Research On The Utilization Of Train Renewable Energy Under The Combined Substation For Power & Traction

As the railway construction is booming in China,urban land shortage will be an important factor restricting the development of suburban railways.At the same time,as a large industrial user,in order to respond to the national energy policy of energy conservation,emission reduction,green industry and sustainable development,attention has been paid to how the regenerative braking energy of the train can be used again in electrified railways.Therefore,for the railway sector,on the limited land resources,improving the utilization rate of regenerative braking energy of trains is a necessary condition for the steady development of the railway industry.The construction of co-built for both power substation and traction substation is focused on in the paper,which provides a theoretical basis for the use of regenerative energy for trains in joint construction stations.Firstly,the composition and working principle of the regenerative braking system of highspeed trains are analyzed,discussing the regenerative braking energy utilization methods common in the field of electrified railways and urban rail transit,and compare the advantages and disadvantages of various systems and the scope of application in depth;The two shared power supply schemes after the co-built construction of the traction substation and the power substation are proposed to discuss the application prospects,advantages and existing power quality problems of the co-built substation system.Secondly,the power quality problems caused by the regenerative braking of the train to the co-built substation are studied,the relationship between the three-phase imbalance degree caused by the traction load and the connection form of the traction transformer are analyzed,as well as the relationship between the operation condition of the traction load and the three-phase imbalance degree of the incoming line side and the high-voltage side of the traction transformer.Taking the single-phase co-phase traction power supply system as the governance scheme,the simulation model is built on the MATLAB / Simulink platform to verify the applicability of the scheme to the governance of power quality problems.Finally,from the theoretical point of view,the feasibility of the utilization of regenerative braking energy in the co-built substation system is analyzed.The power flow model of the cobuilt substation system of a city’s suburban line S1 is established,and the power flow distribution in the co-built substation is obtained by the measured traction load data.At the same time,the simulation model of the system is built on the PSS / E platform to verify the calculation the correctness of the results.After a preliminary conclusion is reached,the corresponding economic cost is calculated based on the measured data,which verifies the feasibility of the simulation.