Distribution Line Loss Calculation And Power Loss-Reduction Studies

Energy loss in power grids referred to line loss, is an important technical and economic indicators of power supply enterprises. How to effectively reduce the grid power loss and improve the economic efficiency of enterprises is an urgent issue at all levels. To reduce the line loss further, more accurate theoretical line loss calculation is needed, and the calculation results would provide theoretical reference for safe and economic operation of distribution network and the strengthening of the line loss management.This paper analyzes traditional line loss calculation algorithms and their associated computing performance and errors. The paper uses the load flow algorithm suitable for distribution network characteristics (forward/backward method). In order to improve the accuracy of the calculation, the introduction of PQU load curve is brought in and is used to calculate three-phase power flow, and it is feasible via example analysis. This paper calculates the extra loss of three-phase unbalanced distribution network. Compared with the loss of three-phase balanced in the same line, the three-phase unbalance in the distribution network can’t be ignored, which is not considered in traditional methods. In this paper, the iterative calculation of forward/backward method contains the loss of changing voltage, and improves the assumptions of the traditional algorithms and makes more accurate calculation.Technical measures aiming for line loss reduction are discussed in the paper. Due to high transformer loss in the total loss of distribution network, loss incurred due to tri-phase unbalance cannot be ignored. In this paper, the data from actual distribution network are used in line loss calculation, it is proved that the proposed method is effective and feasible. Finally, the corresponding loss-reducing measures are proposed, and simulation results illustrate its feasibility.