Research On Optimal Configuration Of Distributed Power Supply Connected Distribution Network

Distributed power generation technology can fully develop and utilize all kinds of renewable energy, play a powerful complement and an effective support role of the future power grid,, has become one of the important development trend of future power system, but also a hot issues of the present study. When distributed generation and distribution system in parallel operation, able to provide effective support for the system, improve the operation level of the system, including reducing network losses, raising node voltage, improve power quality and improve power supply reliability, but When the installation location and the installed capacity of distributed power generation is unreasonable, it will produce a series of adverse effects on the system, such as trends reverse, affect the correct operation of protection device, the node voltage exceeds the permissible value, etc. so it is very necessary to optimize the configuration of distributed power access to distribution network.Optimal allocation of this paper of distributed generation access to distribution network is in the context of the existing distribution power system wiring and operation mode has been determined, to study optimal access locations and network capacity of distributed generation and enable it to maximize the performance indicators of distribution system. This paper first analyzes the impact of distributed generation access locations and network capacity on the distribution system voltage quality, network losses, system protection and operational reliability,since the optimal allocation of distributed generation need to use flow algorithm to obtain distribution network operating state, Use an kind of improved forward and backward substitution algorithm to adapt to a variety of distributed generation access and verify its effectiveness.From the view of an economic point and reliability, propose to reduce loss best, node voltage offset the minimum and optimal static voltage stability as objective functions, combined with the voltage, current, DG and total network capacity and a single DG and network capacity constraints, establish the mathematical model of distributed power optimized configuration, using Elitist non-dominated sorting Genetic Algorithm configured as a distributed power optimization algorithm, the mathematical model and optimization algorithms for the optimization configuration have been tested on the distribution system of 33 node,the indicators were compared before and after optimization,and compared with the results of other optimization algorithms,verified the optimization model and the optimization algorithm used in this paper is effective and advanced.from all aspects.