A novel capacitor voltage balancing method for an improved MMC circuit with three-level middle modules

2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC) Pub Date : 2015-12-21 DOI:10.1109/IFEEC.2015.7361562

Teng Liu, Jinjun Liu, Sixing Du

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Abstract

Modular multilevel converter (MMC) has become a promising multilevel topology for high-power applications in recent years. This paper proposes a novel capacitor voltage balancing method for an improved MMC circuit with a three-level neutral-point-clamped (NPC) module connected upper arm to lower arm in each phase, which possesses the merit of saving two half-bridge sub-modules (SMs) for each phase compared with the conventional MMC topology when generating the same number of output voltage levels. To make sure that the output voltage of this novel MMC keeps the same with that of the conventional MMC, this paper combines phase-shift carrier PWM (PS-PWM) with phase-opposition-disposition carrier PWM (POD-PWM) as the modulation strategy. Further, the proposed capacitor voltage balancing method based on adjusting the modulation wave mainly focuses on the neutral point voltage balancing of the NPC module and the voltage balancing between the NPC module and arms. Simulation results verify the effectiveness of the proposed capacitor voltage balancing method.

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一种新型三电平中间模块改进MMC电路的电容电压平衡方法

近年来，模块化多电平变换器(MMC)已成为一种很有前途的大功率多电平拓扑结构。本文提出了一种改进的MMC电路的电容电压平衡方法，该电路采用三电平中性点箝位(NPC)模块，每相连接上臂和下臂，与传统的MMC拓扑结构相比，在产生相同数量的输出电压电平时，每相节省两个半桥子模块。为了保证MMC的输出电压与传统MMC的输出电压保持一致，本文将相移载波PWM (PS-PWM)和相对配置载波PWM (POD-PWM)相结合作为调制策略。进一步，本文提出的基于调制波调节的电容电压平衡方法主要关注NPC模块的中性点电压平衡以及NPC模块与手臂之间的电压平衡。仿真结果验证了电容电压平衡方法的有效性。

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2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)

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