This paper describes an autonomous control system of a renewable wave power plant named "CHUJEON A", which is a prototype of renewable floating wave energy device. A wound rotor induction machine is adopted as an energy conversion device of CHUJEON A. The control system of the CHUJEON A supplies the excitation currents for induction generator, changes the number of poles with rotor speed, adjusts the local load with output power of generator, and controls the emergency gasoline engine generator with battery status autonomously. The configuration of autonomous control system and some experimental results are illustrated in this paper.
The demands for renewable energy device has grown during last few years because of the limits of fossil fuels and the negative environmental impacts of burning fossil fuels. The wave energy devices have lately attracted considerable attention together with wind energy devices. Korea Ocean Research and Development Institute (KORDI) has developed a prototype of 60kW class wave energy device named "CHUJEON A"(Fig. 1). The plant has 18.6m overall height, 13m outer diameter, and 10m inner diameter, and it has an air chamber inside. The CHUJEON-A is a floating type wave energy device moored by four-point compliant buoy anchoring on the bottom of shallow sea (Fig. 2) (Hong S. W., 2002). The design of structures and mooring system for CHUJEON-A are out of work-scope of this study. The main concerns of this paper are the control and electric power conversion system of the plant. The main purpose of CHUJEON-A project is to examine the possibilities for practical use of wave power plant in east seashore of Korea by gathering and analyzing the data related to the energy conversion such as wave height, wind speed and direction, rotating speed of turbine, output power, and so on.