A Cost-Effective Wave Energy Harvesting System with Maximum Power Point Tracking Capability

Chandran, Pranav [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701]; Chowdhury, Vikram Roy [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]; Seo, Gab-Su [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]; Johnson, B. [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701]; Mather, Barry [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]

doi:10.1109/ecce58356.2025.11260217

DOE OSTI · 3013946

A Cost-Effective Wave Energy Harvesting System with Maximum Power Point Tracking Capability

Chandran, Pranav [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701]·Chowdhury, Vikram Roy [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]·Seo, Gab-Su [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]·Johnson, B. [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701]·Mather, Barry [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]

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Abstract

In this paper, we propose a low-cost bidirectional four-switch inverter that transfers three-phase energy between a permanent magnet synchronous generator (PMSG) driven by a wave energy collector and the power grid or a local ac load. To achieve high control performance, the machine-side inverter uses a high-gain observer for rotor position estimation and a Lyapunov-based approach for torque control. For the gridside inverter control, we estimate the filter capacitor voltage with a model reference adaptive system and control the dc-link voltage with a Lyapunov-based energy function. We also track the maximum power point from the sea waves with an integral control law that actively matches the generator impedance with that of the wave collection device. The proposed system supports both grid-following/forming modes. We validate our control design with simulation results on a 3-kW hardware setup.

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wave energy, power systems integration, control design

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Chandran, Pranav [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701], Chowdhury, Vikram Roy [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401], Seo, Gab-Su [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401], Johnson, B. [University of Texas at Austin,Chandra Family Department of Electrical and Computer Engineering,Austin,TX,78701], Mather, Barry [Power Systems Engineering Center, National Renewable Energy Laboratory,Golden,CO,USA,80401]. 2025-10-19. A Cost-Effective Wave Energy Harvesting System with Maximum Power Point Tracking Capability. https://doi.org/10.1109/ecce58356.2025.11260217

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