Currently, research on the control of wind power and energy storage to participate in frequency regulation and configuration of the energy storage capacity is at its nascent stage. Similar to wind generators, energy storage can be involved in system frequency regulation through additional differential-droop control.
In the power systems with high proportion of renewable power generation, wind turbines and energy storage devices can use their stored energy to provide inertia response and participate in primary frequency regulation for the improved system frequency stability.
Coordinated control structure of wind power and energy storage. Secondly, the controller parameters of energy storage are evaluated according to the frequency regulation requirements of the system. Finally, the evaluation parameters are sent into the additional controllers to provide reliable frequency support.
Configuration of energy storage capacity under grid-connected standard. According to the above analysis, to meet the needs of frequency regulation and meet the standards of grid-connected wind power systems, the capacity proportion λ b of the energy storage devices can be expressed as, (17) λ b = max {λ b1, λ b2}
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