Damping controllable voltage construction method of grid-forming converter

Abstract

The invention discloses a damping controllable voltage construction method of a network construction type converter. The method comprises the following steps: acquiring output voltage of a grid-connected converter, a power grid voltage amplitude, line reactance and a reactive power error signal; determining a proportionality coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the power grid voltage amplitude and the line reactance; performing proportional differential control on the reactive power error signal according to the proportional coefficient and the differential coefficient of the reactive power error to generate a reactive power regulation signal; and according to the reactive power regulation signal and a second-order critical damping tracking equation of the voltage amplitude of the grid-connected converter, determining a voltage reference amplitude of grid construction control. Under the condition that the reactive power accurate tracking performance is guaranteed, the voltage damping control capacity is achieved, voltage oscillation can be effectively restrained, the dynamic response speed is increased, overshoot is reduced, the stability and robustness of the system are enhanced, and the reactive power adjusting capacity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter control, and in particular to a damping controllable voltage construction method and device for a grid-type converter. Background Art

[0002] The grid-building technology of the inverter is an effective means to achieve reliable grid connection and stable consumption of new energy. Grid-building control can realize power dispatch and provide stable voltage / frequency support. Its control objectives are: synchronization with the grid, achieving power sharing when operating in parallel, maintaining load power supply after disconnecting from the grid, and fault ride-through and voltage recovery capabilities. At present, droop control, virtual synchronous machine control and virtual oscillator control are widely used control methods to solve power tracking and voltage and frequency stability support. Among them, reactive-voltage control is one of the core technologies for realizing the voltage construction of grid-building converters. Its basic principle is to stabilize the voltage by adjusting reactive power output when the grid is disturbed. When the grid voltage decreases, the reactive power output is increased; when the grid voltage increases, the reactive power output is reduced, thereby achieving stable voltage control. Traditional reactive-voltage control mostly adopts the droop control principle, and adjusts the reactive power output to stabilize the voltage through the proportional integral (PI) controller. However, the traditional PI control strategy cannot effectively adjust the system damping, and the anti-disturbance performance is insufficient for the intermittent volatility of new energy or disturbances on the grid side. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a damping controllable voltage construction method and device for a grid-type converter.

[0004] In a first aspect, an embodiment of the present invention provides a damping controllable voltage construction method for a grid-connected converter, comprising:

[0005] Obtaining grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signals;

[0006] Determining a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the voltage amplitude of the grid and the line reactance;

[0007] According to the proportional coefficient and differential coefficient of the reactive power error, a reactive power error signal is subjected to proportional differential control to generate a reactive power regulation signal;

[0008] The voltage reference amplitude of the grid control is determined according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

[0009] Furthermore, the expressions of the proportional coefficient and differential coefficient of the reactive power error are:

[0010]

[0011] Where X is the line reactance, c1 and c2 are positive real numbers, V is the output voltage amplitude of the grid-connected converter, E is the grid voltage amplitude, k p is the proportionality coefficient of reactive power error, k d is the differential coefficient of reactive power error.

[0012] Furthermore, the obtaining of the grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signal comprises the following steps:

[0013] Obtaining grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power reference instructions;

[0014] Determining instantaneous reactive power according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance;

[0015] A reactive power error signal is generated according to the reactive power reference command and the instantaneous reactive power.

[0016] Furthermore, the expression of the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter is:

[0017]

[0018] in, is the first-order derivative of the output voltage amplitude of the grid-connected converter, is the second-order derivative of the output voltage amplitude of the grid-connected converter, V * is the voltage reference amplitude, ζ is the damping adjustment coefficient.

[0019] Furthermore, the method further comprises the following steps:

[0020] Establishing a Lyapunov function according to the first differential expression and the second differential expression of the reactive power error signal, and determining the first differential expression of the Lyapunov function;

[0021] According to the first differential expression, the second differential expression, the first differential expression of the Lyapunov function and the reactive voltage control equation of the reactive power error signal, the proportional coefficient of the reactive power error, the line impedance, the relationship between the output voltage of the grid-connected converter and the grid voltage amplitude, and the relationship between the differential coefficient of the reactive power error, the line impedance, the output voltage of the grid-connected converter and the grid voltage amplitude are determined.

[0022] Furthermore, the expression of the reactive voltage control equation is:

[0023]

[0024] in, is the reactive power reference command, Q s is the instantaneous reactive power.

[0025] Furthermore, the method further comprises the following steps:

[0026] According to the relationship between the reactive power error and the output voltage of the grid-connected converter when the proportional coefficient and the differential coefficient of the reactive power error change, the feasible domain of the proportional coefficient and the differential coefficient of the reactive power error is determined.

[0027] In a second aspect, the present invention further provides a damping controllable voltage construction device for a grid-type converter, comprising: a parameter acquisition module, a control parameter adjustment module, a signal generation module and a signal tracking module; wherein:

[0028] A parameter acquisition module is used to obtain the output voltage of the grid-connected converter, the grid voltage amplitude, the line reactance and the reactive power error signal;

[0029] A control parameter adjustment module, used to determine a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance;

[0030] A signal generating module, used for performing proportional differential control on a reactive power error signal according to a proportional coefficient and a differential coefficient of the reactive power error to generate a reactive power regulating signal;

[0031] The signal tracking module is used to determine the voltage reference amplitude of the grid control according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

[0032] 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 running on the processor, wherein when the processor executes the computer program, the damping controllable voltage construction method of the grid-type converter as described above is implemented.

[0033] In a fourth aspect, the present invention further provides a computer storage medium storing computer executable instructions, which, when executed, implement the damping controllable voltage construction method of the grid-type converter as described above.

[0034] The beneficial effects of the above technical solution provided by the present invention include at least: obtaining the output voltage of the grid-connected converter, the grid voltage amplitude, the line reactance and the reactive power error signal; determining the proportional coefficient and differential coefficient of the reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance; performing proportional differential control on the reactive power error signal according to the proportional coefficient and differential coefficient of the reactive power error to generate a reactive regulation signal; determining the voltage reference amplitude of the network control according to the second-order critical damping tracking equation of the reactive regulation signal and the voltage amplitude, being able to have the voltage damping control capability under the condition of ensuring the precise tracking performance of reactive power, being able to effectively suppress voltage oscillation, improve the dynamic response speed and reduce the overshoot, enhancing the stability and robustness of the system, and improving the reactive power regulation capability. By adjusting the proportional differential coefficient and the damping adjustment coefficient, the response speed of the voltage amplitude is accelerated and the reactive overshoot is effectively reduced, and the proportional differential coefficient and the damping adjustment coefficient are adjustable in a wide range, realizing a simple controller design. In addition, it has a certain degree of robustness under DC side voltage disturbances, which can effectively improve the voltage support capacity of intermittent fluctuations of new energy.

[0035] Other features and advantages of the present invention will be described in the following description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 It is a flow chart of a damping controllable voltage construction method of a grid-type converter in an embodiment of the present invention;

[0039] Figure 2 A control principle diagram of a damping controllable voltage construction method of a grid-type converter in an embodiment of the present invention;

[0040] FIG. 3( a ) is a diagram showing the reactive power PD adjustment parameter k in an embodiment of the present invention. p The relationship between e and output voltage under changes;

[0041] FIG. 3( b ) is a diagram showing the reactive power PD adjustment parameter k in an embodiment of the present invention. d The relationship between e and output voltage under changes;

[0042] Figure 4It is a transient response comparison waveform diagram of the damping controllable voltage construction method and the PI method of the grid-type converter in the embodiment of the present invention;

[0043] Figure 5 FIG. 4 is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] my country has proposed to build a new power system with new energy as the main body. As the power system develops towards clean and intelligent directions, the scale of new energy units connected to the grid continues to grow, and gradually replaces traditional thermal power units. Due to the large-scale replacement of conventional synchronous generators by new energy, the voltage support capacity of the main grid is insufficient. In the event of a fault, the system transient overvoltage level is high, which may cause wind turbines to be disconnected from the grid and the DC transmission system to be forced to operate at a reduced rating. With large-scale DC feed-in to the receiving-end power grid, the startup capacity of local conventional thermal power units has been continuously reduced, resulting in a decrease in the transient voltage support capacity of the receiving-end power grid, and a prominent problem of transient voltage stability.

[0046] The grid-building technology of the inverter is an effective means to achieve reliable grid connection and stable consumption of new energy. Grid-building control can realize power dispatch and provide stable voltage / frequency support. Its control objectives are: synchronization with the grid, achieving power sharing when operating in parallel, maintaining load power supply after disconnecting from the grid, and fault ride-through and voltage recovery capabilities. At present, droop control, virtual synchronous machine control and virtual oscillator control are widely used control methods to solve power tracking and voltage and frequency stability support. Among them, reactive power-voltage control is one of the core technologies for realizing the voltage construction of grid-building converters. Its basic principle is to stabilize the voltage by adjusting reactive power output when the grid is disturbed. When the grid voltage decreases, the reactive power output is increased; when the grid voltage increases, the reactive power output is reduced, thereby achieving stable voltage control. Traditional reactive power-voltage control mostly adopts the droop control principle, and adjusts the reactive power output to stabilize the voltage through the proportional integral (PI) controller. However, the traditional PI control strategy cannot effectively adjust the system damping, and its anti-disturbance performance is insufficient under the intermittent volatility of renewable energy or grid-side disturbances. In this context, taking into account both fast reactive power tracking and voltage damping regulation is the key control goal to improve the voltage stability of renewable energy grid converters.

[0047] The large-scale access to new energy and the commissioning of ultra-high voltage direct current transmission projects have profoundly changed the operation characteristics of the power grid, especially the transient voltage problem has become particularly prominent. The reactive power-voltage control of the virtual synchronous machine is to simulate the excitation regulation function of the traditional synchronous generator to achieve the droop characteristics of reactive power and voltage amplitude. However, it does not have the damping regulation capability. It is difficult to maintain accurate voltage and reactive power setting values ​​when the grid voltage fluctuates and the load changes, resulting in unsatisfactory transient performance of the system. On the other hand, in the case of grid faults or load mutations, especially in the case of large disturbances, the nonlinear effect of the system is more prominent. The traditional linear damping regulation method is difficult to effectively cope with the nonlinear dynamic characteristics, resulting in excessive oscillation or instability of the system. The traditional PI-based reactive power-voltage control is relatively sensitive to line impedance and short circuit. Parameter changes or uncertainties may lead to a significant decline in control performance and even system instability.

[0048] Effective damping regulation can enhance the adaptability of the power grid to the access of large-scale renewable energy, alleviate the voltage fluctuation and instability problems caused by the access of renewable energy, and promote the consumption and utilization of renewable energy. At present, the damping regulation in the grid construction technology is concentrated on the active-frequency link, and the damping is adjusted by increasing the first-order frequency coefficient, while the damping control ability of the reactive-voltage loop is ignored. At the same time, the dynamic response of the system is the speed at which the voltage recovers from the disturbance. Excessive damping may cause the system to respond slowly, while too little damping may cause the system to oscillate excessively. Therefore, damping regulation needs to find a balance between response speed and oscillation suppression. Appropriate damping regulation can ensure that the system smoothly returns to a steady state in the shortest time.

[0049] Currently, there is no reactive power-voltage loop control strategy that can achieve both accurate reactive power tracking and controllable voltage damping.

[0050] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a damping controllable voltage construction method and device for a grid-type converter.

[0051] The embodiment of the present invention provides a damping controllable voltage construction method of a grid-type converter, the process of which is as follows: Figure 1 As shown, the control principle diagram is as follows Figure 2 As shown, the following steps are included:

[0052] Step S1: Obtain the grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signal.

[0053] Step S2: determining a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance.

[0054] Step S3: performing proportional differential control on the reactive power error signal according to the proportional coefficient and differential coefficient of the reactive power error to generate a reactive power regulation signal.

[0055] Step S4: Determine the voltage reference amplitude for grid control according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

[0056] In the above method of this embodiment, the expressions of the proportional coefficient and differential coefficient of the reactive power error are:

[0057]

[0058] Where X is the line reactance, c1 and c2 are positive real numbers, V is the output voltage amplitude of the grid-connected converter, E is the grid voltage amplitude, k p is the proportionality coefficient of reactive power error, k d is the differential coefficient of reactive power error.

[0059] In the above method of this embodiment, the step of obtaining the grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signal comprises the following steps:

[0060] Obtaining grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power reference instructions;

[0061] Determining instantaneous reactive power according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance;

[0062] A reactive power error signal is generated according to the reactive power reference command and the instantaneous reactive power.

[0063] In the above method of this embodiment, the expression of the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter is:

[0064]

[0065] in, is the first-order derivative of the output voltage amplitude of the grid-connected converter, is the second-order derivative of the output voltage amplitude of the grid-connected converter, V * is the voltage reference amplitude, ζ is the damping adjustment coefficient.

[0066] Through Laplace transform, the transfer function of the system is obtained as:

[0067]

[0068] It can be seen that this system is a second-order system with a natural angular frequency of 0.5ζ, a damping coefficient of 1, and a low-frequency gain of 0dB, which can stably track the reference input signal. The larger the ζ, the greater the system damping and the slower the voltage tracking convergence speed.

[0069] In the above method of this embodiment, the expression of the reactive voltage control equation is:

[0070]

[0071] in, is the reactive power reference command, Q s is the instantaneous reactive power.

[0072] The above method of this embodiment further includes the following steps:

[0073] Establishing a Lyapunov function according to the first differential expression and the second differential expression of the reactive power error signal, and determining the first differential expression of the Lyapunov function;

[0074] According to the first differential expression, the second differential expression, the first differential expression of the Lyapunov function and the reactive voltage control equation of the reactive power error signal, the proportional coefficient of the reactive power error, the line impedance, the relationship between the output voltage of the grid-connected converter and the grid voltage amplitude, and the relationship between the differential coefficient of the reactive power error, the line impedance, the output voltage of the grid-connected converter and the grid voltage amplitude are determined.

[0075] Among them, for a purely inductive line, the reactance value is X, and the expression of instantaneous reactive power is:

[0076]

[0077] Get reactive power error signal Assuming the grid voltage and line reactance are constants, the first and second differential expressions are:

[0078]

[0079] Establish the Lyapunov function as Its first differential expression is Substituting the two equations into the reactive voltage control equation, we get:

[0080]

[0081] If guaranteed If the negative rule is true, the system is stable, then e and Need to be negative. So k p and k d The design formula is:

[0082]

[0083] Where c1 and c2 are positive real numbers, ensuring that the reactive power has a certain damping regulation capability.

[0084] The above method of this embodiment further includes the following steps:

[0085] According to the relationship between the reactive power error and the output voltage when the proportional coefficient and the differential coefficient of the reactive power error change, the feasible domain of the proportional coefficient and the differential coefficient of the reactive power error is determined.

[0086] As shown in Figure 3(a), it represents the reactive power PD adjustment parameter k p The relationship between e and output voltage under changing conditions is shown in Figure 3(b), which shows the reactive power PD adjustment parameter k d The relationship between e and output voltage under changing conditions. p >0.5, the reactive voltage loop ensures tracking of the output voltage and the reactive power deviation is 0, k p When k is 1, d <1.85, the reactive power deviation remains at 0. Based on the above formula, it can be deduced that the design k p and k d feasible domain.

[0087] Preferably, the average power value of the instantaneous reactive power is calculated by a first-order low-pass filter, and the cut-off frequency of the low-pass filter is ω c The relationship between the designed damping adjustment coefficient is:

[0088] ω c >0.5ζ.

[0089] like Figure 4 As shown in the figure, in the grid-connected mode, a reactive power command of 1pu is applied after 15s. This scheme can quickly and accurately track the reactive power command. Compared with the traditional PI controller, it effectively reduces the overshoot while ensuring rapid adjustment of reactive power, reduces the fluctuation of the grid output voltage, and can adjust the voltage damping according to the grid demand.

[0090] In the above method of this embodiment, by obtaining the output voltage of the grid-connected converter, the grid voltage amplitude, the line reactance and the reactive power error signal; determining the proportional coefficient and the differential coefficient of the reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance; performing proportional differential control on the reactive power error signal according to the proportional coefficient and the differential coefficient of the reactive power error to generate a reactive regulation signal; determining the voltage reference amplitude of the network control according to the second-order critical damping tracking equation of the reactive regulation signal and the voltage amplitude, it is possible to have the voltage damping control capability while ensuring the precise tracking performance of reactive power, effectively suppress voltage oscillation, improve the dynamic response speed and reduce the overshoot, enhance the stability and robustness of the system, improve the reactive power regulation capability, and accelerate the response speed of the voltage amplitude and effectively reduce the reactive overshoot by adjusting the proportional differential coefficient and the damping adjustment coefficient, and the proportional differential coefficient and the damping adjustment coefficient are adjustable in a wide range, thereby realizing a simple controller design, and in addition, it has a certain robustness under the DC side voltage disturbance, and can effectively improve the voltage support capability of the intermittent volatility of new energy.

[0091] Those skilled in the art can change the above sequence without departing from the protection scope of the present disclosure.

[0092] Another embodiment of the present invention provides a damping controllable voltage construction device for a grid-type converter, comprising: a parameter acquisition module, a control parameter adjustment module, a signal generation module and a signal tracking module, wherein:

[0093] A parameter acquisition module is used to obtain the output voltage of the grid-connected converter, the grid voltage amplitude, the line reactance and the reactive power error signal;

[0094] A control parameter adjustment module, used to determine a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance;

[0095] A signal generating module, used for performing proportional differential control on a reactive power error signal according to a proportional coefficient and a differential coefficient of the reactive power error to generate a reactive power regulating signal;

[0096] The signal tracking module is used to determine the voltage reference amplitude of the grid control according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

[0097] Regarding the system in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0098] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, whose structure is as follows: Figure 5As shown, it includes: a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the damping controllable voltage construction method of the aforementioned grid-type converter is implemented.

[0099] Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, in which computer executable instructions are stored. When the computer executable instructions are executed by a processor, the damping controllable voltage construction method of the aforementioned grid-type converter is implemented.

[0100] Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention shall still fall within the patent scope of the present invention.

[0101] Unless otherwise stated, the "connection" mentioned above refers to a logical relationship of current transmission, and does not necessarily mean a direct electrical connection. At the same time, "first", "second", etc. do not indicate a sequence, but are only used to identify related units, devices, etc.

[0102] The present invention is not limited to the above voltage levels, which are merely voltage levels in the embodiments.

Claims

1. A damping controllable voltage construction method for a grid-type converter, characterized in that: The following steps are involved: Obtaining grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signals; Determining a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the voltage amplitude of the grid and the line reactance; According to the proportional coefficient and differential coefficient of the reactive power error, a reactive power error signal is subjected to proportional differential control to generate a reactive power regulation signal; The voltage reference amplitude of the grid control is determined according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

2. The method according to claim 1, characterized in that The expressions of the proportional coefficient and differential coefficient of the reactive power error are: Where X is the line reactance, c1 and c2 are positive real numbers, V is the output voltage amplitude of the grid-connected converter, E is the grid voltage amplitude, k p is the proportionality coefficient of reactive power error, k d is the differential coefficient of reactive power error.

3. The method according to claim 2, characterized in that The method of obtaining the grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power error signal comprises the following steps: Obtaining grid-connected converter output voltage, grid voltage amplitude, line reactance and reactive power reference instructions; Determining instantaneous reactive power according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance; A reactive power error signal is generated according to the reactive power reference command and the instantaneous reactive power.

4. The method according to claim 3, characterized in that The expression of the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter is: in, is the first-order derivative of the output voltage amplitude of the grid-connected converter, is the second-order derivative of the output voltage amplitude of the grid-connected converter, V * is the voltage reference amplitude, ζ is the damping adjustment coefficient.

5. The method according to claim 4, characterized in that The following steps are also included: Establishing a Lyapunov function according to the first differential expression and the second differential expression of the reactive power error signal, and determining the first differential expression of the Lyapunov function; According to the first differential expression, the second differential expression, the first differential expression of the Lyapunov function and the reactive voltage control equation of the reactive power error signal, the proportional coefficient of the reactive power error, the line impedance, the relationship between the output voltage of the grid-connected converter and the grid voltage amplitude, and the relationship between the differential coefficient of the reactive power error, the line impedance, the output voltage of the grid-connected converter and the grid voltage amplitude are determined.

6. The method according to claim 5, characterized in that The expression of the reactive voltage control equation is: in, is the reactive power reference instruction, and Qs is the instantaneous reactive power.

7. The method according to claim 6, characterized in that The following steps are also included: According to the relationship between the reactive power error and the output voltage of the grid-connected converter when the proportional coefficient and the differential coefficient of the reactive power error change, the feasible domain of the proportional coefficient and the differential coefficient of the reactive power error is determined.

8. A damping controllable voltage construction device for a grid-type converter, characterized in that: include: Parameter acquisition module, control parameter adjustment module, signal generation module and signal tracking module; wherein: A parameter acquisition module is used to obtain the output voltage of the grid-connected converter, the grid voltage amplitude, the line reactance and the reactive power error signal; A control parameter adjustment module, used to determine a proportional coefficient and a differential coefficient of a reactive power error according to the output voltage of the grid-connected converter, the grid voltage amplitude and the line reactance; A signal generating module, used for performing proportional differential control on a reactive power error signal according to a proportional coefficient and a differential coefficient of the reactive power error to generate a reactive power regulating signal; The signal tracking module is used to determine the voltage reference amplitude of the grid control according to the reactive power regulation signal and the second-order critical damping tracking equation of the output voltage amplitude of the grid-connected converter.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the damping controllable voltage construction method of the grid-connected converter according to any one of claims 1 to 7 is implemented.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, which, when executed, implement the damping controllable voltage construction method of the grid-connected converter according to any one of claims 1 to 7.

Images