Amplitude-phase corrector parameter design method and system

Abstract

The invention discloses an amplitude-phase corrector parameter design method and system, and belongs to the technical field of flexible direct current transmission, and the method comprises the steps: constructing a flexible direct current system broadband impedance model comprising an alternating current side impedance, a current converter impedance and a direct current side impedance; selecting an amplitude-phase corrector structure and constructing a parameter space of the amplitude-phase corrector structure; establishing a multi-objective optimization function fusing an impedance amplitude error, a phase error, oscillation modal damping and formant suppression; performing automatic optimization in the parameter space by adopting an intelligent optimization algorithm to obtain candidate optimal parameters; carrying out quantitative verification on the parameters to ensure that the impedance is smooth, the stability margin is sufficient, the resonance suppression is effective and the damping reaches the standard; if the verification is passed, outputting final parameters, otherwise, re-optimizing until the requirements are met. According to the method, automation and multi-target collaborative optimization of parameter design of the amplitude-phase corrector are realized, the design efficiency and the broadband oscillation suppression effect are remarkably improved, and safe and stable operation of the flexible direct current system is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of flexible DC transmission technology, and particularly relates to a method and system for designing amplitude and phase corrector parameters. Background Technology

[0002] With the large-scale grid connection of new energy sources such as wind power and photovoltaics, flexible DC transmission systems have become a core technology supporting the consumption of new energy and grid interconnection. However, due to factors such as converter nonlinearity, complex control interaction, and AC / DC impedance coupling, flexible DC systems are prone to oscillation problems covering a wide frequency band, which seriously threatens the safe and stable operation of the system and is a key technical bottleneck restricting its large-scale application.

[0003] Amplitude and phase correctors are a common method for suppressing such broadband oscillations. However, existing parameter design methods have significant drawbacks: firstly, they heavily rely on the experience of engineers, employing manual adjustments, which is inefficient and difficult to adapt to complex broadband operating conditions; secondly, the design process often focuses only on a single performance indicator, lacking a multi-objective collaborative optimization mechanism, resulting in poor broadband suppression and the system still having the risk of oscillation in some frequency bands. Therefore, there is an urgent need for a design method that can efficiently, accurately, and comprehensively optimize the parameters of amplitude and phase correctors. Summary of the Invention

[0004] This invention provides a method, system, and readable storage medium for designing amplitude and phase corrector parameters, which solves the problems of low efficiency and one-sided parameter configuration in manual parameter tuning, and achieves multi-dimensional collaborative optimization of system stability performance over a wide frequency range.

[0005] In a first aspect, the present invention provides a method for designing amplitude and phase corrector parameters, comprising: An impedance model for a flexible DC transmission system is constructed, comprising an AC system impedance model, a converter impedance model, and a DC system impedance model. Select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure; A wideband multi-objective optimization function is constructed based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function. An optimization algorithm is used to solve the problem in the parameter space. The candidate optimal solution of the amplitude and phase corrector parameters is obtained by using the wideband multi-objective optimization function as the fitness function. The candidate optimal solution is substituted into the impedance model of the flexible DC transmission system for parameter verification to determine whether it meets the preset wideband oscillation suppression condition. If the broadband oscillation suppression condition is met, the candidate optimal solution is output as the optimal amplitude-phase corrector parameter. If not, the optimization and verification are repeated until the parameter that meets the broadband oscillation suppression condition is obtained.

[0006] Secondly, the present invention provides an amplitude and phase corrector parameter design system, comprising: The first construction module is configured to construct an impedance model of a flexible DC transmission system, which includes an AC system impedance model, a converter impedance model, and a DC system impedance model. The second construction module is configured to select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure. The solution module is configured to construct a wideband multi-objective optimization function based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function, and to solve it in the parameter space using an optimization algorithm. The wideband multi-objective optimization function is used as the fitness function to obtain the candidate optimal solution of the amplitude and phase corrector parameters. The judgment module is configured to substitute the candidate optimal solution into the impedance model of the flexible DC transmission system for parameter verification and determine whether the preset wideband oscillation suppression condition is met. The optimization module is configured to output the candidate optimal solution as the optimal amplitude-phase corrector parameter if the broadband oscillation suppression condition is met; otherwise, it will re-optimize and verify until the parameter that meets the broadband oscillation suppression condition is obtained.

[0007] Thirdly, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the steps of the amplitude-phase corrector parameter design method of any embodiment of the present invention.

[0008] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor performs the steps of the amplitude and phase corrector parameter design method according to any embodiment of the present invention.

[0009] The amplitude and phase corrector parameter design method and system of this application, by constructing a multi-objective optimization function integrating four core indicators—impedance amplitude matching, phase characteristic optimization, oscillation mode damping enhancement, and resonance peak suppression—and employing an intelligent optimization algorithm for automated parameter solving and closed-loop verification, achieves a fundamental shift from "experience-driven" to "model and optimization-driven" approaches. This method and system effectively solve the prominent defects of traditional methods, such as low parameter tuning efficiency and one-sided parameter configuration. It can quickly and accurately obtain globally optimal or near-optimal parameter combinations over a wide frequency range, which not only significantly improves the efficiency and engineering applicability of parameter design, but also ensures smooth impedance characteristics, sufficient stability margin, and effective oscillation damping of the flexible DC system across the entire frequency band through the synergistic optimization of multi-dimensional performance indicators. This significantly improves the reliability and robustness of the system in suppressing broadband oscillations, providing key technical support for the safe and stable operation and large-scale application of flexible DC transmission systems. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A flowchart illustrating a method for designing amplitude and phase corrector parameters according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a dual-capacitor-dual-inductor amplitude-phase corrector structure provided in an embodiment of the present invention; Figure 3 A structural block diagram of an amplitude and phase corrector parameter design system provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0013] Please see Figure 1 The diagram shows a flowchart of a method for designing amplitude and phase corrector parameters according to this application.

[0014] like Figure 1 As shown, the parameter design method for the amplitude and phase corrector specifically includes the following steps: Step S101: Construct an impedance model for the flexible DC transmission system. The impedance model for the flexible DC transmission system includes an AC system impedance model, a converter impedance model, and a DC system impedance model.

[0015] In this step, the expression for the impedance model of the AC system is: , In the formula, The equivalent impedance of the AC-side system in the frequency domain. The impedance value in the frequency domain. The current operating frequency of the system. The resistive component of the equivalent impedance on the AC side. The resistive component of the equivalent impedance on the AC side. The capacitive component of the equivalent impedance on the AC side; The expression for the converter impedance model is as follows: , , , , In the formula, This is the equivalent impedance of the converter in the frequency domain. The equivalent impedance of the converter's electrical components in the frequency domain. This is the equivalent resistance value of the electrical components. This is the equivalent inductance value of the electrical components. The additional equivalent impedance introduced by the phase-locked loop inside the converter. This represents the equivalent resistance at different frequencies under the action of the phase-locked loop inside the converter. The equivalent inductance under the action of the phase-locked loop inside the converter. The additional equivalent negative impedance introduced by the negative feedback voltage injected into the port by the internal current loop of the converter. This is the equivalent negative resistance generated by the proportional element of the current loop. This is the equivalent negative inductance generated by the current loop integral stage; The expression for the DC system impedance model is as follows: , In the formula, Z dc ( jω () represents the equivalent impedance of the DC-side line in the frequency domain. The resistive component of the DC-side equivalent impedance. The inductive component of the DC-side equivalent impedance. The capacitive component of the DC-side equivalent impedance; The expression for the impedance model of the flexible DC transmission system is as follows: , In the formula, Zsys(jω) is the equivalent impedance of the flexible DC transmission system.

[0016] Step S102: Select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure.

[0017] In this step, the amplitude-phase corrector structure is a dual-capacitor-dual-inductor type structure. The parameter space is composed of the range of values ​​for capacitance, inductance, and resistance in the dual-capacitor-dual-inductor type structure. The expression for the parameter space is: , In the formula, For the amplitude and phase corrector parameter space, This is the first capacitor in the amplitude-phase corrector. The first inductor in the amplitude-phase corrector, The second inductor in the amplitude-phase corrector, This is the second capacitor in the amplitude-phase corrector. This is the first resistor in the amplitude-phase corrector.

[0018] Taking the dual-capacitor-dual-inductor amplitude-phase corrector structure as an example, such as Figure 2 As shown, the equivalent impedance model of the AC side bus amplitude-phase corrector can be expressed as: , In the formula, The equivalent impedance of the AC bus amplitude-phase corrector. This is the equivalent impedance corresponding to the first capacitor in the amplitude-phase corrector. This is the equivalent impedance corresponding to the first inductor in the amplitude-phase corrector. This is the equivalent resistance corresponding to the first resistor in the amplitude-phase corrector. This is the equivalent parallel impedance of the second inductor and the second capacitor in the amplitude-phase corrector.

[0019] Step S103: Construct a wideband multi-objective optimization function based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function, and solve it in the parameter space using an optimization algorithm. Use the wideband multi-objective optimization function as the fitness function to obtain the candidate optimal solution of the amplitude and phase corrector parameters.

[0020] In this step, the expression for the impedance magnitude error function is: , In the formula, This is the impedance magnitude error function. The current operating frequency of the system. To the current system operating frequency The weighting coefficients below, The impedance value in the frequency domain. To the current system operating frequency The impedance of the amplitude and phase corrector is below. To the current system operating frequency The impedance reference value below; The expression for the impedance phase error function is: , In the formula, This is the impedance phase error function. The phase of the equivalent impedance of the amplitude-phase compensator at the current system operating frequency. The equivalent impedance phase of the flexible DC system at the current system operating frequency; The expression for the oscillating mode damping function is:

[0021] In the formula, Let be the damping function of the oscillation mode. This represents the impedance of a flexible DC system with an amplitude-phase corrector installed. Represents the function that takes the real part of a complex number. It represents the derivative with respect to frequency, and band is the frequency range of the system; The expression for the resonance suppression function is: , In the formula, This is the resonance peak suppression function. For the impedance of a flexible DC system with an amplitude-phase corrector installed, Indicates in The maximum impedance value of the flexible DC system with an amplitude-phase corrector installed below; The expression for the wideband multi-objective optimization function is: , In the formula, For wideband multi-objective optimization functions, These are the weighting coefficients for the impedance magnitude error function. These are the weighting coefficients for the impedance phase error function. These are the weighting coefficients of the oscillation mode damping function. represents the weighting coefficients of the formant suppression function.

[0022] Specifically, a particle swarm optimization algorithm is used to solve for the parameters in the amplitude-phase corrector parameter space. The number of particles and the particle dimension are initialized to be consistent with the parameter space dimension, and the global optimum is updated using a wideband multi-objective optimization function as the fitness function.

[0023] Step S104: Substitute the candidate optimal solution into the impedance model of the flexible DC transmission system for parameter verification to determine whether the preset broadband oscillation suppression condition is met.

[0024] In this step, the optimal parameters are substituted into the impedance model of the flexible DC transmission system to verify whether the broadband impedance satisfies the requirements of no local abrupt changes, moderate margin and no resonance peak, and whether the damping ratio is higher than the limit.

[0025] Specifically, the following parameters are obtained: local abrupt change discrimination index, system phase margin, system amplitude margin, resonance peak suppression discrimination index, and system damping ratio. The local abrupt change discrimination index is the local peak-to-neighbor ratio, expressed as: , In the formula, For local peak-to-neighbor ratio, The frequency corresponding to the peak impedance. for The average of the three step sizes, left and right. for The corresponding peak impedance; The resonance peak suppression discrimination index is the peak suppression amount, expressed as: , , In the formula, This is the resonance peak value. The local peak impedance before optimizing the amplitude and phase compensator parameters. To optimize the local peak impedance after adjusting the amplitude and phase compensator parameters, For the impedance of a flexible DC system with an amplitude-phase corrector installed, This represents the maximum equivalent impedance value within the frequency band. Determine whether the local mutation discrimination index, the system phase margin, the system amplitude margin, the resonance peak suppression discrimination index, and the system damping ratio satisfy the corresponding broadband oscillation suppression conditions.

[0026] If the local peak-to-adjacent ratio PTN ≤ 3dB, then no local abrupt change has occurred in the system; If the system phase margin PM ≥ 35° and the system amplitude margin GM ≥ 6dB, then the margin is considered moderate. If the resonance peak If the value is ≥3dB, then the requirement is met; If the system damping ratio If the value is ≥0.07, then the requirement is met.

[0027] Step S105: If the broadband oscillation suppression condition is met, the candidate optimal solution is output as the optimal amplitude-phase corrector parameter. If not, the optimization and verification are repeated until the parameter that meets the broadband oscillation suppression condition is obtained.

[0028] In summary, the method presented in this application, by constructing a multi-objective optimization function integrating four core indicators—impedance amplitude matching, phase characteristic optimization, oscillation mode damping enhancement, and resonance peak suppression—and employing an intelligent optimization algorithm for automated parameter solving and closed-loop verification, achieves a fundamental shift from "experience-driven" to "model and optimization-driven" approaches. This method and system effectively address the prominent shortcomings of traditional methods, such as low parameter tuning efficiency and one-sided parameter configuration. It can quickly and accurately obtain globally optimal or near-optimal parameter combinations over a wide frequency range, significantly improving the efficiency and engineering applicability of parameter design. Furthermore, through the synergistic optimization of multi-dimensional performance indicators, it ensures smooth impedance characteristics, sufficient stability margin, and effective oscillation damping across the entire frequency band of the flexible DC transmission system. This significantly enhances the reliability and robustness of the system in suppressing wideband oscillations, providing crucial technical support for the safe and stable operation and large-scale application of flexible DC transmission systems.

[0029] Please see Figure 3 The diagram shows a structural block diagram of an amplitude and phase corrector parameter design system according to this application.

[0030] like Figure 3 As shown, the amplitude and phase corrector parameter design system 200 includes a first construction module 210, a second construction module 220, a solution module 230, a judgment module 240, and an optimization module 250.

[0031] The first construction module 210 is configured to construct an impedance model of a flexible DC transmission system, which includes an AC system impedance model, a converter impedance model, and a DC system impedance model. The second construction module 220 is configured to select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure. The solution module 230 is configured to construct a wideband multi-objective optimization function based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function. An optimization algorithm is employed to solve the parameter space, using the wideband multi-objective optimization function as the fitness function, to obtain candidate optimal solutions for the amplitude-phase corrector parameters. A judgment module 240 is configured to substitute the candidate optimal solutions into the impedance model of the flexible DC transmission system for parameter verification, determining whether the preset wideband oscillation suppression condition is met. An optimization module 250 is configured to output the candidate optimal solution as the optimal amplitude-phase corrector parameters if the wideband oscillation suppression condition is met; otherwise, it re-optimizes and verifies until parameters satisfying the wideband oscillation suppression condition are obtained.

[0032] It should be understood that Figure 3 The modules and references described in the document Figure 1 The steps described in the text correspond to those in the method described above. Therefore, the operations, features, and corresponding technical effects described above also apply to the method described in the text. Figure 3 The various modules in the document will not be described in detail here.

[0033] In other embodiments, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor performs the amplitude-phase corrector parameter design method in any of the above method embodiments. In one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions, which are configured as follows: An impedance model for a flexible DC transmission system is constructed, comprising an AC system impedance model, a converter impedance model, and a DC system impedance model. Select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure; A wideband multi-objective optimization function is constructed based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function. An optimization algorithm is used to solve the problem in the parameter space. The candidate optimal solution of the amplitude and phase corrector parameters is obtained by using the wideband multi-objective optimization function as the fitness function. The candidate optimal solution is substituted into the impedance model of the flexible DC transmission system for parameter verification to determine whether it meets the preset wideband oscillation suppression condition. If the broadband oscillation suppression condition is met, the candidate optimal solution is output as the optimal amplitude-phase corrector parameter. If not, the optimization and verification are repeated until the parameter that meets the broadband oscillation suppression condition is obtained.

[0034] Computer-readable storage media may include a stored program area and a stored data area, wherein the stored program area may store an operating system and an application program required for at least one function; the stored data area may store data created during the use of the amplitude-phase corrector parameter design system, etc. Furthermore, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include memory remotely located relative to a processor, and these remote memories may be connected to the amplitude-phase corrector parameter design system via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0035] Figure 4 This is a schematic diagram of the structure of the electronic device provided in the embodiment of the present invention, such as... Figure 4 As shown, the device includes a processor 310 and a memory 320. The electronic device may also include an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 can be connected via a bus or other means. Figure 4 Taking a bus connection as an example, the memory 320 is the computer-readable storage medium described above. The processor 310 executes various server functions and data processing by running non-volatile software programs, instructions, and modules stored in the memory 320, thereby implementing the amplitude and phase corrector parameter design method described in the above embodiment. The input device 330 can receive input digital or character information and generate key signal inputs related to user settings and function control of the amplitude and phase corrector parameter design system. The output device 340 may include a display screen or other display device.

[0036] The aforementioned electronic device can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0037] In one implementation, the above-described electronic device is applied in an amplitude and phase corrector parameter design system for a client, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: An impedance model for a flexible DC transmission system is constructed, comprising an AC system impedance model, a converter impedance model, and a DC system impedance model. Select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure; A wideband multi-objective optimization function is constructed based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function. An optimization algorithm is used to solve the problem in the parameter space. The candidate optimal solution of the amplitude and phase corrector parameters is obtained by using the wideband multi-objective optimization function as the fitness function. The candidate optimal solution is substituted into the impedance model of the flexible DC transmission system for parameter verification to determine whether it meets the preset wideband oscillation suppression condition. If the broadband oscillation suppression condition is met, the candidate optimal solution is output as the optimal amplitude-phase corrector parameter. If not, the optimization and verification are repeated until the parameter that meets the broadband oscillation suppression condition is obtained.

[0038] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing parameters of an amplitude-phase corrector, characterized in that, include: An impedance model for a flexible DC transmission system is constructed, comprising an AC system impedance model, a converter impedance model, and a DC system impedance model. Select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure; A wideband multi-objective optimization function is constructed based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function. An optimization algorithm is used to solve the problem in the parameter space. The candidate optimal solution of the amplitude and phase corrector parameters is obtained by using the wideband multi-objective optimization function as the fitness function. The candidate optimal solution is substituted into the impedance model of the flexible DC transmission system for parameter verification to determine whether it meets the preset wideband oscillation suppression condition. If the broadband oscillation suppression condition is met, the candidate optimal solution is output as the optimal amplitude-phase corrector parameter. If not, the optimization and verification are repeated until the parameter that meets the broadband oscillation suppression condition is obtained.

2. The method for designing amplitude and phase corrector parameters according to claim 1, characterized in that, The expression for the impedance model of the AC system is: ， In the formula, The equivalent impedance of the AC-side system in the frequency domain. The impedance value in the frequency domain. The current operating frequency of the system. The resistive component of the equivalent impedance on the AC side. The resistive component of the equivalent impedance on the AC side. The capacitive component of the equivalent impedance on the AC side; The expression for the converter impedance model is as follows: ， ， , , In the formula, This is the equivalent impedance of the converter in the frequency domain. The equivalent impedance of the converter's electrical components in the frequency domain. This is the equivalent resistance value of the electrical components. This is the equivalent inductance value of the electrical components. The additional equivalent impedance introduced by the phase-locked loop inside the converter. This represents the equivalent resistance at different frequencies under the action of the phase-locked loop inside the converter. The equivalent inductance under the action of the phase-locked loop inside the converter. The additional equivalent negative impedance introduced by the negative feedback voltage injected into the port by the internal current loop of the converter. This is the equivalent negative resistance generated by the proportional element of the current loop. This is the equivalent negative inductance generated by the current loop integral stage; The expression for the DC system impedance model is as follows: ， In the formula, Z dc ( jω () represents the equivalent impedance of the DC-side line in the frequency domain. The resistive component of the DC-side equivalent impedance. The inductive component of the DC-side equivalent impedance. The capacitive component of the DC-side equivalent impedance; The expression for the impedance model of the flexible DC transmission system is as follows: ， In the formula, Zsys(jω) is the equivalent impedance of the flexible DC transmission system.

3. The amplitude and phase corrector parameter design method according to claim 1, characterized in that, The amplitude-phase corrector structure is a dual-capacitor-dual-inductor type structure. The parameter space is composed of the range of values ​​for capacitance, inductance, and resistance in the dual-capacitor-dual-inductor structure. The expression for the parameter space is: ， In the formula, For the amplitude and phase corrector parameter space, This is the first capacitor in the amplitude-phase corrector. The first inductor in the amplitude-phase corrector, The second inductor in the amplitude-phase corrector, This is the second capacitor in the amplitude-phase corrector. This is the first resistor in the amplitude-phase corrector.

4. The amplitude and phase corrector parameter design method according to claim 1, characterized in that, The expression for the impedance magnitude error function is: ， In the formula, This is the impedance magnitude error function. The current operating frequency of the system. To the current system operating frequency The weighting coefficients below, The impedance value in the frequency domain. To the current system operating frequency The impedance of the amplitude and phase corrector is below. To the current system operating frequency The impedance reference value below; The expression for the impedance phase error function is: ， In the formula, This is the impedance phase error function. The phase of the equivalent impedance of the amplitude-phase compensator at the current system operating frequency. The equivalent impedance phase of the flexible DC system at the current system operating frequency; The expression for the oscillation mode damping function is: ， In the formula, Let be the damping function of the oscillation mode. This represents the impedance of a flexible DC system with an amplitude-phase corrector installed. Represents the function that takes the real part of a complex number. It represents the derivative with respect to frequency, and band is the frequency range of the system; The expression for the resonance peak suppression function is: ， In the formula, This is the resonance peak suppression function. For the impedance of a flexible DC system with an amplitude-phase corrector installed, Indicates in The maximum impedance value of the flexible DC system with an amplitude-phase corrector installed below; The expression for the wideband multi-objective optimization function is: ， In the formula, For wideband multi-objective optimization functions, These are the weighting coefficients for the impedance magnitude error function. These are the weighting coefficients for the impedance phase error function. These are the weighting coefficients of the oscillation mode damping function. represents the weighting coefficients of the formant suppression function.

5. The method for designing amplitude and phase corrector parameters according to claim 1, characterized in that, The step of substituting the candidate optimal solution into the impedance model of the flexible DC transmission system for parameter verification, and determining whether the preset broadband oscillation suppression condition is met, includes: Obtain the local abrupt change discrimination index, system phase margin, system amplitude margin, resonance peak suppression discrimination index, and system damping ratio. The local abrupt change discrimination index is the local peak-to-neighbor ratio, expressed as: ， In the formula, For local peak-to-neighbor ratio, The frequency corresponding to the peak impedance. for The average of the three step sizes, left and right. for The corresponding peak impedance; The resonance peak suppression discrimination index is the peak suppression amount, expressed as: ， ， In the formula, The resonance peak value, The local peak impedance before optimizing the amplitude and phase compensator parameters. To optimize the local peak impedance after adjusting the amplitude and phase compensator parameters, For the impedance of a flexible DC system with an amplitude-phase corrector installed, This represents the maximum equivalent impedance value within the frequency range band. Determine whether the local mutation discrimination index, the system phase margin, the system amplitude margin, the resonance peak suppression discrimination index, and the system damping ratio satisfy the corresponding broadband oscillation suppression conditions.

6. A parameter design system for an amplitude and phase corrector, characterized in that, include: The first construction module is configured to construct an impedance model of a flexible DC transmission system, which includes an AC system impedance model, a converter impedance model, and a DC system impedance model. The second construction module is configured to select an amplitude-phase corrector structure and construct a parameter space containing the component parameters of the amplitude-phase corrector structure based on the amplitude-phase corrector structure. The solution module is configured to construct a wideband multi-objective optimization function based on the impedance amplitude error function, impedance phase error function, oscillation mode damping function, and resonance peak suppression function, and to solve it in the parameter space using an optimization algorithm. The wideband multi-objective optimization function is used as the fitness function to obtain the candidate optimal solution of the amplitude and phase corrector parameters. The judgment module is configured to substitute the candidate optimal solution into the impedance model of the flexible DC transmission system for parameter verification and determine whether the preset wideband oscillation suppression condition is met. The optimization module is configured to output the candidate optimal solution as the optimal amplitude-phase corrector parameter if the broadband oscillation suppression condition is met; otherwise, it will re-optimize and verify until the parameter that meets the broadband oscillation suppression condition is obtained.

7. An electronic device, characterized in that, include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method described in any one of claims 1 to 5.

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