CN-122026542-A - Virtual inertia control method for doubly-fed wind generator set and related equipment

CN122026542ACN 122026542 ACN122026542 ACN 122026542ACN-122026542-A

Abstract

The invention discloses a virtual inertia control method and related equipment for a doubly-fed wind generator set, wherein the method comprises the steps of obtaining frequency deviation and frequency change rate of the doubly-fed wind generator set, inputting the frequency deviation and the frequency change rate into a variable coefficient Bang-Bang controller, performing variable coefficient control to obtain a self-adaptive virtual inertia coefficient, calculating virtual inertia power based on the self-adaptive virtual inertia coefficient and the frequency change rate, calculating sagging power according to the frequency deviation and the sagging coefficient, superposing the virtual inertia power, the sagging power and a maximum power tracking reference value to obtain an active power instruction, and transmitting the active power instruction to a rotor side converter of the doubly-fed wind generator set, so that virtual inertia and primary frequency modulation support of a power grid are realized. The dynamic self-adaptive virtual inertia support can be realized, and the frequency stability level of the power system under high wind power permeability is improved.

Inventors

YAO ZHONGYUAN
HAN XINGXING
ZHANG YU
LI DONG
ZHANG YING
XU CHANG
KANG BO
XUE FEIFEI
YAN YAN
GU YICHENG

Assignees

华能国际电力江苏能源开发有限公司清洁能源分公司
盛东如东海上风力发电有限责任公司
河海大学

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (10)

1. The virtual inertia control method for the doubly-fed wind generator set is characterized by comprising the following steps of: Obtaining frequency deviation and frequency change rate of a doubly-fed wind generator set; Inputting the frequency deviation and the frequency change rate into a variable coefficient Bang-Bang controller, and performing variable coefficient control to obtain a self-adaptive virtual inertia coefficient; calculating virtual inertia power based on the adaptive virtual inertia coefficient and the frequency change rate; calculating droop power according to the frequency deviation and the droop coefficient; Superposing the virtual inertia power, the sagging power and the maximum power tracking reference value to obtain an active power instruction; and transmitting the active power instruction to a rotor-side converter of the doubly-fed wind generating set, so that virtual inertia and primary frequency modulation support of a power grid are realized.
2. The virtual inertia control method for a doubly-fed wind generator set according to claim 1, wherein the obtaining process of the frequency deviation and the frequency change rate of the doubly-fed wind generator set includes: Detecting the grid-connected point frequency of the doubly-fed wind generator set through a phase-locked loop; subtracting the grid-connected point frequency from the rated power to obtain frequency deviation; and carrying out differential low-pass filtering on the grid-connected point frequency to obtain a frequency change rate.
3. The virtual inertia control method for a doubly-fed wind generator set according to claim 2, wherein the coefficient-varying control includes: Comparing the absolute value of the frequency deviation with a preset threshold value, and if the absolute value of the frequency deviation is not greater than the preset threshold value, the self-adaptive virtual inertia coefficient is equal to the reference virtual inertia coefficient; The strong virtual inertia coefficient is the product of the first coefficient and the reference virtual inertia coefficient, and the weak virtual inertia coefficient is the product of the second coefficient and the reference virtual inertia coefficient.
4. A virtual inertia control method for a doubly-fed wind generator set according to claim 3, wherein the first coefficient has a value greater than 1 and the first coefficient has a value in the range of 0 to 1.
5. The virtual inertia control method for a doubly-fed wind generator set according to claim 4, wherein a calculation formula of the virtual inertia power is expressed as follows: ; Wherein, the Is virtual inertia power; is a self-adaptive virtual inertia coefficient; is the rate of change of frequency.
6. The virtual inertia control method for a doubly-fed wind generator set according to claim 5, wherein a calculation formula of droop power is expressed as follows: ; Wherein, the Is droop power; Is a sagging coefficient; is the frequency deviation.
7. The virtual inertia control method for a doubly-fed wind generator set according to claim 6, wherein the droop coefficient is set in segments according to an average wind speed, comprising: when the average wind speed is in the range of 6-8 m/s, the droop coefficient is 15MW/Hz; When the average wind speed is 8-10 m/s in sections, the sagging coefficient is 25MW/Hz; When the average wind speed segment is greater than 10 m/s, the droop coefficient is 35MW/Hz.
8. The utility model provides a virtual inertia control system towards doubly-fed wind generating set which characterized in that includes: the data acquisition module is used for acquiring the frequency deviation and the frequency change rate of the doubly-fed wind generator set; The variable coefficient control module is used for inputting the frequency deviation and the frequency change rate into a variable coefficient Bang-Bang controller to perform variable coefficient control so as to obtain a self-adaptive virtual inertia coefficient; The virtual inertia power calculation module is used for calculating virtual inertia power based on the self-adaptive virtual inertia coefficient and the frequency change rate; a droop power calculation module for calculating droop power according to the frequency deviation and the droop coefficient; The power output module is used for superposing the virtual inertia power, the sagging power and the maximum power tracking reference value to obtain an active power instruction; and the transmission module is used for transmitting the active power instruction to a rotor-side converter of the doubly-fed wind generating set, so that virtual inertia and primary frequency modulation support of a power grid are realized.
9. An electronic device is characterized by comprising a memory and a processor; The memory is used for storing programs; the processor is configured to execute the program to implement the virtual inertia control method for a doubly-fed wind turbine generator set according to any one of claims 1 to 7.
10. A readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a virtual inertia control method for a doubly-fed wind power generator set according to any one of claims 1-7.

Description

Virtual inertia control method for doubly-fed wind generator set and related equipment Technical Field The invention relates to the technical field of wind power generation control, in particular to a virtual inertia control method for a doubly-fed wind generating set and related equipment. Background With the continuous improvement of the permeability of wind power in a power system, the influence of a wind turbine on the frequency stability of a power grid is increasingly remarkable. The traditional synchronous generator has inherent inertial response capability, and the kinetic energy of the rotor can be naturally released or absorbed when the frequency of the power grid fluctuates, so that the frequency change speed is effectively restrained. However, the modern wind turbine generator set represented by the doubly-fed wind turbine generator set is connected with the grid through the power electronic converter, and the rotor rotating speed and the grid frequency are decoupled, so that the wind energy capturing efficiency is improved, the natural inertial response capability of the wind turbine generator set is lost, the system inertia level of a high-proportion new energy power grid is continuously reduced, and the frequency stability problem is increasingly outstanding. For this reason, virtual inertia control techniques are widely proposed and applied. According to the technology, the change of the frequency of the power grid is detected, and an additional active power instruction is obtained through calculation according to a control algorithm, so that the wind turbine generator can simulate the inertia characteristic of the synchronous generator, and a rapid frequency support is provided for the power grid. In the prior art, a control method of a fixed coefficient is mostly adopted in a virtual inertia control strategy, namely, a constant virtual inertia coefficient and a constant droop coefficient are set. When the power grid frequency deviates, the support power is calculated according to a fixed proportional relation. Although the method can temporarily restrain the fluctuation of the frequency to a certain extent, the inherent defects limit the further improvement of the control performance, firstly, the fixed coefficient is difficult to realize optimal matching in the whole process of frequency disturbance (especially in the rapid falling and recovery stages), the response time is short, the support energy is limited, the overshoot and oscillation can be generated in the secondary falling or recovery stage of the frequency, secondly, the single control intensity cannot flexibly adapt to different stages (such as deterioration and recovery stages) of the frequency change, the support is insufficient when the disturbance is larger, the overall control effect is not ideal, and the controllable potential of the wind turbine generator cannot be fully utilized. Therefore, a method for controlling virtual inertia of a doubly-fed wind generator set capable of adaptively adjusting control intensity according to a frequency dynamic process is needed in the art, so that the doubly-fed wind generator set can participate in power grid frequency adjustment more effectively and smoothly, the defect of fixed coefficient virtual inertia control is overcome, and the frequency stability level of a power system under high wind power permeability is improved. Disclosure of Invention The invention aims to provide a virtual inertia control method for a doubly-fed wind generator set and related equipment, the method can realize dynamic self-adaptive virtual inertia support and improve the frequency stability level of the power system under high wind power permeability. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect, the present invention provides a virtual inertia control method for a doubly-fed wind generator set, including: Obtaining frequency deviation and frequency change rate of a doubly-fed wind generator set; Inputting the frequency deviation and the frequency change rate into a variable coefficient Bang-Bang controller, and performing variable coefficient control to obtain a self-adaptive virtual inertia coefficient; calculating virtual inertia power based on the adaptive virtual inertia coefficient and the frequency change rate; calculating droop power according to the frequency deviation and the droop coefficient; Superposing the virtual inertia power, the sagging power and the maximum power tracking reference value to obtain an active power instruction; and transmitting the active power instruction to a rotor-side converter of the doubly-fed wind generating set, so that virtual inertia and primary frequency modulation support of a power grid are realized. Optionally, the obtaining process of the frequency deviation and the frequency change rate of the doubly-fed wind generating set includes: Detecting the grid-connected point frequency of the dou