Robust PID-PSS Design for Stability Improvment of Grid-Tied HydroTurbine Generator

Dynamic stability is considered a vital issue in modern power systems. In this work, a robust design is proposed for the stability improvement of grid-connected hydro-turbine generators using the adaptive concept-based Electro-Search optimizer (ESO). In this regard, we provide a dynamic stability analysis of a hydro-turbine generator located at the Aswan High Dam, where proportional integral-derivative power system stabilizer (PID-PSS) is examined for a single machine connected to the Egyptian power system (EPS). The PID controller is developed in the synchronized EPS to significantly mitigate low-frequency oscillations due to various expected faults and undesirable operating conditions. Comprehensive simulation analysis is performed using Matlab/Simulink considering the synchronous machine rotor speed, mechanical and electrical output powers, field and terminal voltages. The operative performance of the introduced adaptive PID-PSS based ESO is assessed against the conventional system (i.e. without PSS) and system with standard PID-PSS under normal operating conditions where the effect of a 3-
$\varphi$
short-circuit fault is subjected at the grid bus. The findings prove that the proposed adaptive strategy can effectively maintain the dynamic stability of the main grid against fluctuations.