风电并网变换器直接功率控制策略

摘要

针对直驱型永磁同步风力发电机背靠背驱动变换器中的网侧变换器,对直接功率控制策略进行了研究.相对于常规矢量控制策略而言,引入直接功率控制策略不仅能够提高变换器的动态响应特性,而且对参数变化具有较好的鲁棒性.在建立三相电压型并网逆变器静止坐标系下数学模型的基础上,阐述了并网逆变器直接功率控制机理,论述了并网逆变器直接功率控制的设计过程.搭建3 kW仿真和实验平台进行相应实验研究,结果验证了直接功率控制设计的正确性.%This paper focuses on the direct power control of grid-connected converter in the back to back drive con verter which is used for the direct-driven permanent synchronous wind-power generation system. Compared with con ventional vector control strategy,the direct power control strategy not only improves the converter dynamic response but also has better robust for parameter transformation.On the basis of establishing mathematical model of three-phase voltage source grid-connected inverter in static coordinate, the direct power control mechanism of grid-connected in verter is elaborated and the design process of it is discussed.In order to test and verify the correctness and perfor mance of direct power control,a 3 kW simulation and experimental platform is constructed and the corresponding ex perimental study is conducted.