分层接入方式下锡泰特高压直流输电系统阀组电压平衡控制  

Voltage Balance Control of Valves in Hierarchical Connection Mode for Ximeng-Taizhou UHVDC System

作　　者：郭宏光 吴彦维 陈大鹏 王亚涛 李楠 周晓风 GUO Hongguang;WU Yanwei;CHEN Dapeng;WANG Yatao;LI Nan;ZHOU Xiaofeng(XJ Electric Co.Ltd.,Xuchang 461000,China)

机构地区：[1]许继电气股份有限公司,河南省许昌市461000

出　　处：《电力系统自动化》2019年第2期176-181,共6页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2016YFB0900600);国家电网公司科技项目(52094017000W)~~

摘　　要：锡盟—泰州±800kV特高压直流输电工程,采用分层接入的方式,在泰州换流站分别接入1 000kV和500kV交流电网。在这种新型电路结构下,如何保证单极中接入不同电压等级交流电网的两个串联阀组的直流电压均衡,对于直流输电系统的安全稳定运行是非常重要的。结合锡盟—泰州直流工程,在分析直流输电系统控制策略的基础上,对分层接入的阀组电压平衡控制进行研究,提出了电压平衡控制策略和中点分压器容错处理方法。通过RTDS建模试验验证了控制策略的正确性,并在锡盟—泰州特高压直流工程获得应用。±800kV ultra-high voltage direct current(UHVDC)transmission project from Ximeng to Taizhou is hierarchically connected to 1 000 kV and 500 kV AC grid in Taizhou converter station.As for this new circuit structure,it is very important how to ensure the DC voltage balance of two series valve groups connected to different voltage level AC grid in one pole for the safe and stable operation of HVDC transmission system.Combined with the UHVDC project from Ximeng to Taizhou,on the basis of the analysis of the control strategy of the DC transmission system,the voltage balance control of the series valve groups is studied,and the control strategy of voltage balance and the fault tolerance method of middle point divider are put forward.The RTDS modeling test verifies the correctness of the control strategy and achieves good application results in the HVDC project from Ximeng to Taizhou.

关 键 词：特高压直流 分层接入方式 控制系统 电压平衡控制 预测型熄弧角控制 定电流控制 定电压控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]