采用三电平ANPC变换器使视开关频率自然倍增

D. Floricau, E. Floricau, M. Dumitrescu
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引用次数: 87

摘要

3L-NPC(三电平中性点箝位)是大功率中压应用中最流行的多电平变换器。这种结构的一个重要缺点是开关之间的损耗分布不均匀。通过开发具有更大自由度的3L-ANPC (Active-NPC)变换器,提高了3L-NPC结构的性能。本文研究了不同PWM策略下的开关状态和损耗分布问题。本文还提出了一种新的PWM策略。它有许多优点:(a)在不使用飞电容概念的情况下,表观开关频率自然翻倍;(b)在占空比的50%时,死区时间不会影响工作模式;(c)在不进行结构修改的情况下,可以在高和小开关频率下工作;(d)更好地平衡开关中的损耗分布。为了验证所提出的PWM策略和开关状态的分析,给出了PSIM仿真结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Natural doubling of the apparent switching frequency using three-level ANPC converter
The 3L-NPC (three-level neutral-point-clamped) is the most popular multilevel converter used in high-power medium-voltage applications. An important disadvantage of this structure is the unequal distribution of losses among the switches. The performances of 3L-NPC structure were improved by developing the 3L-ANPC (Active-NPC) converter which has more degrees of freedom. In this paper the switching states and the loss distribution problem are studied for different PWM strategies. A new PWM strategy is also proposed in the paper. It has numerous advantages: (a) natural doubling of the apparent switching frequency without using the flying-capacitor concept, (b) dead times do not influence the operating mode at 50% of the duty cycle, (c) operating at both high and small switching frequencies without structural modifications and (d) better balancing of loss distribution in switches. The PSIM simulation results are shown in order to validate the proposed PWM strategy and the analysis of the switching states.
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