Condition monitoring of wind turbine pitch controller: A maintenance approach

Abstract

With the increase of wind power capacity worldwide, researchers are focusing their attention on the operation and maintenance of wind turbines. A proper pitch controller must be designed to extend the life cycle of a wind turbine's blades and tower. The pitch control system has two main, but conflicting, objectives: to maximize the wind energy captured and converted into electrical energy and to minimize fatigue and mechanical load. Four metrics have been proposed to balance these two objectives. Also, diverse pitch controller strategies are proposed in this paper to evaluate these objectives. This paper proposes a novel metrics approach to achieve the conflicting objectives with a maintenance focus. It uses a 100 kW wind turbine as a case study to simulate the proposed pitch control strategies and evaluate with the metrics proposed. The results are showed in two tables due to two different wind models are used.

An improved opportunistic group replacement maintenance strategy for wind turbines

“…After setting the thresholds above, the maintenance time can be confirmed according the reliability curves. In Figure 1, the reliability of subassembly 1 decreases below its threshold R (1) pr of preventive replacement at the earliest. Therefore, a maintenance opportunity is generated at the corresponding time T. Under this opportunity, subassembly 1 needs preventive replacement.…”

“…The reliability R (1) (t), R (2) (t), and R (3) (t) of three subassemblies are given in Figure 1. R (1) pr , R (2) pr , and R (3) pr are, respectively, their preset reliability thresholds of preventive replacement. R (1) or , R (2) or , and R (3) or are the corresponding thresholds of opportunistic group replacement.…”

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“…Figure 5. Costs associated with traditional maintenance strategies [39,40] The economic impact of each component failure is not equal. Failures are critical when the production process is impossible to continue.…”

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“…The size of wind turbines has increased in recent years; the commonly used wind turbine has a diameter of the sweeping area of 125 m able to produce up to 7.5 MW [3]. However, since 2016 it is more common to see wind turbines with a nominal power of 9.5 MW [4]. However, model V164-10, capable of generating up to 10 MW, is now available for sale and can be delivered for commercial installation after 2021 [5].…”