Maximum Power-Point Tracking and Stall Control with Eddy Current Brake System on Small-Scaled Wind Turbines and its Application on Agricultural Harvesting
Volume 5, Issue 4, Page No 81-93, 2020
Author’s Name: Anupa Koswatta1, Faramarz Alsharif2, Yasushi Shiroma1, Shiro Tamaki1,a), Junji Tamura2
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1Graduate school of Engineering, University of the Ryukyus, 903-0213, Japan
2School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 090-8501, Japan
a)Author to whom correspondence should be addressed. E-mail: shiro@ie.u-ryukyu.ac.jp
Adv. Sci. Technol. Eng. Syst. J. 5(4), 81-93 (2020); 
DOI: 10.25046/aj050411
Keywords: Small-scaled Wind Turbine, MPPT control, Eddy current brake, Over-rotation, Strong wind
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This research aims to enhance the generated power of the small-scaled wind turbine using the eddy current brake system and Maximum Power Point Tracking (MPPT) control method. We analyzed the behavior of the generated power and power factor, with and without the MPPT control which implemented by eddy current brake system. Also, the feasibility of the system investigated using different wind conditions such as strong and calm wind conditions. The load data has different voltage respond to the system since its conditions depend on the day/night loads pattern, weather conditions, soil moisture. Moreover, the analogical experiment for small-scaled wind turbine blade destruction is analyzed to determine the maximum penetration value of mechanical power in order to retrieve an optimal angular velocity which resulting in provides a possible maximum power to loads. At the same time, emergency break is operated when angular velocity reaches to critical speed to avoid destruction. In the simulation, we collected the real load data from a mango farm in Okinawa prefecture in Japan. The results were analyzed through simulations for the different wind conditions. In the end of simulation, we could verify that either Maximum Power Point and emergency control are activated correspondingly.
Received: 21 May 2020, Accepted: 21 June 2020, Published Online: 12 July 2020
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