Modeling method of sequence admittance for three-phase voltage source converter under unbalanced grid condition

• 作者: Meng HUANG Xiaoming ZHA Yang CEN
• 来源期刊: 现代电力系统与清洁能源学报(英文)
• 学科: 工学
• 关键词: Unbalanced GRID VOLTAGE THREE-PHASE VOLTAGE source converter Harmonic LINEARIZATION Positive and negative SEQUENCE ADMITTANCE Stability
• 年，卷（期）: 2018,（3）
• 页码范围: 595-606
• 页数: 12页
• 分类号: TM46

摘要

The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters(VSCs) especially in grid-connected mode.However, the sequence admittance is hard to calculate when the VSC is operating under unbalanced grid voltage conditions. In this paper, a simple and direct modeling method is proposed for a three-phase VSC taking the unbalanced grid voltage as a new variable for the system.Then coupling in the three-phase system can be calculated by applying the harmonic linearization method. The calculated admittance of three-phase VSCs is verified by detailed circuit simulations.