Abstract
The fluctuation of active power output of wind farm has many negative impacts on large-scale wind power integration into power grid. In this paper, flywheel energy storage system (FESS) was connected to AC side of the doubly-fed induction generator (DFIG) wind farm to realize smooth control of wind power output. Based on improved wind power prediction algorithm and wind speed-power curve modeling, a new smooth control strategy with the FESS was proposed. The requirement of power system dispatch for wind power prediction and flywheel rotor speed limit were taken into consideration during the process. While smoothing the wind power fluctuation, FESS can track short-term planned output of wind farm. It was demonstrated by quantitative analysis of simulation results that the proposed control strategy can smooth the active power fluctuation of wind farm effectively and thereby improve power quality of the power grid.
Highlights
With large-scale wind power integration into grid, the fluctuation of active power output of wind farm has turned the operation and control of power system much more difficult [1]
This paper proposed a new flywheel energy storage system (FESS) control strategy applicable to smooth short-term wind power fluctuation on the platform of doubly-fed induction generator (DFIG) and FESS power generation system
The demand of power grid dispatch for wind power prediction was taken into consideration
Summary
With large-scale wind power integration into grid, the fluctuation of active power output of wind farm has turned the operation and control of power system much more difficult [1]. Flywheel energy storage system (FESS) is features with rapid charging and discharging, long periodic service life and environmental pollution free, which is applicable to smooth short-term wind power fluctuation [11]. In reference [12, 13], FESS is used to realize smooth control over active power output of wind farm. A FESS is designed and a reference power calculation method based on filter is studied to determine the operation state of the FESS in reference [13] In these control methods, the role of FESS to track planned output of wind power has not been taken into consideration and corresponding control strategies are seldom discussed in research. The energy storage system can track short-term planned output power of wind farm and smooth the wind power fluctuation simultaneously. A simulation system referred to reference [13] was established on the Matlab/Simulink for analysis, which proved the correctness and effectiveness of the proposed smooth control strategy
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