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Abstract

—This paper focuses on developing a powermanagement system (PMS) for a grid connected oscillatingwater column (OWC) wave energy converter with abattery/supercapacitor hybrid energy storage system. The mainobjective of the PMS is to transfer large power pulses present inthe input to the energy storage elements and thereby maintainsmooth power delivery to the grid. In addition, maintaining stateof charge (SOC) of the battery and supercapacitor within safelimits and ensuring sufficient reserves are other objectives of thePMS. In the proposed PMS, power sharing between energystorage elements is determined based on the deviation of thesupercapacitor SOC from the mid-point and its rate of change.Moreover, the power commitment to the grid is adjusted basedon the deviation of battery SOC from the mid-point and its rateof change. Successful operation of the proposed PMS is verifiedusing MATLAB/Simulink simulations. Apart from that, thevariable speed operation of the turbine is also simulated toobserve its effect on the supercapacitor sizing. Simulationresults show that the variable speed operation help reducerequired capacity of the supercapacitor.

Item Type:	Conference Publication
Authors/Creators:	Rajapakse, G and Jayasinghe, S and Fleming, A
Keywords:	Hybrid energy storage system, Li-Ion battery energy storage, oscillating water column wave energy converter, power management system, supercapacitor energy storage
Journal or Publication Title:	Proceedings of 2018 8th International Conference on Power and Energy Systems (ICPES)
Publisher:	IEEE Computer Society
DOI / ID Number:	https://doi.org/10.1109/ICPESYS.2018.8626942
Copyright Information:	Copyright 2018 IEEE
Related URLs:	Google Scholar: Fleming, A UTAS Profile: Fleming, A
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