DocumentCode :
743865
Title :
Wind Power Fluctuation Smoothing Controller Based on Risk Assessment of Grid Frequency Deviation in an Isolated System
Author :
Jin Lin ; Yuanzhang Sun ; Yonghua Song ; Wenzhong Gao ; Sorensen, Poul
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
Volume :
4
Issue :
2
fYear :
2013
fDate :
4/1/2013 12:00:00 AM
Firstpage :
379
Lastpage :
392
Abstract :
Wind power fluctuation raises the security concern of grid frequency deviation, especially for an isolated power system. Thus, better control methodology needs to be developed to smooth the fluctuation without excessive spillage. Based on an actual industrial power system, this paper proposes a smoothing controller to suppress the power fluctuation from doubly-fed induction generator (DFIG)-based wind farm. This controller consists of three main functionality components: risk assessment model, wind turbine rotor speed optimizer, and rotor speed upper limiter. In order to avoid unnecessary energy loss, this paper designs a risk assessment model of grid frequency deviation, which is capable of locally estimating the maximum grid frequency deviation risk of the next dispatch cycle. A wind turbine speed optimizer then uses the estimated frequency deviation risk to search for the optimal power curve with reduced output so that a trade-off between fluctuation smoothing and energy loss is achieved. Subsequently, the controller limits the maximum rotor speed to shift down the power curve of wind power plant based on the optimal wind turbine rotor speed. Therefore, the power fluctuation is smoothed along with the down-regulated power curve. A numerical case study demonstrates the effectiveness and economy of this smoothing controller for the studied isolated system.
Keywords :
angular velocity control; asynchronous generators; frequency control; frequency estimation; losses; power control; power generation control; power generation dispatch; power generation economics; power grids; power system security; risk management; wind power plants; wind turbines; DFIG; dispatch cycle; doubly-fed induction generator; energy loss; industrial power system; isolated power system; maximum grid frequency deviation risk estimation; maximum rotor speed controller; optimal down-regulated power curve; power system economics; risk assessment model; rotor speed upper limiter; security concern; wind farm; wind power fluctuation smoothing controller; wind power plant; wind turbine rotor speed optimizer; Frequency control; Rotors; Smoothing methods; Wind farms; Wind power generation; Wind speed; Wind turbines; “Time-Frequency” assessment model; Binary search algorithm; doubly-fed induction generator (DFIG); energy loss; frequency deviation; maximum speed limiter; power fluctuation;
fLanguage :
English
Journal_Title :
Sustainable Energy, IEEE Transactions on
Publisher :
ieee
ISSN :
1949-3029
Type :
jour
DOI :
10.1109/TSTE.2012.2225853
Filename :
6387354
Link To Document :
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