Synchronous Generator Active and Reactive Power Oscilations Reduction by BESS

In the presented paper, we address the threats arising from the negative transient effects in the electrical grid and we propose ways how to decrease their negative effect on the synchronous generator. The proposed solution uses BESS installed in the common electrical node with the synchronous generator. The main thread arising from these transients is a continuous decrease of the turbomachinery service life, by decreasing the health of the winding insulation or by the mechanical oscillations excited by the transients, which damage the turbine. The analysis and the proposed control algorithm for the BESS have been verified by the simulation model in Simulink (MATLAB) environment. In the Simulink model, we assumed that the turbomachinery is connected to a steam turbine. As a case study, a real measured grid voltage transient has been chosen. This transient consists of a sudden drop in grid voltage magnitude. The model includes proposed control loops for the battery energy storage system and the generator itself. These are key parts affecting the stability and performance of the proposed control and it is discussed in the conclusion.