The Compensation Optimization Scheme Of Cophase Traction Power Supply Substation

Considering the problems existed in the electric traction power supply system of electrified railway, such as abundant reactive power, negative sequence and harmonics, and the lost of traction speed and power which are restricted by phase splitting influence the power quality and restrict the improvement of railway high speed and over loading. A low cost hybrid compensation co-phased traction power system consisted of YNvd balanced transformer, active compensation and passive symmetrical compensation is presented and compared in this paper which solves the problems of both power quality and phase splitting.In order to save the capacity investment and improve the economic efficiency of traction substation, complete compensation is always not needed in practice. The model of satisfactory optimization with hybrid compensation co-phased traction power system capacity is presented in this dissertation.In this paper, the structure of co-phase traction power supply system and the performance of the YNvd balance transformer are discussed, the structure of the Integrated Power Flow Controller (IPFC), the principle of balanced transformation and the passive symmetrical compensation are analyzed. And the paper put up the hybrid compensation co-phase traction power supply system simulation platform based on MATLAB. Prove that this style is feasible.The relationship between compensation degree and compensation capacity of the passive symmetrical compensator and the IPFC based on the YNvd balance transformer is presented. Through analyzing traction bus current, traction bus voltage before and after compensation, the relationship between three-phase current unbalance degree, traction current total harmonic distortion rate and compensation degree is presented. Satisfactory optimization calculation of compensator capacity is presented.In the end, he paper put up the hybrid compensation co-phase traction power supply system satisfactory optimization simulation platform based on MATLAB. Come to the conclusion that IPFC capacity can be reduced, via satisfactory optimization.