45°坐标系的级联五电平SVPWM算法与实现

Research and realization of cascade five-level SVPWM based on 45° coordinates

针对传统五电平SVPWM算法复杂、难于在大功率变频调速系统中实现的问题,提出基于45°坐标系的新算法。该算法在矢量扇区判断和作用时间计算方面有较大简化,避免了传统算法中大量的三角函数计算,节省处理器运算时间,并可以应用于五电平及更多电平SVPWM算法中。在MATLAB平台上对算法进行仿真,并搭建基于EP2C8Q208C8 FPGA控制器的五电平实验平台。结果表明:基于45°坐标系SVPWM算法正确、可行,计算简单,具有很强的实用性。

This paper features an improved novel simplified SVPWM algorithm as an alternative to the conventional five-level SVPWM algorithm found too complex to be used in high-power inverter system.A simplified SVPWM algorithm building on the 45° coordinates system provides a greater simplification in vector sector judgment and the function time calculation,a consequent elimination of a large number of trigonometric calculations inherent in conventional algorithm,and a much-needed reduction in the processor computing time,thus enabling its application to five-level and multi-level SVPWM algorithm.The proposed algorithm is validated by the simulations on MATLAB and the provision of a five-level experimental platform based on EP2C8Q208C8 FPGA as controller.The simulation experiment proves that the novel algorithm is correct and feasible.