Frequency Stability in Renewable-Rich Power Systems with High Solar Ramps

The rapid integration of renewable energy sources into power systems is outpacing the implementation of solutions to address the stability challenges they pose. This study focuses on the impact of rapid ramp-down incidences of solar power plants on the stability of isolated power systems with high non-conventional renewable energy penetration and minimal support from thermal plants. Key issues include the intermittency of renewables, reduction of system inertia, and unpredicted ramp events. By using a simulated scenario based on the IEEE 14 bus system, comprising hydro and solar generation plants, this research identifies the maximum ramp-down rate and duration that the system can withstand without compromising stability. Hydro power plants, with their flexible and quick response capabilities, are critical for frequency control and system stabilization. Solar power plants, representing the most widely used non-conventional renewable source, add variability to the system.