摘要
为了更准确地评估交直流电力系统安全稳定性,有必要对换相失败和功率恢复过程中交直流系统相互作用和影响的规律进行探索。利用精确模拟直流输电系统主回路及其控制保护的仿真工具,针对南方电网中一个实际直流输电系统,对交流系统故障是否会引发逆变器换相失败的影响因素进行了分析评估。结果表明,交流系统中发生的三相短路或单相接地故障是否导致直流输电逆变器发生换相失败,主要取决于换流母线三相或单相电压跌落的幅度。
In order to evaluate the security and stability of AC/DC hybrid power systems,it is necessary to explore the interaction between the DC transmission systems and the embedded AC system during commutation failure and DC power recovery.By using a real-time simulaton tool,which can precisely simulate the DC main circuit and its control and protection system,and taking an actual HVDC system in China Southern Power Grid as a test case,this paper evalutes the influence factors on the occurrence of commutation failure of inveter after AC system faults.The results show that the magnitude of three-phase or single-phase voltage drop is the key factor for the occurrence of commutation failure of DC system after three-phase or single-phase to ground faults occur.
出处
《南方电网技术》
2011年第1期1-7,共7页
Southern Power System Technology
关键词
直流输电
换相失败
功率恢复
实时仿真
DC transmission
commutation failure
power recovery
real-time simulation.
