Research On Distributed Generation And Energy Storage Optimization Configuration Of DC Distribution Network

With the increase of environmental pollution,Distributed Generation(DG)has ushered in the golden period of development,and energy storage stations(ESS)that can be used with distributed power sources to achieve energy efficient use are also favored.The AC distribution network is becoming more and more stretched in response to high-permeability distributed power access,energy storage access,and increasing DC load.In order to adapt to these new challenges,DC distribution networks have emerged.Similar to the AC system,the distributed power supply to the DC distribution network also affects the voltage and network losses of the power distribution system.In order to eliminate these effects and maximize the benefits,it is particularly important to optimize the distributed power supply and energy storage.This paper studies the optimal configuration of distributed power and energy storage in DC power distribution systems.The main work is as follows:Firstly,analyze the operating characteristics of DC distribution network with distributed power supply and energy storage.The output model considering the timing of the distributed power supply is adopted,and then the theoretical analysis of the possible effects of the distributed power supply after accessing the DC distribution network is carried out,and the distributed power supply has different penetration rates and different access modes.The voltage deviation and network loss are analyzed by a numerical example.Then,research on the operation strategy of energy storage in DC distribution network.An optimization strategy for smoothing load with minimum peak-to-valley difference,maximum load rate and minimum load variation under specific energy storage capacity is established.The energy storage operation constraints are considered to be energy storage and discharge power constraints,energy storage and discharge.The power conservation constraint,the energy storage charge-discharge rate constraint and the charge state constraint of energy storage are solved by particle swarm optimization algorithm.The charge and discharge power under different energy storage capacities are optimized,and the optimization effect of load curve under different capacity of three optimization strategies is analyzed..Finally,research on the coordinated optimal configuration of distributed power and energy storage in DC distribution network.The upper-layer model with distributed power supply and energy storage investment installation cost,operation and maintenance cost,main network purchase cost and system voltage deviation is established,and the source-storage collaborative optimization configuration double-layer model of the lower-layer model with the goal of reducing load variation is established.The planning layer constraint considers the distributed power permeability constraint and the energy storage installation capacity constraint.The operation layer constraint considers the tidal equation constraint,the node voltage constraint,the line power constraint and the energy storage operation constraint,and the algorithm is solved by the algorithm of particle group nested particle swarm and the simulation analysis of the source-storage collaborative configuration two-layer model...