The invention discloses a micro-
grid system of a grid-connected island
power grid. The
system comprises an
energy storage system, a power distribution network load
system, a diesel power generating system, a
wind driven generator system, an
optical fiber communication network, and a micro-grid energy coordinated optimization and
control system. The
energy storage system accesses an AC
bus of an island
power grid through a boosting
transformer. The power distribution network load system makes user load ends connected with a power distribution network load
transformer through fast
solid-state switches. The diesel power generating system is used as a main power supply when the micro-
grid system is in isolated island operation. The
wind driven generator system comprises an asynchronous wind generating set. The
stator output sides of the asynchronous wind generating set are connected in series with back-to-back
converters. The output of the back-to-back
converters is transmitted to the AC
bus of the island
power grid through boosting. In the island power grid, optical fibers are set up along a
power transmission and distribution line, and
optical fiber communication
transmitter-
receiver devices are installed on power supply points, load points, and control terminals, so as to form the
optical fiber communication network of the island power grid. The micro-grid energy coordinated optimization and
control system collects island power grid operation data in real time through the optical
fiber communication network, and releases control instructions.