无刷双馈风力发电系统的最大功率追踪控制策略研究

Research on Control Strategy of Maxmimal Wind-energy Tracing Control of Brushless Doubly-fed Wind-power Generation System

从转子参考轴dq模型出发,研究同步坐标下的无刷双馈电机(BDFG)的数学模型。根据BDFG的特性,采用定子磁链定向的矢量变换控制技术,提出了一种功率控制策略,设计了基于该控制策略的变速恒频无刷双馈风力发电系统。该系统通过控制发电机的控制绕组进行交流励磁,实现变速恒频发电机有功、无功率的解耦控制,从而实现最大功率捕获的高效发电运行。仿真结果验证了所提出控制策略的正确性和有效性。

Based on the analysis of wind-turbine characteristics, the idea of tracing and capturing maximal wind energy is investigated, from the rotor speed dq model, the mathematical model on synchronous coordinates for brushless doubly-fed machine （BDFM） was analyzed. And a new type of power control strategy was put forward using flux linkage oriented vector transformation control technology . The variable speed constant frequency wind turbine system was designed , which realized the independent regulation of the active and reactive power of the VSCF generator by carrying out the alternating current excitation on the control winding of generator so that the high efficiency energy generation was obtained through the maximal wind energy capturing. The simulation results were given to illustrate the correctness and feasibility of this proposed control strategy.