Research On Optimal Configuration And Operation Of Distributed Generation Accessing Distribution Network

With the development of social economy and the improvement of living standards,the demand for energy power supply and consumption expanded dramatically.Developing new energy power generation was an effective means to cope with energy shortage.There was great significance to study the location and capacity of distributed generation(DG)in distribution network,so as to reduce system loss,improve voltage stability and economic operation of distribution network.In this paper,the following work was done under distribution network with DG:Firstly,the background and significance of the research was elaborated,the research status and the optimal configuration of DG were introduced.The research of network reconfiguration with DG was analyzed in this paper also.Secondly,the basic principles of various DG were introduced.Different types of DG were equivalent to negative load nodes,and the power flow calculat ion model with DG based on forward and backward was constructed.The different capacity and location of DG were simulated.Thirdly,an improved particle swarm optimization with differential evolution algorithm(PSO-DE)was given.In view of the shortcomings of the PSO which individuals were easily trapped in local optimum,the concept of evolutionary speed factor was used to reflect the degree of convergence;aiming at the invariance of inertia weight and learning factor in the basic PSO,it could not adapt to the iteration evolution.The strategy of dynamic adjustment of inertia weight and learning factor was adopted.According to the global convergence advantage of DE,the DE subgroup was added on the basis of the original population.When the particle swar m fell into the local optimum,the DE subgroup was used to help jump out of the local position.At the same time,the better individual was replaced by the particle swarm.The effectiveness and advancement of the proposed method were verified by simulation analysis of three typical optimization functions.Finally,the mathematical model of DG optimal was established,and the method of PSO-DE optimal process was given too.In the meantime,the DG optimal allocation for the IEEE system is analyzed.The mathem atical model of network reconfiguration analysis was established in distribution network with DG,and the optimization analysis of network reconfiguration was carried out.