  Renewable energy sources (RES) has gained significant interest in recent
years. However, due to favourable weather conditions, the RES is installed in
remote locations with limited transmission capacity. As a result, it can lead
to major curtailments of the free resource when the network is congested.
Therefore, energy storage system (ESS) is considered as a viable solution to
store energy and address the intermittent nature of RES though ESS is often
distributed and may not be geographically close to RES. Therefore, ESS may also
suffer from limited transmission capacity due to network congestion. Currently,
grid operators overlook network flexibility as a congestion management tool in
day-ahead scheduling. This paper addresses these issues and studies the
benefits of introducing network reconfiguration (NR) as a preventive and
corrective action for transmission flexibility in day-ahead stochastic
security-constrained unit-commitment (SSCUC-PC) while considering a
multi-scenario RES output. Simulation results demonstrate that NR can lower
total system cost, reduce RES curtailments and utilize ESS for better impact by
alleviating network congestion in both base-case and post-contingency networks.
