  In this paper, we propose networked microgrids to facilitate the integration
of variable renewable generation and improve the economics and resiliency of
electricity supply in microgrids. A new concept, probability of successful
islanding (PSI) is used to quantify the islanding capability of a microgrid
considering the uncertainty of renewable energy resources and load as well as
exchanged power at PCC. With the goal of minimizing the total operating cost
while preserving user specified PSI, a chance-constrained optimization problem
is formulated for the optimal scheduling of both individual microgrid and
networked microgrids. Numerical simulation results show significant saving in
electricity cost can be achieved by proposed networked microgrids without
compromising the resiliency. The impact of correlation coefficients among the
renewable generation and load of adjacent microgrids has been studied as well.
