IEEE Power & Energy Magazine - May/June 2014 - 82

This article presents an automatic RASA system
within BC Hydro's fully integrated energy management
and RAS system.

transient stability as well as voltage stability and in mitigating thermal overloading. TsaPM and rasa applications are
responsible for determining the rasa patterns and downloading the recommended patterns to ras schemes at arming
stations. The eMs applications and ras schemes at arming
stations are fully integrated, forming an automatic ras system as shown in figure 7.
Using state estimator results as input, TsaPM runs periodically to provide rasa patterns in real time; the process relies
heavily on the fact that the database contains a large number
of cases and rules generated from off-line planning studies

of power system security. a pattern-matching technique is
employed to match the real-time condition as calculated by
the state estimator with the closest case in the database. a set
of rules associated with the predefined real-time condition is
selected to determine precontingency restrictions (preventive
actions) and rasa patterns (corrective actions).
a rasa pattern can be established in an automatic way
(using TsaPM) or manually, and the arming pattern can
be downloaded automatically or manually. running in the
normal mode-as a scada/eMs function-the rasa
application receives the rasa patterns recommended

figure 8. A list of alarms triggering auto download suspension.
82

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
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