六相同步风力发电机双空间矢量脉宽调制电流脉动分析

Analysis of Output Current Ripple of Dual SVPWM in Six-phase Synchronous Wind Power Generator

双空间矢量脉宽调制(SVPWM)是六相同步风力发电机数字控制系统中最容易实现的一种调制策略,电流脉动是衡量调制策略电流波形质量与电机发热特性的重要指标。文中对双SVPWM调制电压矢量在矢量空间解耦坐标系中的映射特性进行分析,并指出电流脉动的原理。利用数值分析方法对单个基波周期内的谐波畸变因子(HDF)与电流脉动进行数学推导。利用最大脉动电流逆向推导的方法,得到电抗器选型参数,此选型方案简单快捷,无需繁琐的分步仿真分析。最后,通过仿真和实验结果与数值推导结果进行对比,验证了电流脉动数学推导与电抗器选型的有效性。

Dual space vector pulse width modulation （SVPWM） is the easiest modulation strategy to implement in the six-phase synchronous wind power generator digital control system, and the current ripple is an important index to weigh the current waveform quality and the generator height property of a modulation strategy. This paper analyzes the mapping property of the dual voltage vector used in the space vector decoupling coordinates, and points out the principle of the current ripple. The mathematical expressions of the harmonic distortion factor and current ripple in a single fundamental period are derived using the numerical analysis method. The reactor parameter is obtained by the backward deduction method with the information of maximum current ripple, which is simple to implement and does not need complex simulation analysis. The validity of the deduction process and reactor selection is confirmed by comparison of deduction results, simulation results and experimental results.