One-Cycle Controller For UPS's Buck Converter Operation

This paper proposes a One-cycle Controller (OCC) to regulate a buck converter operation used in an Uninterruptible Power Supply (UPS) system. The controller regulates the buck converter operation to supply a constant DC voltage for charging the UPS battery. This controller exhibits fast transient and dynamic responses to the input power disturbances. It rejects power disturbances by ensuring that the average output voltage value is always proportional to the average control signal. The proposed system is modelled in MATLAB/Simulink to verify the buck converter operation to supply constant DC voltage during short-term and long-term voltage sag and voltage swell problems. The simulation results have proven that OCC can reject voltage disturbances and successfully regulate the buck converter operation. Hence, this controller is suitable to be used in the UPS system.