  This paper proposes a disturbance-observer-based control (DOBC) scheme for
frequency and voltage regulation for a renewable energy sources (RES)
integrated power systems. The proposed approach acts a feed-forward control
which improves the dynamic performance of the conventional
proportional-integral-derivative (PID) controller. Robustness of the proposed
control scheme has been validated through simulations under worst-case and
stochastic uncertainties to mitigate real-time variability in RES output and
load. The performance of the proposed control technique is compared to well
established technique in presence of communication delay and white noise.
