基于最佳功率给定的最大风能追踪控制策略

Optimized Active Power Reference Based Maximum Wind Energy Tracking Control Strategy

采用双馈异步发电机(DFIG)的交流励磁发电技术不但能在变速情况下实现恒频发电,更能 通过对DFIG输出有功、无功功率的解耦控制,实现最大风能的追踪。为能在不检测风速的条件下 实现最大风能的捕获,提出了基于参考功率优化计算模型的最大风能追踪控制策略,其本质是通过 控制DFIG的输出有功功率来间接控制风电机组转速以追踪风力机最佳功率曲线。在此基础上, 建立了基于矢量变换控制技术的完整的变速恒频(VSCF)风力发电控制系统。仿真和实验结果验 证了该最大风能追踪控制策略的可行性、有功与无功解耦控制的有效性及工程应用的现实性。

Due to high operation efficiency and control flexibility, the AC excited doubly-fed induction generator （DFIG） can not only realize variable-speed constant frequency （VSCF） wind-power generation, but also achieve maximum wind energy tracking by decoupling control on the output active and reactive power of DFIG. In order to track the maximum wind energy point without mechanical sensors such as wind velocity sensor, a control strategy based on the optimized calculation model of referenced active and reactive power of DFIG is proposed by controlling the output active power of DFIG, which indirectly controls the rotation speed of wind-power units so as to track the maximum wind power point. Based on the strategy, applying field-oriented vector transformation control technique, the whole control system of VSCF wind-power generation is formed. The results of simulation and experimental study testify the feasibility of the proposed strategy, meanwhile validate the correctness of the decoupled control of active and reactive power and its workability in engineering practice.