PROJECT TITLE :

Experimental Confirmation of Nonlinear-Model- Predictive Control Applied Offline to a Permanent Magnet Linear Generator for Ocean-Wave Energy Conversion

ABSTRACT:

To any maximize power absorption in both regular and irregular ocean wave environments, nonlinear-model-predictive management (NMPC) was applied to a model-scale point absorber developed at the University of California Berkeley, Berkeley, CA, USA. The NMPC strategy needs a power-takeoff (PTO) unit that would be turned on and off, as the generator would be inactive for up to 60p.c of the wave amount. To substantiate the effectiveness of this NMPC strategy, an in-house-designed permanent magnet linear generator (PMLG) was chosen because the PTO. The time-varying performance of the PMLG was 1st characterised by dry-bench tests, using mechanical relays to control the electromagnetic conversion method. The on/off sequencing of the PMLG was tested under regular and irregular wave excitation to validate NMPC simulations using control inputs obtained from running the selection optimizer offline. Experimental results indicate that successful implementation was achieved and absorbed power using NMPC was up to fifty% larger than the passive system, which utilised no controller. Previous investigations into MPC applied to wave energy converters have lacked the experimental results to verify the reported gains in power absorption. But, after considering the PMLG mechanical-to-electrical conversion efficiency, the electrical power output wasn't consistently maximized. To boost output power, a mathematical relation between the potency and damping magnitude of the PMLG was inserted in the system model to maximize the electrical power output through continued use of NMPC which helps separate this work from previous investigators. Of significance, results from latter simulations provided a damping time series that was active over a bigger portion of the wave period requiring the actuation of the applied electrical load, instead of on/off management.