Propagation and Elimination of Torque Ripple in A Wind Energy Conversion System

Dessaint,; Nakra,; Mukhedkar,

doi:10.1109/mper.1986.5528012

Cited by 4 publications

(5 citation statements)

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“…This can be tuned to minimize power fluctuations and drivetrain vibrations. (For instance, this is shown in the work of Lefebvre et al and Dessaint et al , as well as the recent study by Svendsen and Merz .) Small adjustments in the speed can be used to compensate for degraded aerodynamics when the blades are soiled or eroded; constant‐speed turbines can see large reductions in maximum power output .…”

Section: Optimum Stall‐regulated Bladesmentioning

confidence: 99%

Rapid optimization of stall-regulated wind turbine blades using a frequency-domain method: Part 2, cost function selection and results

Merz

2014

Wind Energ.

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A fast and effective frequency‐domain optimization method was developed for stall‐regulated blades. It was found that when using linearized dynamics, typical cost functions employing damage‐equivalent root bending moments are not suitable for stall‐regulated wind turbines: when the cost function is minimized, the edgewise damping can be low, and the flapwise damping can approach zero during an extreme operating gust. A new cost function is proposed that leads to nicely balanced stall behavior and damping over the entire operating windspeed range. The method was used to design the blades of two multi‐MW, stall‐regulated, offshore wind turbines, comparable with the NREL 5 MW and NTNU 10 MW pitch‐regulated turbines. It is shown that the optimal stall‐regulated blade has a unique aerodynamic profile that gives high flapwise and edgewise damping and a uniform mean power output above the rated windspeed. The blades are described in sufficient detail that they can be used in further aeroelastic analyses, to compare large stall‐regulated and pitch‐regulated turbines. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Optimum Stall‐regulated Bladesmentioning

confidence: 99%

Rapid optimization of stall-regulated wind turbine blades using a frequency-domain method: Part 2, cost function selection and results

Merz

2014

Wind Energ.

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“…On the other side of the problem, torque ripples originated at the load have not received the same attention, whereas their existence in many systems such as wind turbine, diesel, and gas engines and eccentricity loads cannot be underemphasised [13–19]. To elaborate, wind turbines suffer from torque harmonics as a result of tower shadowing and wind shears, which can affect the power quality or coincide with the system natural frequency leading to the deterioration of the mechanical parts [13, 14]. Moreover, in the combustion process in an engine generate torque harmonics that reduce efficiency and increase vibrations [15–17].…”

Section: Introductionmentioning

confidence: 99%

“…As an effort to regulate the power output of wind turbines, Dessaint et al . [13] have combined a PMSM along with a static frequency changer to control the DC link current and attenuate the torque at the shaft. In [14], an electromagnetic braking system was employed to counteract the torque ripples in the shaft; alternatively, a PMSM can be proposed to achieve the same purpose.…”

Section: Introductionmentioning

confidence: 99%

Cancellation of harmonic torque disturbance in permanent magnet synchronous motor drives by using an adaptive feedforward controller

Abou-Qamar

Hatziadoniu

2018

IET Power Electronics

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The effects of disruptive harmonic torque disturbances on permanent magnet synchronous motor drives originating at the mechanical load or from cogging can be mitigated by producing a counteracting electric torque. The study proposes using an adaptive feedforward controller (AFC) for this purpose. The AFC is designed to operate as an auxiliary loop in parallel with a field-oriented controller, which provides speed control. The AFC input is the motor speed control error. The loop is tuned at the frequency of the harmonic torque and its output is added to the q-axis current reference as a variation current of the same frequency. The main advantage of the proposed method is that it does not require an estimation of the disturbance torque. The theoretical analysis of the scheme is presented in the study. Experimental results are also presented in the study from a motor drive system where the mechanical load produces harmonic torques. The results demonstrate the effectiveness of the AFC in significantly reducing speed oscillations by cancelling the effect of the torque harmonic disturbance.

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“…Thus, the quality of a WECS controller is determined by its capacity to deal with unmodelled dynamics, exogenous R. Rocha stochastic signal, and periodic disturbances. Although classic methods are traditionally utilized for WECS control design [2], [3], these solutions are not completely adequate since the resulting controllers are not able to provide necessary robustness to plant uncertainties, such as parameter variations, nonlinear behavior, etc. On the other hand, a conventional PID controller does not add a sufficient damping to WECS [4].…”

Section: Introductionmentioning

confidence: 99%

A sensorless control for wind turbine

Rocha

2009

2009 17th Mediterranean Conference on Control and Automation

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This paper presents a sensorless control for a stall regulated variable speed wind turbine, where the speed reference is obtained from the estimated aerodynamic torque. The LQG/LTR methodology is applied to the design of an optimal discrete-time feedback controller for a Wind Energy Conversion System, aiming to maximize the efficiency on energy conversion and to minimize the detrimental dynamic loads due to wind fluctuation and ripple torque. The trade-off between the efficiency maximization of the energy conversion and the dynamic load effects minimization is considered in the quadratic cost function of the LQG/LTR design. The resulting control structure is simulated considering a step variation on wind speed. The performance of the proposed control scheme is discussed showing that it really leads the WECS operation near to the maximum efficiency point and reduces the detrimental dynamic loads. It is also presented some alternatives for sensorless control for the electrical generator.

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Propagation and Elimination of Torque Ripple in A Wind Energy Conversion System

Cited by 4 publications

References 0 publications

Rapid optimization of stall-regulated wind turbine blades using a frequency-domain method: Part 2, cost function selection and results

Rapid optimization of stall-regulated wind turbine blades using a frequency-domain method: Part 2, cost function selection and results

Cancellation of harmonic torque disturbance in permanent magnet synchronous motor drives by using an adaptive feedforward controller

A sensorless control for wind turbine

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