Research On Voltage Of Distribution Network With High Permeability Distributed Generation

Because the distributed power generation has advantages of small investment,flexible power generation,low loss,conducive to environmental protection and the peak power load than the centralized power supply more economical and effective.So distributed power and large power supplemented coordinated with each other is the ideal way to provide users with reliable and high quality power by using the existing resources and equipments.Distributed generation connected to the grid is an inevitable trend in the future development of distributed generation technologies.But when the distributed power generations access to the network scattered,the traditional single power supply radial distribution network structure transformed into the many power network structure,and the distribution network voltage distribution changed,which leads to the voltage stability problems.In this paper,the high permeability distributed generation of distribution network voltage stability are analyzed and studied.First of all,the concept of distributed power generation characteristics,the basic structure,operating standards and research status at home and abroad were described in detail in this paper.The concept of energy flow and permeability in distributed power generation is discussed.The influence of distributed power generation on the stability of power system is analyzed and simulated.And the effect of different permeability on the steady-state voltage was studied with the stable operation of EPRI 36-node system.Secondly,a steady state mathematical model of distributed power supply is established and the four types of PQ,PV,PI and P-Q(V)are processed according to the basic principle of the newton method distribution network power flow calculation method.The three-phase power flow equation of high-permeability distributed power grid is deduced.The reliability and superiority of the method are verified by using the 33-node distribution system to access the distributed power generation.Finally,a multi-objective optimization model with the best voltage level,the least loss of net loss and the least economic cost of operation is established,and the concept of simulated annealing and particle swarm optimization is introduced.A simulated annealing particle swarm optimization algorithm is proposed to optimize multi-objective optimization problems.The results show that this method is an effective method to solve the multi-objective optimization problem,and the optimal distributed power supply scheme can be obtained.