基于电流衰减因子的含DFIG配电线路保护方案  

Current Attenuation Factor Based Line Protection Scheme for Distribution Network of DFIG Wind Power Integration System

作　　者：段建东[1] 陈童 尚迪 崔帅帅 何鱼 DUAN Jiandong;CHEN Tong;SHANG Di;CUI Shuaishuai;HE Yu(School of Automation and Information Engineering,Xi'an University of Technology,Xi'an 710048,Shaanxi Province,China;Xi'an Communication Gas Corporation Ltd.,Xi’an 710075,Shaanxi Province,China;State Grid Shaanxi Maintenance Company,Xi’an 710065,Shaanxi Province,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西省西安市710048 [2]西安交通燃气有限责任公司,陕西省西安市710075 [3]国网陕西省电力公司检修公司,陕西省西安市710065

出　　处：《中国电机工程学报》2020年第6期1915-1923,共9页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0900600);国家自然科学基金项目(51877174);强电磁工程与新技术国家重点实验室(华中科技大学)开放课题基金(2018KF001)。

摘　　要：双馈感应风力发电机高渗透地分散并入配电网,呈现出与传统电源不同的电磁暂态特性,使得配电线路常规保护难以适应。该文首先推导双馈风机暂态电流表达式,据此分析配电线路区内、外故障时线路两端短路电流在衰减方面的特征差异。提出基于电流衰减因子的含双馈风机配电线路保护新原理,并通过Prony算法构造线路保护实用判据。以某10kV地方电网分散接入双馈风电示范性工程为原型,构建PSCAD仿真模型。大量测试结果表明:所提线路保护方法在不同故障类型、故障位置、风机容量等条件下能可靠地判别被保护线路的区内外故障,且灵敏度较高。Because of the high permeability of the distributed doubly-fed induction generator(DFIG)in the distribution network and its different electromagnetic transient characteristics from the conventional power supply,the existing protection is difficult to adapt to the distribution lines of DFIG wind power integration system.Through the analysis of the general expression of the fault current by DFIG,the difference in characteristics of the transient current between the two ends of the protected line is found.Based on this,a new protection principle of distribution line of DFIG wind power integration system was proposed,and protection scheme based on current attenuation factor was constructed by Prony algorithm.At last,based on a 10 kV local grid of DFIG wind power integration system as prototype,a PSCAD simulation model was build.A large number of tests show that the proposed line protection can identify the faults reliably and sensitively with different fault type,fault position,DFIG capacity and other conditions.

关 键 词：双馈感应风力发电机(DFIG) 电流衰减因子 配电线路保护 PRONY算法 

分 类 号：TM77[电气工程—电力系统及自动化]