Additional damping strategy and parameter setting method based on matching control type network construction converter

Abstract

The invention provides an additional damping strategy and parameter setting method based on a matching control type network construction converter, and belongs to the technical field of power grid matching control, and the method comprises the steps: determining circuit parameters, and calculating a power angle coefficient and a power base value through the circuit parameters; based on the power angle coefficient and the power base value, constructing an active-frequency response model added with damping matching control; solving a damping ratio expression and a natural oscillation frequency expression by using the active-frequency response model; based on preset constraint conditions, a damping ratio expression and a natural oscillation frequency expression are utilized to determine control parameters in an active-frequency response model, a damping link is added in mechanism control, and a new transfer function model is obtained, so that the problem of low-frequency oscillation is effectively relieved, and the reliability of the system is improved. And the value of a control parameter can be calculated through parameter setting, so that a response curve conforms to a given damping ratio and natural oscillation angular frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid matching control, and in particular to an additional damping strategy and parameter setting method for a matching control type grid-connected converter. Background Art

[0002] Driven by the strategic goal of "carbon peak and carbon neutrality", the pace of energy transformation has accelerated significantly, and the proportion of new energy in the power system has increased. But at the same time, the low inertia and weak damping characteristics of new energy pose a severe challenge to the stable operation of the power system. In order to cope with the above-mentioned difficulties caused by the large-scale grid connection of new energy, domestic and foreign research teams have proposed a grid-forming control strategy, which aims to enable the converter to actively intervene in the regulation process of the power grid. According to the specific implementation methods, the grid-forming control strategy can be subdivided into droop control, virtual synchronous generator (VSG) control, and DC voltage matching control.

[0003] Both droop control and VSG control take output power as the control object, so a stable DC voltage is required as a prerequisite. Moreover, the "demand" and "source" of power have not been effectively unified. Therefore, based on the similarity and duality of the structure and characteristics of the converter and the synchronous machine, the matching relationship between the converter DC capacitor voltage and the synchronous machine rotor speed is established, and the converter DC bus capacitor energy is used to simulate the synchronous machine rotor energy, so as to realize the converter phase angle generation link and then achieve grid connection. This control is called DC voltage synchronization control strategy, that is, matching control. Compared with droop control and VSG control, matching control only needs to track and measure the voltage of the DC bus to achieve grid-forming control, which is more intuitive and flexible, and has high applicability for new energy without energy storage to access the grid in a grid-forming manner.

[0004] However, in traditional matching control, the characteristics of the DC capacitor simulate the "inertia" of the synchronous generator rotor, but the damping of the rotor itself cannot be simulated, which also makes this control scheme prone to unstable low-frequency oscillations. Summary of the invention

[0005] The present invention provides an additional damping strategy and parameter setting method for a matching control type grid-connected converter, which are used to solve the defect that the matching control in the prior art easily causes low-frequency oscillation.

[0006] In a first aspect, the present invention provides an additional damping strategy and parameter setting method for a matching control type grid-connected converter, comprising: Determine circuit parameters, and calculate the power angle factor and power base value through the circuit parameters; Based on the power angle coefficient and the power base value, construct an active power-frequency response model of matching control with damping added; Using the active power-frequency response model, solving the damping ratio expression and the natural oscillation frequency expression; Based on preset constraints, the control parameters in the active power-frequency response model are determined using the damping ratio expression and the natural oscillation frequency expression.

[0007] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, the circuit parameters are determined including: A proportional link is added to the phase angle generation link of the circuit to obtain a matching control circuit of the additional damping link; Based on the power angle relationship of the grid-side converter output, the circuit parameters of the matching control circuit of the additional damping link are determined, including: the grid-side converter output voltage amplitude, the grid access point voltage amplitude and the line impedance between the two points.

[0008] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, the power angle coefficient is calculated by the circuit parameters, including: Determine the product of the output voltage amplitude of the grid-side converter and the voltage amplitude of the grid access point; The ratio of the product to the line impedance between the two points is used as the power angle coefficient.

[0009] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, based on the power angle coefficient and the power base value, an active power-frequency response model of matching control with damping is constructed, including: Determine the power relationship across the DC bus; In combination with the power relationship, the power angle coefficient and the power base value, a small signal analysis method is used to obtain an active power-frequency response model of matching control with an additional damping link.

[0010] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, the active power-frequency response model of the matching control with an additional damping link obtained by using a small signal analysis method includes: Determine the angular frequency of the grid connection point, the grid-side converter and the initial voltage phase of the grid connection point; The power angle coefficient, the power base value, the angular frequency of the grid connection point, and the initial voltage phases of the grid-side converter and the grid connection point are input into the transfer function model to obtain an active power-frequency response model of matching control with an additional damping link added.

[0011] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, the active power-frequency response model is: ; in, k p represents the power angle coefficient, oh B Indicates the power base value, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, s represents the Laplace operator, and C represents the DC capacitance.

[0012] According to an additional damping strategy and parameter setting method for a matching control type grid-connected converter provided by the present invention, the active power-frequency response model is used to solve the damping ratio expression and the natural oscillation frequency expression, including: Based on the active power-frequency response model and the second-order transfer function characteristics, the damping ratio expression and the natural oscillation frequency expression are obtained.

[0013] According to an additional damping strategy and parameter setting method for a matching-controlled grid-connected converter provided by the present invention, the control parameters include: a DC voltage matching coefficient and a damping coefficient; The determining of the control parameters in the active power-frequency response model comprises: ; in, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, C represents the DC capacitance, oh n represents the natural oscillation angular frequency, k p represents the power angle coefficient, oh B Indicates the power base value, g Represents the damping ratio.

[0014] In a second aspect, the present invention further provides an additional damping strategy and parameter setting device for a matching control type grid-connected converter, comprising: A determination module, used to determine circuit parameters, and calculate the power angle coefficient and power base value through the circuit parameters; A construction module, configured to construct an active power-frequency response model of matching control with damping added based on the power angle coefficient and the power base value; A solution module, used for solving a damping ratio expression and a natural oscillation frequency expression by using the active power-frequency response model; A setting module is used to determine the control parameters in the active power-frequency response model based on preset constraints and using the damping ratio expression and the natural oscillation frequency expression.

[0015] In a third aspect, the present invention further provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements any of the above-described additional damping strategies and parameter setting methods for matching control-type grid-connected converters.

[0016] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described additional damping strategies and parameter setting methods for matching control-type grid-connected converters.

[0017] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned additional damping strategies and parameter setting methods for a matching control-type grid-connected converter.

[0018] The present invention provides an additional damping strategy and parameter setting method for a matching control type grid-connected converter, comprising: determining circuit parameters, and calculating a power angle coefficient and a power base value through the circuit parameters; constructing an active-frequency response model of a matching control with damping added based on the power angle coefficient and the power base value; solving a damping ratio expression and a natural oscillation frequency expression using the active-frequency response model; determining control parameters in the active-frequency response model based on preset constraints using the damping ratio expression and the natural oscillation frequency expression. Since a damping link is added to the mechanism control and a new transfer function model is obtained, the low-frequency oscillation problem is effectively alleviated, and the value of the control parameter can be calculated through parameter setting so that the response curve meets the given damping ratio and natural oscillation angle frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of an additional damping strategy and parameter setting method of a matching control type grid-connected converter provided in this embodiment; Figure 2 is a block diagram of the matching control structure of the additional damping link provided in this embodiment; Figure 3 This embodiment provides Figure 2 The PI controller structure diagram in; Figure 4 This embodiment provides oh n =5rad / s, g =0.3 step response diagram for the test; Figure 5 This embodiment provides oh n =5rad / s, g =0.707 Step response diagram during the test; Figure 6 It is a structural schematic diagram of an additional damping strategy and a parameter setting device for a matching control type grid-connected converter provided in this embodiment; Figure 7 It is a schematic diagram of the structure of the electronic device provided in this embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Figure 1 It is a flow chart of the additional damping strategy and parameter setting method of the matching control type grid-connected converter provided in this embodiment.

[0023] like Figure 1 As shown, the additional damping strategy and parameter setting method of the matching control type grid-connected converter provided by the embodiment of the present invention mainly include the following steps: 101. Determine the circuit parameters and calculate the power angle coefficient and power base value through the circuit parameters.

[0024] In a specific implementation process, when the frequency changes, it is easy to cause low-frequency oscillation of the active response. Therefore, a proportional link is added to the phase angle generation link, so that the phase angle generation process changes to (1): (1) in, and Output phase angle of grid-side converter The two components of . K δ is the damping coefficient, oh BIndicates the power base value, oh is the actual output angular frequency of the converter, i.e. the controlled object, and s represents the Laplace operator, which is used as an additional damping link for matching control.

[0025] The improved control structure diagram is as follows: Figure 2 As shown, V dc is the actual value of the DC bus voltage, V dc_ref are the reference values ​​of the DC bus voltage, all are per unit values. K c is the DC voltage matching coefficient, oh 0 is the reference value of angular frequency, oh It is the actual output angular frequency of the converter, i.e. the controlled object.

[0026] The structure of the PI controller is as follows Figure 3 As shown, therefore, an additional damping link is added to the matching control. Based on the power angle relationship of the grid-side converter output, the circuit parameters of the matching control circuit of the additional damping link can be determined, including: the output voltage amplitude of the grid-side converter E out , Voltage amplitude at the grid access point U g and the line impedance between the two points X d wait.

[0027] The power angle coefficient is then calculated using the circuit parameters, including: determining the product of the output voltage amplitude of the grid-side converter and the voltage amplitude at the grid access point; and taking the ratio of the product to the line impedance between the two points as the power angle coefficient, such as (2): k p = (2) in, E out Indicates the output voltage amplitude of the grid-side converter, U g Indicates the voltage amplitude at the grid access point, X d Indicates the line impedance between two points. Power base value oh B Take 100π rad / s, and the calculation method is oh B =2π f B , f B The grid base frequency is 50Hz.

[0028] 102. Based on the power angle coefficient and power base value, an active power-frequency response model of matching control with damping is constructed.

[0029] According to the matching control of the additional damping link and the circuit relationship, a small signal model can be constructed to analyze its active response mechanism. The specific steps are as follows: The power relationship between the two ends of the DC bus is (3): (3) Where C represents the DC capacitance, V dc Indicates the actual value of the DC bus voltage, P m Output active power for the machine-side converter, P e Input active power to the grid-side converter, is the current flowing through the DC capacitor, This is the power on the capacitor. The fluctuation range is very small, but the fluctuation speed is high, so it can be approximated as a constant, but its differential is regarded as a variable. The Laplace transform yields (4): (4) Considering the power angle relationship of the grid-side converter output (5): (5) in, E out is the output voltage amplitude of the grid-side converter, U g is the voltage amplitude at the grid access point, X d is the line impedance between two points, d is the grid-side converter output phase, i is the grid voltage phase. All are per unit values.

[0030] Will Written as a constant k p , recorded as the power angle coefficient.

[0031] The small signal analysis method is used for equation (5) to obtain the small signal model of matching control with additional damping link, as shown in (6): (6) in, oh g is the angular frequency of the grid connection point, and are the initial voltage phases of the grid-side converter and the grid connection point respectively. Simplify the above formula, let , and then rearrange equation (6). The active power-frequency response model is obtained, as shown in (7): (7) in, k p represents the power angle coefficient, oh B Indicates the power base value, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, s represents the Laplace operator, and C represents the DC capacitance.

[0032] 103. Use the active-frequency response model to solve the damping ratio expression and the natural oscillation frequency expression.

[0033] Parameter adjustment is performed based on matching control with an additional damping link. It is assumed that when the grid frequency changes, the natural oscillation angular frequency is oh n , damping ratio g To be within a certain range, the control parameter setting process is as follows (8): (8) By comparing equations (7) and (8), we can get that the matched control transfer function with added damping is the classic second-order transfer function with a differential link added. Based on the active-frequency response model and the characteristics of the second-order transfer function, we can get the damping ratio expression and the natural oscillation frequency expression (9): (9) in, k p is the power angle coefficient, K c is the DC voltage matching coefficient, oh B is the power base value, K δ is the damping coefficient, C represents the DC capacitance, oh n is the natural oscillation angular frequency, g is the damping ratio.

[0034] 104. Based on the preset constraints, the control parameters in the active power-frequency response model are determined using the damping ratio expression and the natural oscillation frequency expression.

[0035] Combined with the constraints including the given natural oscillation angular frequency and damping ratio, (9) is transformed to obtain the control parameters in the active-frequency response model: K c and Kδ , such as (10): (10) in, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, C represents the DC capacitance, oh n represents the natural oscillation angular frequency, k p represents the power angle coefficient, oh B Indicates the power base value, g Represents the damping ratio.

[0036] For the parameters in the above formula (10), the power angle coefficient k p From the circuit parameters: E out , U g , X d Joint decision, oh B is the power base value, taking 100π rad / s, and its calculation method is oh B =2π f B , f B is the grid reference frequency 50Hz. C is the DC capacitance, both are known quantities, so the control parameters are K c and K δ Only by oh n and g Decide. Determine oh n and g The value of the control parameter can be calculated.

[0037] By analyzing the matching control mechanism, adding a damping link and obtaining a new transfer function, namely the active-frequency response model, the low-frequency oscillation problem is effectively alleviated. And through parameter setting, the value of the control parameter can be accurately calculated so that the response curve conforms to the given damping ratio and natural oscillation angular frequency.

[0038] In order to verify the effect of the solution of the present invention, a step input is added to the transfer function, and the actual step response is compared with the theoretically calculated value. The values ​​of some parameters are shown in Table 1:

[0039] Table 1 First, we calculate the line parameters k p =3.33, and determine oh B =100π, add damping element ， The active power-frequency transfer function of the matching control can be obtained as (11): (11) If active response is required, the natural oscillation angular frequency oh n At 5-10rad / s, the damping ratio g In the range of 0.3-1, according to the flow chart, the calculation can be obtained: K c The range is 0.006877~0.0275, K δ The range is 9.4255~251.27, which means the parameter setting is completed.

[0040] Select oh n =5rad / s, damping ratio g =0.3 as an example, we can calculate K c is 0.006877, K δ is 37.7, and the response curve is as follows: Figure 4 shown.

[0041] from Figure 4 It can be seen that the time difference between the two peaks is about 1.3s, that is, T≈1.3s. Theoretical calculations give the damped oscillation angular frequency 4.7697rad / s, then f d = =0.759Hz, T=1 / f d =1.317s, proving the correctness of the theoretical calculation.

[0042] If selected oh n is 5rad / s, the damping ratio ζ 0.707, we can calculate K c is 0.006877, K δ is 88.8, such as Figure 5 shown.

[0043] Similarly, through theoretical calculation, we can get T=1.76, which is the same as Figure 5 The results confirmed each other.

[0044] Based on the same general inventive concept, the present invention also protects an additional damping strategy and parameter setting device based on a matching control type grid-connected converter. The additional damping strategy and parameter setting device based on a matching control type grid-connected converter described below and the additional damping strategy and parameter setting method based on a matching control type grid-connected converter described above can be referenced to each other.

[0045] Figure 6 It is a structural schematic diagram of the additional damping strategy and parameter setting device of the matching control type grid-connected converter provided in this embodiment.

[0046] like Figure 6 As shown, this embodiment provides an additional damping strategy and parameter setting device for a matching control type grid-connected converter, including: A determination module 601 is used to determine circuit parameters and calculate the power angle coefficient and power base value through the circuit parameters; A construction module 602 is used to construct an active power-frequency response model of matching control with damping added based on the power angle coefficient and the power base value; A solution module 603 is used to solve the damping ratio expression and the natural oscillation frequency expression by using the active power-frequency response model; The setting module 604 is used to determine the control parameters in the active power-frequency response model based on preset constraints and using the damping ratio expression and the natural oscillation frequency expression.

[0047] Figure 7 It is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0048] like Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute the additional damping strategy and parameter setting method of the grid-connected converter based on the matching control type, the method comprising: determining the circuit parameters, and calculating the power angle coefficient and the power base value through the circuit parameters; constructing an active-frequency response model of the matching control with damping added based on the power angle coefficient and the power base value; solving the damping ratio expression and the natural oscillation frequency expression by using the active-frequency response model; determining the control parameters in the active-frequency response model by using the damping ratio expression and the natural oscillation frequency expression based on the preset constraints.

[0049] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0050] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the additional damping strategy and parameter setting method of the matching control type grid-connected converter provided by the above-mentioned methods. The method includes: determining circuit parameters, and calculating the power angle coefficient and the power base value through the circuit parameters; based on the power angle coefficient and the power base value, constructing an active-frequency response model of matching control with damping added; using the active-frequency response model, solving the damping ratio expression and the natural oscillation frequency expression; based on preset constraints, using the damping ratio expression and the natural oscillation frequency expression, determining the control parameters in the active-frequency response model.

[0051] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the additional damping strategy and parameter setting method of the matching control type grid-connected converter provided by the above-mentioned methods, the method comprising: determining circuit parameters, and calculating the power angle coefficient and the power base value through the circuit parameters; constructing an active-frequency response model of matching control with damping added based on the power angle coefficient and the power base value; using the active-frequency response model, solving the damping ratio expression and the natural oscillation frequency expression; based on preset constraints, using the damping ratio expression and the natural oscillation frequency expression, determining the control parameters in the active-frequency response model.

[0052] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0053] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An additional damping strategy and parameter setting method for a matching control type grid-connected converter, characterized in that: include: Determine circuit parameters, and calculate the power angle factor and power base value through the circuit parameters; Based on the power angle coefficient and the power base value, construct an active power-frequency response model of matching control with damping added; Using the active power-frequency response model, solving the damping ratio expression and the natural oscillation frequency expression; Based on preset constraints, the control parameters in the active power-frequency response model are determined using the damping ratio expression and the natural oscillation frequency expression.

2. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 1 is characterized in that: Determining the circuit parameters comprises: A proportional link is added to the phase angle generation link of the circuit to obtain a matching control circuit of the additional damping link; Based on the power angle relationship of the grid-side converter output, the circuit parameters of the matching control circuit of the additional damping link are determined, including: the grid-side converter output voltage amplitude, the grid access point voltage amplitude and the line impedance between the two points.

3. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 2 is characterized in that: The step of calculating the power angle coefficient by using the circuit parameters comprises: Determine the product of the output voltage amplitude of the grid-side converter and the voltage amplitude of the grid access point; The ratio of the product to the line impedance between the two points is used as the power angle coefficient.

4. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 1 is characterized in that: The constructing of an active power-frequency response model of matching control with damping based on the power angle coefficient and the power base value comprises: Determine the power relationship across the DC bus; In combination with the power relationship, the power angle coefficient and the power base value, a small signal analysis method is used to obtain an active power-frequency response model of matching control with an additional damping link.

5. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 4 is characterized in that: The active power-frequency response model of the matching control with the additional damping link obtained by using the small signal analysis method includes: Determine the angular frequency of the grid connection point, the grid-side converter and the initial voltage phase of the grid connection point; The power angle coefficient, the power base value, the angular frequency of the grid connection point, and the initial voltage phases of the grid-side converter and the grid connection point are input into the transfer function model to obtain an active power-frequency response model of matching control with an additional damping link added.

6. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 5 is characterized in that: The active power-frequency response model is: ； in, k p represents the power angle coefficient, ω B Indicates the power base value, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, s represents the Laplace operator, and C represents the DC capacitance.

7. The additional damping strategy and parameter setting method of the matching control type grid-connected converter according to claim 1 is characterized in that: The method of using the active power-frequency response model to solve the damping ratio expression and the natural oscillation frequency expression includes: Based on the active power-frequency response model and the second-order transfer function characteristics, the damping ratio expression and the natural oscillation frequency expression are obtained.

8. The additional damping strategy and parameter setting method of a matching control type grid-connected converter according to any one of claims 1 to 7, characterized in that: The control parameters include: DC voltage matching coefficient and damping coefficient; The determining of the control parameters in the active power-frequency response model comprises: ； in, K c represents the DC voltage matching coefficient, K δ represents the damping coefficient, C represents the DC capacitance, ω n represents the natural oscillation angular frequency, k p represents the power angle coefficient, ω B Indicates the power base value, ζ Represents the damping ratio.

9. An additional damping strategy and parameter setting device for a matching control type grid-connected converter, characterized in that: include: A determination module, used to determine circuit parameters and calculate the power angle coefficient and power base value through the circuit parameters; A construction module, configured to construct an active power-frequency response model of matching control with damping added based on the power angle coefficient and the power base value; A solution module, used for solving a damping ratio expression and a natural oscillation frequency expression by using the active power-frequency response model; A setting module is used to determine the control parameters in the active power-frequency response model based on preset constraints and using the damping ratio expression and the natural oscillation frequency expression.

10. An electronic device comprising 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 additional damping strategy and parameter setting method of the matching control type grid-connected converter based on any one of claims 1 to 8 is implemented.

Images