龙政直流闭锁事件分析及降压再启动直流电压偏高抑制  

Bipolar Block Analysis and Inhibition of Higher Voltage at Restarting in Reduced Voltage Mode for Longquan-Zhengping DC Transmission System

作　　者：雷霄[1] 王明新[1] 王华伟[1] 杨鹏[1] 李新年[1] 

机构地区：[1]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2013年第8期129-133,共5页Automation of Electric Power Systems

基　　金：国家电网公司大电网重大专项资助项目(SGCC-MPLG001-2012)~~

摘　　要：在对2011年7月30日龙政直流输电系统双极闭锁事件原因进行分析的基础上,对极Ⅰ直流线路故障后降压再启动不成功导致闭锁的过程进行了详细研究。根据实际控制保护系统的逻辑,分析发现此问题的根本原因是理想空载直流电压无法快速变化。提出了根据实测数据实时计算整流站和逆变站触发角限值的方法,对电压和电流调节器的输出进行相应优化,以抑制降压再启动过程中的电压偏高问题。对与实际工程一次系统及控制保护程序相一致的仿真模型进行测试,证明了优化逻辑的可行性和有效性。Through the analysis of bipolar block of Longquan-Zhengping direct current（DC） transmission system at July 30,2011,the block resulting from the restart failure of pole Ⅰ in reduced voltage mode after faults is studied.According to the logic of the actual control protection system,the root cause of this problem is that the ideal no-load DC voltage can not change rapidly.A modification method based on the real-time calculating of the firing angle limit at the rectifier and inverter station with measured data is proposed to optimize the output of voltage and current regulator,and to solve the matter of higher voltage at restarting in reduced voltage mode.Series tests of this new method have been made based on the simulation model which is the same as the actual DC system and prove its feasibility and effectiveness.

关 键 词：直流输电 双极闭锁 降压再启动 控制保护系统 

分 类 号：TM73[电气工程—电力系统及自动化]