电力系统自动化2025，Vol.49Issue(14)：54-64,11.DOI:10.7500/AEPS20240520006
风电场接入弱电网控制耦合振荡分析及解耦抑制策略
Analysis and Decoupling Suppression Strategy of Control Coupling Oscillation for Wind Farm Connected to Weak Grid
摘要
Abstract
As the short-circuit ratio(SCR)of wind farms in large wind power bases in deserts,Gobi,and arid areas in China continues to decrease,the risk of sub-synchronous oscillation(SSO)caused by control coupling of wind farms using grid-following control connected to a weak grid is gradually increasing.It is urgent to deeply analyze the principle of control coupling oscillation and propose suppression strategies that can adapt to the extremely low SCR.Based on the transfer function of the system when direct-drive wind power is connected to a weak AC power grid,this paper analyzes the impact of each control link on the system's stability and the propagation path of the oscillation components,and reveals the mechanism that the overlapping bandwidth of control links causes a lagging phase angle superposition effect,leading to control coupling oscillations.Then,based on the above analysis,a control decoupling strategy based on virtual sampling of the near-source voltage is proposed.This method blocks the propagation of oscillation components in the phase-locked loop and grid-connected voltage feed-forward link,significantly reducing the cumulative effect of lagging phase angle,and fundamentally solving the problem of control coupling oscillation.And it also avoids the problem of traditional current loop notch filter blocking methods that are difficult to balance dynamic performance and suppression effect.The validation results indicate that the proposed method can quickly and effectively suppress oscillations under the extremely low SCR,adapt to different oscillation frequencies,and is independent on the accuracy of system inductance parameters.The controller-in-loop test has verified that the proposed method is easy to implement in engineering.关键词
直驱型风电场/跟网型控制/弱电网/次同步振荡/短路比/传递函数/阻断法/电源近端电压Key words
direct-drive wind farm/grid-following control/weak grid/sub-synchronous oscillation/short-circuit ratio(SCR)/transfer function/blocking method/near-source voltage引用本文复制引用
孙素娟,侯凯,孙立鑫,过亮,孔祥梅,曲慧星..风电场接入弱电网控制耦合振荡分析及解耦抑制策略[J].电力系统自动化,2025,49(14):54-64,11.基金项目
国家电网公司科技项目(4000-202318081A-1-1-ZN). This work is supported by State Grid Corporation of China(No.4000-202318081A-1-1-ZN). （4000-202318081A-1-1-ZN）
