Method and device for evaluating reactive voltage supporting capability of phase modifier in forced excitation state

Abstract

The embodiment of the invention provides a reactive voltage supporting capability evaluation method and device in a strong excitation state of a phase modifier. The method comprises the following steps: determining a strong excitation top value parameter of an excitation system; simulating a fault scene of a power grid system, and determining reactive power variation and a subtransient mathematical model of the phase modifier before and after a fault in the fault scene; determining a dynamic reactive current spectrum expression of the phase modifier in the subtransient process under the strong excitation state of the excitation system; determining the influence degree of the reactive voltage support level of the phase modifier under different control parameters according to the frequency spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state; according to the method, the modeling simulation time can be saved, the operation evaluation efficiency and accuracy of the reactive voltage support level of the phase modifier under the strong excitation state are improved, a basis is provided for model selection and optimization of control parameters of the excitation system of the phase modifier, and then powerful support is provided for primary loop and parameter design of the phase modifier.

Description

Technical Field

[0001] The present application relates to the field of power system automation, and in particular to a method and device for evaluating reactive voltage support capability of a phase regulator under a strong excitation state. Background Art

[0002] With the continuous development of large-capacity, long-distance UHV DC transmission technology, the problem of "strong DC and weak AC" in the power grid has become prominent, and the problem of voltage stability has become more prominent. In order to better solve the problems of system dynamic reactive power and insufficient voltage support caused by UHV DC transmission, and thus achieve the goal of "large DC transmission and strong reactive power support", it is important to adopt a more applicable, controllable and shorter reaction time dynamic reactive power regulation method.

[0003] At present, commonly used reactive power compensation equipment includes phase regulators, SVCs and STATCOMs. Phase regulators have the advantages of large capacity, strong reactive power support capability, strong ability to generate reactive power in a short time, good stability during operation and basically no harmonics. The inherent reactive power output characteristics of phase regulators are consistent with the characteristics required when a power grid fails, so they can solve the problems of insufficient reactive power and voltage instability. Since phase regulators also have the characteristics that reactive power compensation is almost unaffected by bus voltage and have strong overload capacity, the use of phase regulators can improve the ability to resist commutation failure of high- and low-end converters in layered access to UHV DC transmission systems.

[0004] Strong excitation means that when a fault occurs in the system and the voltage at the terminal of the phase regulator drops, the excitation system outputs strong excitation power within a certain period of time to improve the voltage support for the system. The reactive voltage support capacity of the phase regulator is one of the key indicators representing its dynamic performance. The rapid voltage support of the phase regulator in the strong excitation state is a key factor in ensuring the recovery of the system from the fault. There are many factors that affect the voltage support capacity of the phase regulator in the strong excitation state, such as the design of the strong excitation peak value multiple, the gain setting of the excitation system, etc. When the strong excitation peak value multiple increases, the voltage response speed and support strength of the phase regulator in the sub-transient and transient processes will increase, but it will also lead to problems of general concern such as increased motor costs and unfavorable temporary overvoltage suppression after fault recovery.

[0005] At present, the evaluation of voltage support capability and parameter optimization of phase-converter have not focused on the sub-transient process of phase-converter excitation, nor have they focused on the influence of control parameters such as the phase-converter excitation peak value multiple on the sub-transient process of excitation. Summary of the invention

[0006] In response to the problems in the prior art, the present application provides a method and device for evaluating the reactive voltage support capability of a phase-shifting machine under a strong excitation state, which can save time for modeling and simulation, improve the efficiency and accuracy of computational evaluation of the reactive voltage support level of the phase-shifting machine under a strong excitation state, provide a basis for the selection and optimization of control parameters of the phase-shifting machine excitation system, and further provide strong support for the primary circuit and parameter design of the phase-shifting machine.

[0007] In order to solve at least one of the above problems, the present application provides the following technical solutions:

[0008] According to a first aspect of an embodiment of the present application, the present application provides a method for evaluating reactive voltage support capability of a phase regulator in a strong excitation state, comprising:

[0009] Acquire setting parameters of the phase regulator and the excitation system, and determine the strong excitation peak value parameters of the excitation system according to the setting parameters;

[0010] Simulate a fault scenario of the power grid system, and determine the reactive power change of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario;

[0011] Determine the dynamic reactive current spectrum expression of the phase regulator in the strong excitation state of the excitation system in the sub-transient process according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model;

[0012] The influence degree of the reactive voltage support level of the phase regulator under different control parameters is determined according to the spectrum expression, and the reactive voltage support capability under the strong excitation state is evaluated according to the influence degree.

[0013] According to any embodiment of the present application, the step of obtaining setting parameters of the phase regulator and the excitation system, and determining the strong excitation peak value parameters of the excitation system according to the setting parameters includes:

[0014] Get the phase regulator load rated excitation voltage, phase regulator terminal voltage, excitation voltage reference value and current strong excitation multiple respectively;

[0015] The ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the strong excitation multiple and the excitation voltage reference value is used as the strong excitation peak value parameter of the excitation system.

[0016] According to any implementation manner of the present application, the method of determining the reactive change amount of the phase regulator before and after the fault and the sub-transient mathematical model in the fault scenario includes:

[0017] Determine the reactive power change of the phase regulator before and after the fault according to the voltage change of the power grid system and the change of the d-axis current of the phase regulator before and after the fault;

[0018] The subtransient mathematical model is constructed according to the d-axis synchronous reactance, d-axis subtransient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit subtransient time constant of the phase regulator.

[0019] According to any implementation manner of the present application, determining the influence of the reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression includes:

[0020] Performing an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression;

[0021] Based on the control variable method, different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system on the reactive voltage support level in the strong excitation state.

[0022] According to any implementation manner of the present application, the control variable method is based on which different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system under the strong excitation state on the reactive voltage support level, including:

[0023] Generate a corresponding time domain function image according to the time domain expression;

[0024] Different control parameters in the time domain expression are adjusted, and the degree of change of the time domain function image within the sub-transient time scale is recorded during the change of the control parameters.

[0025] According to a second aspect of an embodiment of the present application, the present application provides a device for evaluating reactive voltage support capability of a phase regulator in a strong excitation state, comprising:

[0026] The top value determination module is used to: obtain the setting parameters of the phase regulator and the excitation system, and determine the strong excitation top value parameters of the excitation system according to the setting parameters;

[0027] A fault simulation module is used to simulate a fault scenario of the power grid system and determine the reactive power change of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario;

[0028] An expression building module is used to determine the dynamic reactive current spectrum expression of the phase regulator in the sub-transient process under the strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model;

[0029] The support evaluation module is used to determine the influence of the reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression, and evaluate the reactive voltage support capability under the strong excitation state according to the influence degree.

[0030] According to any implementation of the present application, the top value determination module includes:

[0031] A parameter acquisition unit is used to respectively acquire the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the excitation voltage reference value and the current strong excitation multiple;

[0032] The top value calculation unit is used to: take the ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the strong excitation multiple and the excitation voltage reference value as the strong excitation top value parameter of the excitation system.

[0033] According to any implementation of the present application, the fault simulation module includes:

[0034] A reactive power variation determination unit, used to determine the reactive power variation of the phase regulator before and after the fault according to the voltage variation of the power grid system before and after the fault and the variation of the d-axis current of the phase regulator;

[0035] The sub-transient model determination unit is used to construct the sub-transient mathematical model according to the d-axis synchronous reactance, d-axis sub-transient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit sub-transient time constant of the phase regulator.

[0036] According to any implementation of the present application, the support assessment module includes:

[0037] A time domain conversion unit, used to: perform an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression;

[0038] The parameter control unit is used to adjust different control parameters in the time domain expression based on the control variable method to obtain the influence degree of different parameters of the droop phase excitation system on the reactive voltage support level in the strong excitation state.

[0039] According to any embodiment of the present application, the parameter control unit includes:

[0040] An image generating unit, used to: generate a corresponding time domain function image according to the time domain expression;

[0041] The change recording unit is used to adjust different control parameters in the time domain expression and record the degree of change of the time domain function image within the sub-transient time scale during the change of the control parameters.

[0042] According to the third aspect of the embodiment of the present application, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for evaluating the reactive voltage support capability of the phase-shifting machine under the strong excitation state are implemented.

[0043] According to a fourth aspect of an embodiment of the present application, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for evaluating reactive voltage support capability of a phase regulator under a strong excitation state.

[0044] According to the fifth aspect of the embodiment of the present application, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the method for evaluating the reactive voltage support capability of the phase-shifting machine under the strong excitation state.

[0045] It can be seen from the above technical scheme that the present application provides a method and device for evaluating the reactive voltage support capability of a phase regulator under the strong excitation state, by obtaining the setting parameters of the phase regulator and the excitation system, and determining the strong excitation peak value parameters of the excitation system according to the setting parameters; simulating the fault scenario of the power grid system, and determining the reactive power change and the sub-transient mathematical model of the phase regulator before and after the fault in the fault scenario; determining the dynamic reactive current spectrum expression of the phase regulator in the strong excitation state of the excitation system in the sub-transient process according to the strong excitation peak value parameters, the reactive power change and the sub-transient mathematical model; determining the influence of the reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state according to the influence degree; it can save the time of modeling and simulation, improve the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provide a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provide strong support for the primary circuit and parameter design of the phase regulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the above drawings without paying creative work.

[0047] Figure 1 The electrical vector diagram of the phase modulator in the embodiment of the present application;

[0048] Figure 2 This is one of the flow charts of the method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state in the embodiment of the present application;

[0049] Figure 3 This is a second flow chart of a method for evaluating reactive voltage support capability of a phase regulator under a strong excitation state in an embodiment of the present application;

[0050] Figure 4 The third flow chart of the method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state in the embodiment of the present application;

[0051] Figure 5 This is a fourth flow chart of a method for evaluating reactive voltage support capability of a phase regulator under a strong excitation state in an embodiment of the present application;

[0052] Figure 6 This is a flowchart of the fifth method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state in the embodiment of the present application;

[0053] Figure 7 This is a simulation model diagram of the RTDS simulated on-site phase adjustment system in the embodiment of the present application;

[0054] Figure 8 The RTDS in the embodiment of the present application simulates the three-phase instantaneous short-circuit phase regulator response characteristics on the high-voltage side of the main transformer;

[0055] Fig. 9 The RTDS in the embodiment of the present application simulates the excitation voltage response characteristics of the three-phase instantaneous short-circuit phase regulator on the high-voltage side of the main transformer;

[0056] Fig.10 The reactive current response characteristics of the three-phase instantaneous short-circuit phase regulator on the high-voltage side of the main transformer simulated by RTDS in the embodiment of the present application;

[0057] Fig.11 The reactive current response characteristics of the three-phase instantaneous short-circuit phase regulator on the high-voltage side of the main transformer are calculated by MATLAB in the embodiment of the present application;

[0058] Fig.12 This is one of the structural diagrams of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment of the present application;

[0059] Fig.13 This is the second structural diagram of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment of the present application;

[0060] Fig.14 This is the third structural diagram of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment of the present application;

[0061] Fig.15 This is the fourth structural diagram of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment of the present application;

[0062] Fig.16 This is the fifth structural diagram of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment of the present application;

[0063] Fig.17It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0066] Taking into account that when the multiple of the strong excitation peak value increases, the voltage response speed and support strength of the phase regulator in the sub-transient and transient processes will increase, but it will also lead to increased motor costs and is not conducive to temporary overvoltage suppression after fault recovery and other common problems, the present application provides a method and device for evaluating the reactive voltage support capacity of the phase regulator under the strong excitation state, which saves the time of modeling and simulation, improves the computational evaluation efficiency and accuracy of the reactive voltage support level of the phase regulator under the strong excitation state, provides a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provides strong support for the primary circuit and parameter design of the phase regulator.

[0067] In order to save the time of modeling and simulation, improve the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provide a basis for the optimization of the control parameter selection of the phase regulator excitation system, and further provide strong support for the primary circuit and parameter design of the phase regulator, this application provides an embodiment of a method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state, see Figure 1 The reactive voltage support capability evaluation method of the phase shifter under the strong excitation state specifically includes the following contents:

[0068] Step S101: obtaining setting parameters of a phase regulator and an excitation system, and determining a strong excitation peak value parameter of the excitation system according to the setting parameters.

[0069] In this step, the setting parameters of the phase regulator and the excitation system are first collected, including but not limited to the electrical characteristic parameters of the phase regulator and the operating parameters of the excitation system, and then the above parameters are used to determine the strong excitation peak value parameters of the excitation system. The peak value parameters are the key parameters for the strong excitation power output of the excitation system when the system fails.

[0070] In a single-machine-infinite system, ignoring the stator resistance and DC component of the synchronous motor's stator current, the electrical vector diagram of the phase regulator is as follows: Figure 2 shown.

[0071] exist Figure 2 In the formula, It is the current at the phase regulator terminal; Ut is the voltage at the phase regulator terminal; Xk is equivalent to the external reactance of the phase regulator (the sum of the short-circuit reactance of the step-up transformer and the line reactance); U is the system voltage at infinity; E″ q is the q-axis subtransient potential; EQ is the imaginary electromotive force corresponding to Xq; Utq is the q-axis component of the machine-end voltage; Itq is the q-axis component of the machine-end current.

[0072] In one embodiment of the method for evaluating reactive voltage support capability of a phase regulator under strong excitation of the present application, see Figure 3 The step of obtaining the setting parameters of the phase regulator and the excitation system, and determining the strong excitation peak value parameters of the excitation system according to the setting parameters, may also specifically include the following contents:

[0073] Step S101A: respectively obtaining the phase modulator load rated excitation voltage, the phase modulator terminal voltage, the excitation voltage reference value and the current strong excitation multiple;

[0074] Step S101B: taking the ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the excitation multiple and the excitation voltage reference value as the excitation peak value parameter of the excitation system.

[0075] For example, the phase regulator usually adopts a self-parallel excitation system. When a system failure occurs, the voltage at the phase regulator terminal drops and the excitation is forced to output. The excitation multiple is K. s , then the excitation voltage output during strong excitation is

[0076]

[0077] In formula 1, U fN is the rated excitation voltage of the phase regulator load, U fb is the excitation voltage reference value (excitation voltage of the phase regulator when it is rated at no load), K b It is the ratio of the load rated excitation voltage to the excitation voltage reference value, generally 2.5 to 3.

[0078] Step S102: simulating a fault scenario of the power grid system, and determining the reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario.

[0079] In this step, the fault scenario of the power grid system is simulated to simulate the system before and after the fault. Before and after the fault, the reactive power change of the phase regulator is calculated, and the sub-transient mathematical model of the phase regulator is established to analyze its dynamic behavior under the strong excitation state.

[0080] In one embodiment of the method for evaluating reactive voltage support capability of a phase regulator under strong excitation of the present application, see Figure 4, the determination of reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario may also specifically include the following contents:

[0081] Step S102A: Determine the reactive power variation of the phase regulator before and after the fault according to the voltage variation of the power grid system before and after the fault and the variation of the d-axis current of the phase regulator.

[0082] Step S102B: construct the subtransient mathematical model according to the d-axis synchronous reactance, d-axis subtransient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit subtransient time constant of the phase regulator.

[0083] For example, since the power angle δ is approximately 0 when the phase regulator is running, the reactive power Q injected into the system by the phase regulator is:

[0084] Q≈Ui d (1)

[0085] The reactive power change of the phase regulator before and after the system failure is:

[0086] ΔQ=QQ 0 ≈Ui d -U 0 i d0 =UΔi d +ΔUi d0 (2)

[0087] In formula (3), the change of system voltage U ΔU mainly depends on the system operating conditions, grid structure and fault conditions, and has no direct relationship with the phase regulator parameters, while the change of phase regulator reactive current (d-axis current) Δi d It indicates the reactive voltage support level of the phase regulator, which is closely related to the structural parameters and control parameters of the phase regulator.

[0088] The sub-transient mathematical model of the phase regulator can be expressed as the following set of equations.

[0089]

[0090] In formula (4), X d is the d-axis synchronous reactance; X″ d is the d-axis subtransient reactance; id is the d-axis current; Ef is the excitation voltage; E′ q is the q-axis transient potential; X' d is the d-axis transient reactance; T′ d0 is the d-axis open-circuit transient time constant; T″ d0 is the d-axis open-circuit subtransient time constant.

[0091] Step S103: determining a dynamic reactive current spectrum expression of the phase regulator in a sub-transient process under a strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model.

[0092] Among them, the dynamic reactive current spectrum expression of the phase regulator excitation system under the strong excitation state is derived by using the determined strong excitation peak value parameters, reactive change and sub-transient mathematical model. The expression is used to characterize the change law of the reactive current of the phase regulator under the strong excitation state over time.

[0093] For example, formula (1), formula (3) and formula (4) and their deviation equations are combined to obtain:

[0094]

[0095] In one embodiment of the method for evaluating reactive voltage support capability of a phase regulator under strong excitation of the present application, see Figure 5 The method of determining the influence of reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression may also specifically include the following contents:

[0096] Step S103A: performing an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression.

[0097] Step S103B: Based on the control variable method, different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system in the strong excitation state on the reactive voltage support level.

[0098] For example, the inverse Laplace transform of formula (5) can be used to obtain Δi d The time domain expression of the phase shifter can be obtained by using software tools for inverse Laplace transform calculation and time domain image analysis. The sensitivity of different parameters of the phase shifter excitation system under strong excitation to the reactive voltage support level can be further analyzed through the control variable method, providing a theoretical basis for parameter optimization and motor design.

[0099] In one embodiment of the method for evaluating reactive voltage support capability of a phase regulator under strong excitation of the present application, see Figure 6 , the control variable method is based on which different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system on the reactive voltage support level in the strong excitation state, which may also specifically include the following contents:

[0100] Step S103B1: Generate a corresponding time domain function image according to the time domain expression.

[0101] Step S103B2: adjusting different control parameters in the time domain expression, and recording the degree of change of the time domain function image within the sub-transient time scale during the change of the control parameters.

[0102] Exemplarily, by using the control variable method, key control parameters such as the strong excitation peak value multiple are set as variable control variables, while other parameters that may affect the results are kept constant, which helps to isolate the impact of a single factor and conduct in-depth research on the dynamic characteristics of the phase shifter excitation system under the strong excitation state.

[0103] For different values ​​of each control variable, a corresponding time domain function image is generated. The above image shows the changing trend of current, voltage or other key variables in the time scale under the strong excitation state of the phase regulator.

[0104] Special attention may be paid to the degree of change within the sub-transient time scale (usually around 0.1 seconds), which reflects the transient response of the phase-converter excitation system after a system failure and is an important period for evaluating the dynamic performance of the system.

[0105] Combined with factors such as motor design cost, a comprehensive analysis of the time domain function image is performed. Factors such as motor design cost, system stability, and reactive voltage support level are considered to find the optimal control parameter configuration. This provides a theoretical reference for the optimization of the phase-converter excitation system, helps to weigh different factors, and enables the system to achieve the best performance under strong excitation.

[0106] Step S104: determining the influence degree of the reactive voltage support level of the phase regulator under different control parameters according to the frequency spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state according to the influence degree.

[0107] In this step, the reactive voltage support level of the phase regulator under strong excitation is quantitatively evaluated by analyzing the spectrum expression under different control parameter values, and the reactive voltage support capability under strong excitation is evaluated. This includes comparing and summarizing the performance of the system under different control parameters to determine which parameter configuration can maximize the reactive voltage support level.

[0108] For example, if it is found through analysis that increasing the strong excitation peak value multiple can improve the reactive voltage support level without causing adverse effects on other aspects of the system, then the positive impact of increasing the strong excitation peak value multiple on the reactive voltage support capability under the strong excitation state can be evaluated. For example, the increase in the strong excitation peak value multiple may increase the voltage response speed of the phase regulator and improve the voltage support function after a system fault.

[0109] In addition, the influence of different excitation system gain values ​​on reactive voltage support level is considered. By analyzing the spectrum expression, the optimal range of gain values ​​can be determined to balance improving voltage support capability and avoiding the risk of system instability.

[0110] Furthermore, considering the effect of adjusting the value of the subtransient reactance on the reactive voltage support level, it may be found that adjustment within a certain range can improve the voltage response speed of the phase shifter under strong excitation, thereby enhancing the voltage support effect.

[0111] It is also possible to combine the influence of different control parameters to find the best parameter combination under strong excitation, and to make trade-offs based on the mutual influence between different parameters and factors such as motor design cost.

[0112] Finally, by analyzing the spectrum expression, we can understand the changes in spectrum characteristics under different control parameters, such as the changes in the peak value in the spectrum, the changes in frequency distribution, etc. The above characteristics provide useful information for evaluating system performance.

[0113] It is understandable that the above examples only provide some possible scenarios when evaluating the reactive voltage support capability under strong excitation. The final evaluation should comprehensively consider the above influences to determine the optimal performance configuration of the system under specific working conditions. This application does not limit the specific evaluation strategy.

[0114] From the above description, it can be seen that the method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state provided in the embodiment of the present application can save the time of modeling and simulation, improve the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provide a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provide strong support for the primary circuit and parameter design of the phase regulator.

[0115] In order to further illustrate the present solution, the present application also provides a specific application example of the reactive voltage support capability evaluation method of the phase shifter under the strong excitation state using the above-mentioned phase shifter under the strong excitation state reactive voltage support capability evaluation device to implement the phase shifter under the strong excitation state, which specifically includes the following contents:

[0116] Taking a phase-shifting unit of a new energy station in North China as an example, a single-machine infinite system with the same equivalent impedance parameters as the on-site phase-shifting system, main transformer and transmission line is built in the simulation system RTDS. The equivalent model is shown in the figure below. The fault point is set on the transmission line on the high-voltage side of the main transformer, with a three-phase instantaneous short circuit of 0.2s and a short-circuit resistance of 1.5Ω.

[0117] like Figure 7 As shown, the d-axis synchronous reactance X of the phase regulator d 1.003pu, d-axis transient reactance X' d0.1205pu, d-axis sub-transient reactance X' d ' is 0.0909pu, the total reactance of the main transformer and transmission line is X k 0.14pu, d-axis open circuit transient time constant T d ' 0 is 7.38s, and the d-axis open circuit subtransient time constant T d ” 0 is 0.044s, the initial terminal voltage of the phase regulator is U t0 is 1 p.u., the initial d-axis current i d0 The rated excitation voltage of the phase regulator under load is 2.7 times of the rated excitation voltage under no-load condition, i.e. K b is 2.7.

[0118] Now analyze the strong excitation setting multiple K of the current phase regulator s When the voltage is 2.5 and 3.5 times the rated excitation voltage respectively, the corresponding reactive voltage support level under the excitation strong excitation state.

[0119] The simulation results of RTDS are as follows: Figure 8 As shown, the dark curve has a peak excitation value multiple of 2.5 times the rated excitation voltage, and the light curve has a peak excitation value multiple of 3.5 times the rated excitation voltage.

[0120] The fault occurs at t1 = 6s, and the excitation voltage is amplified as Fig. 9 The phase regulator excitation state is generally maintained before the end of the short circuit time (6.2s in this example). The example selects the reactive current support situation 0.15s after the phase regulator excitation peak value appears during the fault for comparison.

[0121] Depend on Fig. 9 It can be seen that the excitation voltage of the light-colored curve reaches its peak value at t2 = 6.0234s. The reactive current of the phase regulator at t3 = t2 + 0.15s = 6.1734s is selected for comparison. Fig.10 shown.

[0122] Depend on Fig.10 It can be obtained that when the phase-converter excitation system has a strong excitation multiple of 2.5 times the top value, the reactive current in the strong excitation state at time t3 is 2.38243pu; when the phase-converter excitation system has a strong excitation multiple of 3.5 times the top value, the reactive current in the strong excitation state at time t3 is 2.53498pu, among which the reactive current increases by 6.40% compared with the strong excitation multiple of 2.5 times the top value.

[0123] Combined with the application method in Section 2.1, input the example parameters into Matlab, and divide the phase shifter parameters by the strong excitation peak value multiple K sAll the parameters are known. Substitute all the parameters into equation (1) and perform reverse transformation to obtain the time domain expression and function graph of the phase-shifting reactive current. Compare K s The reactive current output characteristics when the values ​​are 2.5 and 3.5 are as follows: Fig.11 shown.

[0124] Depend on Fig.11 It can be obtained that when the phase-shifting machine excitation system has a strong excitation multiple of 2.5 times the top value, the reactive current at 0.15s when the strong excitation occurs is 1.714pu; when the phase-shifting machine excitation system has a strong excitation multiple of 3.5 times the top value, the reactive current at 0.15s when the strong excitation occurs is 1.832pu, wherein the reactive current is increased by 6.88% compared with the strong excitation multiple of 2.5 times the top value, which is very different from the result obtained by simulation, verifying the effectiveness of the method proposed in this application for analyzing the influence of different control parameters such as the strong excitation top value multiple of the phase-shifting machine on its reactive voltage support capacity under the strong excitation state.

[0125] In order to save the time of modeling and simulation, improve the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provide a basis for the optimization of the control parameter selection of the phase regulator excitation system, and further provide strong support for the primary circuit and parameter design of the phase regulator, the present application provides an embodiment of a phase regulator reactive voltage support capability evaluation device under the strong excitation state for realizing all or part of the contents of the phase regulator reactive voltage support capability evaluation method under the strong excitation state, see Fig.12 The reactive voltage support capability evaluation device of the phase regulator under the strong excitation state specifically includes the following contents:

[0126] The top value determination module 1101 is used to: obtain the setting parameters of the phase regulator and the excitation system, and determine the strong excitation top value parameters of the excitation system according to the setting parameters;

[0127] The fault simulation module 1102 is used to: simulate the fault scenario of the power grid system, and determine the reactive power change of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario;

[0128] The expression building module 1103 is used to determine the dynamic reactive current spectrum expression of the phase regulator in the sub-transient process under the strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model;

[0129] The support evaluation module 1104 is used to determine the influence of the reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression, and evaluate the reactive voltage support capability under the strong excitation state according to the influence degree.

[0130] According to any embodiment of the present application, see Fig.13, the top value determination module includes:

[0131] The parameter acquisition unit 1101A is used to respectively acquire the phase modulator load rated excitation voltage, the phase modulator terminal voltage, the excitation voltage reference value and the current strong excitation multiple;

[0132] The top value calculation unit 1101B is used to: use the ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, and the strong excitation multiple to the excitation voltage reference value as the strong excitation top value parameter of the excitation system.

[0133] According to any embodiment of the present application, see Fig.14 , the fault simulation module includes:

[0134] The reactive power variation determination unit 1102A is used to determine the reactive power variation of the phase regulator before and after the fault according to the voltage variation of the power grid system before and after the fault and the variation of the d-axis current of the phase regulator;

[0135] The sub-transient model determination unit 1102B is used to construct the sub-transient mathematical model according to the d-axis synchronous reactance, d-axis sub-transient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit sub-transient time constant of the phase regulator.

[0136] According to any embodiment of the present application, see Fig.15 , the support assessment module includes:

[0137] The time domain conversion unit 1103A is used to: perform an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression;

[0138] The parameter control unit 1103B is used to adjust different control parameters in the time domain expression based on the control variable method to obtain the influence degree of different parameters of the phase regulator excitation system on the reactive voltage support level in the strong excitation state.

[0139] According to any embodiment of the present application, see Fig.16 , the parameter control unit comprises:

[0140] The image generating unit 1103B1 is used to generate a corresponding time domain function image according to the time domain expression;

[0141] The change recording unit 1103B2 is used to adjust different control parameters in the time domain expression and record the degree of change of the time domain function image within the sub-transient time scale during the change of the control parameters.

[0142] From the hardware level, in order to save the time of modeling and simulation, improve the efficiency and accuracy of the calculation evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provide a basis for the optimization of the control parameter selection of the phase regulator excitation system, and further provide strong support for the primary circuit and parameter design of the phase regulator, the present application provides an embodiment of an electronic device for implementing all or part of the contents of the method for evaluating the reactive voltage support capability of the phase regulator under the strong excitation state, and the electronic device specifically includes the following contents:

[0143] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the reactive voltage support capability evaluation device under the phase shifter strong excitation state and related equipment such as the core business system, user terminal and related database; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., and the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the reactive voltage support capability evaluation method under the phase shifter strong excitation state and the embodiment of the reactive voltage support capability evaluation device under the phase shifter strong excitation state in the embodiment, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0144] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0145] In practical applications, part of the method for evaluating reactive voltage support capability under phase shifter strong excitation state can be executed on the electronic device side as described above, or all operations can be completed in the client device. The selection can be made based on the processing capability of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0146] The client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0147] Fig.17 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Fig.17 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Fig.17 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0148] In one embodiment, the reactive voltage support capability evaluation method function of the phase regulator under the strong excitation state can be integrated into the central processor 9100. The central processor 9100 can be configured to perform the following control:

[0149] Step S101: obtaining setting parameters of a phase regulator and an excitation system, and determining a strong excitation peak value parameter of the excitation system according to the setting parameters.

[0150] Step S102: simulating a fault scenario of the power grid system, and determining the reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario.

[0151] Step S103: determining a dynamic reactive current spectrum expression of the phase regulator in a sub-transient process under a strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model.

[0152] Step S104: determining the influence degree of the reactive voltage support level of the phase regulator under different control parameters according to the frequency spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state according to the influence degree.

[0153] From the above description, it can be seen that the electronic device provided in the embodiment of the present application saves the time of modeling and simulation, improves the efficiency and accuracy of the calculation and evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provides a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provides strong support for the primary circuit and parameter design of the phase regulator.

[0154] In another embodiment, the device for evaluating the reactive voltage supporting capability of the phase regulator in the strong excitation state can be configured separately from the central processing unit 9100. For example, the device for evaluating the reactive voltage supporting capability of the phase regulator in the strong excitation state can be configured as a chip connected to the central processing unit 9100, and the function of the method for evaluating the reactive voltage supporting capability of the phase regulator in the strong excitation state can be realized through the control of the central processing unit.

[0155] like Fig.17As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Fig.17 In addition, the electronic device 9600 may also include Fig.17 For components not shown, reference may be made to the prior art.

[0156] like Fig.17 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0157] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0158] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0159] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0160] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0161] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0162] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0163] The embodiment of the present application also provides a computer-readable storage medium capable of implementing all steps of the method for evaluating reactive voltage support capability of a phase shifter under a strong excitation state in the above embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all steps of the method for evaluating reactive voltage support capability of a phase shifter under a strong excitation state in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0164] Step S101: obtaining setting parameters of a phase regulator and an excitation system, and determining a strong excitation peak value parameter of the excitation system according to the setting parameters.

[0165] Step S102: simulating a fault scenario of the power grid system, and determining the reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario.

[0166] Step S103: determining a dynamic reactive current spectrum expression of the phase regulator in a sub-transient process under a strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model.

[0167] Step S104: determining the influence degree of the reactive voltage support level of the phase regulator under different control parameters according to the frequency spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state according to the influence degree.

[0168] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present application saves the time of modeling and simulation, improves the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provides a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provides strong support for the primary circuit and parameter design of the phase regulator.

[0169] The embodiment of the present application also provides a computer program product capable of implementing all steps of the method for evaluating reactive voltage support capability of a phase shifter under a strong excitation state in the above embodiment, where the execution subject is a server or a client. When the computer program / instruction is executed by a processor, the steps of the method for evaluating reactive voltage support capability of a phase shifter under a strong excitation state are implemented. For example, the computer program / instruction implements the following steps:

[0170] Step S101: obtaining setting parameters of a phase regulator and an excitation system, and determining a strong excitation peak value parameter of the excitation system according to the setting parameters.

[0171] Step S102: simulating a fault scenario of the power grid system, and determining the reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario.

[0172] Step S103: determining a dynamic reactive current spectrum expression of the phase regulator in a sub-transient process under a strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model.

[0173] Step S104: determining the influence degree of the reactive voltage support level of the phase regulator under different control parameters according to the frequency spectrum expression, and evaluating the reactive voltage support capability under the strong excitation state according to the influence degree.

[0174] From the above description, it can be seen that the computer program product provided in the embodiment of the present application saves the time of modeling and simulation, improves the efficiency and accuracy of the computational evaluation of the reactive voltage support level of the phase regulator under the strong excitation state, provides a basis for the selection and optimization of the control parameters of the phase regulator excitation system, and further provides strong support for the primary circuit and parameter design of the phase regulator.

[0175] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0176] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (apparatus), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. The above-mentioned computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0177] The above-mentioned computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0178] The above-mentioned computer program instructions can also be loaded into a computer or other programmable data processing device so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0179] Specific embodiments are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core idea of ​​this application. At the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. A method for evaluating reactive voltage support capability of a phase shifter under strong excitation state, characterized in that: The method comprises: Acquire setting parameters of the phase regulator and the excitation system, and determine the strong excitation peak value parameters of the excitation system according to the setting parameters; Simulate a fault scenario of the power grid system, and determine the reactive power change of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario; Determine the dynamic reactive current spectrum expression of the phase regulator in the strong excitation state of the excitation system in the sub-transient process according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model; The influence degree of the reactive voltage support level of the phase regulator under different control parameters is determined according to the spectrum expression, and the reactive voltage support capability under the strong excitation state is evaluated according to the influence degree.

2. The method for evaluating reactive voltage support capability of a phase shifter under strong excitation state according to claim 1 is characterized in that: The step of obtaining setting parameters of the phase regulator and the excitation system, and determining the strong excitation peak value parameters of the excitation system according to the setting parameters, includes: Get the phase regulator load rated excitation voltage, phase regulator terminal voltage, excitation voltage reference value and current strong excitation multiple respectively; The ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the strong excitation multiple and the excitation voltage reference value is used as the strong excitation peak value parameter of the excitation system.

3. The method for evaluating reactive voltage support capability of a phase shifter under strong excitation state according to claim 1 is characterized in that: The method of determining the reactive power variation of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario includes: Determine the reactive power change of the phase regulator before and after the fault according to the voltage change of the power grid system and the change of the d-axis current of the phase regulator before and after the fault; The subtransient mathematical model is constructed according to the d-axis synchronous reactance, d-axis subtransient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit subtransient time constant of the phase regulator.

4. The method for evaluating reactive voltage support capability of a phase shifter under strong excitation state according to claim 1 is characterized in that: The determining, according to the spectrum expression, the influence degree of the reactive voltage support level of the phase regulator under different control parameters comprises: Performing an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression; Based on the control variable method, different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system on the reactive voltage support level in the strong excitation state.

5. The method for evaluating reactive voltage support capability of a phase shifter under strong excitation state according to claim 4 is characterized in that: Based on the control variable method, different control parameters in the time domain expression are adjusted to obtain the influence of different parameters of the RC phase excitation system under the strong excitation state on the reactive voltage support level, including: Generate a corresponding time domain function image according to the time domain expression; Different control parameters in the time domain expression are adjusted, and the degree of change of the time domain function image within the sub-transient time scale is recorded during the change of the control parameters.

6. A device for evaluating reactive voltage support capability of a phase regulator under strong excitation, characterized in that: The device comprises: The top value determination module is used to: obtain the setting parameters of the phase regulator and the excitation system, and determine the strong excitation top value parameters of the excitation system according to the setting parameters; A fault simulation module is used to simulate a fault scenario of the power grid system and determine the reactive power change of the phase regulator before and after the fault and the sub-transient mathematical model under the fault scenario; An expression building module is used to determine the dynamic reactive current spectrum expression of the phase regulator in the sub-transient process under the strong excitation state of the excitation system according to the strong excitation peak value parameter, the reactive change amount and the sub-transient mathematical model; The support evaluation module is used to determine the influence of the reactive voltage support level of the phase regulator under different control parameters according to the spectrum expression, and evaluate the reactive voltage support capability under the strong excitation state according to the influence degree.

7. The reactive voltage support capability evaluation device of the phase shifter under strong excitation state according to claim 6 is characterized in that: The top value determination module comprises: A parameter acquisition unit is used to respectively acquire the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the excitation voltage reference value and the current strong excitation multiple; The top value calculation unit is used to: take the ratio of the product of the rated excitation voltage of the phase modulator load, the phase modulator terminal voltage, the strong excitation multiple and the excitation voltage reference value as the strong excitation top value parameter of the excitation system.

8. The reactive voltage support capability evaluation device of the phase shifter under strong excitation state according to claim 6 is characterized in that: The fault simulation module comprises: A reactive power variation determination unit, used to determine the reactive power variation of the phase regulator before and after the fault according to the voltage variation of the power grid system before and after the fault and the variation of the d-axis current of the phase regulator; The sub-transient model determination unit is used to construct the sub-transient mathematical model according to the d-axis synchronous reactance, d-axis sub-transient reactance, d-axis current, excitation voltage, q-axis transient potential, d-axis transient reactance, d-axis open-circuit transient time constant and d-axis open-circuit sub-transient time constant of the phase regulator.

9. The reactive voltage support capability evaluation device of the phase shifter under strong excitation state according to claim 6, characterized in that: The support assessment module includes: A time domain conversion unit, used to: perform an inverse Laplace transform on the spectrum expression to obtain a corresponding time domain expression; The parameter control unit is used to adjust different control parameters in the time domain expression based on the control variable method to obtain the influence degree of different parameters of the droop phase excitation system on the reactive voltage support level in the strong excitation state.

10. The reactive voltage support capability evaluation device of the phase shifter under strong excitation state according to claim 9, characterized in that: The parameter control unit comprises: An image generating unit, used to: generate a corresponding time domain function image according to the time domain expression; The change recording unit is used to adjust different control parameters in the time domain expression and record the degree of change of the time domain function image within the sub-transient time scale during the change of the control parameters.

11. 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, the steps of the method for evaluating the reactive voltage supporting capability of a phase regulator under a strong excitation state as described in any one of claims 1 to 5 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for evaluating the reactive voltage supporting capability of a phase regulator under a strong excitation state as described in any one of claims 1 to 5 are implemented.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for evaluating the reactive voltage supporting capability of a phase regulator under a strong excitation state as described in any one of claims 1 to 5 are implemented.

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