Research On Planning Of Microgrid With Hybrid AC/DC Distribution Equipment

Micro grid is an effective way to solve many problems in the future of power grid development,it is composed of distributed generation,load,energy storage system,reactive power compensation device,power conversion device and monitoring protection system consisting of a homemade system with self control and self management.It can improve the capacity of distributed generation,improve the utilization efficiency of intermittent renewable energy,improve the reliability of power supply,and reduce network loss.The technical basis of Hybrid AC/DC distribution equipment is multi-terminal flexible DC transmission with back-to-back,through the design of control strategy implementation in converter control,which can realize multiple sources and loads in micro-grid load "plug and play".Multiport design of the hybrid AC/DC distribution equipment,can construct a new type of AC/DC hybrid micro-grid network,make the system run smoothly,implements the flexible energy conversion,reduce the cost of investment,improve system reliability and improve the utilization of clean energy,pre-planning has important significance of micro grid.This paper conducts research in the following four aspects:load forecasting,including AC/DC hybrid distribution equipment of micro-grid power planning,including AC/DC hybrid distribution equipment of micro-grid network frame structure design,including AC/DC hybrid distribution equipment of micro-grid comprehensive evaluation.Firstly,the load characteristics of multiple loads are investigated according to the application scenarios of the hybrid micro-grid,and the characteristics of various loads are analyzed and the daily load curves are constructed.Aiming at the load of electric vehicles,the monte carlo simulation method is used to predict the accurate load and improve the accuracy of the daily load curve.Then,the paper analyzes the daily load changes,the distributed generation capacity,AC/DC hybrid distribution equipment access,factors such as the weather changes,the reliability parameter requirements for AC/DC hybrid micro-grid planning.On this basis,the economy as the goal,the reliability of the hybrid micro-grid system is the constraint condition,AC/DC hybrid micro-grid planning model is established,and the scenery store three combination scheme of distributed generation,using particle swarm algorithm,formed with AC/DC hybrid distribution equipment of micro-grid power optimal capacity allocation plan.Secondly,the design principle of the micro-grid network frame structure with AC/DC hybrid distribution equipment is proposed for the technical advantages of AC/DC hybrid power distribution equipment.Considering load curve,the weather changes,configuration,distributed power capacity factors,such as monte carlo simulation reliability calculation model is established,space truss structure of typical AC/DC hybrid micro-grid for comparison.Based on the design principle,the grid structure of the micro-grid with AC/DC hybrid distribution equipment is designed,and the network frame structure is analyzed and summarized.Finally,in view of the features of AC/DC hybrid distribution equipment of micro-grid planning,to establish a set of evaluation index system of micro-grid planning,the index system by the economical efficiency,reliability,and environmental protection of three parts.Based on analytic hierarchy process(ahp)with AC/DC hybrid micro-grid network frame of evaluation model of power distribution equipment,comprehensive evaluation of a variety of micro-grid structure,this paper expounds in detail and the evaluation process,the evaluation results show that the feasibility and effectiveness of the evaluation index system and method.