Optimal Control Strategy for Peak Shaving in Power Systems with System Frequency Status and Hybrid Energy Storage Stations

In the context of dual carbon development, the integration of high proportions of renewable energy sources has intensified the peak-shaving pressure on the new power system. Energy storage technology, as a flexible regulating resource, offers significant advantages in mitigating the fluctuations of renewable energy and enhancing system stability. However, existing strategies for deploying energy storage in peak shaving often fail to fully realise the potential of hybrid storage systems in coordinating both peak shaving and frequency regulation. To address this issue, this study proposes an optimized dispatch strategy for hybrid energy storage systems that incorporates pumped storage and electrochemical storage. This strategy explicitly accounts for changes in system frequency during peak shaving operations, thereby achieving synergistic optimisation of peak shaving and frequency regulation. Finally, comparative analysis with scenarios lacking energy storage demonstrates that the proposed strategy not only significantly enhances the system's economic efficiency but also effectively maintains frequency stability under load disturbance conditions. This provides an effective pathway for strengthening both the economic efficiency and stability of power system operation.