双馈风电机组次同步控制相互作用的反馈线性化滑模变结构抑制  

Sub-Synchronous Control Interaction Mitigation for DFIGs by Sliding Mode Control Strategy Based on Feedback Linearization

作　　者：李鹏瀚 王杰[1] 吴飞 Li Penghan;Wang Jie;Wu Fei(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院

出　　处：《电工技术学报》2019年第17期3661-3671,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目（61374155）

摘　　要：针对双馈风电机组(DFIG)接入串补输电系统,提出基于反馈线性化的滑模变结构控制策略,并将之用于DFIG转子侧变流器控制回路以抑制次同步控制相互作用(SSCI)。首先通过反馈线性化方法抵消双馈风电机组固有的非线性;然后选取线性切换函数和指数趋近律设计滑模变结构控制策略;最后通过特征值分析和非线性时域仿真检验抑制效果,并与控制参数已整定的比例-积分控制策略和传统次同步谐振抑制策略进行对比。仿真结果表明,所提出的反馈线性化滑模变结构控制策略不仅有效抑制SSCI,使得双馈风电系统在不同风速和串补度下都能保持稳定运行,而且消除了反馈线性化控制方法对系统精确参数的依赖性,表现出对参数摄动和外界干扰的强鲁棒性。This paper proposes a sliding mode control strategy based on feedback linearization technique to mitigate sub-synchronous control interaction(SSCI)in series-compensated doubly fed induction generator(DFIG)-based wind farms.Firstly,feedback linearization was employed to cancel the inherent nonlinearities of DFIGs.Secondly,linear switching function and exponential reaching law were used for sliding mode control design.Finally,the performance of the proposed feedback-linearized sliding mode control strategy was evaluated as compared to the well-tuned proportion-integral control and conventional sub-synchronous resonance damping control through eigenvalue analysis and nonlinear time-domain simulation.Simulation results demonstrate that the designed control strategy improves system damping and mitigates SSCI under varying wind speeds and compensation levels.The proposed feedback-linearized sliding mode control also improves system robustness under external disturbances and parameter perturbation.

关 键 词：双馈风电机组 反馈线性化 串联补偿 滑模控制 次同步控制相互作用 次同步 谐振 

分 类 号：TM614[电气工程—电力系统及自动化]