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Optimal Efficiency Analysis of MW-Level Direct-Drive Wind Generation System

Author(s): Jingyuan Yin*, Xinmin Jin, Xuezhi Wu
School of Electrical Engineering, Beijing Jiaotong University, Haidian District 100044, Beijing, China
International Journal of Smart Grid and Clean Energy, vol. 2, no. 2, May 2013: pp. 244–251
ISSN: 2315-4462
Digital Object Identifier: 10.12720/sgce.2.2.244-251  

Abstract: Given the MW-level direct-drive wind generation system, the optimal efficiency of generators and converters is analyzed. The loss model of the generators including iron loss and the neutral point clamping three-level converters is established. Based on the loss model and the voltage, current limit, the generators and converters, optimal efficiency analytic expressions of direct current are obtained by analyzing the relationships of direct current and loss under given torque, and then  optimal efficiency solution of the wind system is got. Finally, Simulation and experiment results on a 2MW "back to back" PWM converter prototype indicate: in the fixed torque and speed condition, such optimal efficiency control is more efficient than the traditional control strategy not only on the generator or converter efficiency but also on the wind generation system.
Keywords: Wind generation system, permanent magnet synchronous generator, three-level converter, optimal efficiency

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