Electromagnetic stirring power supply system with bidirectional energy flow and its control strategy

A control strategy for bidirectional flow of electromagnetic stirring is proposed. The topology structure of the system includes the forward stage PWM converter and the backward stage two-phase three-leg converter, which both can work in the rectifying and inverting status. So bidirectional energy flow can be realized. The control method for the forward stage is the double loop control with ripple correction. The control method for the backward stage is the current tracking control based on PR. The harmonic current caused by the two-order ripple of the DC-side voltage is suppressed. The reliability and dynamic tracking performance of the system is improved. The simulation results verify the correctness of the proposed control strategy.