A simple control strategy for balancing the DC-link voltage of neutral-point-clamped inverter at low modulation index

被引：0

作者：

Ma, CS ^{[1
]}

Kim, TJ ^{[1
]}

Kang, DW ^{[1
]}

Hyun, DS ^{[1
]}

机构：

[1] Hanyang Univ, Dept Elect Engn, Seoul 133791, South Korea

来源：

IECON'03: THE 29TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1 - 3, PROCEEDINGS | 2003年

关键词：

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper proposes a simple control strategy based on the discontinuous PWM (DPWM) to balance the DC-link voltage of three-level neutral-point-clamped (NPC) inverter at low modulation index. It introduces new DPWM methods and one of them is used for balancing DC-link voltage. The current flowing through the neutral point of the DC-link causes the fluctuation of the DC-link voltage of the NPC inverter. The proposed DPWM method changes the path and duration time of the neutral point current and it makes the overall variation of the DC-link voltage zero during a sampling time of the reference voltage vector. Therefore, by using the proposed strategy, the voltage of the DC-link can be balanced fairly well and its ripple is also reduced significantly. Moreover, comparing with conventional methods that have to perform the complicated calculation, the proposed strategy is very simple. The proposed DPWM method is verified by experiment.

引用

页码：2167 / 2172

页数：6

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