Research On Reactive Power Optimization Technology Of Active Distribution Network Based On SOP

For the problems caused by distributed power supply connected to the grid and load fluctuation,including voltage collapse,voltage fluctuation,network loss increase and so on,make the hot research topic in theoretical circles focus on reactive power optimization of active distribution network in recent years.Reactive power optimization of active distribution network not only can control traditional reactive power optimization regulating device,but can coordinate the use of active reactive power regulation of DG to optimize the system,in order to lower the influence of system active power loss and system fluctuation on voltage quality.With the increasing of system fluctuation,it is a challenge for the reactive power optimization of active distribution network.Hence,we can make full use of power electronic technology to improve the ability of reactive power optimization of active distribution network to regulate and control.This paper will be based on original active distribution network accessing to intelligent soft switching device which can achieve flexible interconnection between multiple feeders and adjust the active power transmitted between multiple feeders effectively,in the meanwhile,it can provide some compensation for reactive power.Based on this,this paper makes a comprehensive consideration for the reactive power regulation means of active distribution network and the power flow control ability of SOP,a multi-method reactive power optimization research strategy of active distribution network based on SOP is proposed,aiming at improving the economy and security of the system.The main research contents are as follows:(1)The mathematical model of active distribution network with SOP is described,including system steady-state model and component model.Among them,the system steady-state model includes AC distribution network steady-state model and SOP internal DC system steady-state model;component models include distributed power supply model,reactive power compensation device model and SOP model.(2)With the analyzing of calculation method of power flow in active distribution network and calculation method of internal direct current system flow,and according to the steady-state equation of AC and DC system,the control strategy of converter and the transfer relationship of state variables between AC and DC system,we use alternate iterating algorithm to carry out flow calculation for active distribution network based on SOP.We take literature example to analyze and validate the model and algorithm.Starting from the structure of the system and components,the corresponding mathematical derivations are carried out respectively.(3)Based on the SOP of active power static mathematical model of dynamic reactive power optimization for discrete devices action number constraints in dynamic reactive power optimization problem,adopt a reactive power optimization decoupling strategy to deal with dynamic reactive power optimization model,and puts forward a kind of adaptive adjustment based on inertia weight and learning factor of the improved PSO algorithm,for solving static dynamic reactive study model.(4)After the improved of IEEE33 node test system,respectively,the static reactive power optimization Dynamic reactive power optimization simulation results verified the correctness and effectiveness of the proposed model and algorithm,and proves that the active power distribution network based on the SOP means more reactive power optimization methods in terms of the economy and safety of hoisting system,the effect is obvious.