Design And Simulation Analysis Of Power Supply System Of High-speed Railway At Substation Based On Microgrid

With the rapid development of electrified railways in recent years,electrified railways has become an important power user in our country.High-speed railway AT stations are widely distributed along the railway,of which safe and stable load operation is to guarantee the highspeed railway operation.In order to solve the power supply problem,the distributed power sources supply form of microgrid for AT station has unique advantages and important significance.According to the existing power supply mode of high-speed railway AT station,this thesis proposes the idea of using wind-solar storage microgrid to supply power to the electric equipment of high-speed railway AT station.It mainly conducts the following research,including the basic structure of the high-speed rail AT station microgrid and the optimized configuration of the microgrid capacity,microgrid control strategy,etc.The specific content is as follows:(1)Under the background of distributed power and microgrid technology,this thesis analyzes the geographical characteristics of the high-speed rail AT station and the existing problems of the existing power supply mode,and it proposes the design conception of two typical power supply schemes of AC/DC hybrid microgrid with and without contact line for AT station.Basing on analyzing the advantages and disadvantages of the two schemes to adopt a power supply scheme that is more in line with actual needs.(2)In view of the designed high-speed rail AT microgrid structure to consider its investment cost and take the minimum net present value cost including environmental protection conversion costs as the objective function.Considering the relevant constraints and evaluation index to establish a capacity optimization model,which is based on mathematical model of the distributed power and energy storage system.Then to configure the optimal capacity for each power generation unit of the designed microgrid.(3)Taking a certain high-speed railway AT station actually investigated as the research objective,and using the HOMER Pro software to optimize configuration capacity by analyzing the investigation of the actual electricity load data.The results of comparing five different configurations show that: Compared with the power supply mode,the addition of a suitable capacity wind and solar storage microgrid to the high-speed rail AT station not only can solve the original power supply hidden dangers and improve power supply reliability,but also benefit greatly in terms of economic benefits and environmental protection,which is in line with sustainable development policy.(4)In order to further ensure that the configuration of generator unit capacity can meet the demand of the electricity load,the wind power and photovoltaic power adopt tracking control to the maximum power,the battery adopts the automatic disturbance rejection control,and the inverter adopts the virtual synchronous generator control.By researching of each control strategy principle,a simulation model is built in Matlab/Simulink software,and the optimized capacity configuration results are used as simulation parameters to verify the correctness of the designed microgrid and the applicability of the capacity configuration results.