A simple variable integral gain PI controller for a single-phase Inverter

In this paper, a simple variable integral gain PI controller for a single-phase Inverter is presented. The controller is based on a conventional PI by adding a rule of Fuzzy Logic Control (FLC), the complete mathematical model is derived. Compared with the conventional PI controller, the integral gain of the proposed controller can be adjusted online. The efficacy and feasibility of the proposed methods are shown by presently simulation results. Simulations are realized under linear and nonlinear loads, the results show that the proposed controller provides lower total harmonic distortion (THD). A 50Hz 1KVA experimental prototype is constructed to realize 220v 50Hz output with 220v DC input, and it shows stable property.