IGBT Losses Analysis of a Three-Phase Rectifier Converter on Hybrid Train

A pulse width modulation (PWM) rectifier supplies direct current (dc) energy from an alternating current (ac) generator source to other loads, including battery modules, in a hybrid circuit. This rectifier has an essential function in the overall hybrid system. Therefore, it is necessary to evaluate all aspects of the rectifier, including power losses. This paper considers the power losses of IGBT as the main component of the rectifier. The relationship between IGBT losses and three loading scenarios is given. The first load is the motor operating at a 30% performance level with a 60 kW load, and the second load is when the battery is charged at 60% performance with a 90 kW load. The third load is when both the motor and the battery operate simultaneously at 100% maximum performance level with a total load of 180 kW. The operation of hybrid trains will be investigated. Based on the simulation result, losses at the maximum designed capacity, 180 kW, each IGBT conduction loss is around 580 watts, which is relatively small compared to the amount of power produced. These power losses are close to the losses in the diode. Based on the simulation result of each IGBT switching loss, the value is 0.044 watts, which is relatively small compared to the amount of power generated. This power loss is close to the loss in diodes. Based on the IGBT loss analysis above, the converter efficiency is 98.6 % (30 %), 98.7% (60 %), and 98.9% (100%). With the selected model, the IGBT shows a temperature-controlled increase of 40 degrees Celsius, with the voltage maintained at 600 V. The load scenario is directly related to the resulting current and temperature, so the losses can be analyzed. It is concluded that the higher the loading power, the higher the IGBT temperature, along with the increase in load.