Control of single phase UPS inverter using Fuzzy Gain Scheduling of PI Controller

This paper presents Control of single phase UPS inverter Using Fuzzy Gain Scheduling of PI Controller. This control scheme has Double Loop Current Mode Control Scheme in core. It includes two control loops as inner and outer. The feedback signal of the inner loop is the inductor current of the inverter filter while the feedback signal of the outer loop is the output voltage. Fuzzy Logic Controller (FLC) adjusts the voltage loop PI controller parameters according to the behavior of the output voltage. The input variables of the FLC are voltage error and its derivative. In this study, both Double Loop Current Mode Control Scheme and Current Mode Fuzzy Gain Scheduling of PI Controller are simulated digitally using PSIM and C++ under linear, rectifier-type nonlinear and fluorescent loads. And the results are discussed.