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针对传统矢量控制对双馈风力发电机参数的依赖性和传统直接功率控制策略的开关频率不固定问题,提出基于滑模变结构的双馈风力发电机直接功率控制策略,把滑模变结构控制和电压空间矢量脉宽调制技术相结合,并用转子电压直接控制双馈电机的有功功率和无功功率。在PSCAD仿真环境下搭建了其系统模型,实现了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的解耦控制。系统结果表明:该控制策略具有较好的参数鲁棒性和输出电能质量,验证了该直接功率控制策略的有效性和可行性。
In view of the dependence of the traditional vector control on doubly fed wind turbine parameters and the traditional direct power control strategy, the direct power control strategy of doubly-fed wind power generator based on sliding mode variable structure is proposed. The sliding mode variable structure control And voltage space vector pulse width modulation technology combined with the rotor voltage direct control of the doubly-fed machine active power and reactive power. The system model is built under the PSCAD simulation environment to realize the maximum power point tracking and the decoupling control of active power and reactive power in doubly-fed wind power generation system. The system results show that this control strategy has better parameters robustness and output power quality, and verifies the effectiveness and feasibility of this direct power control strategy.