This
paper presents the optimal scheduling of renewable resources using interior
point optimization for grid-connected and islanded microgrids (MG) that operate
with no energy storage systems. The German Jordanian University (GJU) microgrid
system is used for illustration. We present analyses for islanded and
grid-connected MG with no storage. The results show a feasible islanded MG with
a substantial operational cost reduction. We obtain an average of $1k daily
cost savings when operating an islanded compared to a grid-connected MG with
capped grid energy prices. This cost saving is 10 times higher when considering
varying grid energy prices during the day. Although the PV power is
intermittent during the day, the MG continues to operate with a voltage
variation that does not 10%. The results imply that MGs of GJU similar topology
can optimally and safely operate with no energy storage requirements but
considerable renewable generation capacity.
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