The stability of an urban rail transit traction power supply system is related to the safety of urban power grid and the stable operation of traffic. Due to the large amounts of cables and a series of power electronic devices which have been put into use,problems such as harmonics and reactive power will arise and seriously damage the safety of the traction power supply system. As the core equipment of the traction power supply system,the traction transformer has important functions such as transmitting power supply and filtering nonlinear load harmonics. DC bias is a widespread phenomenon adversely affecting the traction transformer,and it may directly threaten the safe and stable operation of the traction transformer. Based on PSCAD/EMTDC and ANSYS,the UMEC model and finite element model of a novel traction transformer are established,respectively. By means of multi-platform hybrid simulation,the electromagnetic,loss and other excitation characteristics of this traction transformer under DC bias are observed and analyzed. With a comparison with the traditional traction transformer,the excitation situation of the novel traction transformer under DC bias is evaluated.
维普
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