电流相位变化量纵联保护方案  

The Current Phase Variation Pilot Protection Method

作　　者：许偲轩 陆于平[1] 

机构地区：[1]东南大学电气工程学院,南京210096

出　　处：《电工技术学报》2016年第16期198-206,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50977012;51377022)

摘　　要：电流纵联差动保护是理论上解决分布式发电配网保护问题的有效手段。限制差动保护在含分布式电源(DG)配网中应用的主要原因是配网通信自动化水平较低,采样值同步具有较大的同步误差,而电流差动保护相移制动能力较差,在高同步误差前提下保护安全性较低。针对中低压等级分布式发电配网,提出一种利用故障前后电流相位变化量比较的纵联保护方案,保护信息交换对同步条件要求较低,有很强的耐受同步误差能力。受益于中低压配电线路的高对地容抗参数,新方案具有良好的制动性能,能够满足分布式发电环境下保护选择性的需要。与传统纵联差动保护相比,最大的优势在于省去采样值同步环节,相移制动能力强,实用性好。同时还提出了适用于新方案的数据获取方法和保护启动策略,进一步系统化保护方案。仿真结果说明新方案具有良好的制动性能以及耐同步误差能力,解决分布式发电配网保护问题优势明显。Current differential protection is one of the most effective protection methods in distributed generation system. However, the low communication constructing level in distribution system limits the application of differential protection. Since traditional differential protection requires low synchronization error, the safety of distribution system is hardly guaranteed. In this paper, a new differential method based on current phase variation is proposed, in which the sampling synchronization is no longer necessary. Thanks to the high capacitive reactance of distribution line, the new method shows good brake performance, which satisfies the protection requirements of distributed generation system. For its immunity to synchronization error, the new method is more adaptable than traditional differential protection. Furthermore, this paper also describes the supporting data acquisition method and protection pickup method. Finally, the criterion braking characteristic and phase shift restraint capacity are simulated.

关 键 词：分布式发电 电流相位变化量 纵联保护 同步误差 配网保护 

分 类 号：TM77[电气工程—电力系统及自动化]