Application of integrated energy storage system in wind power fluctuation mitigation

This paper mainly studies the application of integrated energy storage systems in wind power fluctuation mitigation. Firstly, the relationship between the energy storage SOC and the cut-off frequency is obtained based on the high pass filtering algorithm. Then the impacts of energy storage capacity, energy storage initial SOC and cut-off frequency on wind power fluctuation mitigation are analyzed. In addition, an adaptive high pass filtering algorithm is established, where the initial filtering time constant and filtering time constant step can be determined. So wind power fluctuation can be effectively mitigated to meet the grid-connected requirements. Furthermore, a coordinated control strategy for an integrated energy storage system is proposed, where energy storage system is divided into multiple groups of energy storage with different charge and discharge characteristics to achieve the economical operation of the system. Finally, the case study is provided to analyze the effectiveness of the proposed strategies, which can provide a theoretical reference for the promotion of integrated energy storage systems in renewable energy generation.