Calculation And Analysis Of Power Flow Of 6kV Distribution Network With Distributed Power Supply

With the problems of traditional centralized power generation,such as excessive transmission line,large line loss,voltage sag,pollution environment,difficult power supply for remote areas or rural,but the emergence of distributed power supply can effectively make up these defects.The distributed generation technology can miniaturize the energy system,and help users to adjust their own reality,so that the energy supply system can fully meet their needs,and improve the energy users actively participate in the energy reform of energy efficiency and environmental pollution decreasing.However,after the distributed generation is integrated into the distribution network,the distribution network will be affected.By introducing the model and generation principle of photovoltaic,wind energy,fuel cell and micro-gas turbine system,the corresponding treatment of the type of distributed power grid node is conducive to the analysis and research of the operation mode of power system.After the distributed power supply is integrated into the distribution network,the traditional power flow algorithm needs to be optimized to meet the changes of the power network structure.This paper analyzes and compares the principles of several common traditional power flow algorithms,such as Gaussian Saidel method,Newton Bluff method,P-Q decomposition method and forward sweep method,and selects the ideal power flow calculation method according to the characteristics of distribution network,that is,uses the fast decomposition method to calculate the power flow of the 6 KV distribution network with distributed generation.The fast decomposition method is a power flow calculation method based on the P-Q decomposition method.In the 6 KV distribution network with distributed power supply,there are small load branch system in the power network.The fast decomposition method could not satisfy the using conditions,and the convergence of power flow calculation is worse and even divergence.Therefore,the fast decomposition method is needed to be improved,that is using the fast decomposition method.By using the IEEE30 node for example analysis,and using MATLAB language to improve the iterative program of fast decomposition method,then adopting the program test results to reflect the strong practicability of the improved fast decomposition.