An Analysis of Variable-Speed Wind Turbine Power-Control Methods with Fluctuating Wind Speed

Yun-Su Kim, Il-Yop Chung and Seung-Il Moon
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Yun-Su Kim: School of Electrical Engineering and Computer Science, Seoul National University, Seoul 151-742, Korea
Il-Yop Chung: School of Electrical Engineering, Kookmin University, Seoul 136-702, Korea
Seung-Il Moon: School of Electrical Engineering and Computer Science, Seoul National University, Seoul 151-742, Korea

Energies, 2013, vol. 6, issue 7, 1-16

Abstract: Variable-speed wind turbines (VSWTs) typically use a maximum power-point tracking (MPPT) method to optimize wind-energy acquisition. MPPT can be implemented by regulating the rotor speed or by adjusting the active power. The former, termed speed-control mode (SCM), employs a speed controller to regulate the rotor, while the latter, termed power-control mode (PCM), uses an active power controller to optimize the power. They are fundamentally equivalent; however, since they use a different controller at the outer control loop of the machine-side converter (MSC) controller, the time dependence of the control system differs depending on whether SCM or PCM is used. We have compared and analyzed the power quality and the power coefficient when these two different control modes were used in fluctuating wind speeds through computer simulations. The contrast between the two methods was larger when the wind-speed fluctuations were greater. Furthermore, we found that SCM was preferable to PCM in terms of the power coefficient, but PCM was superior in terms of power quality and system stability.

Keywords: power coefficient; power quality; wind-speed fluctuations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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