改进的多电平SVPWM及其广义算法研究

调制技术是多电平逆变器的核心技术，基于非正交KL坐标系多电平SVPWM，通过对原结论进一步的综合分析，提出了一种改进的线电压调制策略，该策略物理意义更加明确，形式更加简洁。利用基本电路原理，通过合理安排输出矢量，得到了一种改进的三相对称的单相调制算法；结合冲量等面积原理，导出了可以满足三相不对称情况输出的广义调制策略。所提出的调制算法，形式简单，物理概念明确，易于数字化实现。通过数字仿真及实验证明了结论的正确性。

An Improved Multilevel SVPWM and Its Generalized Algorithm

The modulation is the key technique for multilevel inverter, an improved line voltage modulation strategy is proposed, which is based on the nonorthogonal KL coordinates SVPWM and makes some further comprehensive analysis on the original conclusions. The advantage of the strategy is that it has clearer physical meaning and more simple form. One improved three phases balance modulation algorithm for the single phase is got by the proper arrangement of output vectors taking advantage of the basic circuit theory; and then the generalized modulation strategy is deduced, which is suitable for three phases unbalance situation by the consideration of pulse area equal principle. This proposed modulation algorithm has simple format and clear physical concept, in addition, it's easy for the digital implementation. The digital simulations and experiments are presented to verify the conclusions.