基于短路早期检测的中压故障电流快速限制技术  

Short circuit current limiting technology based on early detection for mid-voltage system

作　　者：缪希仁[1] 李飙[1] 吴晓梅[1] 鲍光海[1] 吴守龙[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电力自动化设备》2014年第11期75-81,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51377023);福建省科技厅重大项目(2011H6013)~~

摘　　要：为了提高故障电流限制器(FCL)在中压系统中的性能,提出基于短路电流早期检测的故障限流技术。在建立中压配电短路故障仿真模型的基础上,提出利用Mallat多尺度分辨小波变换实现短路电流早期检测。以中压动态模拟系统为对象,验证了中压短路电流早期检测的有效性。以串联谐振型FCL为例,分析对比了基于常规短路判据与早期检测的故障限流效果;以断路器分断苛刻度为指标,分析早期短路检测对故障分断能力的影响。仿真分析表明,基于短路电流早期检测的故障限流技术性能良好。A fault current limiting technology based on early short circuit detection is proposed to improve the performance of FCL（Fauh Current Limiter） for mid-voltage system. A fault simulation model of mid-vohage power distribution system is built and the Mallat multi-scale wavelet transform is applied to realize the early short circuit detection. Its effectiveness is verified by taking the mid-voltage dynamic simulation system as the object. With the series resonant FCL as an example,the short circuit current limiting effect is compared between the conventional and the proposed short circuit detection methods. With the breaking severity of circuit breaker as an indicator,the influence of early short circuit detection on the breaking capability is analyzed and the simulative results show its better breaking performance.

关 键 词：中压系统 配电 短路电流 小波变换 故障检测 早期检测 故障电流限制器 分断苛刻度 

分 类 号：TM713[电气工程—电力系统及自动化]