基于自抗扰控制的双馈风机次同步控制相互作用抑制策略研究  

Research on Subsynchronous Control Interaction Mitigation Strategy Based on Active Disturbance Rejection Control for Doubly-fed Induction Generator

作　　者：高本锋[1] 胡韵婷 李忍[1] 姚磊[1] 赵书强[1] GAO Benfeng;HU Yunting;LI Ren;YAO Lei;ZHAO Shuqiang(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources (North China Electric Power University),Baoding 071003,Hebei Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),河北省保定市071003

出　　处：《电网技术》2019年第2期655-663,共9页Power System Technology

基　　金：教育部中央高校基本科研业务费专项资金资助项目(2018MS087);国家自然科学基金项目(51507064)~~

摘　　要：双馈风电场经串补输电系统存在换流器控制与串联电容之间的次同步振荡问题,即次同步控制相互作用,其振荡特性受系统运行工况的影响。当系统运行工况变化时,现有抑制措施可能不再适用。为解决该问题,从双馈风机发生次同步控制相互作用的机理出发,提出一种基于自抗扰控制的双馈风机抑制策略:用自抗扰控制器替换转子侧有功内环比例积分控制环节,利用扩张状态观测器对系统次同步扰动进行实时估计并反馈补偿,从而有效抑制次同步控制相互作用。在PSCAD/EMTDC中搭建基于某实际风电场的仿真模型,分析该控制策略的运行特性。通过与比例积分控制对比,验证自抗扰控制具有良好的暂稳态运行特性;通过与现有附加阻尼控制对比,表明自抗扰控制可以实现风电场不同运行工况下次同步控制相互作用的有效抑制;该方法参数整定简单,具有较强的鲁棒性。Subsynchronous oscillation(SSO) problem between converter control and series capacitors exists in doubly-fed induction generator(DFIG)-based wind farm connected to series compensated transmission system. This problem is also called subsynchronous control interaction(SSCI). Its oscillation characteristics are affected by system operating conditions. Existing mitigation measures may not always be effective when system operating conditions change. To solve this problem, according to SSCI mechanism in DFIG-based wind farm, a DFIG mitigation strategy based on active disturbance rejection control(ADRC) is proposed in this paper. The inner proportional-integral(PI) controller of rotor side converter is replaced with ADRC. Subsynchronous disturbances of the system are evaluated in real time and feedback compensated with extended state observer. Therefore, the SSCI is suppressed effectively. Based on an actual wind farm structure, a detailed simulation model is built in PSCAD/EMTDC. The operating characteristics of this control strategy are analyzed. Compared with PI control, ADRC has good transient and steady-state operating characteristics. Compared with existing supplementary subsynchronous damping controller(SSDC), ADRC can mitigate SSCI effectively under different operating conditions of wind farm. Parameter setting in this method is simple and very robust to the system.

关 键 词：双馈风电场 串补输电系统 次同步控制相互作用 自抗扰控制 抑制策略 

分 类 号：TM614[电气工程—电力系统及自动化]