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一种降低共模电压并消除中点电压直流偏置的新型三电平NPC变换器不连续调制策略

A Novel Discontinuous Modulation Strategy With Reduced Common-Mode Voltage and Removed DC Offset on Neutral-Point Voltage for Neutral-Point-Clamped Three-Level Converter

语言:

中文摘要

本文提出了一种针对中点钳位(NPC)三电平变换器的新型不连续脉宽调制(DPWM)策略,命名为RCMV_DPWM。该策略在降低开关损耗的同时,能有效抑制共模电压(CMV),并消除中点电压的直流偏置。通过基于降低CMV的空间矢量图分析,实现了所有钳位模式的优化。

English Abstract

In this paper, a novel discontinuous pulsewidth modulation (DPWM) modulation strategy for a neutral-point-clamped (NPC) three-level converter (TLC) is proposed to reduce the switching loss, reduce common-mode voltage (CMV), and remove dc offset from the neutral-point (NP) voltage simultaneously, which is named as RCMV_DPWM. Based on the space vector diagram with reduced CMV, all clamping modes und...
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SunView 深度解读

该研究直接针对阳光电源核心产品线——集中式光伏逆变器及大型储能变流器(如PowerTitan系列)中广泛使用的三电平NPC拓扑。通过优化DPWM策略,该技术能显著降低大功率变换器的开关损耗,提升整机效率,同时抑制共模电压以减少漏电流,这对提升光伏逆变器在复杂电网环境下的电磁兼容性(EMC)表现至关重要。建议研发团队在后续的高功率密度逆变器设计中引入该调制算法,以优化散热设计并降低中点电压波动,从而提升系统长期运行的可靠性。