Self commutated power converter for stabilizing torsional interactions

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5397740

Anwah, N A

In the Western United States, where large coal power plants may be separated from the load centers by several hundred miles, series compensation of transmission lines with capacitors is often used to increase the amount of power than can be transmitted over the long transmission lines. However, series compensation has been known to cause unstable interactions between the transmission system and the torsional modes of steam turbogenerators. This type of unstable interaction falls into the general category of subsynchronous resonance (SSR). In this research, a new method of counteracting SSR, referred to as transmission current feedback, is investigated. This method involves the measurement of the transmission system current from which the subsynchronous components that produced torsional interations are extracted, using reference frame theory. Once extracted, these currents are suitably amplified by a power converter and injected into the generator bus of the affected steam turbine so as to cancel the original subsynchronous components that should otherwise produce torsional interactions. A practical realization of a multimegawatt power converter, with a response bandwidth that includes the complete range of subsynchronous frequencies, is set forth.

• Research Organization: Purdue Univ., Lafayette, IN (USA)
• OSTI ID: 5397740
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AMPLIFICATION
CONTROL EQUIPMENT
CURRENTS
DISTANCE
ELECTRIC CURRENTS
ENERGY LOSSES
EQUIPMENT
FEEDBACK
LINE LOSSES
LOSSES
POWER LOSSES
POWER TRANSMISSION
SYNCHRONIZATION