In voltage source inverters (VSI), the output voltage is synthesized in an average sense using pulsewidth modulation (PWM) techniques. In space vector PWM techniques, the average realization of the space vector using volt-sec balance results in an instantaneous error that influences the dc bus current. The instantaneous ac load error voltage maps onto the dc bus derive the dc bus current ripple signatures that would be useful to size the dc capacitor. Exploiting concept of instantaneous mapping of ac error voltage onto the dc bus through power factor axis coordinates, in this work, the unprecedented dc ripple voltage computational method is presented. The established synchronous power factor reference frame ensures accurate mapping of ac error voltage onto the dc bus and makes the computational method independent of sensing actual ac load current unlike conventional methods. With the eliminated actual load current dependence, the proposed model can predict the minimum dc voltage ripple yield switching sequence for VSIs at different loading conditions. The efficacy of the proposed model in terms of optimum switching sequence elicitation is demonstrated on the dual inverter configuration experimentally considering the inflated switching stress due to two inverter's switching.

中文翻译：

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通过交流负载误差伏秒计算得出双逆变器的最小直流电压纹波开关序列


在电压源逆变器 (VSI) 中，输出电压是使用脉宽调制 (PWM) 技术以平均方式合成的。在空间矢量 PWM 技术中，使用伏秒平衡实现空间矢量的平均会导致影响直流母线电流的瞬时误差。瞬时交流负载误差电压映射到直流总线上，得出直流总线电流纹波特征，这对于确定直流电容器的大小很有用。利用通过功率因数轴坐标将交流误差电压瞬时映射到直流母线的概念，在这项工作中，提出了前所未有的直流纹波电压计算方法。建立的同步功率因数参考系确保将交流误差电压准确映射到直流母线上，并使计算方法与传统方法不同，独立于感测实际交流负载电流。通过消除实际负载电流依赖性，所提出的模型可以预测不同负载条件下 VSI 的最小直流电压纹波产量开关序列。所提出的模型在最佳开关序列引发方面的有效性在双逆变器配置上通过实验证明，考虑到两个逆变器开关导致的膨胀开关应力。