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According to the structure characteristics of distribution network, this paper proposes a hybrid algorithm based on particle swarm optimization to process the calculation problem of three-phase power flow in less loop distribution network. Through the MATLAB simulation data, it can be seen clearly that the algorithm not only controls the iterations number of the linear equation in the calculation, but also reduces the power consumption in the distribution system, which can greatly shorten the calculation time to improve work efficiency, and also puts forward a new method for the power flow calculation in distribution network. Introduction One of the most important link is the distribution network in the electric power system, it is the power from the power plant to the user, to provide users with direct power supply [1]. Although the voltage level of distribution network in the power system is lower than the voltage level of transmission grid, but with the rapid development of the whole city distribution network, the distribution network in the city accounted for the proportion is also growing. With the rapid development of distribution network automation, the network analysis and optimization problem are becoming more and more attention [2,3]. Power flow calculation has become the basic operation in the power system, and the essence of power flow calculation in power generation and load conditions is each node voltage distribution network. Usually, the solution uses the Newton method or other derivative algorithm. Although the use of these algorithms have been successfully to the ring structure in the transmission network, due to the large amount of calculation by using Newton method, each iteration must be corrected to linear equations in the matrix operation, so we have to reduce the amount of matrix iteration calculation, we add some necessary hypothesis: the first is the problem of impedance, we assume that the input impedance is greater than the resistance in computing distribution network, which is aimed at correction equation can decouple the active power and reactive power; Second is the phase difference of voltage, in the process of calculating we generally believe that the voltage phase angle difference between two nodes is relatively small [4-6]. Only in this way, it can turn the Jacobian matrix into constant matrix in the back of the calculation, the calculation process of the final is not invariant. At present, some scholars have put forward some algorithms according to the structure characteristics of distribution network, but these algorithms had not some cognitive standard, some peolpe selected the appropriate method according to the state component, some peolpe carried out calculation the divisions according to the processing mode among the three phase, and some peolpe carried out calculation and analysis combining with the two algorithms [7]. But these methods can not control their convergence times for the iterative linear equations, the number of too much iterations will be unable to improve the computational efficiency. Therefore, it is particularly important to put forward a kind of effective calculation method. 2nd International Conference on Electrical, Computer Engineering and Electronics (ICECEE 2015) © 2015. The authors Published by Atlantis Press 224 The Three-phase Line Distribution Network Model In the calculation of power system three-phase power flow, we can choose to suit the parameters according to the construction of line model. when the three-phase line symmetry, the mutual coupling three-phase system is coupled into the mutual decoupling symmetrical system; when the three-phase equilibrium, we can directly calculate the positive sequence component. The feeder model is shown in Figure 1. Fig. 1 The three-phase line feeder model The series impedance matrix and parallel impedance matrix are a complex matrix, in which the impedance diagram is shown in Figure 2. (a) Three-phase series impedance (b) Three-phase feedback shunt capacitor Fig. 2 Impedance model The series impedance matrix j Z is:

Application Analysis on the Power Distribution Network Three-phase Power Flow Based on Hybrid Particle Swarm Algorithm