In view of the frequency fluctuation of the new power system caused by large-scale new energy grid connection, a secondary frequency modulation control strategy for grid-side energy storage devices is proposed, which takes the grid frequency modulation demand and. In view of the frequency fluctuation of the new power system caused by large-scale new energy grid connection, a secondary frequency modulation control strategy for grid-side energy storage devices is proposed, which takes the grid frequency modulation demand and. To help keep the grid running stable, a primary frequency modulation control model involving multiple types of power electronic power sources is constructed. A frequency response model for power systems is proposed to address the poor accuracy in inertia assessment, and its frequency. This paper aims to meet the challenges of large-scale access to renewable energy and increasingly complex power grid structure, and deeply discusses the application value of energy storage configuration optimization scheme in power grid frequency modulation. Based on the equivalent full cycle model. Secondary frequency modulation control strategy for large-scale grid-side energy storage devices in new power systems 1. School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2. This article explores how BESS technology stabilizes grid operations, integrates renewable energy, and delivers cost-effective solutions for utilities and industrial users. The depth limit of energy storage action is proposed, which clarifies the dead zone and the maximum output.