Abstract
A power take-off (PTO) system for an oscillating water column (OWC) wave energy converter comprises a turbine-generator-power converter. In this study, only the topologies of the power converter that affect the load control algorithm are compared. A power converter for renewable energy is composed of a diode-dc/dc converter and a pulse-width modulation (PWM) converter operating at small and large capacities, respectively. However, selecting a power converter according to the capacity based on the characteristics of the wave energy converter, in which the input energy is highly fluctuating, can significantly reduce the power performance. Thus, to verify load control characteristics according to the topology of the power converter, the turbine-generator-power converter was incorporated in the modeling, and the power performance based on the power converter topology under various wave conditions was analyzed. Further, torque control to obtain the maximum power among load control algorithms was applied under irregular wave conditions, and the power performance and PTO system characteristics according to the torque coefficient were analyzed. The results of this study suggested an increase in the torque coefficient of the maximum power control for the operational stability of the OWC-WEC, and it was confirmed that the RPM characteristics of the PTO system were reduced.
Highlights
Many new renewable energy systems that employ wave energy are being studied [1,2].These technologies play an important part in driving renewable energy such as wind power and solar power
It shows the change in the angular speed of the turbine and the change in power performance when the slope is increased by 200%; it is reduced to 50% compared to the load control curve that maximizes the efficiency of the turbine
The load control and output power performance based on the topology of the power converter that directly affects the load control were compared
Summary
Many new renewable energy systems that employ wave energy are being studied [1,2]. These technologies play an important part in driving renewable energy such as wind power and solar power. Hoskin et al [17] applied a phase controller to the OWC-WEC by making the attenuation factor proportional to the speed of the turbine All these studies aimed to develop a strategy to maximize conversion efficiency at the chamber stage. The most general rotational speed control-based maximum power control was applied to analyze the power generation performance based on the integrated simulation of OWC-WEC, and the characteristics analysis and power generation performance of PTO system of OWC-WEC according to the load factor control were conducted. A time domain analysis reflecting real-time control under various input wave conditions was conducted by modeling the actual PTO system of the OWC-WEC. Since this paper focuses on the performance of the load control of the power converter, the fluid dynamics of the chamber and turbine are assumed to be efficiency-based
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