Method and control for maintaining optimum performance of hvdc power transmission systems at rectifier end during ac system fault

Patent · Mon Dec 03 23:00:00 EST 1979

OSTI ID:5545955

Leete, B D

A new and improved control subassembly for hvdc power converters and method of its use during transient faults affecting the ac system employed in the hvdc power transmission system are discussed. The control assures the presence of adequate firing and commutating voltages across the respective hvdc thyristor valves during selected intervals of the alternating current periods of the respective phases. The hvdc power converters used in the system include gating circuits for gating-on respective ones of the thyristor valves during selected intervals of the alternating current periods of the respective phases. The gating circuits include equidistant-spaced gates firing pulse generating circuits for supplying equidistant-spaced gating-on firing pulses to the gate drives for the respective hvdc thyristor valves of the hvdc bridge power converter during normal operation of the converter in the presence of symetrically-shaped ac system voltage waveforms.

• Assignee: General Electric Co.
• Patent Number(s): US 4177507
• OSTI ID: 5545955
• Country of Publication: United States
• Language: English

Related Subjects

200302* -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
ALTERNATING CURRENT
CONTROL SYSTEMS
CURRENTS
DC SYSTEMS
DC TO DC CONVERTERS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL FAULTS
ELECTRONIC CIRCUITS
EQUIPMENT
GATING CIRCUITS
HVDC SYSTEMS
PERFORMANCE
POWER SYSTEMS