Design And Optimization Of The Traction Power Supply System Of Shitai Line

At present,China's electrified railway is developing rapidly.Even so,the existing railway system is difficult to meet China's growing railway transportation requirements.According to the "China Railway Medium-and Long-Term Development Plan",the "four vertical and four horizontal" railway rapid passenger transport corridor and the planning of four intercity rapid passenger transport systems are of great significance to the development of China's railway system.Shitai Line is an important passenger line connecting Shijiazhuang and Taiyuan,and is also an important part of China's railway planning “four horizontals”.This paper firstly conducted an electrical preliminary design of the traction power supply system in the new construction of the Shitai Passenger Dedicated Line.After investigating the basic conditions of the new railway Shi Taike special and the status quo of the existing hubs and adjacent lines,the data needed for the new construction and reconstruction process were analyzed and the basic calculations were made to determine the external power supply scheme and traction of the system.The type of substation,the type and capacity of the traction transformer,the power supply of the catenary,and the external power supply scheme of the system.Secondly,according to the relevant requirements,the main wiring design of the traction substation,the sub-station and the opening and closing station and the main electrical equipment selection,the main electrical wiring diagram of the main substation is drawn.The power supply simulation of the transformer's installation capacity and line voltage confirms that the design meets the requirements.The prediction and analysis of harmonics,power factor,three-phase voltage unbalance and voltage fluctuation are given,and the prediction results and suggestions are given.After analyzing the necessity of comprehensive grounding of the traction power supply system,the integrated grounding implementation scheme is proposed according to the principle of the integrated grounding scheme.The optimized design part solves the problem that the traction substation in the operation of Shitai Line has been out of operation due to flood disasters.The traction power supply system is optimized and the relevant power supply capacity parameters are met to meet the operational requirements.Finally,the field test and analysis data are analyzed.The feasibility of adopting a fully parallel AT power supply scheme and an optimized solution for cross-over power supply.At the same time,the parameters of the system's power supply,power supply and other parameters are analyzed.Through theoretical analysis,it is concluded that the minimum voltage of the normal power supply is greater than the minimum voltage of the cross-region power supply,which is slightly lower than the normal power supply voltage.However,the power supply voltage can be adjusted by adjusting the route traffic or adjusting the train running time,and the lowest measured network voltage of the cross-region power supply is obtained from the measured data.It is greater than its minimum limit.In addition,it can be seen from the measured data that the current exceeds its limit current at a certain time,but the total time exceeding the limit current is small,and does not affect the line current carrying requirement during the cross-region power supply load operation.In summary,the preliminary design and optimization plan of Shitai Line has improved the comprehensiveness and integrity of the railway power supply system and accumulated valuable experience for railway construction in the future.