IEEE Power & Energy Magazine - May/June 2017 - 64

By Guillermo Jiménez-Estévez,
Alejandro Navarro-Espinosa,
Rodrigo Palma-Behnke,
Luigi Lanuzza, and Nicolás Velázquez

I

INCREASING POWER SYSTEM RESILIENCE AT THE DISTRIBUTION
level is crucial due to the negative social impact of blackouts, as the undesired
consequences get worse the longer the system restoration takes. Statistical records
demonstrate that system recovery times after high-impact, low- probability events
(e.g., earthquakes, tsunamis, and floods) are often faster for generation and transmission segments than for the distribution system. During the 2010 Chilean earthquake (8.8 Mw on the Richter scale), for example, the distribution system in the
most affected area (almost 1.1 million customers) was not totally back in service
until two weeks after the first major seismic event. In contrast, the transmission
system rapidly recovered, with most of the bulk system buses re-energized by the
end of the first day and the remainder during the second day. Additional installed
generation capacity and repairing minor damage to most of the affected generation plants allowed for the recovery of most of the supply within a few days. Only
6.1% of the installed generation capacity required major repairs (which took up to
six months to complete).
Unfortunately, in Chile, high-impact, low-probability power system events
present a latent risk of human catastrophe, particularly in disadvantaged communities. System resilience is essential. In this context, microgrids, which are subsets
of distribution systems (e.g., equipped smart technologies), offer the capability to
maintain energy supplies under emergency conditions, serving critical infrastructure like hospitals, street lighting, communication antennas, and other assets.

Achieving
Resilience at the
Distribution Level
Digital Object Identifier 10.1109/MPE.2017.2662328
Date of publication: 19 April 2017

64

ieee power & energy magazine

1540-7977/17©2017IEEE

may/june 2017



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IEEE Power & Energy Magazine - May/June 2017 - Cover3
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