IEEE Power & Energy Magazine - May/June 2014 - 68

The concept behind the MPQSS is to simultaneously provide
power at multiple quality levels according to consumer needs.

What Is a Microgrid?
according to the CiGre working Group (wG) C6.22,
"microgrids comprise low voltage distribution systems with distributed energy sources, storage devices, and controllable loads,
operated connected to the main power network or islanded, in a
controlled, coordinated way." a microgrid may also be defined
as a self-contained subset of an area electric power system (ePs)
with access to indigenous distributed generation sources, distributed energy storage devices, end-user loads, control and protection switchgear, and distribution system assets. a microgrid
is equipped to function in parallel with the area ePs, appearing
to the rest of the grid as a single controllable entity as well as in
an intentionally islanded mode. Presently, a typical microgrid
can be found serving dedicated loads such as campus facilities,
remote communities, and military installations. the microgrid
concept offers a potential avenue to increase the penetration of
renewable energy-sourced generation in the grid, especially in
light of stunted investments in transmission systems in most

Bus

developed countries. microgrids possess several advantages,
such as the potential for higher power supply availability and
security for critical loads, investment deferrals in transmission and centralized generation plants, the provision of ancillary services to ePs, and opportunities for economic incentives
for customers. the microgrid concept is in alignment with the
smart grid vision of the u.s. Department of energy (Doe), the
smart Power infrastructure Demonstration for energy reliability and security (sPiDers) program of the u.s. Department
of Defense, and is a key component in the strategic research
agenda for europe's electricity networks of the Future. a conceptual architecture of a microgrid is shown in Figure 1, and
table 1 lists some of the microgrid installations in the world.

Microgrids in Disasters with
Electricity Service Disruptions
we present some examples of microgrids that were used
to increase electricity supply availability during disasters

Circuits

Open for
Facility Island

Substation
StepOpen for
Feeds
Down Tx Substation
Island

L

Open for
Substation Bus
Island
Open for
Circuit Island

L

L

N.C.

N.C.

N.C.
Open for
Lateral Island

N.O.
(Closed for
Adjacent
Feeder
Island)

Adjacent
Circuit

L

figure 1. A conceptual one-line diagram of a microgrid based on IEEE Standard 1547.4. (Source: C. Abbey.)
68

ieee power & energy magazine

may/june 2014



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2014

IEEE Power & Energy Magazine - May/June 2014 - Cover1
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IEEE Power & Energy Magazine - May/June 2014 - Cover3
IEEE Power & Energy Magazine - May/June 2014 - Cover4
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