三相静止坐标系不连续PWM实现方法研究

Research on DPWM Implementation Method in Three-phase Static Coordinate

传统空间矢量脉宽调制(SVPWM)是一种连续的脉宽调制(PWM),开关次数多、损耗大,大大降低了系统效率,同时需要进行坐标变换,数字化实现复杂,对硬件要求很高。通过对SVPWM原理深入分析,提出了一种基于三相静止a,b,c坐标系来实现不连续PWM(DPWM)的方法,该方法可有效降低开关损耗,提高系统效率,与传统调制实现方法相比,避免3/2坐标变换,简化了数字实现,具有一定工程意义,仿真和实验结果表明了提出的a,b,c坐标系DPWM实现方法的可行性和有效性。

The traditional space vector pulse width modulation（SVPWM） is continuous pulse width modulation（PWM）,the number of switching and loss are very large, greatly reduces the system efficiency, which needs coordinate transformation,digital implementation is complex, and the hardware requirement is high.A method of discrete PWM（DPWM） based on three-phase static a,b,c coordinate system is proposed by analyzing the principle of SVPWM.This method can effectively reduce the switching loss, compared with the traditional modulation and implementation method,it avoids the 3/2 coordinate transformation and simplifies the digital implementation.It has certain engineering significance.The simulation and experimental results show that the DPMW implementation method in a,b,c coordinate system is feasible and valid.