Implementering av en PSS i Trängslets kraftstation
The purpose of this master thesis is to implement and validate a Power System Stabilizer (PSS) to a generator at Trängslet hydropower station in Dalarna, Sweden. Problems with local rotor oscillations can occur at the hydropower station when power is transferred on a new power line (130 kV) from Northern to Southern part of Dalarna. To ensure good operation properties on this power line Fortum Generation AB and Fortum Distribution AB wants to activate a PSS on a generator.There have been investigations in which situations and what equipment that contributes to rotor oscillations. When this is known the PSS is tuned to damp these oscillations by choosing a good set of parameters. The most important parameters for good performance are to choose amount of gain and phase compensation. The chosen set of parameters are verified with a test in the power station to ensure that the task is completed.Test results shows that the magnitude of the first swing in rotor oscillation is almost the double than what PSS/E shows, but good correlation five seconds after initialization of the disturbance. The inherent dampening performance of the generator is much better in reality than in simulation. The chosen set of parameters contributes to rotor oscillation dampening in a magnitude approximately equal to simulation results in PSS/E, why the conclusion has been made that the implementation of the PSS is successful. There has also been made simulations with different power outputs and amount of generators synchronized whose results shows that damping is greatly increased with the chosen PSS.