Control of induction motor with DC-link voltage ripple for high speed train applications

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 space. A novel control strategy is proposed in this paper to control the induction motor without L-C circuit. The MATLAB simulation and hardware-in-loop experiment show the method is effective.