Design of optimal lighting control strategy based on multi-variable fractional-order extremum seeking method

In recent years, the light-energy consumption accounts for quite a large proportion of total electricity consumption. In this paper, an optimal lighting control strategy is designed for a lighting system with multiple lighting sources, to decrease electric energy consumption and increase energy efficiency. In the proposed control strategy, a novel multi-variable fractional-order extremum seeking control (FO ESC) strategy is implemented in minimizing the light-energy consumption by separately regulating the brightness of multi-lighting sources, while a PID method is applied to guarantee the desired lighting level. The proposed scheme is presented to not only raise the convergence rate and enhance the control accuracy, but also to improve the search efficiency of the minimum light-energy consumption by manipulating the fractional-order. Experimental results including comparison with the corresponding integer-order (IO) ESC show that the light-energy consumption under the proposed strategy can approach a smaller neighborhood of the minimum lighting energy point more quickly. (C) 2018 Elsevier Inc. All rights reserved.