Transmission line voltage detector for static var generator
Patent
·
OSTI ID:5943414
A controlled static VAR generator is described including static power switches controlled for coupling a reactive power source onto AC transmission lines for power factor compensation thereof and detection means responsive to the AC transmission line voltage for providing a control signal representative of the amplitude of the line voltage, the control signal being applied to the static power switches; the detection means comprising: means responsive to the AC transmission line voltage for deriving a time related signal V(t) representative thereof and of fundamental frequency ..omega..=2..pi..f; means synchronized with the AC transmission line voltage for providing a first signal representative of cos (..omega..t) and a second signal representative of sin (..omega..t); first multiplier means for providing with the time related signal V(t) and the cos (..omega..t) representative signal a signal representative of a first product V(t)Xcos (..omega..t); second multiplier means for providing with the time related signal V(t) and the sin (..omega..t) representative signal a signal representative of a second product V(t)Xsin (..omega..t); first means for integrating through the fundamental period T the first product representative signal to derive the Fourier coefficient; second means for integrating through the fundamental period T the second product representative signal to derive the Fourier coefficient; and means responsive to the first and second integrating means for deriving the control signal as a voltage amplitude representative signal V.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4811236
- OSTI ID:
- 5943414
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200301* -- Power Transmission & Distribution-- AC Systems
EHV & UHV-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
CALCULATION METHODS
CONTROL SYSTEMS
ELECTRIC GENERATORS
ELECTRONIC CIRCUITS
ELECTROSTATICS
ENERGY SYSTEMS
POWER CONDITIONING CIRCUITS
POWER SYSTEMS
POWER TRANSMISSION
POWER TRANSMISSION LINES
VAR CONTROL SYSTEMS
VOLTAGE REGULATORS
EHV & UHV-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
CALCULATION METHODS
CONTROL SYSTEMS
ELECTRIC GENERATORS
ELECTRONIC CIRCUITS
ELECTROSTATICS
ENERGY SYSTEMS
POWER CONDITIONING CIRCUITS
POWER SYSTEMS
POWER TRANSMISSION
POWER TRANSMISSION LINES
VAR CONTROL SYSTEMS
VOLTAGE REGULATORS