A real time integrated modelling and control of modified pumped storage governor-PSS damping action for random renewable penetration

Abstract

The modern power system network is continuously being penetrated by asynchronous intermittent renewable generations like solar and wind sources. Also, hydro plants can be an integral part for future power generation along with pumped storage units, but their governors need to be modified to provide adequate damping torque. So, to meet these challenges a coordinated strategic control of a new two degree of freedom pumped storage hydro governor with power system stabilizer has been proposed here to damp rotor angle oscillations in power system. The modified governor can provide good regulation along with tracking of error signal and power system stabilizer is modified to provide fast response along with reduced transient and steady state error. The proposed control action is optimally coordinated by a modified differential evolution with gray wolf optimizer algorithm. A two area four machine and 39 bus modified New England hydro dominated system have been taken in this work. Proposed controller's performance has been justified by different critical oscillatory conditions as random solar and wind penetrations with time and frequency analysis. These experimentations have been conducted in MATLAB Simulink and verified with real time simulation based in OPAL-RT 4510. For optimal coordination a multi objective function has been considered here including minimization of speed and real power deviation, undershoot and overshoot with settling time. This control action is simple, easy to implement, less costly and much efficient to damp oscillations and will enhance usability of existing hydro resources.