Abstract
We consider the classical power management problem: There is a system or “device” which has two states—ON and OFF—and one has to develop a control algorithm for changing between these states as to minimize cost (energy or some other hybrid cost) when given a sequence of service requests. We analyze this problem in terms of online competitive analysis to obtain worst-case guarantees. Although an optimal 2-competitive algorithm exists, that algorithm does not result in good performance in many practical situations, especially in case the device is not used frequently. To take the frequency of device usage into account, we construct an algorithm based on the concept of “slackness degree”. Then by relaxing the worst-case competitive ratio of our online algorithm to \(2 + \varepsilon\), where \(\varepsilon\) is an arbitrary small constant, we make the algorithm flexible to slackness. The algorithm thus automatically tunes itself to slackness degree and gives better performance than the optimal 2-competitive algorithm for real world inputs. In addition to worst-case competitive ratio analysis, a queueing model analysis is given and computer simulations are reported, confirming that the performance of the algorithm is high. We show how the approach can be generalized to a situation where the system has a number of intermediate states. Our model can be used to facilitate renewable energy integration into the electrical grid and we highlight that an online competitive approach can yield techniques for grid resiliency.
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Acknowledgements
This research has been carried out in collaboration with “Consumer Electronics Network Eco Management” project sponsored by Panasonic Corporation. We would like to thank the project members, Mr. Toshiya Naka, Mr. Hideyuki Yoshida and Mr. Kazuhiro Aizu. We also would like to thank Prof. Hiroshi Fujiwara of Toyohashi University of Technology for his valuable comments on power consumption problems and helpful discussions. Author Wolfgang Bein acknowledges a sabbatical granted by the University of Las Vegas, Nevada to conduct research in Japan. He also acknowledges NSF grant CCR-9821009. The authors are grateful to two anonymous referees for a number of helpful comments and insights that improved the paper.
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A preliminary version appeared in the Proceedings of the 9th Workshop on Approximation and Online Algorithms.
Wolfgang Bein: Research supported by NSF grant CCR-9821009. Shoji Kasahara: Part of JST ERATO MINATO Project.
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Andro-Vasko, J., Bein, W., Ito, H. et al. Decrease and reset for power-down. Energy Syst 14, 445–471 (2023). https://doi.org/10.1007/s12667-021-00475-3
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DOI: https://doi.org/10.1007/s12667-021-00475-3