Abstract
Energy storage systems used for the flexible grid connection of wind farms in terms of minute time-scale usually consist of batteries. Due to the capacity constraints of batteries, when wind energy fluctuations exceed limits continuously, this type of energy storage system topology cannot present good performance. To solve this problem, this paper introduces a hybrid energy storage system (HESS) topology consisting of batteries and a hydrogen conversion system (HCS). To achieve a flexible wind farm grid connection with a minimum energy loss, a HESS control strategy is proposed to make full use of the advantages of the HCS capacity and battery energy conversion efficiency. The optimization goal is to minimize power fluctuations, battery life consumption, and energy loss. The energy conversion characteristics of the flexible wind farm grid-connection system are also analyzed. The simulation results show that compared with other strategies using only batteries, the operating strategy using the HESS with the same cost can combine the advantages of the battery efficiency and HCS power continuity to achieve a balance between the controlling energy loss and smoothing power fluctuations.
Highlights
Wind power has been widely used due to its clean and environmentally friendly characteristics
The Irish ESB company [3] advises that the active power output change limit is 5% of the installed capacity within arbitrary 15 minutes when the installed capacity is less than 100 MW, 4% when the installed capacity is less than 200 MW, and 2% when the installed capacity is greater than 200 MW
In terms of the operational control objective, the above-mentioned studies mainly focus on how to maximize the smooth grid-connected power of wind power without optimizing the energy loss generated by the energy storage system in the process of energy conversion
Summary
Wind power has been widely used due to its clean and environmentally friendly characteristics. In terms of the operational control objective, the above-mentioned studies mainly focus on how to maximize the smooth grid-connected power of wind power without optimizing the energy loss generated by the energy storage system in the process of energy conversion This loss is only considered in modeling the energy storage system. By constructing a comprehensive objective function that considers the fluctuation of grid-connected power, the smoothness of the energy storage output and energy loss, a flexible grid-connected control strategy of wind power is proposed This strategy effectively improves the continuity of the power supply by using a hydrogen energy storage system in the timescale of intraday dispatching, and a model for evaluating the energy. Both the theoretical analysis and case study prove the effectiveness and superiority of the proposed system scheme, optimization model and energy consumption evaluation model
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