Abstract
The integration of a significant amount of renewable energy into the power system brings uncertainties in terms of source-side output and the balance between source and load supply and demand. This increase in uncertainty, following system disturbances, poses challenges for frequency regulation and stable operation. This paper presents a primary frequency control strategy with energy storage assistance. It employs a combination of droop control and virtual inertia control to effectively modulate the frequency. The strategy utilizes energy storage system monitoring of the power grid’s operating state. In cases of significant disturbances, it employs a combination of droop control and virtual inertia control to mitigate frequency decline and assist in the recovery of system frequency. For minor disturbances, it directly utilizes droop control to maintain system frequency stability. Simulation experiments were conducted on the enhanced IEEE 9-bus system model using Matlab/Simulink. The results demonstrate that the proposed algorithm maintains system frequency stability under different circumstances.
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