基于实际录波的南方电网多回直流换相失败分析  

Analysis on Commutation Failure of the CSG's HVDC Systems Based on Actual Waves

作　　者：赵利刚 赵勇 洪潮 徐光虎[2] 林庆标[2] 张帆 

机构地区：[1]南方电网科学研究院,广州510080 [2]中国南方电网电力调度控制中心,广州510623

出　　处：《南方电网技术》2014年第4期42-46,共5页Southern Power System Technology

摘　　要：换相失败是直流输电系统最常见的故障之一,实际运行中大多数换相失败是由交流系统故障引起的电压扰动造成的。针对南方电网2012年4-8月系统运行中发生的几起直流系统换相失败事件,基于直流逆变站的TFR和PMU录波数据,分析了故障期间直流传输的有功功率和换流站交流母线电压的变化情况,得出南方电网楚穗、天广、高肇、兴安直流换相失败的有关规律,验证了一种在机电暂态仿真中适用的换相失败最低电压降落的实用判据。根据该判据评估了广东境内50个500 kV变电站出线故障对直流换相失败以及系统稳定性的影响。Commutation failure is one of the very frequent dynamic events in HVDC transmission systems. Most of the commutation failures are caused by the voltage disturbances of AC grid. Aiming at several commutation failure events occurred in China Southern Power Grid（ CSG）,April to August 2012,and based on the TFR and PMU waves of DC inverter station,and analyzing the changes of AC bus voltage and active power of DC lines during the events,this paper obtains the relevant laws of commutation failure in CSG＇s HVDC systems,and proposes a practical criterion for commutation failure occurred in electromechanical transient simulation based on lower voltage sag. According to the criterion,the impact of the line faults occurred in the 50 substations of 500 kV in Guangdong on the DC commutation failure and system stability is evaluated.

关 键 词：高压直流输电 换相失败 实际录波 实用判据 

分 类 号：TM721.1[电气工程—电力系统及自动化]