Modulation of Two Parallel-Connected Converter with Reduced Circulating Current

R. Maheshwari, T. Ebel
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Abstract

Two parallel-connected converters are preferred to improve ac-side current ripple, thermal management, power capability, maintainability of the system. The two-parallel connected converters may be modulated considering the system as a single three-level (3L) converter. Therefore, the 3L space vector PWM may be used to reduce the ac-side current ripple. This is done by applying the three nearest vectors in an equivalent 3L space vector diagram. However, a high frequency circulating current is present in the ac side which depends on the difference between the common-mode (CM) voltages generated by the individual converters. The CM voltage difference is analyzed in this paper. Using this analysis, a modulation strategy is proposed to reduce the circulating current while applying the three nearest vectors in the equivalent 3L space vector diagram. The paper presents the carrier based implementation of the proposed method which is verified by simulation results.
减小循环电流的双并联变换器调制
为了改善系统的交流侧纹波、热管理、功率能力和可维护性,首选两个并联变换器。考虑到系统是一个单三电平(3L)转换器,可以对两个并联转换器进行调制。因此,3L空间矢量PWM可用于减小交流侧电流纹波。这是通过在等效的3L空间矢量图中应用三个最近的矢量来完成的。然而,高频循环电流存在于交流侧,这取决于由单个变流器产生的共模(CM)电压之间的差异。本文对CM电压差进行了分析。在此基础上,提出了一种利用等效3L空间矢量图中的三个最近矢量来减小循环电流的调制策略。文中给出了基于载波的实现方法,仿真结果验证了该方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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