无刷双馈风力发电机的控制策略与实现

Control strategy and realization of variable speed wind tubine with a brushless doubly-fed reluctance machine

为了探讨变速恒频(VSCF)控制的无刷双馈发电机(BDFM)风电系统的有效控制策略,在分析BDFM的结构特点和工作原理基础上,给出VSCF发电模式的控制方法,构建了转子转速约束下的电机d-q坐标系数学模型,推导出变速恒频运行模式的功率控制策略。根据BDFM的数学模型及功率控制策略,设计了电机侧与网侧均包含可双向变换的变频器主电路拓朴,实现了风力发电机的四象限平滑运行和VSCF的功率控制策略,并对BDFM发电系统的VSCF运行模式进行了仿真试验。仿真结果验证了本控制策略能够实现变速恒频发电,电机空载启动到1050r/min的响应时间为0.2 s,能对有功功率和无功功率解耦控制。

Based on the design features and operating principle of brushless doubly-fed machine（ BDFM）, the control mode of wind power generation system in the condition of variable speed via constant requency （VSCF） is presneted, the mathematic models are built up under d-q reference frame, and a novel power control strategy for VSCF is deduced. And then a main circuit topology which contains biderectional converters in both machine side and grid side is designed, and the four-quadrant smoothness operation of wind power generator controlled with the proposed power control srategy is implemented. The simulation results demonstrating the performance of the proposed control algorithm are presented.