Some scholars have pointed out that the frequency control ability of the system will decrease with the increase of wind power penetration rate in the system. In order to expand the ratio of wind energy, it is proposed to introduce frequency sensitive control link into the control system of variable speed fan unit, because of the power rapid control level of dual-feed induction generator, instantaneously release a part of the roor momentary momentum, providing the frequency support of the early stage of the system.
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