Power Smoothing of a Variable-Speed Wind Turbine Generator in Association With the Rotor-Speed-Dependent Gain

This paper proposes a power-smoothing scheme for a variable-speed wind turbine generator (WTG) that can smooth out the WTG's fluctuating power caused by varying wind speeds, and thereby keep the system frequency within a narrow range. The proposed scheme employs an additional loop based on the...

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Bibliographic Details
Published in:IEEE transactions on sustainable energy 2017-07, Vol.8 (3), p.990-999
Main Authors: Kim, Yeonhee, Kang, Moses, Muljadi, Eduard, Park, Jung-Wook, Kang, Yong Cheol
Format: Article
Language:English
Subjects:
Buses (vehicles)
Fluctuation
Fluctuations
Frequency control
Frequency deviation
frequency deviation loop
Maximum power
Maximum power point trackers
Motors
power smoothing
POWER TRANSMISSION AND DISTRIBUTION
Rotor speed
rotor-speed-dependent gain
Rotors
Simulation
Smoothing
stable operation
Variations
Voltage control
Wind power generation
Wind speed
Wind turbines
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Summary:This paper proposes a power-smoothing scheme for a variable-speed wind turbine generator (WTG) that can smooth out the WTG's fluctuating power caused by varying wind speeds, and thereby keep the system frequency within a narrow range. The proposed scheme employs an additional loop based on the system frequency deviation that operates in conjunction with the maximum power point tracking (MPPT) control loop. Unlike the conventional, fixed-gain scheme, its control gain is modified with the rotor speed. In the proposed scheme, the control gain is determined by considering the ratio of the output of the additional loop to that of the MPPT loop. To improve the contribution of the scheme toward maintaining the frequency while ensuring the stable operation of WTGs, in the low rotor speed region, the ratio is set to be proportional to the rotor speed; in the high rotor speed region, the ratio remains constant. The performance of the proposed scheme is investigated under varying wind conditions for the IEEE 14-bus system. The simulation results demonstrate that the scheme successfully operates regardless of the output power fluctuation of a WTG by adjusting the gain with the rotor speed, and thereby improves the frequency-regulating capability of a WTG.
ISSN:1949-3029
1949-3037
DOI:10.1109/TSTE.2016.2637907