Design And Realization Of Three-phase Power Flow For Distribution Network

Three phase power flow of distribution network is an important foundation for the power system analysis.There are a lot of asymmetric operation conditions in distribution network,such as single phase load and three-phase unbalanced load.So single phase power flow may cause a large error,and the three-phase power flow can solve this problem well.The line model,transformer model,capacitor model and load model of three-phase power flow calculation are derived and established.There are many types of three-phase power flow.In many power flows,the convergence of the Newton method is better.The Newton method is chosen as the three phase power flow algorithm.According to the ungrounded distribution network,the calculation formula of three-phase power flow is derived.On the basis of the existing research,according to the needs of the project,the following improvements are made to the original algorithm:power initial value setting,constant impedance PQ endpoint processing and how to select the control variables.Three-phase power flow software is designed,and the circuit data structure,data structure,capacitor data structure,load data structure and output data structure of the algorithm are designed.The algorithm module of three-phase power flow software is designed by the system admittance matrix design,the system power matrix design and the algorithm flow.In order to make the output data visualization,three-phase power flow software is designed and implemented.The capacitor reactive power compensation is designed to improve the unbalanced degree of three-phase voltage and the large voltage drop caused by the reactive power of the system.Using MATLAB implementation of the corresponding procedures and Using GUI implementation of the three-phase power flow software.The results show that the proposed algorithm is correct and effective,and the results show that the proposed algorithm is effective and practical.