Research On The Optimization Of Continuous Co-phase Power Supply Technology Scheme

At present,the power supply mode is widely used in the electrified railway of our country,which is to set up the neutral section in the traction substation and the section post.However,the locomotive will produce a series of problems in the section post,and the neutral section itself is short life and poor reliability,so it is necessary to study the technology of continuous co-phase power supply scheme of the entire line without neutral section.The realization of the technology of continuous co-phase power supply is based on three key technologies:the combined co-phase power supply technology,the new bilateral power supply technology,and the segmented power supply and state measurement and control technology of traction network.Traction substation standby mode and traction network power supply capacity is analyzed and optimized on the basis of the scheme of continuous co-phase power supply proposed by teacher Li Qunzhan to ensure a higher economy under the premise of the normal operation of the power supply system.First of all,the three key technologies of continuous co-phase power supply are introduced in this paper.Because of the flexibility and variability of traction substation standby mode in the scheme,it is possible to consider discarding the excess equipment to optimize the standby mode of traction substation.And the optimization scheme of 100%-0-100%standby mode of traction substation is proposed,and the reliability of each traction substation in this standby mode is analyzed by GO method to demonstrate the feasibility of the scheme.Secondly,the principle,classification and advantages of the AT power supply mode and long distance power supply mode is introduced in this paper,and combined power supply mode of 55kV "cable + AT + direct supply" is used to enhance the power supply capacity of the traction network,increase the distance between the power supply interval,reduce the number of traction substation,saving economic costs.Then the current distribution,impedance curve and voltage distribution of this power supply mode are analyzed theoretically,and the Simulink simulation model is built and verified.And on the basis of the first two chapters,the optimized scheme of continuous co-phase power supply is proposed.Finally,the optimized scheme of continuous co-phase power supply is adopted in this paper.Then taking the Huanghuanan-Dajiawa railway as an example to analyze the economy,the scheme of two traction substations and three traction substations are adopted respectively.Compared with the original scheme from the aspects of economic benefits,it is shown that the optimized scheme of continuous co-phase power supply has higher economy.