  Extreme circumstances in which a local distribution system is electrically
isolated from the main power supply may not always be avoidable. Efforts must
be made to keep the lights on for such an isolated distribution system (IDS)
until reconnection to the main power source. In this paper, we propose a
strategy to enhance IDS survivability utilizing the coordination of two
flexible approaches, namely, separable energy storage systems (SMESSs), which
construct non-wires links for energy transmission between the IDS and the
external live power sources, and demand response (DR), which adjusts the
internal electrical demand of the IDS to provide effective operating stress
alleviation. Considering the uncertainty of renewable energy generation and
loads, a two-stage robust optimization (RO) model involving the joint
scheduling of these two approaches is constructed. The objective is to minimize
the fuel consumption and the decreased and nonserved demand under the
worst-case scenario to endow the IDS with extended survivability. Finally, test
is conducted and the results demonstrate the effectiveness of the proposed
method in enhancing the survivability of IDS.
