基于线性自抗扰控制的统一潮流控制器次同步振荡抑制策略  

UPFC Subsynchronous Oscillation Suppression Strategy Based on Linear Active Disturbance Rejection Control

作　　者：刘一琦 黄旭 王天昊[1] 郑钧元 LIU Yiqi;HUANG Xu;WANG Tianhao;ZHENG Junyuan(College of Computer and Control Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学计算机与控制工程学院,哈尔滨市150040

出　　处：《电力建设》2025年第2期151-159,共9页Electric Power Construction

基　　金：国家自然科学基金面上项目(52477179);中央高校基本科研基金(2572023CT15-02)。

摘　　要：大规模双馈风电场经串补线路并网容易引发次同步振荡(sub-synchronous oscillation,SSO),造成风机脱网,严重威胁电力系统的安全稳定运行。因此,提出一种应用统一潮流控制器(unified power flow controller,UPFC)附加阻尼控制抑制SSO的控制方法。该方法设计了一种解耦型线性自抗扰控制器(linear active disturbance rejection control,LADRC),通过线性状态观测器实时估计系统中的次同步扰动,并引入延时补偿环节,消除信号传输中的通信延时。基于改进型LADRC设计了UPFC的附加阻尼控制器,使得UPFC在系统中呈正阻尼状态,抑制次同步振荡,并且提高系统的抗干扰能力和鲁棒性。最后,在MATLAB/Simulink仿真软件中搭建双馈风电场经串补线路并网仿真模型,仿真结果表明,所提方法能够在不同串补度、风速、并网风机数目下有效抑制次同步振荡,可为研究我国双馈风电场远距离并网类似问题提供参考。Large-scale doubly-fed wind farms connected through series-compensated transmission lines are prone to subsynchronous oscillations(SSO),which can cause wind turbines to disconnect from the grid,posing a serious threat to the safe and stable operation of the power system.This paper proposes a control method that utilizes a unified power flow controller(UPFC)with additional damping control to mitigate SSO.The approach involves the design of a decoupled linear active disturbance rejection controller(LADRC)that uses a linear state observer to estimate the subsynchronous disturbances in the system in real time.In addition,a delay-compensation mechanism was introduced to eliminate communication delays during signal transmission.Based on the improved LADRC,an additional damping controller for the UPFC was designed to enable the UPFC to exhibit positive damping characteristics in the system,thereby suppressing SSO and enhancing the robustness and resistance of the system to disturbances.Finally,a simulation model of a doubly-fed wind farm connected to the grid through a series-compensated transmission line was developed using the MATLAB/Simulink software.The simulation results demonstrate that the proposed method effectively mitigates SSO under various conditions,including different levels of series compensation,wind speeds,and numbers of connected wind turbines.This can serve as a reference for studying similar problems of long-distance grid connections in double-fed wind farms in China.

关 键 词：双馈风电场 串补线路 次同步振荡(SSO) 线性自抗扰控制(LADRC) 

分 类 号：TM614[电气工程—电力系统及自动化]