Study On The Method Of Multi-point Planning Layout To Enhance The Capability Of PV Absorption With High Permeability

With the continuous increase of PV installed capacity,the contradiction between supply and demand of source load is prominent in northeast China,and the phenomenon of light abandonment occurs from time to time.On the other hand,photovoltaic(PV)power generation is characterized by randomness,fluctuation and uncontrollability.The maximum output power of large-scale PV power stations is far below the installed capacity,if the traditional planning method is used to plan the reactive power compensation device and the energy storage combined system according to the total installed capacity of PV,it will inevitably result in the over-allocation of reactive power compensation device and energy storage system,resulting in lower utilization of power grid assets.Therefore,the research on the multi-point planning and layout method of PV power stations in high-penetration areas is of practical value to tap the capacity of PV absorption and to connect PV to power grid in an orderly manner,it is of great technical significance to the construction of "three-type and two-network" ubiquitous power iot.In order to improve the absorption capacity of PV,this paper based on the statistical data of regional historical operation,the average and variance of PV output are calculated,and the Beta distribution parameters of PV output are obtained by curve fitting method,at last,the probability density curve of active and reactive power of PV is simulated,and then the internal operation mechanism and external working characteristics of the lithium iron phosphate battery are analyzed,and the external working characteristics of the lithium iron phosphate battery are analyzed by using Matlab Similink simulation software,to provide a basis for the promotion of PV absorption,the probabilistic load flow calculation method for distribution network with optical storage system is studied again,and the load flow calculation method is used for distribution network with optical storage system,the comparison of voltage and network loss index of the original power flow mode,PV access mode and optical storage access mode is studied,and the maximum PV access capacity is analyzedFinally,the distribution network layout method with optical storage system is studied,a multi-objective and multi-point programming layout optimization objective function is constructed,which takes into account the state of charge of energy storage equipment,the economy of optical storage and operation,the operating level of system voltage and the maximum capacity of PV,solving the model with an improved multi-objective Particle swarm optimization algorithm.The improved IEEE33 bus simulation test results show that the power flow calculation results are more intuitionistic and clear after considering the fluctuation characteristics of PV output,which accords with the actual operation requirements of the power grid,and the advantage of energy storage in the smooth Intermittent energy source is taken into account,finally,the multi-objective layout method can provide a variety of feasible solution sets for the planning operator,which is convenient for the decision-maker to obtain the corresponding optimal scheme from different target requirements,high practical value of engineering...