Primary Frequency Control
One of the primary tasks in power system operation is monitoring and controlling frequency, where the primary frequency control capability of grid-connected power sources plays a crucial role in maintaining grid frequency stability. With the increasing penetration of renewable energy sources such as wind power and photovoltaic (PV) generation in power systems, the proportion of conventional synchronous generators has gradually decreased. This has led to significant reductions in system rotational inertia and frequency regulation capabilities, thereby weakening the grid's primary frequency control capacity. When a region contains numerous renewable energy plants and their grid-connected capacity reaches a certain proportion, it often induces active power-frequency oscillations in the local area or even the entire grid, potentially leading to frequency instability.