Analytic Harmonic Model of 12 Pulse Rectifier in Urban Rail Transit Traction Power Supply System

With the rapid development of URT (Urban Rail Transit), the power quality problems caused by URT are more and more critical. The harmonics of URT mainly come from pulse rectifier. The harmonic model of pulse rectifier mainly includes the harmonic source model based on characteristic harmonic analysis, simulation model and measured data driven model. The information of DC link should be known in the first model, which is not conducive to the calculation of AC power flow. Although there are already good simulation models avaliable, they are not suitable for the power flow calculation of large-scale power system. The measured data model is relatively simple, but it needs to be retested and modeled for different equipment, and the data are greatly affected by the fluctuation of the power system. Therefore, based on the DAP (detailed analytical procedure), a novel analytic harmonic model of 12-pulse rectifier in the URT is developed in this paper. Finally, MATLAB/Simulink is used to verify the accuracy of the model. The results show that the proposed model has almost the same accuracy as the simulation and is more suitable for power flow calculation of a large-scale power system.