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access icon free Design and implementation of an optimal switching controller for uninterruptible power supply inverters using adaptive dynamic programming

© The Institution of Engineering and Technology
Received 04/02/2019, Accepted 13/06/2019, Revised 09/04/2019, Published 17/06/2019

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.

Inspec keywords: dynamic programming; feedback; variable speed drives; uninterruptible power supplies; function approximation; invertors

Other keywords: optimal switching controller; adaptive dynamic programming; single-phase variable frequency drives; inverter; smooth output AC voltage; single-phase uninterruptible power supply inverters; system states; called critic; ADP; elapsed time; single function approximator; nonlinear loads; resulting optimal weights; online control; control scheme; offline training; optimal cost

Subjects: Drives; Interpolation and function approximation (numerical analysis); Power convertors and power supplies to apparatus; Control of electric power systems; Optimisation techniques

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