Voltage stability and security assessment for power systems

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5962583

Costi, A G

Voltage collapse and abnormally high and low voltages have been observed, with even greater frequency and severity on large interconnected systems. Recurrent problems exist in Europe, Japan, Southern California, Florida, Pennsylvania Jersey Maryland, New York Power Pool, and Ontario Hydro. These voltage problems are associated with the insufficient local reactive reserves, the transfer of power across long geographical distances, and the ever increasing loading of the long transmission lines of these interconnected systems. For study of the voltage problems, a sensitivity model was developed based on the linearized decoupled load flow model. A method for determining the voltage control areas (VCA) and the weak transmission boundaries was developed. Computational results reveal that voltage collapse problems in a VCA are associated with the inability of transferring large amounts of reactive power across the weak transmission boundary, and that excessive reactive capacitive support in a VCA causes reactive flows from the VCA to the rest of the system, worsening a voltage problem rather than improving it. Real and reactive load increase at a bus in a VCA was found to affect the voltages at all buses in the VCA.

• Research Organization: Michigan State Univ., East Lansing (USA)
• OSTI ID: 5962583
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
29 ENERGY PLANNING, POLICY, AND ECONOMY
296002 -- Energy Planning & Policy-- Electric Power Transmission & Distribution-- (-1989)
CAPACITY
ENERGY SYSTEMS
INTERCONNECTED POWER SYSTEMS
POWER SYSTEMS
POWER TRANSMISSION LINES
SENSITIVITY ANALYSIS
STABILIZATION
VOLTAGE DROP