Research Papers

Research on Joint Power and Loads Control for Large Scale Directly Driven Wind Turbines

[+] Author and Article Information
JuChuan Dai

School of Electromechanical Engineering,
Hunan University of Science and Technology,
Xiangtan 411201, China;
College of Mechanical and Electrical Engineering
of Central South University,
Changsha 410083, China
e-mail: daijuchuan@gmail.com

Deshun Liu, Yanping Hu

School of Electromechanical Engineering,
Hunan University of Science and Technology,
Xiangtan 411201, China

Xiangbing Shen

Hara XEMC Windpower Co., Ltd.,
Xiangtan 411102, China

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received June 19, 2012; final manuscript received September 24, 2013; published online November 19, 2013. Assoc. Editor: Christian Masson.

J. Sol. Energy Eng 136(2), 021015 (Nov 19, 2013) (10 pages) Paper No: SOL-12-1159; doi: 10.1115/1.4025707 History: Received June 19, 2012; Revised September 24, 2013

Emphasis of this article is on the dynamic characteristics analysis of individual pitch control for MW scale directly driven wind turbines with permanent magnet synchronous generator (PMSG). The pitch control objectives were analyzed and the objective expressions were deduced, including power expression, loads expression, and vibration expressions of blade and tower. Then, both the collective pitch control aiming at power control and the individual pitch control strategy aiming at joint power and loads control were analyzed, too. The blade root bending moments and the actual capture power of wind rotor were employed to be the control variables. The power was calculated based on the conventional measured parameters of wind turbines. In order to reflect the difference between the pitch angle command value and the actual value, the pitch actuator dynamic model was used. The research results show that both the collective pitch control strategy and the proposed individual pitch control strategy can effectively control the power injected into grid; moreover, the individual pitch control can reduce fatigue loads; while in the process of individual pitch control, the actual variation of blade pitch angle is closely related to not only the inflow speed but also the blade azimuth angle; individual pitch control strategy can reduce the variation amplitude of flapwise moments, but has little influence on the edgewise moments.

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Fig. 1

Coordinate systems for wind turbines

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Fig. 2

Control scheme of directly driven PMSG wind turbines

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Fig. 6

Individual pitch control structure of directly driven PMSG wind turbines

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Fig. 7

Pitch actuator model

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Fig. 5

Joint power and loads control scheme

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Fig. 3

PI controller for collective pitch control

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Fig. 4

Collective pitch control of directly driven PMSG wind turbines

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Fig. 10

Blade root bending moments of wind turbines: (a) blade root edgewise moment and (b) blade root flapwise moment

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Fig. 9

Wind rotor rotational speed and power injected into grid: (a) wind rotor rotational speed and (b) power injected into grid

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Fig. 11

Tilt and yaw moments at hub: (a) tilt moment at hub and (b) yaw moment at hub

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Fig. 8

Wind speed and actual pitch angle: (a) wind speed at hub and (b) actual pitch angle of blade



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