Improvement of Inter-Area Oscillation damping By coordination of multiple PSSs and Statcom

The stability of an electrical grid is compromised by unbalance between production and load; therefore, across the engineering literature, stability is an important concern in interconnected power systems. The present work seeks to remedy the phenomenon of instability of a power system linked to a Static Synchronous Compensator (Statcom) by introducing power system stabilizers (PSSs). The typical two-area, four-machine, and eleven-bus system is submitted to a three-phase fault without any control. A Statcom intruduces separately at the center of the line and at the access of the two areas of the studied system, and power system stabilizers are connected to the exciter with different inputs (conventional PSS with electrical power input ; conventional PSS with generator speed input ; multi-band PSS (MB_PSS)), offering the possibility of returning to the permanent regime for a short period. Matlab/Simulink simulation permits us to plot the inter-area transfer rotor speed and survey the permanent divergence of the oscillatory regime. Results are compared in order to detect the best solution to achieve transient stability.

Comparing the results of our simulation, we concluded that installing a delta w PSS with Statcom at the center of the line in the two-area power system provides the best solution to avoid the problem of instability in electrical grids.