The Intelligent Power Distribution System Based On AC/DC Hybrid Power Supply Application Research

With the distributed power supply and power electronic load ratio increase,the new has adverse effect on the safe and reliable operation of power grids.At the same time the network frame is not strong enough in our country and the information construction is not perfect.On how to build a friendly,efficient and good compatibility of new power supply mode,this thesis presents a topology characteristics of AC/DC interconnected,relying on the power grid control,which access scheme of the system is compatible with the existing 380 V AC,and puts forward the related system components and its application model and two key technology of AC/DC hybrid system are analyzed in detail.This article introduces the existing and improved structure of the AC/DC power supply system firstly,and then gives the operation characteristics and physical model of photovoltaic cells,new load equipments,storage equipments and inverter,the last three level are analyzed in detail the operation of the relevant control methods,which mainly for the real-time control of power and the power,the correct control of power limited and the optimal control of three phase unbalanced.Aimed at the phenomenon of reactive power cannot be reasonable allocation,this thesis puts forward an inverter circulation suppression method which is suitable for distributed parallel operation and considers reactive voltage effect,and then puts forward the better performance of trimming technology.On the limit of power of AC/DC hybrid power supply system,this thesis puts forward the improved droop control method by studying the master-slave system on dealing with the problem,and analyzes the optimization control method of energy storage devices.In view of optimization problem on the phenomenon of unbalanced three-phase AC/DC hybrid system,this article,using the strategies of the active power grid inverter support and reactive power emergency support,introduced the power quality control technology which based on the "ABCD" four phase under the way of power distribution network structure in detail.This thesis built the inverter parallel operation system model,AC/DC hybrid power system simulation model and capitation,a simulation model of the three-phase equilibrium through Matlab/simulink software simulation platform.A large number of simulation experiment verifies the correctness of the theoretical analysis.