A Power System Stabilizer (PSS) is a device used in electrical power systems to enhance the stability of generators. It works by adding damping to the oscillations that can occur in the system, which helps maintain a steady output of electricity. This is crucial for preventing disturbances that can lead to power outages or equipment damage. PSS typically monitors the electrical signals from the generator and adjusts the excitation system accordingly. By doing so, it helps to stabilize the system during fluctuations in load or generation, ensuring that the power supply remains reliable. This technology is essential for maintaining the efficiency of large-scale power systems, such as those involving renewable energy sources or interconnected grids.