Neutral-point voltage control for a three-level DC-AC inverter using equivalent-input-disturbance approach

• 作者: Jie ZHANG Jinhua SHE Ryuichi YOKOYAMA Win WU
• 来源期刊: 电力系统保护与控制
• 学科: 工学
• 关键词: inverter multi-level neutral-point voltage EID disturbance
• 年，卷（期）: 2013,（1）
• 页码范围: 183-189
• 分类号: TM464
• 语种: 中文

摘要

One problem with a single source three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutral-point voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a low level and reduces the capacity of DC-link capacitors. Simulation results show the effectiveness of the method.