Research On Three-phase Power Flow And Multi-objective Optimization Algorithm For Distribution Network With Distributed Power

With the rapid development of distributed power generation technology,modern power systems have the characteristics of large scale,complex structure,and unbalanced three phases.This poses greater challenges to power systems and raises the power flow calculation and optimization of power systems.The penetration rate of distributed energy in the power supply network is getting higher and higher,but its large amount of access will have some adverse effects on the power grid,and there are certain operational risks.In order to analyze the impact of distributed power access on the power network and balance the unfavorable factors of the connection,it's of great significance to the calculation and analysis of three-phase time series power flow in distribution networks.This paper firstly introduces the processing methods of four different types of distributed power supply nodes and the short comings of the three-phase power flow calculation method for the distribution network,and on the basis of analyzing the characteristics of the relevant components,and establishes the three-phase mathematical model of distribution lines,distribution transformers and loads,a three-phase power flow calculation model is established by using forward-backward algorithm and Newton-Laphson method.The loop impedance matrix method is used to calculate the three-phase voltage difference,which solves the applicability problem of the single-phase power flow calculation.The convergence of the node voltage is used to control the power flow calculation.The voltage value can be directly obtained,and the iterative calculation is simple and efficient.Finally,it is verified that this method has good convergence by taking the IEEE 33-node network model and a 10 k V distribution line from Shantan substation as examples.With access to more optimal power flow of distribution network,this paper analyzes the timing characteristics of different kinds of distributed power and loads,and constructs different distributed power flow calculation model.The multi-objective optimization of distribution network is constructed.At last,the improved krill swarm algorithm is used for calculation.Taking IEEE 33 node and IEEE 118 node as two examples,the timing and power flow calculation of distribution network are analyzed,and the feasibility of this method is verified.