Abstract
Energy storage can cooperate with wind turbines to improve the system frequency stability because of its flexible four-quadrant power adjustment capability. Aiming at the problem of optimal operation and distributed control of the energy storage system in the existing wind-storage joint frequency modulation, based on the distributed consensus theory, design a method of global information perception of energy storage, further aiming to minimize the operating costs of energy storage that assist in frequency regulation of wind farms, consider the energy storage operating state and system power balance constraints, and use marginal cost consistency iteration and power balance correction, finally propose a distributed optimization control strategy for the energy storage system of wind-storage joint frequency regulation. This strategy can correct the marginal cost and power output of the iterative process of energy storage unit based on the total output power and dispatched total power of the energy storage perceived by the global information, so as to ensure the power balance between the supply and demand of the energy storage, and realize the optimal economic operation of the system. The simulation results show that the proposed strategy can optimize the state of charge of the energy storage unit, reduce the frequency regulation cost of the energy storage system, and has good economy and robustness.
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