A Novel SVPWM Control Algorithm for Switching Power Amplifier of Active Magnetic Bearings

Space vector pulse width modulation (SVPWM) control algorithm is commonly used for power electronic converters. This control method can be applied to two-phase threeleg switching power amplifier for two degree-of-freedom (DOF) control coils, reducing the number of switching tubes and increasing the power density of the control systems. The reference voltage of SVPWM is usually calculated by PID controller. However, the PID parameters are difficult to adjust, and there will be chaos phenomenon. A new control method was proposed in this paper. Digital one-cycle control algorithm was used to calculate the reference voltage for SVPWM, which has the advantages of simple structure, high control accuracy, rapid response and no overshoot. Besides, In order to improve the control accuracy, a one-cycle algorithm model was established considering the resistance of magnetic bearing coil. Simulation proves that with this control strategy, the current closed-loop control has an ideal performance.