Control method for grid-forming converter to suppress grid oscillation based on synchronization control

Abstract

The application discloses a control method for suppressing power grid oscillation of a converter based on synchronous control, comprising the following steps: designing a damping gain coefficient of reactive additional damping control and a band-pass filter parameter; obtaining an AC side current of the converter and a grid-connected point voltage, and decomposing the same to obtain components, obtaining an output angular frequency, active power and reactive power of the converter, obtaining a grid-connected point voltage amplitude of the converter, and obtaining an angular frequency rated value; subtracting the output angular frequency of the converter from the angular frequency rated value to obtain an input signal, obtaining a damping reactive power output signal through a damping gain link and a band-pass filter, and introducing the damping reactive power output signal into a reactive control link in a control loop of the converter; calculating a phase of the converter, calculating a grid-connected point voltage, an AC side current and an AC side modulation voltage of the converter; calculating a voltage of the AC side modulation voltage of the converter in a stationary coordinate system, and forming a corresponding pulse signal according to the voltage in the stationary coordinate system to realize control of the converter.

Description

Technical Field

[0001] This invention relates to the field of grid-connected converter control technology, and more specifically, to a control method for suppressing low-frequency power oscillations in a grid-connected converter based on hybrid synchronous control. Background Technology

[0002] During power system operation, low-frequency power oscillations are a key issue affecting system stability and power supply reliability. When the system is subjected to disturbances such as load fluctuations and line faults, failure to effectively suppress these oscillations can lead to generator power angle instability, increased power fluctuations in transmission lines, and even large-scale power outages. Therefore, suppressing low-frequency power oscillations is one of the core requirements for power system stability control.

[0003] Synchronous generators, as core equipment for power generation and transmission in traditional power systems, are prone to low-frequency oscillations (0.1-2.5Hz) due to the interaction between rotor inertia and electromagnetic torque. With the continuous increase in single-unit capacity and total system installed capacity, the harmfulness of these oscillations has significantly intensified. To address this issue, existing technologies typically incorporate power system stabilizers within the excitation system of synchronous generators. By collecting and processing system frequency, power, and other signals, these stabilizers provide additional damping to the system, effectively suppressing low-frequency oscillations and ensuring the stable operation of traditional power systems.

[0004] However, with the large-scale application of flexible DC transmission technology in new power systems, the converter, lacking physical rotating parts, has inherent limitations in its ability to support system stability through virtual inertia and virtual damping coefficient, making it difficult to meet the requirements of stable operation for new power systems.

[0005] Against this backdrop, hybrid synchronous control converters, due to their technical advantage of stable operation across a wide range of grid intensity variations, have become key equipment carriers in renewable energy grid-connected systems. They also bear the responsibility of suppressing low-frequency power oscillations in the power system. Therefore, a control method is needed to enable the converter to suppress low-frequency oscillations in the power system. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects and deficiencies of the prior art and provide a control method for suppressing grid oscillations in a grid-connected converter based on synchronous control. By using reactive power to control the amplitude of the voltage at the grid connection point, the grid-connected converter using hybrid synchronous control can provide damping for other units in the system after grid connection, thereby improving the oscillation stability of the new power system.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A control method for suppressing grid oscillations in a grid-connected converter based on synchronous control includes the following steps:

[0009] Design the damping gain coefficient and bandpass filter parameters for reactive power additional damping control;

[0010] Obtain the AC side current and grid connection point voltage of the grid-connected converter, and decompose them to obtain components. Obtain the actual and reference values ​​of the output angular frequency, output active power and output reactive power of the grid-connected converter. Obtain the reference value of the voltage amplitude at the grid connection point of the grid-connected converter. Obtain the rated value of the angular frequency.

[0011] The input signal is obtained by subtracting the rated value of the output angular frequency of the grid converter from the output angular frequency. The damped reactive power output signal is obtained by passing through the damping gain stage and the bandpass filter. The damped reactive power output signal is then introduced into the reactive power control stage in the control loop of the grid converter.

[0012] Calculate the phase reference value of the grid-connected converter, the voltage reference value of the grid-connected converter at the grid connection point, the current reference value of the AC side of the grid-connected converter, and the voltage reference value of the AC side modulation voltage of the grid-connected converter.

[0013] Calculate the voltage reference value of the AC side modulation voltage of the grid converter in the stationary coordinate system. Based on the voltage reference value in the stationary coordinate system, generate the corresponding pulse signal based on pulse modulation theory to realize the control of the grid converter.

[0014] Furthermore, the damping gain coefficient is related to the oscillation characteristics of the power system and the reactive power droop coefficient K. Q Related to the damping gain coefficient K d The calculation formula is as follows:

[0015] ;

[0016] In the formula, K Q is the reactive power droop coefficient; K is the damping gain adjustment coefficient, and the selection range of K is (1~1.2).

[0017] Since the low-frequency power oscillation range of the power system is 0.2~2.5Hz, its center frequency can be directly taken as the synchronous generator oscillation frequency of 2.5Hz. The formula for calculating the quality factor Q of the bandpass filter is as follows:

[0018] ;

[0019] In the formula, f u f is the upper cutoff frequency of the bandpass filter; l f is the lower cutoff frequency of the bandpass filter; cThe center frequency is denoted by Q. A larger quality factor Q results in a narrower passband and higher frequency resolution for the bandpass filter, while a smaller quality factor Q results in a wider passband. Therefore, the quality factor Q ranges from 0.1 to 0.6.

[0020] Furthermore, the relationship between the damped reactive power output signal and the output angular frequency of the grid-type converter is as follows:

[0021] ;

[0022] In the formula, Q d ω1 is the damped reactive power output signal; ω1 is the rated angular frequency; ω s ω is the output angular frequency of the grid-type converter; s is the Laplace operator; ω c This is the center frequency of the bandpass filter.

[0023] Furthermore, the hybrid synchronization control loop of the grid-type converter consists of a power synchronization control loop and a phase-locked loop connected by an adaptive coefficient K. a The phase-locked loop in the hybrid synchronization control loop is used for proportional control, and the phase reference value of the grid-type converter is obtained according to the control equation of the hybrid synchronization control. The calculation formula is as follows:

[0024] ;

[0025] In the formula, P is the reference value for the output active power of the grid-connected converter; J is the actual value for the output active power of the grid-connected converter; D is the moment of inertia of the virtual synchronous generator; K is the damping coefficient; PLL U is the proportional coefficient for phase-locked loop proportional control; sq The voltage at the grid connection point of the grid-connected converter is the q-axis component in the dq rotating coordinate system.

[0026] Furthermore, the d-axis voltage reference value at the grid connection point of the grid-connected converter. The calculation formula is as follows:

[0027] ;

[0028] In the formula, U d0 This is a reference value for the voltage amplitude at the grid connection point of a grid-connected converter. Q is the reactive power reference value for grid-type converters. s This represents the actual reactive power value of the grid-connected converter. Using the control law described above, the reactive power of the grid-connected converter can be used to actively control the voltage amplitude at the grid connection point, thereby suppressing low-frequency power oscillations.

[0029] Furthermore, the voltage outer loop of the grid-connected converter employs virtual admittance control. The goal of this control loop is to stabilize the output voltage at a set value. Based on the voltage outer loop control equations, the reference value of the d-axis current at the converter grid connection point is obtained. and q-axis current reference value The calculation formula is as follows:

[0030] ;

[0031] In the formula, U sd U represents the d-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. sq R represents the q-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. v The virtual resistance of the virtual admittance controller; L v The virtual inductance is for the virtual admittance controller.

[0032] Furthermore, the d-axis voltage reference value of the modulation voltage of the grid-type converter. and q-axis voltage reference value The calculation formula is as follows:

[0033] ;

[0034] In the formula, I vd I represents the d-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. vq L represents the q-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. f For AC side filter inductance of grid-type converter; K p K is the proportional parameter of the current controller. i ω represents the integral parameter of the current controller; ω is the actual value of the grid connection point voltage frequency.

[0035] Furthermore, using the Parker transformation equation, the d-axis and q-axis voltage reference values ​​of the AC-side modulation voltage of the grid-type converter are transformed into the abc three-phase stationary coordinate system. The a-axis voltage reference value of the AC-side modulation voltage of the grid-type converter in the abc stationary coordinate system is then obtained. b-axis voltage reference value and c-axis voltage reference value The calculation formula is as follows:

[0036] ;

[0037] In the formula, This is the phase reference value for a grid-type converter; This is the d-axis voltage reference value for the modulation voltage of the grid-type converter; This is the q-axis voltage reference value for the modulation voltage of the grid-type converter.

[0038] After obtaining the reference values ​​of the AC side modulation voltage of the grid converter in the a-axis, b-axis, and c-axis stationary coordinate system, the control pulses corresponding to each Insulated-Gate Bipolar Transistor (IGBT) of the converter can be generated using the commonly used pulse width modulation theory, thereby controlling the grid converter.

[0039] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method for suppressing grid oscillations in a grid-type converter based on synchronous control as described above.

[0040] A storage medium, a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the control method for suppressing grid oscillations in a grid-type converter based on synchronous control as described in any of the preceding claims.

[0041] Compared with existing technologies, this invention eliminates the need for complex phase compensation stages compared to traditional virtual power system stabilizer control technologies. It simplifies the control structure through a bandpass filter, effectively suppresses low-frequency power oscillation signals, has strong engineering applicability, and can significantly improve the system's ability to suppress low-frequency power oscillations.

[0042] This invention addresses the characteristics of "low inertia and weak damping" in new power systems by embedding a reactive power additional damping controller in the reactive power control stage of a grid-type converter, which can effectively suppress low-frequency power oscillations in the power system.

[0043] This invention generates a reactive power damping signal by using damping gain and a bandpass filter based on the deviation of the output angular frequency of the grid-type converter, thereby suppressing low-frequency power oscillations in the power system and improving the operational stability of the power system. Attached Figure Description

[0044] Figure 1 This is a flowchart illustrating a control method for suppressing grid oscillations in a grid-type converter based on synchronous control.

[0045] Figure 2 This is a schematic diagram of the main circuit of a grid-connected four-unit, two-area system using a grid-type converter.

[0046] Figure 3 This diagram illustrates a comparison of the output active power of a grid-type converter employing traditional hybrid synchronous control and hybrid synchronous control with reactive power additional damping.

[0047] Figure 4This diagram illustrates a comparison of the reactive power output of a grid-type converter using traditional hybrid synchronous control and hybrid synchronous control with reactive power additional damping. Detailed Implementation

[0048] The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] Please see Figure 1 This invention discloses a control method for suppressing grid oscillations in a grid-connected converter based on synchronous control, comprising the following steps:

[0050] Design the damping gain coefficient and bandpass filter parameters for reactive power additional damping control;

[0051] Obtain the AC side current and grid connection point voltage of the grid-connected converter, and perform dq decomposition to obtain the d-axis and q-axis components respectively. Obtain the actual and reference values ​​of the output angular frequency, output active power and output reactive power of the grid-connected converter, obtain the reference value of the voltage amplitude at the grid connection point of the grid-connected converter, and obtain the rated value of the angular frequency.

[0052] The input signal is obtained by subtracting the rated value of the output angular frequency of the grid converter from the output angular frequency. The damped reactive power output signal is obtained by passing through the damping gain stage and the bandpass filter. The damped reactive power output signal is then introduced into the reactive power control stage in the control loop of the grid converter.

[0053] Calculate the phase reference value of the grid-connected converter, the d-axis voltage reference value of the grid-connected converter, the d-axis and q-axis current reference values ​​of the AC side of the grid-connected converter, and the d-axis and q-axis voltage reference values ​​of the AC side modulation voltage of the grid-connected converter.

[0054] Calculate the voltage reference value of the AC side modulation voltage of the grid converter in the stationary coordinate system. Based on the voltage reference value in the stationary coordinate system, generate the corresponding pulse signal based on pulse modulation theory to realize the control of the grid converter.

[0055] Based on the design principles of reactive power additional damping control parameters, the damping gain coefficient and bandpass filter parameters are designed respectively. Since the damping gain coefficient is related to the power system oscillation characteristics and the reactive power droop coefficient K... Q Related to the damping gain coefficient K d The calculation formula is as follows:

[0056] ;

[0057] In the formula, K Q is the reactive power droop coefficient; K is the damping gain adjustment coefficient, and the selection range of K is (1~1.2).

[0058] The design of the bandpass filter's center frequency is based on the characteristics of low-frequency power oscillations in power systems. Considering that the frequency range of low-frequency power oscillations in power systems is 0.2~2.5Hz, the center frequency of the bandpass filter is directly selected as the typical oscillation frequency of a synchronous generator, 2.5Hz. The quality factor of the bandpass filter is designed to address the characteristics of low-frequency power oscillations in power systems. The formula for calculating the quality factor of the bandpass filter can be expressed as follows:

[0059] ;

[0060] In the formula, f u f is the upper cutoff frequency of the bandpass filter; l f is the lower cutoff frequency of the bandpass filter; c The center frequency is Q; the larger the quality factor Q, the narrower the passband of the bandpass filter and the higher the frequency resolution, while the smaller the quality factor Q, the wider the passband of the bandpass filter; therefore, the value range of the quality factor Q is (0.1-0.6).

[0061] Obtain the AC side current and grid connection point voltage of the grid-connected converter, and perform dq decomposition on the AC side current and grid connection point voltage respectively to obtain the d-axis and q-axis components of the AC side current and grid connection point voltage in the dq rotating coordinate system. Obtain the actual and reference values ​​of the output angular frequency, output active power and output reactive power of the grid-connected converter, obtain the reference value of the grid connection point voltage amplitude of the grid-connected converter, and obtain the rated value of the angular frequency.

[0062] The input signal is obtained by subtracting the rated angular frequency from the output angular frequency of the grid-type converter. This input signal is then passed through a damped gain stage and a bandpass filter to obtain the damped reactive power output signal. This damped reactive power output signal is then introduced into the reactive power control stage of the grid-type converter's control loop. The relationship between the damped reactive power output signal and the output angular frequency of the grid-type converter is as follows:

[0063] ;

[0064] In the formula, Q d ω1 is the damped reactive power output signal; ω1 is the rated angular frequency; ω s ω is the output angular frequency of the grid-type converter; s is the Laplace operator; ω c This is the center frequency of the bandpass filter.

[0065] Calculate the phase reference value for the grid-type converter. The hybrid synchronization control loop of the grid-type converter consists of a power synchronization control loop and a phase-locked loop connected by an adaptive coefficient K. aThe phase-locked loop in the hybrid synchronization control loop is proportionally controlled. The phase reference value of the grid-type converter can be obtained from the control equations of the hybrid synchronization control. The calculation formula is as follows:

[0066] ;

[0067] In the formula, P is the reference value for the output active power of the grid-connected converter; J is the actual value for the output active power of the grid-connected converter; D is the moment of inertia of the virtual synchronous generator; K is the damping coefficient; PLL U is the proportional coefficient for phase-locked loop proportional control; sq The voltage at the grid connection point of the grid-connected converter is the q-axis component in the dq rotating coordinate system.

[0068] Calculate the d-axis voltage reference value at the grid connection point of the grid-connected converter. (d-axis voltage reference value at the grid connection point of the grid-connected converter) The calculation formula is as follows:

[0069] ;

[0070] In the formula, U d0 This is a reference value for the voltage amplitude at the grid connection point of a grid-connected converter. Q is the reactive power reference value for grid-type converters. s This represents the actual reactive power value of the grid-type converter.

[0071] Calculate the reference values ​​for the d-axis and q-axis currents on the AC side of the grid-connected converter. D-axis current reference value at the converter's grid connection point. and q-axis current reference value The calculation formula is as follows:

[0072] ;

[0073] In the formula, U sd U represents the d-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. sq R represents the q-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. v The virtual resistance of the virtual admittance controller; L v The virtual inductance is for the virtual admittance controller.

[0074] Calculate the d-axis and q-axis voltage reference values ​​for the AC side modulation voltage of the grid-type converter. (d-axis voltage reference value for the modulation voltage of the grid-type converter) and q-axis voltage reference value The calculation formula is as follows:

[0075] ;

[0076] In the formula, I vd I represents the d-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. vq L represents the q-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. f For AC side filter inductance of grid-type converter; K p K is the proportional parameter of the current controller. i ω represents the integral parameter of the current controller; ω is the actual value of the grid connection point voltage frequency.

[0077] Calculate the reference values ​​of the modulation voltage of the grid-type converter along the a-axis, b-axis, and c-axis in a three-phase stationary coordinate system. Calculate the reference value of the AC-side modulation voltage of the grid-type converter along the a-axis in an abc stationary coordinate system. b-axis voltage reference value and c-axis voltage reference value The calculation formula is as follows:

[0078] ;

[0079] In the formula, This is the phase reference value for a grid-type converter; This is the d-axis voltage reference value for the modulation voltage of the grid-type converter; This is the q-axis voltage reference value for the modulation voltage of the grid-type converter.

[0080] Based on the obtained voltage reference values ​​in the three-phase stationary coordinate system, corresponding pulse signals are generated using pulse modulation theory to control the grid-type converter. After obtaining the a-axis, b-axis, and c-axis voltage reference values ​​of the AC side modulation voltage of the grid-type converter in the abc stationary coordinate system, control pulses corresponding to each IGBT of the converter can be generated using commonly used pulse width modulation theory, thereby controlling the grid-type converter.

[0081] The system main circuit diagram is as follows Figure 2 As shown, the converter is connected to the transformer via a filter inductor, and the transformer is connected to node 8 in the four-machine, two-area system. Based on the control method for suppressing grid oscillations using a grid-connected four-machine, two-area system with synchronous control proposed in this invention, simulation verification is performed using a grid-connected four-machine, two-area system with a grid-connected converter. The simulation condition is set as follows: the transmission line between node 7 and node 8 is disconnected at 30s to simulate system disturbance. The output active power and reactive power curves of the grid-connected converter are compared with those of the traditional hybrid synchronous control and the hybrid synchronous control with reactive power additional damping control, as shown in the figure. Figure 3 and Figure 4 As shown.

[0082] Figure 3 A schematic diagram comparing the output active power of a grid-type converter when using traditional hybrid synchronous control and hybrid synchronous control with reactive power additional damping to keep the main circuit of the grid-type converter consistent. Figure 4 A schematic diagram comparing the output reactive power of a grid-type converter when using traditional hybrid synchronous control and hybrid synchronous control with reactive power additional damping control to keep the main circuit of the grid-type converter consistent.

[0083] Simulation results show that the control method for suppressing grid oscillations in grid-connected converters based on synchronous control proposed in this invention can effectively suppress low-frequency power oscillations in the power system and further improve the operational stability of grid-connected converter systems with hybrid synchronous control.

[0084] This invention also discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method for suppressing grid oscillations in a grid-connected converter based on synchronous control as described above. The electronic device of this invention can execute the control method for suppressing grid oscillations in a grid-connected converter based on synchronous control, and can execute any combination of the steps in the method embodiments, possessing the corresponding functions and beneficial effects of the method.

[0085] This invention also discloses a storage medium, a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the control method for suppressing grid oscillations in a grid-connected converter based on synchronous control as described in any of the preceding claims. The computer-readable storage medium of this invention can execute the control method for suppressing grid oscillations in a grid-connected converter based on synchronous control, and can execute any combination of the steps of the method embodiments, possessing the corresponding functions and beneficial effects of the method.

[0086] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit disclosed in the present invention should fall within the patent scope covered by the present invention.

Claims

1. A control method for suppressing grid oscillations in a grid-type converter based on synchronous control, characterized in that, Includes the following steps: Design the damping gain coefficient and bandpass filter parameters for reactive power additional damping control; Obtain the AC side current and grid connection point voltage of the grid-connected converter, and decompose them to obtain components. Obtain the actual and reference values ​​of the output angular frequency, output active power and output reactive power of the grid-connected converter. Obtain the reference value of the voltage amplitude at the grid connection point of the grid-connected converter. Obtain the rated value of the angular frequency. The input signal is obtained by subtracting the rated value of the output angular frequency of the grid converter from the output angular frequency. The damped reactive power output signal is obtained by passing through the damping gain stage and the bandpass filter. The damped reactive power output signal is then introduced into the reactive power control stage in the control loop of the grid converter. Calculate the phase reference value of the grid-connected converter, the voltage reference value of the grid-connected converter at the grid connection point, the current reference value of the AC side of the grid-connected converter, and the voltage reference value of the AC side modulation voltage of the grid-connected converter. Calculate the voltage reference value of the AC side modulation voltage of the grid converter in the stationary coordinate system. Based on the voltage reference value in the stationary coordinate system, generate the corresponding pulse signal based on pulse modulation theory to realize the control of the grid converter.

2. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 1, characterized in that, Damping gain coefficient and power system oscillation characteristics and reactive power droop coefficient K Q Related to the damping gain coefficient K d The calculation formula is as follows: ； In the formula, K Q K is the reactive power droop coefficient; K is the damping gain adjustment coefficient. The formula for calculating the quality factor Q of a bandpass filter is as follows: ； In the formula, f u f is the upper cutoff frequency of the bandpass filter; l f is the lower cutoff frequency of the bandpass filter; c The center frequency.

3. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 2, characterized in that, The relationship between the damped reactive power output signal and the output angular frequency of the grid-type converter is as follows: ； In the formula, Q d ω1 is the damped reactive power output signal; ω1 is the rated angular frequency; ω s ω is the output angular frequency of the grid-type converter; s is the Laplace operator; ω c This is the center frequency of the bandpass filter.

4. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 3, characterized in that, The hybrid synchronization control loop of the grid-type converter consists of a power synchronization control loop and a phase-locked loop connected by an adaptive coefficient K. a The phase-locked loop in the hybrid synchronization control loop is used for proportional control, and the phase reference value of the grid-type converter is obtained according to the control equation of the hybrid synchronization control. The calculation formula is as follows: ； In the formula, P is the reference value for the output active power of the grid-connected converter; J is the actual value for the output active power of the grid-connected converter; D is the moment of inertia of the virtual synchronous generator; K is the damping coefficient; PLL U is the proportional coefficient for phase-locked loop proportional control; sq The voltage at the grid connection point of the grid-connected converter is the q-axis component in the dq rotating coordinate system.

5. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 4, characterized in that, Reference value of d-axis voltage at grid connection point of grid-connected converter The calculation formula is as follows: ； In the formula, U d0 This is a reference value for the voltage amplitude at the grid connection point of a grid-connected converter. Q is the reactive power reference value for grid-type converters. s This represents the actual reactive power value of the grid-type converter.

6. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 5, characterized in that, The voltage outer loop of the grid-connected converter employs virtual admittance control. The goal of this control loop is to stabilize the output voltage at a set value. Based on the voltage outer loop control equations, the reference value of the d-axis current at the converter's grid connection point is obtained. and q-axis current reference value The calculation formula is as follows: ； In the formula, U sd U represents the d-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. sq R represents the q-axis component of the grid-connected voltage of the grid-connected converter in the dq rotating coordinate system. v The virtual resistance of the virtual admittance controller; L v The virtual inductance is for the virtual admittance controller.

7. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 6, characterized in that, d-axis voltage reference value of modulation voltage of grid-type converter and q-axis voltage reference value The calculation formula is as follows: ； In the formula, I vd I represents the d-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. vq L represents the q-axis component of the AC side current of a grid-connected converter in the dq rotating coordinate system. f For AC side filter inductance of grid-type converter; K p K is the proportional parameter of the current controller. i ω represents the integral parameter of the current controller; ω is the actual value of the grid connection point voltage frequency.

8. The control method for suppressing grid oscillations in a grid-type converter based on synchronous control according to claim 7, characterized in that, By using the Parker transformation equation, the d-axis and q-axis voltage reference values ​​of the AC-side modulation voltage of the grid converter are transformed into the abc three-phase stationary coordinate system. The a-axis voltage reference value of the AC-side modulation voltage of the grid converter in the abc stationary coordinate system is then obtained. b-axis voltage reference value and c-axis voltage reference value The calculation formula is as follows: ； In the formula, This is the phase reference value for a grid-type converter; This is the d-axis voltage reference value for the modulation voltage of the grid-type converter; This is the q-axis voltage reference value for the modulation voltage of the grid-type converter.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method for suppressing grid oscillations in a grid-type converter based on synchronous control as described in any one of claims 1 to 8.

10. A storage medium, a computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method for suppressing grid oscillations in a grid-type converter based on synchronous control as described in any one of claims 1 to 8.

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