摘要
分布式电源DG(distributed generation)并网后,配电网变为两端/多端电源网络,传统基于单向潮流的故障定位方法不再适用,为此提出一种基于改进Karrenbauer变换的有源配电网故障定位新方法。首先针对因配电网不换位造成参数阻抗矩阵中心对称的特点,对阻抗矩阵进行标准Karrenbauer变换增加矩阵的稀疏性;在此基础上,对初步变换矩阵做进一步对角化处理获取修正矩阵,进而得到可实现不换位配电网三相高精度解耦的相模变换矩阵,即改进Karrenbauer矩阵。通过分析相模变换后α模故障附加电流相角差,推导出有源配电网区段故障定位的判据。通过算例分析验证了所提方案可以实现故障区段的准确定位,解决了线路参数不对称对配电网故障定位精度的影响。
With the access of distributed generations(DGs),distribution network turns into a two-or multi-end power source network.As a result,the traditional fault location method based on one-way power flow is no longer applicable.In this paper,a new fault location method for active distribution network is proposed based on the improved Karrenbauer transform.First,in light of the characteristics of center symmetry of impedance matrix due to the non-displacement of distribution network,the standard Karrenbauer transform is performed on the impedance matrix to increase its sparseness;on this basis,diagonalization is further performed on the preliminary transform matrix to obtain a correction matrix;furthermore,a phase-mode transform matrix that can realize three-phase high-precision decoupling of the non-displacement distribution network,i.e.,the improved Karrenbauer matrix,is acquired.By analyzing the phase-angle difference in theα-mode fault component current after the phase-mode transform,the criteria for the sector fault location of active distribution network is derived.The result of a numerical example shows that the proposed method can accurately locate the fault section,thus avoiding the influence of asymmetry of line parameters on the fault location accuracy of distribution network.
作者
姜惠兰
陈娟
张驰
JIANG Huilan;CHEN Juan;ZHANG Chi(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2018年第11期39-43,共5页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51477115)
