Phase-locked angle deviation feedforward control method and system for improving new energy power generation inertia

Abstract

The invention provides a phase-locked angle deviation feedforward control method and system for improving new energy power generation inertia. The method comprises the following steps: acquiring a three-phase stator AC voltage under a static coordinate system; converting the three-phase stator AC voltage under the static coordinate system to obtain a stator voltage q-axis component; according to the stator voltage q-axis component, a phase-locked loop original output phase angle under typical phase-locked control is obtained; multiplying the q-axis component of the stator voltage by a proportional element, and filtering to obtain a compensation phase angle; and introducing the compensation phase angle into the original output phase angle of the phase-locked loop to obtain a phase-locked output phase angle under phase-locked angle deviation feed-forward control, so that the inertia response capability of the new energy is improved, the fast response capability of the phase-locked loop is ensured by the feed-forward mode, and the performance of the phase-locked loop is improved. And the astable error tracking capability of the original PI control link is not influenced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of renewable energy power generation, and in particular to a phase-locked angle deviation feedforward control method and device for improving the inertia of renewable energy power generation. Background Art

[0002] Driven by the low-carbon goal, new energy sources such as doubly-fed wind turbines have developed rapidly. However, under typical control, the wind turbine adopts maximum power point tracking control, and its rotor speed is decoupled from the grid frequency. Therefore, the doubly-fed wind turbine does not have a spontaneous inertia response similar to that of a synchronous generator set. This leads to a gradual decrease in system inertia, posing a serious challenge to system frequency security. For this reason, many inertia control methods have attracted a lot of attention. At present, methods for releasing the kinetic energy of wind turbine rotors have received widespread attention due to their economic efficiency, including virtual synchronous generator control represented by grid control and virtual inertia control represented by following control. Virtual synchronous control has similar inertia and damping links to synchronous machines, and directly controls the output phase angle of the converter modulation voltage.

[0003] However, it abandons the traditional vector control structure, and it is still difficult to strike a balance between transient overcurrent suppression and strong support. In virtual inertia control, the df / dt signal is introduced into the outer loop reference instruction, but the detection, filtering and communication of the frequency signal cause the control method to respond slowly. In recent years, some scholars have found that reducing the bandwidth of the phase-locked loop can achieve the inertia response of the wind turbine in the absence of a frequency signal, which can improve the inertia response speed to a certain extent. However, it significantly reduces the bandwidth of the phase-locked loop, which is not conducive to the stable operation of the wind turbine under grid fault conditions. To this end, some scholars have introduced inertia and damping links into the phase-locked loop to achieve effective support for the system frequency. However, it still substantially reduces the bandwidth of the phase-locked loop and changes the structure of the original PI controller, resulting in obvious steady-state errors. Therefore, the existing inertia control method based on PLL optimization is difficult to balance inertia control performance, dynamic performance and zero steady-state error. Summary of the invention

[0004] In view of the defects of the prior art, the present application proposes a phase-locked angle deviation feedforward control method and system for improving the inertia of renewable energy power generation, aiming to solve the problems of poor inertia control performance, slow dynamic performance and large steady-state error of the existing inertia support method.

[0005] According to a first aspect of the present disclosure, a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation is provided, the method comprising: Obtain the three-phase stator AC voltage in the stationary coordinate system; The three-phase stator AC voltage in the stationary coordinate system is converted to obtain the q-axis component of the stator voltage; According to the stator voltage q-axis component, obtaining the original output phase angle of the phase-locked loop under typical phase-locked control; The q-axis component of the stator voltage is multiplied by the proportional link and then filtered to obtain a compensation phase angle; The compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0006] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the three-phase stator AC voltage in the stationary coordinate system is converted to obtain the stator voltage q-axis component, including: The stator three-phase stator AC voltage in the stationary coordinate system is transformed by Park to obtain the voltage U in the two-phase rotating coordinate system. sdq ; According to the voltage U in the two-phase rotating coordinate system sdq , determine the q-axis component of the stator voltage.

[0007] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein obtaining the original output phase angle of the phase-locked loop under typical phase-locked control according to the stator voltage q-axis component comprises: The q-axis component of the stator voltage is eliminated with a PI controller to eliminate the steady-state error and output the deviation of the rotation angular frequency; The deviation of the rotation angular frequency is integrated to obtain the original output phase angle of the phase-locked loop under typical phase-locked control.

[0008] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the q-axis component of the stator voltage is multiplied by a proportional link and then filtered to obtain a compensation phase angle, including: The current stator voltage q-axis component is multiplied by the proportional link , and obtain the proportional q-axis voltage component; The scaled q-axis voltage component is filtered using a low-pass filter to obtain a compensation phase angle.

[0009] According to the above aspects and any possible implementation, an implementation is further provided, wherein the compensating phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control, including: According to the q-axis component of the stator voltage, determining the variation of the q-axis component of the stator voltage; According to the variation of the q-axis component of the stator voltage, the compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control. According to the above aspects and any possible implementation, an implementation is further provided, wherein the compensation phase angle is introduced into the original output phase angle of the phase-locked loop according to the variation of the q-axis component of the stator voltage to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control, including: If the change in the q-axis component of the stator voltage is greater than 0, it is a frequency disturbance caused by the load shortage. The compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0010] According to the above aspects and any possible implementation, an implementation is further provided, wherein the compensation phase angle is introduced into the original output phase angle of the phase-locked loop according to the variation of the q-axis component of the stator voltage to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control, and further includes: If the change in the q-axis component of the stator voltage is less than 0, it is a frequency disturbance caused by the increase in load, and the compensation phase angle is negated; The inverse of the compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0011] According to a second aspect of the present disclosure, a phase-locked angle deviation feedforward control system for improving the inertia of renewable energy power generation is provided, the system comprising: A voltage acquisition module is used to acquire the three-phase stator AC voltage in a stationary coordinate system; A voltage conversion module is used to convert the three-phase stator AC voltage in a stationary coordinate system to obtain the q-axis component of the stator voltage; A phase-locked loop original output phase angle acquisition module, used to acquire the phase-locked loop original output phase angle under typical phase-locked control according to the stator voltage q-axis component; A compensation phase angle acquisition module is used to multiply the q-axis component of the stator voltage by a proportional link and then filter it to obtain a compensation phase angle; The compensation phase angle introduction module is used to introduce the compensation phase angle into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0012] According to a third aspect of the present disclosure, an electronic device is provided, comprising: a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, the method according to the first aspect of the present disclosure is implemented.

[0013] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method according to the first aspect of the present disclosure is implemented.

[0014] Compared with the prior art, the present invention achieves the following beneficial effects: (1) The present invention provides a phase-locked angle deviation feedforward control method and system for improving the inertia of renewable energy power generation. A proportional-filtering link is added to the traditional phase-locked loop structure, so that the phase-locked error after the disturbance occurs is increased, and the active output is increased, thereby improving the inertia level of renewable energy power generation to cope with the rapid deterioration of system frequency.

[0015] (2) The present invention adopts a phase-locked angle deviation feedforward method. Compared with the slow phase-locked loop based on the traditional phase-locked structure, it improves the inertia response capability of the new energy. At the same time, the feedforward method ensures the rapid response capability of the phase-locked loop and does not affect the original PI control link's ability to track the steady-state error.

[0016] (3) The present invention retains the traditional vector control structure of the existing new energy power generation unit and only introduces a proportional-filtering link in the phase-locked loop. It has strong versatility and can be applied to various new energy power generation equipment connected to the power grid through power electronics, such as double-fed wind turbines, direct-drive wind turbines, photovoltaic power generation, etc.

[0017] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which: Figure 1 A flow chart of a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation according to an embodiment of the present disclosure is shown; Figure 2 A conventional phase-locked loop control structure diagram according to an embodiment of the present disclosure is shown; Figure 3 A small signal model of inertia response of new energy power generation according to an embodiment of the present disclosure is shown; Figure 4 A structural diagram of a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation according to an embodiment of the present disclosure is shown; Figure 5 A linearized model of a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation according to an embodiment of the present disclosure is shown; Figure 6 The topology and control structure diagram of the doubly-fed wind power generation system according to the embodiment of the present disclosure are shown; Figure 7The following diagram shows a waveform diagram of active power output of a doubly-fed wind turbine generator, a waveform diagram of system frequency, and a waveform diagram of phase-locked error according to an embodiment of the present disclosure; Figure 8 A block diagram of a phase-locked angle deviation feedforward control system for improving the inertia of renewable energy power generation according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0020] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0021] In view of the problems of poor inertia control performance, slow dynamic performance and large steady-state error in the existing inertia support method, this application proposes a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation. The method comprises: obtaining a three-phase stator AC voltage in a stationary coordinate system; converting the three-phase stator AC voltage in the stationary coordinate system to obtain a q-axis component of the stator voltage; obtaining an original output phase angle of a phase-locked loop under typical phase-locked control according to the q-axis component of the stator voltage; multiplying the q-axis component of the stator voltage by a proportional link and filtering to obtain a compensation phase angle; introducing the compensation phase angle into the original output phase angle of the phase-locked loop to obtain a phase-locked output phase angle under a phase-locked angle deviation feedforward control, thereby improving the inertia response capability of new energy, and ensuring the rapid response capability of the phase-locked loop by a feedforward method, and not affecting the original PI control link's tracking capability without steady-state error.

[0022] A phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation provided by the present disclosure is described below in conjunction with the accompanying drawings.

[0023] Embodiment 1 like Figure 1 As shown, the embodiment of the present disclosure provides a flow chart of a phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation. The method 100 includes: S110, obtaining a three-phase stator AC voltage in a stationary coordinate system. S120, converting the three-phase stator AC voltage in the stationary coordinate system to obtain a q-axis component of the stator voltage.

[0024] S130, obtaining an original output phase angle of a phase-locked loop under typical phase-locked control according to the q-axis component of the stator voltage.

[0025] S140, multiplying the q-axis component of the stator voltage by a proportional link and filtering the component to obtain a compensation phase angle.

[0026] S150, introducing the compensation phase angle into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0027] In some embodiments, the three-phase stator AC voltage in the stationary coordinate system can be directly measured by a voltage sensor or a voltage transformer.

[0028] In some embodiments, in order to obtain the q-axis component of the stator voltage, the three-phase stator AC voltage in the stationary coordinate system can be converted using Park transformation based on the traditional phase-locked control structure to obtain the voltage U in the two-phase rotating coordinate system. sdq , and then according to the voltage U in the two-phase rotating coordinate system sdq , determine the stator voltage q-axis component U sq . Specifically, the conventional phase-locked control structure is as follows: Figure 2 As shown, it includes: coordinate conversion link, PI controller and integration link. In the coordinate conversion link, Park transformation is used to convert the stator three-phase voltage U sabc Converted into U in the two-phase rotating coordinate system sdq After adopting stator voltage orientation, the q-axis component of stator voltage U sq After the steady-state error is eliminated by the PI controller, the stator voltage can be coincident with the phase-locked d-axis coordinate. The output of the PI controller is the deviation of the output rotation angular frequency Δω. After integrating the signal, the phase-locked output angle θ under the typical phase-locked control structure can be obtained. ori .

[0029] Furthermore, the q-axis component of the stator voltage U sq After linearization, the change in the q-axis component of the stator voltage ΔU can be obtained sq Approximately equal to the change in phase-locking error Δθ s −Δθ pll .

[0030] in, is the stator voltage signal amplitude; ΔU sq is the change in the q-axis component of the stator voltage. In steady state, the phase-locked loop output angle θ s0 Equal to the grid voltage phase angle θpll0 , so the change in the q-axis component of the stator voltage is approximately equal to the phase-locking error Δθ s −Δθ pll .

[0031]

[0032] Furthermore, the small signal model of the inertia response of renewable energy generation is as follows Figure 3 As shown in the figure, after the power shortage event occurs, the system frequency drops and the stator voltage phase angle Δθ s When using Figure 2 When the conventional phase-locked loop structure is shown, the phase-locked loop closed-loop transfer function G pll ≈ 1, disturbance signal Δθ pll −Δθ s ≈ 0, so the system frequency disturbance event cannot be felt under the typical control structure, so the output active power is ΔPV, and it does not have the inertia response capability. In order to make the new energy power generation equipment have the inertia response capability, it is fundamentally necessary to increase Δθ after the frequency disturbance occurs. pll −Δθ s .

[0033] in, Figure 3 Middle J eq is the mechanical equivalent moment of inertia of the generator rotor; PI s ,PI Q They are proportional-integral controllers for the speed loop and reactive loop respectively; Δω re is the speed error; ΔI rd , ΔI rq are the rotor d-axis and q-axis current components respectively; X m is mutual inductance; K dδ is the d-axis component of the internal potential amplitude ΔE d The angle Δθ between the internal potential and the phase-locked coordinate system ctrl The coefficient between qδ is the q-axis component of the internal potential amplitude ΔE q The angle Δθ between the internal potential and the phase-locked coordinate system ctrl The coefficient between dE is the d-axis component of the internal potential amplitude ΔE d The coefficient between the internal potential amplitude ΔE; K qE is the q-axis component of the internal potential amplitude ΔE q The coefficient between the internal potential amplitude ΔE; K θP is the phase angle difference Δθ between the internal potential angle and the stator voltage E −Δθ s and output active power ΔP V The coefficient between θQ The internal potential angle and the stator voltage phase angle difference ΔθE −Δθ s and output reactive power ΔQ V The coefficient between .

[0034] In some embodiments, the stator voltage q-axis component is multiplied by the proportional link and then filtered to obtain the compensation phase angle, including: multiplying the current stator voltage q-axis component by the proportional link , obtaining a proportional q-axis voltage component; filtering the proportional q-axis voltage component using a low-pass filter to obtain a compensation phase angle.

[0035] Furthermore, when a frequency disturbance event caused by load shortage occurs, the stator voltage lags behind the d-axis of the phase-locked coordinate system, so that the q-axis voltage component of the stator voltage U sq The change of ΔU s >0, and the signal can sense the system frequency change. sq The (i.e. phase-locked error signal) signal can obtain the compensation phase angle Δθadd after the proportional-filtering link, where K is the proportional coefficient and T is the filtering coefficient.

[0036] Furthermore, when the load increases and causes a frequency disturbance event, ΔU sq <0, so Δθ add <0. Figure 4 As shown, in order to increase the phase angle of the phase-locked output, Δθ add Introduced into the original phase-locked output θ ori The sign should be negative.

[0037] Furthermore, the small signal linearization model of the invented phase-locked deviation feedforward control method for improving the inertia of renewable energy generation will be as follows Figure 5 shown.

[0038] The topology and control block diagram of the doubly-fed wind turbine are as follows: Figure 6 As shown, the rotor-side converter uses a rotor speed / reactive power outer loop and a rotor current inner loop. V is the wind turbine output active power, ω r * is the speed reference command, which is given by MPPT control, which uses a constant time constant T speed A first-order low-pass filter is performed to prevent frequent changes in wind speed from causing drastic changes in speed. Due to the use of unity power factor control, the reactive power reference Q V* is 0. When the speed is higher than the command value, the absorbed wind energy is reduced by adjusting the pitch angle β. The inner loop is the rotor current loop, and the rotor current error is controlled by PI to generate the rotor side modulation voltage command Vr*. On the one hand, the phase-locked loop retains the original typical control structure to achieve synchronization with the grid voltage. On the other hand, in order to improve the inertia response capability of renewable energy power generation, the present invention filters the stator q-axis voltage and proportionally leads it to the original output phase-locked angle θ ori , thereby obtaining the newly generated phase-locked loop output angle θ pll , this phase angle is used for coordinate transformation of doubly-fed wind turbine generator system.

[0039] According to the embodiments of the present disclosure, the following technical effects are achieved: (1) The present invention provides a phase-locked angle deviation feedforward control method and system for improving the inertia of renewable energy power generation. A proportional-filtering link is added to the traditional phase-locked loop structure, so that the phase-locked error after the disturbance occurs is increased, and the active output is increased, thereby improving the inertia level of renewable energy power generation to cope with the rapid deterioration of system frequency.

[0040] (2) The present invention adopts a phase-locked angle deviation feedforward method. Compared with the slow phase-locked loop based on the traditional phase-locked structure, it improves the inertia response capability of the new energy. At the same time, the feedforward method ensures the rapid response capability of the phase-locked loop and does not affect the original PI control link's ability to track the steady-state error.

[0041] (3) The present invention retains the traditional vector control structure of the existing new energy power generation unit and only introduces a proportional-filtering link in the phase-locked loop. It has strong versatility and can be applied to various new energy power generation equipment connected to the power grid through power electronics, such as double-fed wind turbines, direct-drive wind turbines, photovoltaic power generation, etc.

[0042] Embodiment 2 In order for those skilled in the art to better understand the present invention, a specific embodiment is described below: This embodiment takes 100 aggregated 1.5MW doubly-fed wind power plants as an example for simulation research as a typical new energy power generation equipment. The system parameters of the doubly-fed wind turbines are shown in Table 1. At t=50s, a 50MW load is put into the system to simulate a frequency event in the system.

[0043] Table 1

[0044] Specifically, the phase-locked loop structure and parameter settings in each scenario in the embodiment are as follows: Case I: Fast phase-locked loop. K ppll = 60, K ipll = 1400.

[0045] Case II: Slow phase-locked loop. K ppll = 2.16, K ipll = 1.4.

[0046] Case III: Inertia phase-locked loop. K ppll = 60, K ipll = 1400, J eq = 0.3, D eq =0.2.

[0047] Case IV: Phase-locked deviation feedforward control. K ppll = 60, K ipll = 1400, K = 2500, T = 1000.

[0048] like Figure 7 (a) shows the output active power waveform of the doubly-fed wind turbine generator. Figure 7 (b) is the system frequency waveform. Figure 7 (c) is the phase-locking angle error. Figure 7 As shown in (a), the fast phase-locked loop of the doubly fed wind turbine does not have the inertia response capability. However, the slow phase-locked loop slows down the phase-locked loop bandwidth and increases the phase-locked error Δθpll-Δθs, thereby improving the inertia response capability of the doubly fed wind turbine. Although the output active power amplitude of the doubly fed wind turbine when the slow phase-locked loop is used is greater than that of the phase-locked deviation feedforward control method of the present invention, the active power support time is shorter than that of the phase deviation feedforward control method. Therefore, when the phase-locked deviation feedforward control is used, Figure 7 (b) The system frequency support is the best. When the inertia phase-locked loop is used, the output active power amplitude of the doubly-fed wind turbine is the largest. Figure 7 (b) shows a very obvious oscillation characteristic of the frequency. Figure 7 It can be seen from (c) that the proposed phase-locked deviation feedforward control has the fastest response speed and no steady-state error, while the inertia phase-locked loop has a slow response speed and a phase-locked error in the steady state, which is not recommended. Therefore, compared with the existing methods, the present invention has the advantages of strong support capability, fast response speed, and no steady-state error.

[0049] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the described order of actions, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0050] The above is an introduction to the method embodiment. The following is a further explanation of the scheme disclosed in the present invention through an apparatus embodiment.

[0051] Figure 8 FIG. 1 is a block diagram of a phase-locked angle deviation feedforward control system for improving the inertia of renewable energy generation according to an embodiment of the present disclosure. Figure 8 As shown, the system includes: The voltage acquisition module 810 is used to acquire the three-phase stator AC voltage in the stationary coordinate system; The voltage conversion module 820 is used to convert the three-phase stator AC voltage in the stationary coordinate system to obtain the stator voltage q-axis component; A phase-locked loop original output phase angle acquisition module 830 is used to acquire the phase-locked loop original output phase angle under typical phase-locked control according to the stator voltage q-axis component; A compensation phase angle acquisition module 840 is used to multiply the q-axis component of the stator voltage by a proportional link and then filter it to obtain a compensation phase angle; The compensation phase angle introduction module 850 is used to introduce the compensation phase angle into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

[0052] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0053] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.

[0054] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A phase-locked angle deviation feedforward control method for improving the inertia of renewable energy power generation, characterized in that: include: Obtain the three-phase stator AC voltage in the stationary coordinate system; The three-phase stator AC voltage in the stationary coordinate system is converted to obtain the q-axis component of the stator voltage; According to the stator voltage q-axis component, obtaining the original output phase angle of the phase-locked loop under typical phase-locked control; The q-axis component of the stator voltage is multiplied by the proportional link and then filtered to obtain a compensation phase angle; The compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

2. The method according to claim 1, characterized in that The step of converting the three-phase stator AC voltage in the stationary coordinate system to obtain the stator voltage q-axis component includes: The stator three-phase stator AC voltage in the stationary coordinate system is transformed by Park to obtain the voltage U in the two-phase rotating coordinate system. sdq ; According to the voltage U in the two-phase rotating coordinate system sdq , determine the q-axis component of the stator voltage.

3. The method according to claim 2, characterized in that The step of obtaining the original output phase angle of a phase-locked loop under typical phase-locked control according to the q-axis component of the stator voltage includes: The q-axis component of the stator voltage is eliminated with a PI controller to eliminate the steady-state error and output the deviation of the rotation angular frequency; The deviation of the rotation angular frequency is integrated to obtain the original output phase angle of the phase-locked loop under typical phase-locked control.

4. The method according to claim 1, characterized in that: The step of multiplying the q-axis component of the stator voltage by a proportional link and filtering the component to obtain a compensation phase angle comprises: The current stator voltage q-axis component is multiplied by the proportional link , and obtain the proportional q-axis voltage component; The scaled q-axis voltage component is filtered using a low-pass filter to obtain a compensation phase angle.

5. The method according to claim 4, characterized in that The step of introducing the compensation phase angle into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control comprises: According to the q-axis component of the stator voltage, determining the variation of the q-axis component of the stator voltage; According to the variation of the q-axis component of the stator voltage, the compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

6. The method according to claim 5, characterized in that The method of introducing the compensation phase angle into the original output phase angle of the phase-locked loop according to the variation of the q-axis component of the stator voltage to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control comprises: If the change in the q-axis component of the stator voltage is greater than 0, it is a frequency disturbance caused by the load shortage. The compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

7. The method according to claim 5, characterized in that The method further comprises: introducing the compensation phase angle into the original output phase angle of the phase-locked loop according to the variation of the q-axis component of the stator voltage to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control. If the change in the q-axis component of the stator voltage is less than 0, it is a frequency disturbance caused by the increase in load, and the compensation phase angle is negated; The inverse of the compensation phase angle is introduced into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

8. A phase-locked angle deviation feedforward control system for improving the inertia of renewable energy power generation, characterized in that: include: A voltage acquisition module is used to acquire the three-phase stator AC voltage in a stationary coordinate system; A voltage conversion module is used to convert the three-phase stator AC voltage in a stationary coordinate system to obtain the q-axis component of the stator voltage; A phase-locked loop original output phase angle acquisition module, used to acquire the phase-locked loop original output phase angle under typical phase-locked control according to the stator voltage q-axis component; A compensation phase angle acquisition module is used to multiply the q-axis component of the stator voltage by a proportional link and then filter it to obtain a compensation phase angle; The compensation phase angle introduction module is used to introduce the compensation phase angle into the original output phase angle of the phase-locked loop to obtain the phase-locked output phase angle under the phase-locked angle deviation feedforward control.

9. An electronic device, characterized in that: It includes a processor, and a memory and a network interface connected to the processor; the network interface is connected to a non-volatile memory in a server; when the processor is running, it calls a computer program from the non-volatile memory through the network interface, and runs the computer program through the memory to execute the method described in any one of claims 1 to 7.

10. A storage medium, characterized in that: Computer program instructions are stored on the computer storage medium, and when the computer program instructions are executed by the processor, the method according to any one of claims 1 to 7 is implemented.

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