地铁牵引逆变器PWM调制研究与实现

Research and Implementation of Metro Traction Converter PWM Method

在研究分析用于牵引传动领域的脉宽调制技术的基础上,针对自主研发地铁牵引逆变器设计了分段调制策略。为使电机控制的采样周期与脉冲产生周期同步且保持恒定,基于设计的调制策略提出了一种具体实现方式,并给出了不同调制模式之间的平滑切换方法和网压波动时切换点的修正方法。试验结果验证了设计调制策略及实现方式的正确性。

Based on the research and analysis of pulse width modulation technology used in traction area,the subsection modulation strategy is designed for the independent and developed metro traction inverter.In order to keep the sample period for the motor control pace with the pulse generation period,and being a constant value,a realization mode is proposed.The smooth transition method when modulation modes switching and switching point correction method when net voltage fluctuating are also introduced.The designed modulation strategy and the realization mode are verified by the experiment results.