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两种快速的空间矢量脉宽调制算法比较

DOI: 10.13334/j.0258-8013.pcsee.2014.27.008, PP. 4613-4620

Keywords: 空间矢量脉宽调制,现场可编程门阵列,60&,#x000b0,非正交坐标系,45&,#x000b0,旋转坐标系,多电平逆变器

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Abstract:

对60°非正交坐标系和45°旋转坐标系这两种快速空间矢量脉宽调制算法(spacevectorpulsewidthmodulation,SVPWM)进行比较,目的是为工程技术人员在这两种SVPWM算法之间选择时提供一个理论和实践的参考。提出了一种新的针对这两种方法的任意多电平调制通用算法,只需角度和调制比两个信号就能够决定最终的矢量开关顺序。理论分析结果表明,45°旋转坐标系SVPWM比60°非正交坐标系SVPWM更简单,计算量小,更适合于数字实现。两种算法都以硬件的方式在FPGA上用VHDL语言编程实现,并对实现的复杂度和逻辑资源占用这两方面进行比较。仿真结果表明,45°旋转坐标系下的SVPWM算法比60°坐标系下的SVPWM算法在简洁性和资源占用方面具有明显的优势。最后,在一个三电平中点箝位型逆变器上对所提的两种通用算法进行了实验验证。

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