Frequency Stability of Power Electronic Based Power System with 100% Renewable Energy.

Sammanfattning: The modern power system is aiming to progress away from conventional synchronous machine  based power generation towards converter dominated system that leads to extensively high penetration of renewable energy such as wind and PV. This transition of modern power system toward converter based renewable energy comes with new challenges as the conventional synchronous generation is being replaced by converter based power system (CBPS). The converter is commonly interfaced to the power system with Phase Locked Loop (PLL) technique to synchronize the converter with the grid voltage angle and inject the current at the right angle. Therefore, this approach is called grid- ­following converter; this type of configuration of converters may lead to some power system instabilities (e.g., voltage instability, frequency instability, synchronous and sub­synchronous instabilities). In order to overcome the limitation of the grid-­following converters, another converter control concept become present in the literature as a grid-­forming converter where the synchronizing method to the grid eliminates the need for PLL .In this thesis, a grid- ­forming controlled power converter is implemented with an energy storage system to emulate the inertia of the synchronous generator through the VSM control concept. An electromagnetic transient (EMT) simulation has been modeled in the PSCAD simulation environment. The model is the well­known four-­machine two-­area power system. The model has been tested by incrementally replacing the synchronous machines with wind farms connected through power converters; this weakens the grid and may lead to frequency instability during a disturbing event. An Energy Storage System (ESS) has been implemented and added to the system to mitigate the loss of the kinetic energy of the rotating masses of the synchronous generators. The ESS is integrated with a grid-­forming converter that is controlled to mimic the dynamic behavior of a synchronous generator. Thus, the ESS is synchronized to the system based on the swing equation of the synchronous generator. The results show significant improvements in the frequency stability of the system under study.