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US5051684A
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Three-phase voltage stiff convertor
Assignee: ABB AB
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Filing: 1991-01-07
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Granted: 1991-09-24
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Expires: 2011-01-07
Abstract
Abstract A three-phase voltage stiff converter (SR) has two six-pulse converters (SR1, SR2). The alternating voltage terminals of the partial converters are connected to a transformer (TR) with the aid of which the resultant alternating voltage of the converter is formed as the difference between the alternating voltages of the partial converters. Each partial converter has a separate direct voltage source (C1, C2). The converter has control members (SD) which control the two partial converters with a mutual phase displacement alternating between +150 DEG and -150 DEG .
Inventors
- 👤 Lennart Angquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:11
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1842; H02J3/1857; Y; Y02; Y02E; Y02E40/00; Y02E40/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
138 words
A three-phase voltage stiff convertor comprising a first and a second six-pulse convertor, each partial convertor having alternating voltage terminals and direct voltage terminals in which the partial convertors operate phase-displaced in relation to each other, the alternating voltage terminals of the partial convertors are connected to a transformer for forming the alternating voltages of the convertor by combination of the alternating voltages of the partial convertors, and the direct voltage terminals of each partial convertor are connected to a direct voltage source wherein the convertor has two separate direct voltage sources, each one connected to the direct voltage terminals of one of the partial convertors, and wherein the convertor is provided with control members adapted to control the partial converters such that the phase displacement between the two partial convertors constantly alternates between positive and negative values.
Claim 2
Dependent Claim
138 words
A three-phase voltage stiff convertor comprising a first and a second six-pulse convertor, each partial convertor having alternating voltage terminals and direct voltage terminals in which the partial convertors operate phase-displaced in relation to each other, the alternating voltage terminals of the partial convertors are connected to a transformer for forming the alternating voltages of the convertor by combination of the alternating voltages of the partial convertors, and the direct voltage terminals of each partial convertor are connected to a direct voltage source wherein the convertor has two separate direct voltage sources, each one connected to the direct voltage terminals of one of the partial convertors, and wherein the convertor is provided with control members adapted to control the partial converters such that the phase displacement between the two partial convertors constantly alternates between positive and negative values.
Claim 3
Dependent Claim
30 words
A convertor according to claim 1, wherein the control members are adapted to control the partial convertors such that the means value of the phase displacement between them is zero.
Claim 4
Dependent Claim
35 words
A convertor according to claim 1, wherein the control members are adapted to control the partial convertors such that the phase displacement between them alternates between a positive value of an equally great negative value.
Claim 5
Dependent Claim
44 words
A convertor according to claim 1, wherein the partial convertors are six-pulse convertors and wherein the control members are adapted to control the partial convertors such that the phase displacement between them alternates between two values which are substantially equal to +150° and -150°.
Claim 6
Dependent Claim
30 words
A convertor according to claim 1, wherein the control members are adapted to control the partial convertors such that the phase displacement between them periodically alternates between said two values.
Claim 7
Dependent Claim
49 words
A convertor according to claim 5, wherein the control members are adapted to control the partial convertors such that the phase displacement between them changes sign each time the control vector in one of the partial convertors is the inverse of the control vector in the other partial convertor.
Claim 8
Dependent Claim
28 words
A convertor according to claim 6, wherein the control members comprise members for suppressing occasional sign reversals for achieving a change of the operating mode of the system.
Claim 9
Dependent Claim
31 words
A convertor according to claim 7, wherein the control members comprise members for suppressing occasional sign reversals with a frequency which is lower than the commutating frequency of each partial convertor.
Claim 10
Dependent Claim
34 words
A convertor according to claim 1 for connection to an alternating voltage network and for delivering a positive or negative reactive power to the network, wherein the direct voltage sources consist of capacitor banks.
Claim 11
Dependent Claim
45 words
A convertor according to claim 9, wherein it is provided with members for control the capacitor voltages in dependence on the flux of reactive power between the convertor and the network by influencing the phase position of the partial convertors relative to the line voltage.
Claim 12
Dependent Claim
55 words
A convertor according to claim 1, wherein the transformer has an open convertor winding with three-phase windings, each phase winding having one of its end points connected to an alternating voltage terminal of one of the partial convertors and its other end point connected to the corresponding alternating voltage terminal of the other partial convertor.
Claim 13
Dependent Claim
21 words
A convertor according to claim 11, wherein the transformer has a star-connected network winding with a terminal for grounding the winding.
Claim 14
Dependent Claim
35 words
A convertor according to claim 2 wherein the control members are adapted to control the partial convertors such that the phase displacement between them alternates between a positive value and an equally great negative value.
Claim 15
Dependent Claim
44 words
A convertor according to claim 3 wherein the partial convertors are six-pulse convertors and wherein the control members are adapted to control the partial convertors such that the phase displacement between them alternates between two values which are substantially equal to +150° and -150°.
Claim 16
Dependent Claim
30 words
A convertor according to claim 4, wherein the control members are adapted to control the partial convertors such that the phase displacement between them periodically alternates between said two values.
Claim 17
Dependent Claim
34 words
A convertor according to claim 8, for connection to an alternating voltage network and for delivering a positive or negative reactive power to the network, wherein the direct voltage sources consist of capacitor banks.
Claim 18
Dependent Claim
55 words
A convertor according to claim 10, wherein the transformer has an open convertor winding with three-phase windings, each phase winding having one of its end points connected to an alternating voltage terminal of one of the partial convertors and its other end point connected to the corresponding alternating voltage terminal of the other partial convertor.
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) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |