A Reconfiguration Study On The Distribution Network With Distributed Power Based On PSO-AFSA Hybird Optimization Algorithm

With the economic development of modern society and the adjustment of energy structure, the grid has to be more and more intelligent to improve its ability of power supply and efficient operation. As a result, it is imperative to develop smart grid. However, the Intelligent power grid is just a link in the process of developing a smart grid. The mere consolidation of the UHV and EHV is not enough to ensure a strong, smart state grid and it is also necessary to simultaneously optimize the low pressure user terminal and meet its power demand. The Distributed Generation—DG, as an under-35KV regenerative power, which is not directly connected to the centralized transmission system, plays an important role in cutting down the investment in the transforming and transmission of power, satisfying reliable power supply, adjusting and easing the power pressure in distant places and short-supply areas. But most of the traditional distribution network uses the single power mode and the DG intervention will affect the power supply mode of the distribution network and its topology structure. Without a proper solution to DG interconnection capacity, installation location, operation mode and DG interconnection of distribution network topology, its advantage of DG interconnection capacity will be lost and the former Distribution network power parameters will also be affected. Since the distribution network can change the topology by changing the switch, it is both theoretically and practically significant to use the distribution network reconfiguration to properly arrange DG interconnection to decrease network loss, improve the node voltage deviation, and ensure the economic security of distribution network operation of DG.This paper first sketches the currently-applied algorithm of distribution network reconfiguration and the current studies of distribution network reconfiguration under different algorithm, analyzes the different types of DG tidal current model and node model. Then, It also introduces the basic principle of PSO algorithm and AFSA algorithm and calculation process. Combining the advantages of the two algorithm, this paper proposes an optimized PSO-AFSA algorithm and applies this algorithm into the distribution network reconfiguration. At last, this paper focuses on the Iterative calculation of the with- or without DG distribution network in the case of IEEE-33 node system, with a target to optimize the minimum system active network loss. It also works out several plans to analyze the effect of initial parameters on reconfiguration and conducts a comparative study of other algorithms in converging speed and optimizing efficiency. The calculation shows the Interconnection of DG reduces the voltage deviation of each node and active network loss, improves power supply reliability of the system and also verifies the feasibility of PSO - AFSA hybrid optimization algorithm.