Abstract: In order to improve the quality of steel casting and power quality of power supply, in this paper, an electromagnetic stirring（ES） two-phase orthogonal power supply（ESTOPS） which is composed of PWM rectifier and three-leg inverter was researched. According to the energy balance model of ESTOPS, the 2nd ripple of dc-link voltage was derived. Then an integrated control method was proposed for PWM rectifier, which can improve performance of PWM rectifier and suppress harmonics caused by the 2nd ripple. As for two-phase orthogonal three-leg inverter, a composite control method was proposed for current control by analyzing the mathematical model of ES, which can effectively combine fast tracking performance of feedforward control with closed-loop tracking performance of feedback control. So it can effectively improve the dynamic tracking performance of ESTOPS to meet the requirements of frequent positive- negative alternate rotation of ES. Finally, simulation and experiment results have verified the correctness of control method.