Abstract
Wind turbines (WTs) participate in frequency regulation, which is one of the means to solve the problem of inadequate regulation capacity in power systems with a high proportion of renewable energy. The doubly fed induction generator (DFIG) can reserve part of power to achieve bidirectional regulation capability through rotor over-speed and increasing pitch angle. In this paper, it is pointed out that the available bidirectional regulation power of the WT is constrained by the maximum regulation power under the rotor speed regulation. The regulation power constraints under the pitch regulation considering the time scale are calculated. The adjustment coefficient of WT participating in frequency regulation is designed. Considering the regulation power constraints, the frequency difference interval in which the WT can provide the regulation power according to the adjustment coefficient is analyzed. The rotor speed and pitch coordinated control strategy of DFIG with different wind speeds is designed. Based on 24-hour measured data from a wind farm, the power constraints and their effects of WTs in the wind farm participating in frequency regulation are verified by simulation. The regulation power of the wind farm, frequency quality, and wind power utilization under the different control strategies are analyzed. The results show that the effects of bidirectional power constraints must be taken into account when evaluating the effectiveness of WTs in continuous frequency regulation.
Highlights
The global wind power market remained above 50 GW in 2017
The above analysis shows that the available bidirectional regulation power of the Wind turbines (WTs) obtained by the rotor speed regulation is small at medium wind speeds, and in order to get larger regulation power, the pitch angle should be adjusted to meet the demand of larger regulation power
doubly fed induction generator (DFIG) can reserve a part of power and participate in the bidirectional frequency regulation under the rotor speed and pitch coordinated control
Summary
The global wind power market remained above 50 GW in 2017. Total installations in 2017 were. There are three control methods for DFIGs participating in primary frequency regulation, including virtual inertia control, rotor speed control and pitch control. References [8,9] pointed out that the WT can only participate in frequency regulation for a short time by the virtual inertia control, because there is no reserved power in the WT, so it is impossible to support system frequency in a long term. After the inertial response, the wind power will be lower than the initial value as the speed decreases, which increases the additional demand for regulation power [18] For this reason, this paper does not consider the virtual inertia control frequency regulation method. The research of this paper provided a theoretical basis for WTs participating in the long term continuous frequency regulation, especially for the primary frequency regulation research of high penetration wind power system
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