Design and implementation of an optimal switching controller for uninterruptible power supply inverters using adaptive dynamic programming
Ataollah Gogani Khiabani, Ali Heydari · IET Power Electronics · 2019
In this study, a new approach based on adaptive dynamic programming (ADP) is proposed to control single‐phase uninterruptible power supply inverters. The control scheme uses a single function approximator, called critic, to evaluate the optimal cost and determine the optimal switching. After offline training of the critic, which is a function of system states and elapsed time, the resulting optimal weights are used in online control, to get a smooth output AC voltage in a feedback form. Simulations show the desirable performance of this controller with linear and non‐linear loads and its relative robustness to parameter uncertainty and disturbances. Furthermore, the proposed controller is upgraded so that the inverter is suitable for single‐phase variable frequency drives. Finally, as one of the few studies in the field of ADP, the proposed controllers are implemented on a physical prototype to show the performance in practise.