Study On Electrified Railway New Trend Of The Control System Capacity Configuration And Control Method

With the rapid development of electrified railway,the railway load is becoming more and more onerous.Because the railway load has big power,quick change,nonlinear and asymmetric power supply,etc.A large number of negative sequence,harmonics and reactive power transfuse high voltage power grid through the traction transformer.It brings serious power quality problems for power system,and for other surrounding power user's normal electricity.To improve the quality of the traction power supply system,it is necessary to research a kind of the integrated management method which can efficiently solve the above problem.This paper is supported by the natural science fund project(51477046)"high-speed overloading electrified railway new trend of the control system and its optimal capacity allocation research".In this paper,the main work and innovations are as follows:First of all,this paper summarizes the domestic and foreign research on the management of railway load characteristic and power quality present situation,analyzed the principle and its advantages and disadvantages of the existing governance method.Analyzed essence and the advantage of electrified railway power quality management which based on Y/>? balance transformer from mathematics and physics principle.Put forward a new type of electric power quality comprehensive compensation system of iron.Based on Y/>? balance transformer this paper proposes a new type of electrified railway power quality comprehensive compensation system.Fully tap the Y/>? balance transformer ? potential function,put forward the system topology,it use Y/>? balance transformer secondary side of triangle winding tap,one end of the traditional railway back-to-back tide controller directly connected with the tap,thereby saving the side of the step-down transformer,which can reduce the manufacturing cost in the system,this is the most important innovation in this paper.Secondly,combining with the above research work,the RPC's ports in the system of coupling inductance is replaced by LC series inductance capacitance coupling branch.Use the method of mathematical analysis in the traditional way of coupling compared with the capacity of the coupling mode found that LC-RPC can be set lower compensation capacity than RPC,and through proper setting of LC parameters can be optimized compensation capacity,this paper presents a design method of its parameters.Finally,combined with the actual situation of the traction substation,based on Matlab/Simulink platform,established the system simulation model,and for a variety of working conditions for the simulation test of the system,and the simulation results confirm the system under various conditions of the power quality of electrified railway has good comprehensive effect.In order to further verify the correctness of this system,based on the laboratory existing Y/>? balance transformer and other test equipment to build the small power experiment model of this system.The experimental results to verify the validity of the system theory and the feasibility of the practice.