  In this paper, the impact of stochastic load and renewable generation
uncertainty on the dynamic voltage stability margin is studied. Stochastic
trajectories describing the uncertainty of load, wind and solar generation have
been incorporated in the power system model as a set of Stochastic
Differential-Algebraic Equations (SDAEs). A systematic study of Monte Carlo
dynamic simulations on the IEEE 39-Bus system has been conducted to compute the
stochastic load margin with all dynamic components active. Numerical results
show that the uncertainty of both demand and generation may lead to a decrease
on the size of the dynamic voltage stability margin, yet the variability of
renewable generators may play a more significant role. Given that the
integration of renewable energy will continue growing, it is of paramount
importance to apply stochastic and dynamic approaches in the voltage stability
study.
