三电平调制下中性点箝位变换器中性点平均限流分析

IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society Pub Date : 2020-10-18 DOI:10.1109/IECON43393.2020.9255382

Zhuolin Jiang, N. Beniwal, S. Ceballos, J. Pou, H. D. Tafti, G. Farivar

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引用次数: 1

摘要

用于双极直流母线、背对背变换器、功率补偿器等应用的中性点箝位(NPC)变换器在一定的工作条件下需要非零平均中性点(NP)电流注入。为了更好地实现平均NP电流注入，本文研究了NPC变换器可以注入的最大和最小平均NP电流。本研究采用三电平调制技术，选择其中一相在直流正轨和直流负轨之间切换，另两相在两个连续电压电平中切换。分析了不同负载条件下的最大和最小平均NP电流注入极限。本研究还评估了调制指数和工作功率因数对极限的影响。

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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Analysis of the Average Neutral-Point Current Limits of the Neutral-Point-Clamped Converter Under Three-Level Modulation

The neutral-point-clamped (NPC) converter employed in applications like bipolar dc-bus, back-to-back converters, power compensator, etc., requires a nonzero average neutral-point (NP) current injection under certain operating conditions. In order to better implement the average NP current injection, this paper studies the maximum and minimum average NP current that can be injected with an NPC converter. For this study, a three-level modulation technique is employed in which one of the three phases is selected to switch between the positive dc-rail and the negative dc-rail while the other two phases switch in two consecutive voltage levels. The maximum and minimum average NP current injection limits are analyzed under different loading conditions. The presented study also evaluates the effects of modulation index and operating power factor on the limits.

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IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society

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