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Design and Validation of Demanded Power Point Tracking Control Algorithm of Wind Turbine
김관수,김현규,김철진,백인수,Carlo L. Bottasso,Filippo Campagnolo 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.3
Simple demanded power point tracking (DPPT) control algorithms with a mode switch are proposed and experimentally validated in this study. One is a torque-based control and uses the generator torque with fixed blade-pitch angle. The other is blade-pitch based and uses both the generator torque and blade pitch for DPPT control. Both control algorithms receive power demand from a higher-level controller and use their control strategies to track it. The two DPPT control algorithms were integrated with the basic torque and pitch control algorithms, and simulations using an in-house code and a high fidelity multi-body dynamic aeroelastic code were performed for steady and dynamic conditions. To verify the algorithms experimentally, wind tunnel tests with a scaled wind turbine having active pitch control capability were performed. From the simulation and the test, the proposed DPPT algorithms integrated into the conventional control algorithm were found to work well with the basic wind turbine power control algorithm. The torque-based control showed better performance in terms of power tracking, but the pitch-based control showed better performance in terms of loading.
Nam, Yoon-Su,Kim, Jeong-Gi,Bottasso, Carlo L. 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.6
The rotational speed of a wind turbine is limited by the noise constraint of the blade tip speed. The larger the rotor diameter is, the smaller the rotor speed becomes. Therefore, there exists a transition region connecting the max-Cp operation with the power regulation operation. A conventional pitch schedule in this region involves using a fixed pitch. However, if the variable pitch instead of the fixed one is allowed, more electric power can be extracted from the wind. The benefit of using this strategy is analyzed from the point of how much the electric energy can be gained by applying the variable pitch schedule in this transition region.
A Method to Estimate Bending Moments Acting on a Wind Turbine Blade Specimen Using FBG Sensors
김창환,백인수,김광수,김형규,유능수,남윤수,Filippo Campagnolo,Carlo Bottasso 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
A new method to estimate bending moments of a blade specimen having a constant cross section throughout was developed using fiber Bragg grating sensors. Based on theories of solid mechanics, strains of the simplified model of the specimen were evaluated for various pitching angles and the forces exerted. It was found by both theory and experiment that at least two FBG sensors are necessary to find out the magnitude and direction of the load acting on the specimen from measured longitudinal strain information. A method was also found to estimate the flatwise and edgewise bending moments from the measured strains. An experimental setup that enables pitching the specimen from 0° to 180° was used to experimentally verify the theoretical findings. The theory and the experimental results showed a fair agreement.
A Method to Estimate Bending Moments Acting on a Wind Turbine Blade Specimen Using FBG Sensors
Kim, Chang-Hwan,Kim, Kwan-Soo,Kim, Hyun-Gyu,Paek, In-Su,Yoo, Neung-Soo,Nam, Yoon-Su,Campagnolo, Filippo,Bottasso, Carlo 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.7
A new method to estimate bending moments of a blade specimen having a constant cross section throughout was developed using fiber Bragg grating sensors. Based on theories of solid mechanics, strains of the simplified model of the specimen were evaluated for various pitching angles and the forces exerted. It was found by both theory and experiment that at least two FBG sensors are necessary to find out the magnitude and direction of the load acting on the specimen from measured longitudinal strain information. A method was also found to estimate the flatwise and edgewise bending moments from the measured strains. An experimental setup that enables pitching the specimen from $0^{\circ}$ to $180^{\circ}$ was used to experimentally verify the theoretical findings. The theory and the experimental results showed a fair agreement.