Application of PMSM for electric generation from ocean waves by EPEW

Nowadays there are different devices for harvesting ocean wave power, but there is not a commercial device to generate electricity from ocean wave. In this paper power take-off system of new device EPEW¹ is surveyed. A 40 HP permanent magnet synchronous machine is coupled with EPEW's crank shaft (PTO), so that wave power is converted to AC electricity. Generated voltage and current wave form for optimum power conversion state of PMSM is simulated in the paper and Torque-Angular velocity figure of PMSM is plotted according to the simulation results, also device efficiency in converting wave power to mechanical and electrical power is surveyed. PMSM efficiency in converting crank shaft motive force to electrical power has been achieved 32%. According to the results EPEW's efficiency in converting wave power to electrical is achieved 5% more than other wave power convertors (OWC).