Analysis and optimization of reactive power controllers of Voltage Source Converter in weak AC grid

被引：0
|
作者：
Yuan Y. [1 ]
Zhao C. [1 ]
Yuan B. [1 ]
Xu J. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
| 2016年 / Power System Technology Press卷 / 40期
基金：
中国国家自然科学基金;
关键词：
Participation factor; Reactive power control; Small signal analysis; Voltage source converter; Weak AC grid;
D O I：
10.13335/j.1000-3673.pst.2016.03.006
中图分类号：
学科分类号：
摘要：
Applicability analysis of reactive power controllers used in Voltage Source Converter (VSC) connected to weak AC grid is discussed and an improved reactive power control method is proposed in this paper. Firstly, rectifier/inverter system of VSC in weak AC grid is investigated, and small signal equivalent models of the two systems with constant active/reactive power control and constant active/AC voltage control are established respectively. Secondly, main physical parameters influencing dominant poles are analyzed with participation factor method, and then an improved reactive power control method proposed. The paper verifies the method in rectifier and inverter systems respectively, including analysis of parameter k selection. Finally, simulation models are established in PSCAD/EMTDC environment. Contrast between simulation and theoretical analysis verifies validity of small signal models. Considering operating limit of VSC system, critical active power transfer limits of the systems under different reactive power controls are analyzed. It is concluded that for VSC connected to weak AC grid, constant AC voltage control is more suitable for low SCR condition than reactive power control. With proper parameter k selection, both rectifier and inverter side systems with improved reactive power control are able to enhance critical active power and improve system stability effectively. © 2016, Power System Technology Press. All right reserved.
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页码：696 / 703
页数：7
相关论文
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