Research On The Influence Of Voltage Caused By Distributed Generation And Optimal Allocation Of Distributed Generation

In the past forty years of reform and opening up,China's economic and social development has been rapid;meanwhile,fossil fuels are gradually drying up,and the ecological environment is deteriorating.Distributed generation(DG)has attracted much attention because of its high efficiency in utilizing clean energy,convenience for flexible dispatch of power grid and delay of power system upgrading.The combination of regional interconnection of large power grids and distributed generation can effectively solve the problem of inconsistent generation resources and load locations,and improve the security and reliability of distribution systems.However,the power quality,voltage stability and other indicators will be affected when the distributed generation is connected to the power grid.Therefore,how to make the advantages of distributed generation and traditional large power grid complement each other has become an urgent problem to be solved.The main content of this paper is to study the impact of distributed generation on distribution network and its optimal allocation.The influence of distributed generation on distribution network is the premise of studying the value of a distributed generation to distribution network.Firstly,several kinds of distributed generation are introduced in this paper.Distributed generators are studied,and then the effects of distributed generators on voltage distribution and static voltage stability in distribution networks are discussed.The capacity limit of distributed generators in distribution networks is simulated and analyzed by genetic algorithm.Then,the existence of power flow equation solution is proposed for the low voltage level in distribution networks.The static voltage stability index is used to evaluate the static voltage stability of distribution network.Because the indexes of power quality in distribution network influence each other and contradict each other,how to unify the various indicators of distribution network is also a problem to be considered when optimizing the configuration.Because the weight method can not effectively evaluate the distribution network as a whole,the membership function of fuzzy mathematics is used to evaluate distribution network.The index of the system,which can evaluate the index of distribution network comprehensively and comprehensively,is conducive to the unified consideration of configuration optimization.Finally,an example of IEEE33 is simulated,and the correctness of the objective function is verified by comparing with single objective optimization,which can obtain better overall satisfaction.