to boost the generator power to full load.

7. The on-site simulation test method for a synchronous generator excitation control device according to claim 6, characterized in that, The specific steps of the on-site simulation test include: The PSS damping characteristics of the field excitation control device were evaluated by performing a ±3% step load change under full-load conditions on the generator. Under the deep peak shaving condition of the generator, by increasing the voltage of the controllable voltage source, the generator is made to operate in a deep phase advance mode, and the load is increased by ±3%. The damping characteristics of the PSS of the field excitation control device under the deep peak shaving and phase advance mode are evaluated. The performance of grid-connected control is evaluated by controlling the instantaneous change in the voltage amplitude of a controllable voltage source and combining this with evaluation indicators of grid-connected control performance.

8. A field simulation test system for a synchronous generator excitation control device, characterized in that, A field simulation test method for a synchronous generator excitation control device according to any one of claims 1 to 7, the system comprising a real-time simulator, a synchronous generator electromagnetic transient simulation model, a high-speed analog output interface, a high-speed digital switch input interface, and an auxiliary power amplifier, wherein: The high-speed digital switch input interface is electrically connected to the thyristor trigger pulse digital output interface of the field excitation control device, and is used to obtain the trigger command of the thyristor in the simulation model. The analog output terminal of the electromagnetic transient simulation model of the synchronous generator is electrically connected to the analog sampling input terminal of the field excitation control device. The real-time simulator has built-in excitation voltage and excitation current calibration algorithms to calculate and calibrate the per-unit base values ​​of excitation voltage and excitation current. The analog output terminal of the real-time simulator is electrically connected to the auxiliary power amplifier. The real-time simulator outputs the three-phase instantaneous voltage and current of the synchronous generator and the three-phase voltage of the low-voltage side of the excitation transformer. These are amplified by the power amplifier into suitable AC voltage and AC current, and then input to the field excitation control device through the analog sampling input interface of the field excitation control device as feedback quantity of the field excitation control device. The high-speed digital switch input interface of the real-time simulator is electrically connected to the field excitation control device to receive the trigger pulse signal of the field excitation control device, thereby controlling the thyristor in the electromagnetic transient simulation model to turn on and off, forming a closed-loop connection between the excitation control device and the field simulation test system.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements a field simulation test method for a synchronous generator excitation control device as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements a field simulation test method for a synchronous generator excitation control device as described in any one of claims 1 to 7.

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