Voltage Stability of Converter Buses of UHVDC Hierarchical Connection to AC grid

被引：0
|
作者：
Fu R. [1 ]
Zhou Z. [1 ]
Tang Y. [2 ]
Chen B. [2 ]
Sun W. [1 ]
Wu Y. [1 ]
机构：
[1] College of Automation, Nanjing University of Posts and Telecommunications, Nanjing
[2] School of Electrical Engineering, Southeast University, Nanjing
来源：
Gaodianya Jishu/High Voltage Engineering | 2017年 / 43卷 / 12期
基金：
中国国家自然科学基金;
关键词：
DC control mode; Hierarchical connection mode; Reduced order Jacobian matrix; UHVDC; Voltage stability factor;
D O I：
10.13336/j.1003-6520.hve.20171127038
中图分类号：
学科分类号：
摘要：
An ultra HVDC hierarchical connection mode proposed by domestic scholars can improve the capacity of receiving end power grid to accept DC power. How to analyze the voltage stability of converter buses of 500 kV layer and 1 000 kV layer near landing points is urgent and needs to be studied further. Consequently, we analyze firstly the power output characteristic of inverters of different layers according to a mathematical model of the new connection mode, and derive a numerical calculation method of comprehensive voltage stability factor by using the reduced order Jacobian matrix to evaluate voltage stability of converter buses. It is shown that being granter than and closer to zero of the factor indicates the better stability of converter buses. Furthermore,the voltage stability of converter buses under various DC control modes is studied by using the factor, and the sort of voltage stability is obtained. It can be seen from the sort that when the rectifier with constant current control or constant power control and the high- and low- end inverters of inverter station are adopted,,the constant voltage control has the best voltage stability as the factor is 0.341 0; when the rectifier with constant power control and the high- and low- end inverters of inverter station are adopted,the constant extinction angle control has the worst as the factor is 0.672 8. The effect of the transmission power on voltage stability is also investigated. The conclusion are that change of control mode form constant power to constant current for rectifier and change of control mode from constant extinction angle to constant voltage for the two inverters of inverter station can both improve voltage stability of converter buses near landing points, and relatively low transmission level of DC power are benefit to the voltage stability. Finally, simulation based on Ximeng-Taizhou UHVDC project shows the analytical method of this paper is reasonable and effective. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：4103 / 4111
页数：8
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