Neutral-Point Current Modeling and Control for Neutral-Point Clamped Three-Level Converter Drive with Small DC-Link Capacitors

被引：0

作者：

Maheshwari, RamKrishan ^{[1
]}

Munk-Nielsen, Stig ^{[1
]}

Busquets-Monge, Sergio ^{[2
]}

机构：

[1] Aalborg Univ, Dept Energy Technol, Aalborg, Denmark

[2] Tech Univ, Dept Elect Engn, Barcelona, Spain

来源：

2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2011年

关键词：

MODULATION;

D O I：

暂无

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A Neutral-Point-Clamped (NPC) three-level inverter with small DC-link capacitors is presented in this paper. This inverter requires zero average neutral-point current for stable neutral-point potential. A simple carrier based modulation strategy is proposed for achieving zero average neutral-point current. A new simplified model of the neutral-point voltage dynamics is derived for the proposed modulation strategy. This model shows that the neutral-point current is proportional to the power drawn from the converter and it enables the use of well established classical control theory for neutral-point voltage controller design. A PI controller is used for neutral-point voltage balance. The implementation of the proposed modulation strategy and controller is simple. It does not require any information about the output phase currents. The controller is implemented in a 7.5 kW induction machine based drive with only 14 mu F DC-link capacitors. A fast and stable performance of the neutral-point voltage controller is achieved and verified by experiments.

引用

页码：2087 / 2094

页数：8

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