Voltage source type new energy power generation broadband oscillation suppression method and system

Abstract

The invention belongs to the technical field of electric power engineering. The invention provides a voltage source type new energy power generation broadband oscillation suppression method and system. A phase-locked loop (PLL) and a power grid voltage vector are kept synchronous; obtaining a voltage d-axis component and a voltage q-axis component of a grid-connected port of a grid-connected inverter of a voltage source converter in a two-phase synchronous rotating coordinate system by combining a power grid voltage phase angle theta obtained by a phase-locked loop (PLL), and calculating a d-axis output voltage and a q-axis output voltage of a current regulator; obtaining a three-phase voltage modulation wave of the voltage source converter according to the power grid voltage phase angle theta, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage; according to the invention, the grid-connected stability is improved, and effective suppression of broadband oscillation of voltage source new energy power generation is realized.

Description

Technical Field

[0001] The present invention relates to the field of electric power engineering technology, and in particular to a method for suppressing wide-band oscillation of voltage source type renewable energy power generation, a system for suppressing wide-band oscillation of voltage source type renewable energy power generation, a computer device, a computer-readable storage medium and a computer program product. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Voltage source converters (VSCs) are widely used as grid interfaces in renewable energy, distributed generation, flexible DC and other systems to convert DC power into AC power. When a high proportion of power electronic devices are connected to the grid, the system dynamics will change profoundly, which may cause serious oscillation problems of several Hz or even thousands of Hz.

[0004] Among many analysis methods, the impedance modeling method has obvious advantages in dealing with emerging oscillation problems and is widely used in the stability analysis of power systems containing power electronic converters. At present, the control of voltage source converters (VSC) is mostly implemented in a two-phase synchronous rotating coordinate system using a DC voltage control-current control double closed-loop series connection. However, due to the existence of DC voltage and phase-locked loop PLL, the dq axis control path is asymmetric. Therefore, in the stability analysis, the impedance model of the voltage source converter VSC needs to be modeled in the form of a 2*2 matrix, and then the generalized Nyquist stability criterion is used for analysis. However, when the generalized Nyquist stability criterion is used for analysis, its stability margin lacks actual physical meaning, and it is difficult to provide a theoretical reference for the impedance reshaping of the voltage source converter VSC. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a method and system for suppressing wide-band oscillations of voltage source type renewable energy power generation. By reconstructing the current feedback control path, a voltage source converter VSC symmetrical control system is constructed to eliminate the frequency coupling phenomenon. In order to further enhance the machine-grid stability of the voltage source converter VSC symmetrical control system, a lead-lag link is introduced in the voltage feedforward link to improve the grid-connected stability and achieve effective suppression of wide-band oscillations of voltage source renewable energy power generation.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for suppressing broadband oscillation of voltage source type renewable energy power generation.

[0008] A method for suppressing wide-band oscillation of voltage source type renewable energy power generation includes the following steps:

[0009] The phase-locked loop PLL keeps synchronization with the grid voltage vector;

[0010] Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage d-axis component and the voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system are obtained, and the d-axis output voltage and the q-axis output voltage of the current regulator are calculated;

[0011] A three-phase voltage modulation wave of a voltage source converter is obtained according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0012] As a further limitation of the first aspect of the present invention, the three-phase voltage modulation wave v of the voltage source converter ma 、v mb and v mc ,include:

[0013]

[0014] Among them, v dout and v qout are the d-axis AC modulation voltage and the q-axis AC modulation voltage of the voltage source converter respectively;

[0015]

[0016] Among them, u gd and u gd are the voltage d-axis component and voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system, respectively. d and v q are the d-axis output voltage and q-axis output voltage of the current regulator respectively, τ is the lag characteristic parameter of the lead-lag compensator, and α is the lead characteristic parameter of the lead-lag compensator.

[0017] As a further limitation of the first aspect of the present invention,

[0018] Among them, u α and u β They are respectively the α-axis and β-axis components of the grid voltage in the two-phase stationary αβ coordinate system.

[0019] As a further limitation of the first aspect of the present invention, or

[0020] Among them, K pc is the current loop proportionality coefficient, K ic is the current loop integral coefficient, is the reference value of the converter output current in the d-axis coordinate system, is the reference value of the converter output current in the q-axis coordinate system, i fd and i fq They are the d-axis and q-axis feedback currents of current control respectively.

[0021] As a further limitation of the first aspect of the present invention,

[0022] in, Introducing the transfer function G of voltage and current decoupling compensation sh1 and G sh2 , respectively as the feedback quantity of the AC output current control link using proportional or proportional integral regulator, to construct a symmetrical control system. The control transfer function matrix of the symmetrical control system is a symmetrical square matrix, G sh1 and G sh2 are the voltage and current decoupling compensation transfer functions, I d0 and I q0 is the average value of the converter output current in the d-axis coordinate system and the average value of the converter output current in the q-axis coordinate system, U d0 is the average value of the d-axis component of the grid voltage, I dc is the DC current value, U dc is the DC voltage value, C dc is the DC side capacitor.

[0023] As a further limitation of the first aspect of the present invention,

[0024] Among them, i α 、i β They are the α-axis and β-axis components of the output current in the two-phase stationary αβ coordinate system.

[0025] In a second aspect, the present invention provides a voltage source type new energy power generation broadband oscillation suppression system.

[0026] A voltage source type new energy power generation broadband oscillation suppression system, comprising:

[0027] The synchronization control unit is configured to: keep the phase-locked loop PLL synchronized with the grid voltage vector;

[0028] The component calculation unit is configured to: obtain the voltage d-axis component and the voltage q-axis component of the grid-connected port of the grid-connected inverter of the voltage source converter in the two-phase synchronous rotating coordinate system in combination with the grid voltage phase angle θ obtained by the phase-locked loop PLL, and calculate the d-axis output voltage and the q-axis output voltage of the current regulator;

[0029] The oscillation suppression unit is configured to obtain a three-phase voltage modulation wave of a voltage source converter according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0030] In a third aspect, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium;

[0031] a processor adapted to execute a computer program;

[0032] A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the method for suppressing wide-band oscillation of voltage source type new energy power generation as described in the first aspect of the present invention is implemented.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor and executing the method for suppressing wide-band oscillation of voltage source type new energy power generation as described in the first aspect of the present invention.

[0034] In a fifth aspect, the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for suppressing wide-band oscillation of voltage source type new energy power generation as described in the first aspect of the present invention.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention innovatively proposes a strategy for suppressing wide-band oscillations of voltage source renewable energy power generation. By reconstructing the current feedback control path and constructing a voltage source converter VSC symmetrical control system, the frequency coupling phenomenon is eliminated. In order to further enhance the machine-grid stability of the voltage source converter VSC symmetrical control system, a lead-lag link is introduced in the voltage feedforward link, the grid-connected stability is improved, and the wide-band oscillations of voltage source renewable energy power generation are effectively suppressed.

[0037] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] Figure 1 This is a schematic diagram of the control structure of a voltage source converter VSC provided in Example 1 of the present invention.

[0040] Figure 2 A schematic diagram of a symmetrical control structure for enhancing the stability of a voltage source converter VSC provided in Example 1 of the present invention.

[0041] Figure 3 This is a control result diagram of a conventional voltage source converter VSC provided in Example 1 of the present invention.

[0042] Figure 4 This is an FFT analysis diagram of the output current of a conventional voltage source converter VSC provided in Example 1 of the present invention.

[0043] Figure 5 A diagram showing the symmetrical control result of the voltage source converter VSC stability enhancement using the present invention provided in Example 1 of the present invention;

[0044] Figure 6 A schematic diagram of a voltage source type new energy power generation broadband oscillation suppression system provided in Example 2 of the present invention;

[0045] Figure 7 A schematic diagram of a computer device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0048] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0049] Embodiment 1:

[0050] This implementation proposes a method for suppressing wide-band oscillation of voltage source renewable energy generation, such as Figure 1 As shown in the figure, it is a schematic diagram of the control structure of the voltage source converter VSC. The phase-locked loop PLL keeps synchronization with the grid voltage vector. The DC voltage obtains the active current and reactive current through the DC voltage control link DVC closed loop using a proportional-integral regulator. Then, the output voltage of the voltage source converter VSC in the two-phase synchronous rotating coordinate system is obtained through the AC output current control link using a proportional or proportional-integral regulator. Then, the pulse width modulation technology PWM is used to obtain the switching signal required to control the switching device of the voltage source converter VSC.

[0051] The three-phase current and voltage of the grid-connected port of the voltage source converter VSC are measured by voltage sensors and current sensors, and then the current and voltage of the grid-connected port of the voltage source converter VSC grid-connected inverter in the two-phase stationary coordinate system are calculated. The current and voltage are shown in formula (1) and formula (2).

[0052]

[0053] In the formula, u α 、u β are the α-axis and β-axis components of the grid voltage in the two-phase stationary αβ coordinate system, u a 、u b 、u c are the a-axis, b-axis and c-axis components of the grid voltage in the three-phase stationary abc coordinate system, i α 、i β are the α-axis and β-axis components of the output current in the two-phase stationary αβ coordinate system, i a 、i b 、i c They are respectively the a-axis, b-axis and c-axis components of the output current in the three-phase stationary abc coordinate system.

[0054] Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage and current dq-axis components in the two-phase synchronous rotating coordinate system are shown in formula (3).

[0055]

[0056] In the formula, u gd 、u gd are the d-axis and q-axis components of the grid voltage in the two-phase stationary dq coordinate system, i gd 、i gd are the α-axis and β-axis components of the output current in the two-phase stationary αβ coordinate system, and θ is the phase angle of the grid voltage vector.

[0057] The regulator of the DC voltage control link DVC using a proportional-integral regulator is shown in formula (5):

[0058]

[0059] In the formula, is the d-axis current reference value, K pu is the DC voltage closed loop proportional coefficient, V dcref is the DC voltage reference value, U dc is the DC voltage value, K iu is the DC voltage closed-loop integral coefficient.

[0060] Then the transfer function of the DC voltage control link DVC regulator can be expressed as formula (6).

[0061]

[0062] Where s is the Laplace operator.

[0063] like Figure 2 As shown in the figure, it is a schematic diagram of the symmetrical control structure of the voltage source converter VSC of the present invention. In the two-phase synchronous rotating coordinate system, the transfer function G of the voltage and current decoupling compensation is introduced. sh1 , G sh2 , respectively as the feedback quantity of the AC output current control link using proportional or proportional integral regulator, to construct a symmetrical control system. The control transfer function matrix of the symmetrical control system is a symmetrical square matrix. The transfer function G sh1 See formula (7), the transfer function G sh2 See formula (8):

[0064]

[0065] In the formula, G sh1 , G sh2 are the voltage and current decoupling compensation transfer functions, I d0 ,I q0 is the average value of the converter output current in the d-axis coordinate system and the average value of the converter output current in the q-axis coordinate system, U d0 is the average value of the d-axis component of the grid voltage, I dc is the DC current value, U dc is the DC voltage value, C dc is the DC side capacitance;

[0066] The remaining transfer functions are shown in formula (9) to formula (16):

[0067]

[0068]

[0069] Where, L is the inductance of the incoming line reactor; T s is the system sampling time;

[0070] Among them, a two-phase synchronous rotating coordinate system phase-locked loop H based on proportional integral regulator is used. pll See formula (17):

[0071]

[0072] In the formula, K pp , K ip It is the proportional parameter of the proportional-integral regulator for the phase-locked loop and the integral parameter of the proportional-integral regulator for the phase-locked loop.

[0073] After the voltage and current decoupling compensation transfer function is introduced, the feedback current i of the current regulator fd 、i fq See formula (18):

[0074]

[0075] The regulator of the AC output current control link using a proportional or proportional-integral regulator is shown in formula (19):

[0076]

[0077] In the formula, v d 、v q are the d-axis and q-axis current regulator output voltages, K pc is the current loop proportionality coefficient, K ic is the current loop integral coefficient, is the reference value of the converter output current in the d-axis coordinate system, is the reference value of the converter output current in the q-axis coordinate system, i fd and i fq They are the d-axis and q-axis feedback currents of current control respectively;

[0078] Furthermore, the symmetrical control system can eliminate the broadband oscillation phenomenon caused by frequency coupling. The frequency f s After the voltage disturbance signal, the voltage source converter VSC only outputs a frequency of f s The current feedback signal of the voltage source converter VSC has no frequency of 2f0-f s Current feedback signal, where f0 is the external power frequency.

[0079] like Figure 2 The schematic diagram of the symmetrical control structure of the voltage source converter VSC with enhanced stability of the present invention is shown. In the voltage feedforward path in the two-phase synchronous rotating coordinate system, the voltage feedforward correction transfer function is designed as shown in formula (20):

[0080]

[0081] In the formula, G s is the voltage feedforward correction transfer function, τ is the lag characteristic parameter of the lead-lag compensator, and α is the lead characteristic parameter of the lead-lag compensator.

[0082] Furthermore, in the two-phase synchronous rotating coordinate system, after the lead-lag compensator is introduced, the voltage feedforward term changes, and the output voltage scalar form of the voltage source converter VSC is shown in formula (21):

[0083]

[0084] In the formula, v dout and v qout are the d-axis and q-axis AC modulation voltages respectively.

[0085] According to the obtained output voltage of the voltage source converter VSC, it is transformed into a three-phase stationary coordinate system, and the PMW signal is output through pulse width modulation to control the grid-connected inverter as shown in formula (22):

[0086]

[0087] Where θ is the voltage vector phase angle obtained by the phase-locked loop, v ma 、v mb 、v mc It is the VSC three-phase voltage modulation wave.

[0088] In order to evaluate the performance of the voltage source new energy power generation broadband oscillation suppression method proposed in the present invention, the in-loop test platform of the present invention is built as follows Figure 1 The simulation model is used for verification, and the specific parameters are shown in the table below.

[0089]

[0090] Figure 3 This is the control result diagram of the conventional voltage source converter VSC used in the present invention. Figure 4 The control results of a conventional voltage source converter VSC and the FFT analysis results of the output current are shown. The oscilloscope results on the left, from top to bottom, are the DC voltage of the voltage source converter VSC and the AC output current of the voltage source converter VSC; the FFT analysis results of the AC output current of the voltage source converter VSC are shown on the right. It can be seen that under this working condition, the output current of the voltage source converter VSC is obviously distorted. Through FFT, it can be seen that there is an obvious 212Hz harmonic current with a content of more than 20%. The symmetrical control with enhanced stability of the voltage source converter VSC of the present invention is adopted. Figure 5 The corresponding simulation results and FFT analysis of the current are shown in Figure 1. It can be seen that after the introduction of voltage lead-lag compensation, the 212Hz harmonic current of the machine-grid interaction is significantly suppressed, and its content is reduced to less than 2%, which meets the grid connection requirements.

[0091] Embodiment 2:

[0092] like Figure 6 As shown, this implementation provides a voltage source type new energy power generation broadband oscillation suppression system, including:

[0093] The synchronization control unit is configured to: keep the phase-locked loop PLL synchronized with the grid voltage vector;

[0094] The component calculation unit is configured to: obtain the voltage d-axis component and the voltage q-axis component of the grid-connected port of the grid-connected inverter of the voltage source converter in the two-phase synchronous rotating coordinate system in combination with the grid voltage phase angle θ obtained by the phase-locked loop PLL, and calculate the d-axis output voltage and the q-axis output voltage of the current regulator;

[0095] The oscillation suppression unit is configured to obtain a three-phase voltage modulation wave of a voltage source converter according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0096] The specific working process of each unit is described in Example 1 and will not be repeated here.

[0097] It is understandable that the above-mentioned modules can be separately or completely combined into one or several other units to constitute, or one (some) of the units can be further divided into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the function of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, the image processing device may also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0098] According to another embodiment of the present application, the system described in this embodiment can be constructed and the image processing method of the embodiment of the present application can be implemented by running a computer program (including program code) capable of executing the steps involved in the corresponding method described in Example 1 on a general computing device such as a computer including processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the above-mentioned computing device through the computer-readable recording medium and run therein.

[0099] Embodiment 3:

[0100] like Figure 7 As shown, this implementation provides an electronic device, which includes a processor 1001, a communication interface 1002, and a computer-readable storage medium 1003. The processor 1001, the communication interface 1002, and the computer-readable storage medium 1003 may be connected via a bus or other means.

[0101] Among them, the communication interface 1002 is used to receive and send data, the computer-readable storage medium 1003 can be stored in the memory of the electronic device, the computer-readable storage medium 1003 is used to store a computer program, the computer program includes program instructions, and the processor 1001 is used to execute the program instructions stored in the computer-readable storage medium 1003.

[0102] Processor 1001 (or CPU (Central Processing Unit)) is the computing core and control core of the electronic device, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to implement corresponding method processes or corresponding functions.

[0103] The processor 1001 is configured to execute the following process:

[0104] The phase-locked loop PLL keeps synchronization with the grid voltage vector;

[0105] Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage d-axis component and the voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system are obtained, and the d-axis output voltage and the q-axis output voltage of the current regulator are calculated;

[0106] A three-phase voltage modulation wave of a voltage source converter is obtained according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0107] The specific working process is described in Example 1 and will not be repeated here.

[0108] Embodiment 4:

[0109] This implementation provides a computer-readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The computer-readable storage medium provides a storage space that stores the processing system of the electronic device.

[0110] In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk storage; optionally, it may also be at least one computer-readable storage medium located away from the aforementioned processor.

[0111] In one embodiment, the computer-readable storage medium stores one or more instructions; the processor loads and executes the one or more instructions stored in the computer-readable storage medium to implement the following process:

[0112] The phase-locked loop PLL keeps synchronization with the grid voltage vector;

[0113] Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage d-axis component and the voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system are obtained, and the d-axis output voltage and the q-axis output voltage of the current regulator are calculated;

[0114] A three-phase voltage modulation wave of a voltage source converter is obtained according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0115] The specific working process is described in Example 1 and will not be repeated here.

[0116] Embodiment 5:

[0117] The present implementation provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device performs the following process:

[0118] The phase-locked loop PLL keeps synchronization with the grid voltage vector;

[0119] Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage d-axis component and the voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system are obtained, and the d-axis output voltage and the q-axis output voltage of the current regulator are calculated;

[0120] A three-phase voltage modulation wave of a voltage source converter is obtained according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

[0121] The specific working process is described in Example 1 and will not be repeated here.

[0122] A person skilled in the art can appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0123] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instruction can be stored in a computer-readable storage medium or transmitted by a computer-readable storage medium. The computer instruction can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (for example, coaxial cable, optical fiber, digital line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data processing device such as a server, a data center, etc. that contains one or more available media integration. Available media can be magnetic media (for example, floppy disk, hard disk, tape), optical media (for example, DVD), or semiconductor media (for example, solid-state drive (Solid State Disk, SSD)) and the like.

[0124] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for suppressing broadband oscillation of voltage source type renewable energy power generation, characterized in that: The process includes: The phase-locked loop PLL keeps synchronization with the grid voltage vector; Combined with the grid voltage phase angle θ obtained by the phase-locked loop PLL, the voltage d-axis component and the voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system are obtained, and the d-axis output voltage and the q-axis output voltage of the current regulator are calculated; A three-phase voltage modulation wave of a voltage source converter is obtained according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

2. The voltage source type new energy power generation broadband oscillation suppression method according to claim 1, characterized in that: The three-phase voltage modulation wave v of the voltage source converter ma 、v mb and v mc ,include: Among them, v dout and v qout are the d-axis AC modulation voltage and the q-axis AC modulation voltage of the voltage source converter respectively; u gd and u gd are the voltage d-axis component and voltage q-axis component of the grid-connected port of the voltage source converter grid-connected inverter in the two-phase synchronous rotating coordinate system, respectively. d and v q are the d-axis output voltage and q-axis output voltage of the current regulator respectively, τ is the lag characteristic parameter of the lead-lag compensator, and α is the lead characteristic parameter of the lead-lag compensator.

3. The voltage source type new energy power generation broadband oscillation suppression method as claimed in claim 2, characterized in that: Among them, u α and u β They are respectively the α-axis and β-axis components of the grid voltage in the two-phase stationary αβ coordinate system.

4. The voltage source type new energy power generation broadband oscillation suppression method as claimed in claim 2, characterized in that: Among them, K pc is the current loop proportionality coefficient, K ic is the current loop integral coefficient, is the reference value of the converter output current in the d-axis coordinate system, is the reference value of the converter output current in the q-axis coordinate system, i fd and i fq They are the d-axis and q-axis feedback currents of current control respectively.

5. The voltage source type new energy power generation broadband oscillation suppression method as claimed in claim 4, characterized in that: in, Introducing the transfer function G of voltage and current decoupling compensation sh1 , G sh2 , respectively as the feedback quantity of the AC output current control link using proportional or proportional integral regulator, to build a symmetrical control system. The control transfer function matrix of the symmetrical control system is a symmetrical square matrix, G sh1 and G sh2 are the voltage and current decoupling compensation transfer functions, I d0 and I q0 is the average value of the converter output current in the d-axis coordinate system and the average value of the converter output current in the q-axis coordinate system, U d0 is the average value of the d-axis component of the grid voltage, I dc is the DC current value, U dc is the DC voltage value, C dc is the DC side capacitor.

6. The voltage source type new energy power generation broadband oscillation suppression method according to claim 5, characterized in that: Among them, i α 、i β They are the α-axis and β-axis components of the output current in the two-phase stationary αβ coordinate system.

7. A voltage source type new energy power generation broadband oscillation suppression system, characterized in that: include: The synchronization control unit is configured to: keep the phase-locked loop PLL synchronized with the grid voltage vector; The component calculation unit is configured to: obtain the voltage d-axis component and the voltage q-axis component of the grid-connected port of the grid-connected inverter of the voltage source converter in the two-phase synchronous rotating coordinate system in combination with the grid voltage phase angle θ obtained by the phase-locked loop PLL, and calculate the d-axis output voltage and the q-axis output voltage of the current regulator; The oscillation suppression unit is configured to obtain a three-phase voltage modulation wave of a voltage source converter according to the grid voltage phase angle θ, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage.

8. A computer device, characterized in that: include: A processor and a computer readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the method for suppressing wide-band oscillation of voltage source type new energy power generation is implemented as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the method for suppressing wide-band oscillation of voltage source type new energy power generation as described in any one of claims 1-6.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the method for suppressing wide-band oscillation of voltage source type new energy power generation is implemented as described in any one of claims 1 to 6.

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