Power Flow Calculation And Analysis System For Line Losses Of Distribution Network&Software Development

Distribution power flow calculation software is the foundation of distributionnetwork’s analysis, is basic calculation software of power optimization scheduling andnetwork topology structure analysis. At the same time line losses analysis software ofdistribution network can also reflect the line losses of power, has great significance toimprove the power efficiency and save energy. The research of this paper belongs to partof contents of research project "network application" by Harbin electric group A Chengrelay Co. Ltd. Research is focused on developing the function module of distributionmaster station system effectively, which can realize efficient power flow calculation, linelosses calculation and short circuit current calculation of distribution network.This paper first introduces the overall design scheme of RE8000AJI distributionmaster station system, include the construction principle, hardware configuration andsoftware architecture, and describes the function of the station system.Secondly, based on the structural characteristics of distribution network, considerthe imbalance of the system load, therefore build three-phase mathematical model, whichcontains the distribution feeder, power distribution transformer and distribution of load.Finally, do research the power flow using hierarchical numbering for radialdistribution network in detail, and use the principle of compensation to improve, to makeit be applied to the distribution network which has less ring structure. At the same time,this paper deduces in detail for the principle of current injection Newton method, In theiteration does mathematical deformation for the formation of the Jacobian matrix,reduces the amount of computation in power flow calculation of Newton method.In this paper, the two algorithms are extended to three-phase power flow, andthrough the different test systems, including transformer model, radial distributionnetwork structure and ring distribution network structure, does simulation and algorithmcomparison of two algorithms.