利用过程免疫时间优化保护的电压暂降缓减方案  

Voltage sag mitigation scheme using protection optimization with process immunity time

作　　者：李丹丹[1] 肖先勇[1] 刘阳[1] 李铁牛 刘旭娜[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]深圳市海亿达能源科技股份有限公司,广东深圳518057

出　　处：《电力自动化设备》2014年第9期95-100,共6页Electric Power Automation Equipment

基　　金：国家教育部博士点基金资助项目(20130181110004);四川省科技支撑计划项目(2013GZ0062)~~

摘　　要：电压暂降对敏感过程的影响与导致暂降的故障电流、清除故障的保护定值以及过程暂降免疫力有关。引入过程免疫时间和用户可接受后果状态的概念,确定用户可接受的暂降持续时间,将过程免疫力分为3个等级。研究过程免疫时间与三段式电流保护定值之间的关系,提出通过利用过程免疫时间优化保护缓减电压暂降影响的方案。对IEEE 14节点配电系统、某实际含短线路配电系统和2种典型敏感过程进行仿真,验证了所提方法的正确性和有效性。结果证明,对于过程免疫时间较长的敏感过程,所提方法可有效缓减由Ⅱ段和Ⅲ段电流保护以及含短线路系统中由带延时的电流保护清除的故障所引起的电压暂降的影响。The influence of voltage sag on the sensitive process is related to the tault current winch induces the voltage sag,the protection setting which clears the fault and the process sag immunity. The concepts of PIT（Process Immunity Time） and acceptable outcome state are used to determine the user＇s acceptable sag duration. The process immunity has three levels. The relationship between the PIT and the settings of three-zone current protection is researched and a scheme to mitigate the voltage sag by the protection optimization with PIT is proposed. Simulations are carried out for IEEE 14-bus distribution system,a practical distribution system with short lines and two typical sensitive processes to verify the correctness and effectiveness of the proposed scheme. Results show that, the proposed scheme may effectively mitigate the influence of the voltage sags induced by the fault clearance actions of the current protections for zone-Ⅱ/-Ⅲ and the current protections with delay for systems containing short lines on the sensitive processes with long PIT.

关 键 词：敏感过程 电压暂降 免疫力 过程免疫时间 可接受后果状态 保护 优化 缓减措施 

分 类 号：TM712[电气工程—电力系统及自动化]