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US4019124A
Expired / Lapsed
US
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Apparatus for compensating reactive power in a three-phase network
Assignee: Siemens AG
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Filing: 1976-03-11
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Granted: 1977-04-19
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Expires: 1996-03-11
Abstract
Abstract An apparatus for compensating for the reactive power in a three-phase network. The apparatus includes an uncontrolled rectifier, an intermediate DC link connected to the rectifier, and a self-commutating inverter connected to the DC link and controlled so as to have a pulse-width modulated output.
Inventors
- 👤 Gottfried Moltgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:00
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1842; Y; Y02; Y02E; Y02E40/00; Y02E40/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A cycloconverter apparatus for compensating for the reactive power in a three-phase network comprising: an uncontrolled converter adapted to be connected to said network for generating an impressed DC voltage; a self-commutating inverter for producing an output signal; inductance means for coupling said output signal to said network; an intermediate DC link for coupling said impressed voltage to said inverter; and means for controlling said inverter such that said output signal is a pulse width modulation signal having a pulse width angle which can be varied, said pulse width modulation signal comprising a fundamental frequency component which when coupled by said inductances is in phase opposition to the network voltage and which has an amplitude which varies with variations in said pulse width angle.
Claim 2
Dependent Claim
124 words
A cycloconverter apparatus for compensating for the reactive power in a three-phase network comprising: an uncontrolled converter adapted to be connected to said network for generating an impressed DC voltage; a self-commutating inverter for producing an output signal; inductance means for coupling said output signal to said network; an intermediate DC link for coupling said impressed voltage to said inverter; and means for controlling said inverter such that said output signal is a pulse width modulation signal having a pulse width angle which can be varied, said pulse width modulation signal comprising a fundamental frequency component which when coupled by said inductances is in phase opposition to the network voltage and which has an amplitude which varies with variations in said pulse width angle.
Claim 3
Dependent Claim
54 words
Apparatus in accordance with claim 1 in which: the pulse frequency of said pulse modulation signal is six times the frequency of said network voltage; and the voltage pulses of said pulse modulation signal have a fixed predetermined magnitude and are centered at distances of ±π/3 from the zero crossings of said fundamental component.
Claim 4
Dependent Claim
34 words
Apparatus in accordance with claim 2 in which said means for controlling includes: a controller responsive to the difference between a reactive power reference value and the actual reactive power value of said network.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |