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电网技术  2014 

两电平空间矢量脉宽调制的简化算法和电压谐波分析方法

DOI: 10.13335/j.1000-3673.pst.2014.09.030, PP. 2504-2510

Keywords: 两电平变流器,空间矢量脉宽调制,简化算法,电压谐波分析

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Abstract:

传统的两电平空间矢量脉宽调制(spacevectorpulsewidthmodulation，SVPWM)算法流程复杂，计算量较大。从传统算法的伏秒平衡方程出发，推导并求解了三相上开关器件脉宽时间所满足的线性方程组，提出了一种无需坐标变换和扇区判断的两电平SVPWM简化算法。该算法流程简单，计算量少，且在参考电压含不对称分量时仍与传统算法等价。在此基础上，针对采用同步SVPWM的两电平变流器，提出了一种电压谐波分析方法，给出了在不同零矢量分配方式下通用的电压谐波频谱计算公式，并定性分析了电压谐波的频谱分布特性。基于PSCAD/EMTDC的仿真结果验证了所提的两电平SVPWM简化算法和电压谐波分析方法的准确性。

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