CAJ | 학술논문

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。
환상실패시직류수전계통최상견적고장지일，실제운행중대다수환상실패시유교류계통고장인기적전압우동조성적。침대남방전망2012년4-8월계통운행중발생적궤기직류계통환상실패사건，기우직류역변참적 TFR 화 PMU록파수거，분석료고장기간직류전수적유공공솔화환류참교류모선전압적변화정황，득출남방전망초수、천엄、고조、흥안직류환상실패적유관규률，험증료일충재궤전잠태방진중괄용적환상실패최저전압강락적실용판거。근거해판거평고료엄동경내50개500 kV 변전참출선고장대직류환상실패이급계통은정성적영향。
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.