Abstract: According to the poor decoupling phenomenon and motor parameters dependent problem of doubly-fed wind turbine controlled by the traditional vector, this paper puts forward nonlinear control strategy based on sliding mode variable structure control and feedback linearization control. The control principle and the advantages and disadvantages of the two strategies are analyzed in details. Under PSCAD environment, the nonlinear control strategy is applied to DFIG vector control to establish the system model. Simulation results show that the proposed strategy can achieve the maximum power point tracking, and active and reactive power decoupling of doubly-fed wind power generation system. Comparative analysis of simulation results proves good decoupling effect. The system based on sliding mode control has stronger global robustness than the feedback linearization control system. The study establishes the foundation for the control system design and implementation of the doubly-fed generator.

Key words: doubly-fed induction generator, nonlinear control, sliding mode control, feedback linearization control, decoupling control

摘要： 针对传统矢量控制双馈风力发电机动态解耦不佳现象及电机参数依赖性问题，提出基于滑模变结构控制和反馈线性化控制的非线性控制策略。分别对两种策略的控制原理和优缺点进行了详细分析。在PSCAD环境中，将非线性控制策略应用于DFIG矢量控制中，建立其系统模型。仿真结果表明：提出的两种策略均能实现双馈风力发电系统最大功率点跟踪以及有功功率和无功功率解耦。对仿真结果进行对比分析，发现基于滑模变结构的系统有较好的解耦效果，较强的全局鲁棒性，控制效果优于反馈线性化控制，为双馈发电机励磁控制系统的设计奠定了理论基础。

关键词: 双馈电机, 非线性控制, 滑模控制, 反馈线性化控制, 解耦控制