Patent US3829759A successfully refreshed from Google Patents.
US3829759A
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Means for generating reactive power
Assignee: ABB Norden Holding AB
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Filing: 1973-01-18
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Granted: 1974-08-13
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Expires: 1993-01-18
Abstract
Abstract An arrangement for generating reactive power includes first and second line-commutated converters, the AC terminals of which are connected to an alternating voltage network to which a capacitor bank is also connected. Two branchless connections connect the converters in anti-parallel relation on the DC side and constitute an unloaded DC intermediate line, each DC terminal of each converter being connected by a branchless reactor connection to a DC terminal of the other converter.
Inventors
- 👤 K Thorborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1842; H02J3/185; Y; Y02; Y02E; Y02E40/00; Y02E40/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
Means for generating reactive power, which comprises a first and a second line-commutated converter, each with AC terminals for connection to an alternating voltage network, a capacitor bank for connection to said network, two branchless reactor connections anti-parallel connecting the converters on the DC side and constituting an unloaded DC intermediate line, each DC terminal of each converter being connected by a branchless reactor connection to a DC terminal of the other converter.
Claim 2
Dependent Claim
73 words
Means for generating reactive power, which comprises a first and a second line-commutated converter, each with AC terminals for connection to an alternating voltage network, a capacitor bank for connection to said network, two branchless reactor connections anti-parallel connecting the converters on the DC side and constituting an unloaded DC intermediate line, each DC terminal of each converter being connected by a branchless reactor connection to a DC terminal of the other converter.
Claim 3
Dependent Claim
65 words
Means according to claim 1, which comprises control pulse devices arranged to emit firing pulses to the rectifiers in the two converters in such a way that each rectifier in the second converter is fired with a certain delay in relation to the firing of the corresponding rectifier in the first converter, said delay being substantially equal for all the rectifiers of the second converter.
Claim 4
Dependent Claim
52 words
Means according to claim 2, in which sensing members are arranged to sense a magnitude corresponding to the total reactive power generated by both converters and to influence said control pulse devices to influence the firing times of the rectifiers in accordance with the deviation of said power from a desireD value.
Claim 5
Dependent Claim
13 words
Means according to claim 2, in which said delay has a contant value.
Claim 6
Dependent Claim
22 words
Means according to claim 4, in which the delay has a value corresponding to an electric angle of between 20* and 40*.
Claim 7
Dependent Claim
11 words
Means according to claim 2, in which said delay is variable.
Claim 8
Dependent Claim
53 words
Means according to claim 2, in which the sensing members are voltage sensing members including means to sense the voltage at a point in the AC network and to influence said control devices to affect the firing times of the rectifiers, in dependence upon the deviation between said voltage and a desired value.
Claim 9
Dependent Claim
39 words
Means according to claim 2, in which said control pulse devices include means to control the rectifiers of a converter so that each group of rectifiers connected to the same phase-conductor is fired with substantially the same control angle.
Claim 10
Dependent Claim
46 words
Means according to claim 8, in which said sensing members are voltage sensitive members for sensing the asymmetry in the alternating voltage at a point in the alternating voltage network and, dependent on the magnitude of the asymmetry, to influence the control angles for said groups.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |