Research On The Power Supply Mode Of AC And DC Distribution Network With New Energy Consumption As The Constraint

With the constant adjustment of energy structure and the continuous development of smart grid,new energy power and energy storage connect to the distribution network on a large scale,and the proportion of new DC loads on the user side is increasing.The distribution network connects with the user side closely,and the demand for the distribution system is continuously increasing.The AC network presents problems such as poor adaptability of network architecture,voltage fluctuation and single power supply load.Significant improvement of the social and economic level,the energy revolution,power electronics technology,and new materials continue to make breakthroughs.The future grid puts forward high quality requirements for the power supply capacity,equipment reliability and new energy acceptance with high permeability of the distribution system.Therefore,the advantages of AC and DC distribution network become obvious.This paper focuses on the AC/DC distribution network power supply mode constrained by the consumption of new energy.Main tasks as follows:In order to meet the needs of large-scale new energy and DC load grid connection,and to achieve economic growth,this paper proposes a step-by-step evaluation method for the AC and DC hybrid power supply mode with the consumption of new energy as the constraint.First,the existing domestic and foreign demonstration projects of AC/DC hybrid distribution network are investigated,and three classic power supply modes are extracted.The structure,operation mode,reliability,new energy capacity and other performance are analyzed.Then,a comprehensive evaluation index theory,which covers four dimensions of absorption capacity,economy,reliability and power quality,and can reflect the difference of power supply modes is constructed.Based on the clustering scenario,AC-DC optimized power flow,sequential Monte Carlo and other methods are used to solve the index,range variation formula and combination weighting method are used to normalize the index and implement the solution of index weight.On this basis,a step-by-step evaluation method for the AC and DC hybrid power supply mode is adopted.First,the power supply mode is optimized with the goal of maximizing economic output and input ratio,and the new energy consumption is taken as the constraint,which can archive the best economic efficiency.Second,on the basis of the first step,the optimal power supply mode is evaluated based on the linear weighted optimization of multiple indicators.Finally,a high-tech park is taken as an example,and the optimal power supply mode under different consumption demands is selected by calculating the calculation results of the indicators under different power supply modes.By verifying the evaluation method,it is concluded that the step-by-step decision-making scheme is feasible,which provides a practical method for the research and landing of AC and DC distribution network.