基于电流内环滑模自抗扰控制的直驱风电场次同步振荡抑制策略研究  

Sub-synchronous oscillation suppression strategy for direct-drive wind farm based on current inner loop sliding mode active disturbance rejection control

作　　者：郭成 杨宣铭 王林玲 杨灵睿 GUO Cheng;YANG Xuanming;WANG Linling;YANG Lingrui(Faculty of Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《电力系统保护与控制》2025年第4期85-95,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52367002);云南省科技厅联合基金重点项目资助(202201BE070001-15)。

摘　　要：针对直驱风电机组网侧换流器电流内环放大次同步振荡分量导致的次同步振荡(sub-synchronous oscillation,SSO)问题,提出了一种基于电流内环滑模自抗扰控制(sliding mode-active disturbance rejection control,SM-ADRC)策略。首先,鉴于滑模控制(sliding mode control,SMC)存在高频切换进而影响控制效果的问题,设计了基于改进型的指数趋近律,采用边界可变幂函数代替趋近律原有的符号函数。其次,引入自抗扰控制的扩张状态观测器,该观测器能实时估计次同步振荡分量,并以观测量的形式补偿电流内环,弱化了SM-ADRC对网侧控制器参数的依赖程度,并进一步切断次同步振荡分量的传播路径。最后,搭建了基于风机网侧电流内环SM-ADRC的直驱风电场电磁暂态模型,通过与电流内环PI控制和SMC对SSO的抑制效果进行对比,验证了所提SM-ADRC策略的优越性。A sliding mode active disturbance rejection control(SM-ADRC)strategy based on the current inner loop of the grid-side converter is proposed to address the problem of sub-synchronous oscillation(SSO)resulting from the amplification of the SSO components.First,considering the issue of high-frequency switching in sliding mode control(SMC)that affects the control performance,an improved exponential reaching law is designed,by replacing the original sign function with a boundary variable power function in the reaching law.Then,an extended state observer with active disturbance rejection control is introduced to estimate the SSO components in real-time and compensate for the current inner loop as observed quantities.This weakens the dependence of SM-ADRC control on the parameters of the grid-side controller and further cuts off the propagation path of the SSO components.Finally,an electromagnetic transient model of the direct-drive wind farm based on grid-side current inner loop SM-ADRC control is established.By comparing the SSO suppression effect with the current inner loop PI control and SMC control,the superiority of the proposed SM-ADRC strategy is verified.

关 键 词：直驱风电场 弱交流电网 次同步振荡 滑模自抗扰控制 

分 类 号：TM614[电气工程—电力系统及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]