非正交坐标系多电平SVPWM及其在DVR中的应用

动态电压调节器(DVR)被认为是治理电压暂降的最好选择，备受国内外研究者的关注。针对高电压、大功率DVR补偿的技术需要，本文提出了一种基于多电平逆变器的无串联变压器型DVR，它能直接将缺损电压注入电网。文中简要介绍了这种DVR的组成部分和工作原理。在开关调制环节中，针对常规多电平SVPWM算法复杂、处理过程长这一突出缺点，首次提出了一种新型非正交坐标系多电平SVPWM统一简化算法。最后，通过仿真实验证明了该简化算法的正确性。由此可见，它在大功率DVR应用中具有显著提高治理瞬态电压质量问题的能力。

Multilevel SVPWM of Nonorthogonal Coordinates and its Application in Dynamic Voltage Regulator

Dynamic Voltage Regulator(DVR) is looked on as the most effective method for voltage sags control,so it draws much attention of electrical engineers home and abroad.According to the need of high voltage compensation,this article proposes a new kind of transformerless DVR based on multilevel-inverter,which can adds voltage directly to the power system, then we give a brief introduction to every part of this kind of DVR and its work principle as well.In modulation section,because of the complication of normal multilevel SVPWM algorithm,this article originates a new kind of nonorthogonal coordinates and a simplified unified multilevel SVPWM algorithm,based on the proposed nonorthogonal coordinates.Finally we demonstrate the validity of the algorithm and its effect in voltage sags control.