A Multi-filter based Dynamic Power Sharing Control for a Hybrid Energy Storage System Integrated to a Wave Energy Converter for Output Power Smoothing

Publication Name

IEEE Transactions on Sustainable Energy


The output-power fluctuations from the wave energy converters (WECs) with a high peak-to-average ratio need to be smoothed out before supplying power to electric loads or power grids. Usually, short-term energy storage is used to smooth out the output-power fluctuations of WECs. In this article, a novel multi-filter-based dynamic power-sharing control is devised for a hybrid energy storage system (HESS) integrated with a grid-connected WEC. An advanced model of HESS-integrated WEC consisting of a direct-drive permanent-magnet linear-generator, a supercapacitor, and a battery system is developed to test the proposed multi-filter-based dynamic control strategy. The distinguishing features of this study are: 1) the power-sharing strategy is based on a dynamic-filter that is designed to change its corner-frequency depending upon the incoming ocean wave, 2) the low and the high-frequency power-components are allocated based on ocean wave conditions, 3) the proposed strategy is suitable for the real-time control of the proposed HESS integrated with the WEC, and 4) a detailed model of the WEC is used instead of using a pre-saved power-profile. With the implementation of the proposed multi-filter-based dynamic power-sharing scheme in the HESS integrated WECs, the output-power can be effectively smoothed out before supplying the power to the grids.

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