  The control schemes of distributed energy resources (DERs) in active
distribution networks (ADNs) are largely influenced by uncertainties. The
uncertainties of DERs are complicated, containing spatial and temporal
correlation, which makes it challenging to design proper control schemes,
especially when there exist temporal-correlated units such as energy units
(EUs). This paper provides an Ito process model to describe the characteristics
of stochastic resources and EUs in a unified way, which makes it easy to
evaluate the impacts of stochastic resources on temporal-correlated units.
Based the moment form of the Ito process model, a moment optimization (MO)
approach is provided to transform the stochastic control (SC) problem into an
optimization problem with respect to the first-order and second-order moments
of the system variables. The scale of MO is comparable to that of the
corresponding deterministic control problem, which means that the computational
efficiency of MO is much smaller than that of traditional approaches. Case
studies also show that the proposed approach outperforms existing approaches in
both the performance and computational efficiency, which means that the
proposed approach has attractive potential for use in large-scale applications.
