Lifetime Optimization Control of Traction Converters Based on Junction Temperature
Junction temperature is the main factor affecting the life of insulated-gate bipolar transistor(IGBT).In order to improve the life of metro two-level traction converter in subway systems,this paper proposed a dual vector model pre-dictive torque control(DVMPTC)strategy of asynchronous traction motor to reduce the junction temperature.Firstly,the selection range of the second voltage vector of traditional DVMPTC was reduced to the range of not switching with the first voltage vector or switching only once,so as to reduce the switching losses of IGBT and reduce the burden of calcula-tion.Secondly,by constraining the losses of IGBT and its anti-parallel diodes in the cost function,the loss factor was dy-namically added,and the weight factor was given,so that the selection of the optimal vector addressed both the control performance and the reduction of losses.The simulation results show that the proposed method,which reduces the junc-tion temperature and its fluctuations,improves the life of the traction converter compared with the traditional direct torque control strategy based on the segmented modulation.
two-level traction converterjunction temperature of insulated-gate bipolar transistor moduledual vector model predictive torque controlloss factorlife of traction converter
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