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Recently, the medium frequency power electronic traction transformer (PETT) has received increased attention in the rail transit applications due to its small size, light weight, more space availability for passengers, multiple interfaces and other additional functionalities. However, the switching frequency is limited by the thermal tolerance of semiconductors which deteriorate as the switching frequency...
When the inverter is fed with a single-phase PWM voltage-source rectifier, there will be a voltage ripple in the DC-Link. It will cause the torque ripple of the motor and make the performance of controlling system worsen. So the rectifier needs an L-C resonant circuit for filter. But the high temperature will lower capacitor's lifetime and reliability, further disadvantages arise from costs and installation...
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