An integral sliding-mode controller for energy efficiency improvement in AC power source supplied AC machine drives

This paper develops an integration slidingmode controller (ISMC) for a full-bridge single-ended-primary-inductance converter (SEPIC) supplied to an inverter-fed AC motor drive. Configuration of the developed SEPIC-based system is that a full diode bridge connected AC-to-DC SEPIC converter with power factor correction (PFC) is built for stably supplying DC voltage to the inverter. Under this configuration, the ISMC is applied for voltage control of the SEPIC converter with PFC of the AC-side line. With the PFC, the energy efficiency measured from the AC power source to the inverter-fed AC drive can substantially be improved. To perform the proposed ISMC, a Simulink model consisting of the AC source, diode-bridge rectifier, SEPIC, voltage-type inverter, and induction motor drive was built in a computer. Simulation results from the built Simulink model are illustrated to demonstrate the validity of the proposed ISMC for applications.