Nonlinear Modelling and Control of a Power Smoothing System for a Novel Wave Energy Converter Prototype

Simon Krüner () and Christoph M. Hackl
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Simon Krüner: Graduate Center of Engineering and Design (GC-ED), Technical University of Munich (TUM) and SINN Power GmbH, 85748 Munich, Germany
Christoph M. Hackl: Laboratory for Mechatronic and Renewable Energy Systems (LMRES), Hochschule München (HM) University of Applied Sciences, 80335 Munich, Germany

Sustainability, 2022, vol. 14, issue 21, 1-17

Abstract: This contribution presents the control of the electrical system of a Wave Energy Converter (WEC) prototype developed by SINN Power. Due to the movement of the waves, the generated power has a very high fluctuation with a period of a few seconds. To be able to use this power, it has to be smoothed. The used Energy Storage System (ESS) is a supercapacitor bank, which is directly connected to the DC-link. Therefore, the DC-link voltage has to fluctuate according to the generated power, to charge and discharge the capacitors. The smoothed power is used to charge batteries with a DC/DC converter, which is typically used for photovoltaic applications. The DC-link voltage can be controlled with the current through the DC/DC converter, yielding a nonlinear control system where a stability analysis is carried out to prove a safe and stable operation. Measurement results at the prototype under typical sea conditions are presented, which fit the simulation results. With the presented control system, smooth power output can be guaranteed.

Keywords: Wave Energy Converter; power smoothing; energy storage system; supercapacitor bank; EDLC (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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