Real-time line loss calculation method based on equivalent resistance of low voltage distribution network

Abstract

Due to the imperfect construction planning of low-voltage distribution network in the early stage and the line cutting for balanced load distribution in operation, the recorded information of topological relationship between stations and households is inconsistent with the reality, which brings great difficulties to the calculation of theoretical line loss of distribution stations. In this paper, a method of calculating the real time line loss based on equivalent resistance of distribution network is presented, and a set of equations about the resistance parameters of low voltage distribution network is established. The total least square method is used to solve the problem and the equivalent resistance of distribution network is obtained. Then the cluster method is used to realize the accurate identification of impedance parameters, and the line loss of the distribution transformer area changes with the user’s electricity situation in real time, which helps the power supply company to screen the abnormal condition of line loss. Finally, the time series data collected by the smart meter in the actual power grid is verified, and the intraday real-time line loss curve of the distribution transformer area is obtained. The proposed method does not depend on the topology structure of distribution network, and can be used to calculate the actual line loss of low-voltage station according to the measurement data, which has higher effectiveness and feasibility.