Energy management systems (EMSs) have been widely developed for efficient energy usage. Optimization of operation of energy consuming plants is one of key technologies in EMS. In this paper, we propose a very fast optimization method for optimal load distribution problems by which we can implement optimizing functions on microcomputers without high speed CPU or rich RAM. The proposing method consists of two phases, offline formula manipulation phase and online fast calculation phase. We show that the proposing method can give a strict optimal solution without any violation of constraints within 96 times shorter time than a traditional gradient method. The proposing method can contribute low cost and ubiquitous optimization for EMS.
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