Multi-Timescale Lookup Table Based Maximum Power Point Tracking of an Inverse-Pendulum Wave Energy Converter: Power Assessments and Sensitivity Study

Xuhui Yue (), Jintao Zhang, Feifeng Meng, Jiaying Liu, Qijuan Chen and Dazhou Geng
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Xuhui Yue: PowerChina HuaDong Engineering Corporation Limited, Hangzhou 311122, China
Jintao Zhang: PowerChina HuaDong Engineering Corporation Limited, Hangzhou 311122, China
Feifeng Meng: PowerChina HuaDong Engineering Corporation Limited, Hangzhou 311122, China
Jiaying Liu: PowerChina HuaDong Engineering Corporation Limited, Hangzhou 311122, China
Qijuan Chen: Key Laboratory of Transients in Hydraulic Machinery, Ministry of Education, Wuhan University, Wuhan 430072, China
Dazhou Geng: China Renewable Energy Engineering Institute, Beijing 100120, China

Energies, 2023, vol. 16, issue 17, 1-25

Abstract: A novel, inverse-pendulum wave energy converter (NIPWEC) is a device that can achieve natural period control via a mass-position-adjusting mechanism and a moveable internal mass. Although the energy capture capacity of a NIPWEC has already been proven, it is still meaningful to research how to effectively control the NIPWEC in real time for maximum wave energy absorption in irregular waves. This paper proposes a multi-timescale lookup table based maximum power point tracking (MLTB MPPT) strategy for the NIPWEC. The MLTB MPPT strategy was implemented to achieve a theoretical “optimal phase” and “optimal amplitude” by adjusting both the position of the internal mass and linear power take-off (PTO) damping. It consists of two core parts, i.e., internal mass position adjustment based on a 1D resonance position table and PTO damping tuning based on a 2D optimal PTO damping table. Furthermore, power assessments and sensitivity study were conducted for eight irregular-wave sea states with diverse wave spectra. The results show that energy period resonance and the lookup table based PTO damping tuning have the highest possibility of obtaining the maximum mean time-averaged absorbed power. Additionally, both of them are robust to parameter variations. In the next step, the tracking performance of the MLTB MPPT strategy in terms of changing sea states will be studied in-depth.

Keywords: wave energy converter; maximum power point tracking; multi-timescale lookup table; internal-mass position adjustment; PTO damping tuning; power assessments; sensitivity study (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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