Fault Section On-Line Identification Algorithm with Limited PMU for Distribution Network
In order to realize fast fault section identification in distribution network with limited synchronous phase measurement unit(PMU)layout,an on-line fault section identification algorithm for distribution network with low PMU number dependence is studied.The PMU layout and area division principles are proposed,and the differences in the three-phase current between the normal area and the faulted area before and after the fault occurrence are analyzed.A multi-dimensional spatial and temporal state monitor-ing matrix is constructed using the collected current data,and a 2-parametric-based spectral parametric ratio coefficient is defined for dimensionality reduction of the multi-dimensional state monitoring matrix to quantify the differences in electrical state changes before and after the fault in each area,so as to achieve fast and accurate on-line fault location in the distribution network.In this paper,the effectiveness of the proposed method is verified by using IEEE 33-node distribution simulation system and 6-node actual test platform.The simulation results and actual test results show that the proposed method is less affected by the fault type,neutral grounding mode,and transition resistance under the limited PMU measurement information,and has certain noise immunity.The proposed method can quickly and accurately identify fault sections in the distribution network even in the case of asynchronous communication.
distribution networkspectral parametric numberphasor measurement unit(PMU)fault section identification