配电线路电流保护的跌落保护性能评估  

Evaluations of Sag Mitigation Capability to Distribution Line Current Protection

作　　者：王宾[1] 潘贞存[2] 徐文远[2] 董新洲[1] 

机构地区：[1]清华大学电机系电力系统国家重点实验室,北京市100084 [2]山东大学电气工程学院,山东省济南市250061

出　　处：《电力系统自动化》2006年第6期25-29,41,共6页Automation of Electric Power Systems

摘　　要：系统中大部分电压跌落由故障引起,快速可靠地判断并切除故障是继电保护的主要职责。然而,目前的电压跌落治理方案均缺乏对继电保护技术的评价和应用。文中将三段式电流保护动作特性引入CBEMA(Computer Business Equipreent Manufacturing Association)敏感特性曲线中,提出了电流保护的电压跌落安全域评估模型及保护性能评估模型,有效地衡量了线路电流保护可以提供给敏感设备安全运行的有效区域以及最大电压跌落保护能力。相关理论与算例分析表明,继电保护技术可以提供一定的电压跌落治理能力;改善电流保护的电压跌落保护性能,只能从增大无时限电流速断(I段)保护的保护范围入手。Main duties of relay protection are correctly and quickly judging and clearing system faults, which greatly derive voltage sags in a distribution system. Whereas, it is less reported for the evaluation and application of sag mitigation capabilities to relay protection. By introducing the protection operation characteristic into the CBEMA （Computer Business Equipment Manufacturing Association） curve, the secure work region of sensitive equipment under voltage sags and the sag mitigation capabilities provided by current protection under system faults are presented and modeled. And then the maximum sag protection capabilities of current protection and the size of the secure work region can be achieved. Theoretical analysis and simulations prove that sag mitigation with relay protection is valid. Also, it is concluded that the only effective improvement is the extension of the instantaneous relay protection zone.

关 键 词：配电系统 电压跌落 电流保护 跌落治理 

分 类 号：TM773[电气工程—电力系统及自动化] TM727.2