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Open AccessArticle

An Improved Power Control Approach for Wind Turbine Fatigue Balancing in an Offshore Wind Farm

1
School of Electronic and Information Engineering, Tongji University, Shanghai 201804, China
2
Institute of Control Systems, University of Kaiserslautern, 67663 Kaiserslautern, Germany
3
Department of Wind Energy, Technical University of Denmark, DK-2800 Lyngby, Denmark
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1549; https://doi.org/10.3390/en13071549
Received: 28 January 2020 / Revised: 20 March 2020 / Accepted: 22 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue Machine Learning for Energy Systems)
Increasing maintenance costs will hinder the expansion of the wind power industry in the coming decades. Training personnel, field maintenance, and frequent boat or helicopter visits to wind turbines (WTs) is becoming a large cost. One reason for this cost is the routine turbine inspection repair and other stochastic maintenance necessitated by increasingly unbalanced figure loads and unequal turbine fatigue distribution in large-scale offshore wind farms (OWFs). In order to solve the problems of unbalanced fatigue loads and unequal turbine fatigue distribution, thereby cutting the maintenance cost, this study analyzes the disadvantages of conventional turbine fatigue definitions. We propose an improved fatigue definition that simultaneously considers the mean wind speed, wind wake turbulence, and electric power generation. Further, based on timed automata theory, a power dispatch approach is proposed to balance the fatigue loads on turbines in a wind farm. A control topology is constructed to describe the logical states of the wind farm main controller (WFMC) in an offshore wind farm. With this novel power control approach, the WFMC can re-dispatch the reference power to the wind turbines according to their cumulative fatigue value and the real wind conditions around the individual turbines in every power dispatch time interval. A workflow is also designed for the control approach implementation. Finally, to validate this proposed approach, wind data from the Horns Rev offshore wind farm in Denmark are used for a numerical simulation. All the simulation results with 3D and 2D figures illustrate that this approach is feasible to balance the loads on an offshore wind farm. Some significant implications are that this novel approach can cut the maintenance cost and also prolong the service life of OWFs. View Full-Text
Keywords: wind turbine; maintenance; fatigue; power control; offshore wind farm wind turbine; maintenance; fatigue; power control; offshore wind farm
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MDPI and ACS Style

Zhao, R.; Dong, D.; Li, C.; Liu, S.; Zhang, H.; Li, M.; Shen, W. An Improved Power Control Approach for Wind Turbine Fatigue Balancing in an Offshore Wind Farm. Energies 2020, 13, 1549.

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