Static reactive power compensator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 16, 1993
Grant Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Nov 27, 1991
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for compensating a polyphase electrical power supply for reactive power loads on an AC supply line is disclosed. The static VAR compensator disclosed herein can provide a selectable, constant amount of VARs to compensate for reactive loads on the line, or alternately provide a fixed phase angle. The static VAR compensator may be controlled to compensate for fluctuating reactive loads. The static VAR compensator includes a transistorized inverter, connected between the AC supply and a constant voltage, that has switches to control the instantaneous current on each phase line of the AC power supply. By modulating the inverter switches at a high frequency, the instantaneous currents flowing through each of the phase lines can be modulated for precise control of the real and the reactive power. A voltage waveform is obtained from each phase of the utility grid, and used as a reference waveform. The control system applies the reference waveform to create two waveforms: a real waveform and an imaginary waveform for each phase. The imaginary waveform is multiplied by a VAR multiplier M.sub.1 to supply the desired number of VARs, the real waveform is multiplied by a real multiplier M.sub.2 that is derived to control the constant voltage source, and resultant waveforms are added together to provide a current control waveform for each phase that is applied to the inverter through a current regulator and drive circuits.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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GENERAL ELECTRIC COMPANY | 1 NEUMANN WAY EVENDALE OH 45215 |
International Classification(s)

- 1991 Application Filing Year
- G05F Class
- 163 Applications Filed
- 88 Patents Issued To-Date
- 53.99 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Erdman, William L | Brentwood, CA | 25 | 1777 |
# of filed Patents : 25 Total Citations : 1777 |
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Patent Citation Ranking
- 60 Citation Count
- G05F Class
- 98.31 % this patent is cited more than
- 32 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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