Coordination Control Strategy for Frequency Support Based on Virtual Flywheel Energy Storage System in Offshore Wind Turbines
Targeting the problem of equivalent inertia reduction in power grid when a offshore wind farm is integrated into the power grid,the paper proposes a coordination control strategy for frequency support based on virtual flywheel energy storage system(VFESS)in offshore wind turbines(OWTs),and employs a genetic algorithm to optimize the curves for the power release and absorption by VFESS.Firstly,a wide-speed operation control method is employed by OWTs to establish VFESS,supporting the grid frequency for a short time by energy release and absorption.Then considering the load disturbance,the storage capacity of VFESS,and the primary frequency regulation time of synchronized generators,the power curves for the energy release and absorption by VFESS is optimized with genetic algorithm to achieve the goal of a minimum frequency drop and frequency change rate for power systems.Finally,an example analysis shows that the OWTs using this method can provide short-time frequency support and reduce the action number of low-frequency load shedding device in the power system.
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维普
