중형 풍력터빈의 출력 및 타워 하중저감제어기 설계
Design of Power and Load Reduction Controller for a Medium-Capacity Wind Turbine
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참고문헌
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초록
A control algorithm for a 100 kW wind turbine is designed in this study. The wind turbine is operating as a variable speed variable pitch (VSVP) status. Also, this wind turbine is a permanent magnet synchronous generator (PMSG) Type. For the medium capacity wind turbine considered in this study, it was found that the optimum tip speed ratios to achieve the maximum power coefficients varied with wind speeds. Therefore a commercial blade element momentum theory and multi-body dynamics based program was implemented to consider the variation of aerodynamic coefficients with respect to Reynolds numbers and to find out the power and thrust coefficients with respect tip speed ratio and blade pitch angles. In the end a basic power controller was designed for below rated, transition and above rated regions, and a load reduction algorithm was designed to reduce tower vibration by the nacelle motion. As a result, damage equivalent Load (DEL) of tower fore-aft has been reduced by 32%. From dynamic simulations in the commercial program, the controller was found to work properly as designed. Experimental validation of the control algorithm will be done in the future.
Abstract
A control algorithm for a 100 kW wind turbine is designed in this study. The wind turbine is operating as a variable speed variable pitch (VSVP) status. Also, this wind turbine is a permanent magnet synchronous generator (PMSG) Type. For the medium capacity wind turbine considered in this study, it was found that the optimum tip speed ratios to achieve the maximum power coefficients varied with wind speeds. Therefore a commercial blade element momentum theory and multi-body dynamics based program was implemented to consider the variation of aerodynamic coefficients with respect to Reynolds numbers and to find out the power and thrust coefficients with respect tip speed ratio and blade pitch angles. In the end a basic power controller was designed for below rated, transition and above rated regions, and a load reduction algorithm was designed to reduce tower vibration by the nacelle motion. As a result, damage equivalent Load (DEL) of tower fore-aft has been reduced by 32%. From dynamic simulations in the commercial program, the controller was found to work properly as designed. Experimental validation of the control algorithm will be done in the future.
참고문헌 (5)
- Bottasso, C. L., "Development of a Wind Tunnel Model for Supporting Research on Aero-Servo-Elasticity and Control of Wind Turbines", Politecnico di Milano, 1~8 (2011)
- "NWTC Design, AirfoilPrep, NWTC Design Codes" (2010)[URL]
- DRELA, Mark, "Low Reynolds Number Aerodynamics", pp.1~12 (1989), Springer
- 남윤수, "NREL 5MW 풍력터빈의 제어시스템 설계", 한국태양에너지학회 논문집, 32(5), pp.31~40 (2012), 한국태양에너지학회
- Bossanyi, E. A., "The Design of Closed Loop Controllers for Wind Turbines", Wind Energy, 3(3), pp.149~163 (2000)