Topic: Real Consequences Follow Imaginary Power Deficiencies

Lecturer: Prof. Charles Henville, IEEE Fellow

Time: Nov. 5th 11:00-11:30

Site : 3-102, West Main Building

About the Author :

Charles Henville graduated from the University of Cambridge in England in 1969. He has also received a Master of Engineering degree from the University of British Columbia in 2000.

His passion for protective relaying started in 1977 and continues to this day. After a thirty year career with BC Hydro, he retired in 2005 from the position of principal engineer.

He is a Fellow of IEEE, and is also past Chair of the IEEE PES Power System Relaying Committee.

Abstract:

Ninety percent of major electric power system disturbances in recent years include some aspect of voltage collapse. This seminar will highlight the importance of reactive power in supporting system voltage. It will review the relationship of voltage support to angular or dynamic stability, and the impact of low reactive reserves in precipitating or aggravating major disturbances. The seminar will then discuss the specific problems that arose in five major disturbances, one in Quebec 1989, two in the WECC in 1996, the NE USA and Canada blackout in 2003 and the South Sweden blackout in 2003. We will also present a rare demonstration of an actual voltage collapse demonstrating a classic PV curve. This information was captured from a relay event record during a disturbance in Peru in October 2001. Finally there will be discussion of the increasing importance of undervoltage load shedding schemes and the benefits of providing additional supervision by wide area measurements and reactive power measurements.