高电压技术2017，Vol.43Issue(12)：4103-4111,9.DOI:10.13336/j.1003-6520.hve.20171127038
特高压直流分层接入方式下换流母线电压的稳定性
Voltage Stability of Converter Buses of UHVDC Hierarchical Connection to AC grid
摘要
Abstract
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.关键词
特高压直流输电/分层接入方式/直流控制方式/降阶雅克比矩阵/电压稳定性因子Key words
UHVDC/hierarchical connection mode/DC control mode/reduced order Jacobian matrix/voltage stability factor引用本文复制引用
付蓉,周振凯,汤奕,陈斌,孙万钱,吴英俊..特高压直流分层接入方式下换流母线电压的稳定性[J].高电压技术,2017,43(12):4103-4111,9.基金项目
国家自然科学基金(51577030 （）
61503197) （）
国家电网公司科技项目(XT71-15-0450) （XT71-15-0450）
江苏省电力公司科技项目(5210EF14001P).Project supported by National Natural Science Foundation of China (51577030,61503197),Science and Technology Project of SGCC (XT71-15-0450),Science and Technology Project of Jiangsu Electric power Company (5210EF14001P). （5210EF14001P）
