摘要
为了满足直流断路器的开断容量,通常在系统中串接限流电抗器来降低故障电流,但会改变系统的故障特性。针对某±10 kV三端柔性直流配电系统开展限流电抗器参数对系统保护动作时间影响的研究。在PSCAD中建立其仿真模型;通过保持系统保护配置不变,只改变限流电抗器参数来仿真分析限流电抗值对换流站和直流变压器保护动作时间的影响。研究结果表明,随着系统限流电抗值增大,桥臂差动保护不受影响,多端柔性直流配电系统继续稳定运行;直流过电流保护动作时间和解除时间均延后;缩短非故障换流站的闭锁持续时间,可提高系统的供电可靠性,但也会导致系统稳定性下降等问题。
In order to meet the breaking capacity of the DC circuit breaker,a current-limiting reactor is usually connected in series in the system to reduce the fault current,but it will change the fault characteristics of the system.For a±10 kV three-terminal flexible DC power distribution system,a research on the influence of current-limiting reactor parameters on the protection action time of the system was carried out.The simulation model was established in PSCAD;by keeping the system protection configuration unchanged,only the current-limiting reactor parameters were changed,and then the impact of the current-limiting reactor value on the protection action time of the converter station and DC transformer was simulated and analyzed.The research results show that:as the current-limiting reactance value of the system increases,the bridge arm differential protection is not affected,and the multi-terminal flexible DC distribution system continues to operate stably;the DC over-current protection action time and release time are delayed;the blocking duration of non-fault converter station can be shortened and the power supply reliability of the system can be improved,but the stability of the system will also be reduced.
作者
郑文博
韩永霞
高毓群
冯帅松
郑雅玲
张杰
Zheng Wenbo;Han Yongxia;Gao Yuqun;Feng Shuaisong;Zheng Yaling;Zhang Jie(College of Electric Power, South China University of Technology, Guangzhou Guangdong 510641, China)
出处
《电气自动化》
2022年第1期50-53,共4页
Electrical Automation
基金
国家自然科学基金(51807068)。
关键词
柔性直流配电系统
限流电抗器
保护动作时间
桥臂差动保护
桥臂过流保护
直流过电流保护
flexible DC distribution system
current limiting reactor
protection action time
bridge arm differential protection
bridge arm over-current protection
DC over-current protection
