电励磁风力发电机组励磁控制

Excitation Regulation Study of Electrical-Excited Wind Turbines

针对电励磁同步电机与永磁同步电机相比具有励磁可调这一特性,提出在变转速工作情况下以定子电压作为控制目标的励磁控制方案,通过锁相环得到定子电压有效值以及转速,利用PI调节控制定子电压跟踪给定值。并结合电励磁同步风力发电机组的结构特点,设计了一套基于斩波电路的励磁控制器,该励磁控制器由直流母线提供稳定直流电压,省去外接励磁电源,且无需额外的灭磁装置即可实现自动灭磁。在Matlab软件平台中对所提控制算法和结构进行了仿真,并在1.5MW机组上进行验证。仿真和实验结果表明该励磁控制方案简单可靠,具有较高的快速响应能力和良好的稳态控制效果。

Compared with permanent magnet synchronous generator, electrical excited synchronous generator has the advantage of adjustable excitation. This paper presents an excitation control scheme which can regulate the stator voltage under variable speed operation situation. The RMS stator voltage and the rotate speed of the generator are obtained through a software phase-locked loop, and a PI regulator is used to control the stator voltage tracking the speed-votage curve. As the DC voltage is controlled constant in the converter topology, a set of excitation controller based on the chopper circuit is designed. It can meet the demand for automatic de-excitation without extra equipment. The proposed control algorithm and structure was simulated in the Matlab software platform and tested with the 1.5MW synchronous generator. The simulation and experimental results show that the excitation control scheme is simple and reliable, with high rapid response capability and good effect of steady state control.