A Optimal Regulation Strategy for Grid-Connected System of Energy Storage Power Stations Considering Frequency-Voltage Security

To address the limitations of single-dimensional frequency or voltage control in energy storage grid-connected systems, which may result in a “trade-off” effect under disturbances or fluctuations in power grids with high penetration of renewable energy sources, this paper proposes a regulation strategy that integrates frequency-voltage coordinated security for energy storage grid-connected systems. The strategy accounts for the dynamic evolution of system frequency and voltage variations following disturbances, and establishes mathematical models that map frequency deviation and grid-connected node voltage deviation to power changes in energy storage stations. These models enable the prediction of frequency and voltage deviation trajectories during control. A multi-objective optimal control model is further developed to balance coordinated frequencyvoltage security with economic efficiency, thereby ensuring secure and coordinated operation of grid-connected energy storage systems under grid disturbances.