IEEE Power & Energy Magazine - May/June 2015 - 93
in my view (continued from p. 96)
of microgrids as well as distributed and
renewable generation devices, and the
enhancement by distribution automation. In my view, the following areas are
essential for the resiliency of the future
distribution systems.
New Concepts and
Analytical Tools
for Resiliency
A standardized definition of resiliency
is needed to develop the requirements
and procedures for distribution system
planning and operation. In the transmission area, the N-1 (or N-2) security
criterion is widely adopted by industry
worldwide. A power system is said to be
secure if the system is able to maintain
normal operating conditions following a
single contingency such as a line or generator outage. A similar concept can be
may/june 2015
Resiliency of
a distribution
system is
defined with
respect to
a system's
ability to
withstand rare
and extreme
events.
adopted for distribution
systems, i.e., a distribution system is considered
to be resilient if it is able
to maintain service to
critical load following
an extreme event such
as a severe hurricane or
earthquake.
The availability (e.g.,
either available or damaged/unavailable) of various distribution system
components needs to be
assessed during and after
the extreme event. Modeling and simulation tools
are needed to evaluate the
system's capability to maintain critical
loads with the available generation, transmission, and distribution facilities. For
planning purposes, these
tools provide important
information for enhancing
the redundancy and connectivity of the distribution systems. For system
operation, the tools can
be used to determine the
emergency actions that
need to be taken to restore
critical loads and services.
Microgrids
and Distributed
Energy
Resources
Microgrids can be operated in a utility-connected
mode with the neighboring distribution system or in an islanded mode
in separation with the distribution
ieee power & energy magazine
93
Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2015
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IEEE Power & Energy Magazine - May/June 2015 - Cover3
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