Abstract
Tidal current is the flow of sea water due to the tidal phenomenon. Therefore it is possible to predict generated output of the tidal current power generation system, which is more advantageous than other renewable energy sources, when the system is connected to the power system and operated. In this paper, we propose the tidal current power generation system which can be controlled to variable speeds. The generator is a doubly fed induction generator which can reduce the inverter capacity in comparison with a synchronous generator. We examine the gear ratio and generator capacity which maximize generated energy, when the tidal current power generation system is operated using the maximum power point tracking, constant turbine output, constant stator active power, and constant rotor supply voltage control method. This paper shows that the constant rotor supply voltage control method increases generated energy and capacity factor more than other control methods.
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