US3821629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converter station with parallel static converters
Assignee: ABB Norden Holding AB
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Filing: 1973-06-21
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Granted: 1974-06-28
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Expires: 1993-06-21
Abstract
Abstract A converter station is composed of two parallel static converters each provided with a control system including a current regulator which is adjusted in accordance with a predetermined load distribution over the two converters. Each of the control systems is provided with an upper and a lower limit value emitter for the control angle. In order to equalize the load distribution between the static converters in the event of a commutation fault in one of them, current sensitive and comparing members are provided which sense the current distribution between the converters. These members emit a signal in the least loaded static converter to the lower limit value emitter in the same static converter for temporarily reducing the lower limit value for the control angle, in response to deviation from the normal current distribution exceeding a certain value.
Inventors
- 👤 G Liss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:52
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/7575; H02M1/00; H02M1/08; H02M1/081; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
Converter station comprising two parallel static converters (10,11), each provided with a control system comprising a current regulator (13,22) which is adjusted in accordance with a certain load distribution over the two static converters, the control systems each being provided with a lower and an upper limit value emitter (18,19) for the control angle, each static converter, in order to equalize the load distribution between the static converters in the event of a commutation fault in one of them, being provided with current-sensitive and comparing members (24,28 and 25,29, respectively) to sense the current distribution between the static conveRters, said members including means to emit a signal in the least loaded static converter by way of a first output (32,33, respectively) to the lower limit value emitter (18) in this static converter for temporary reduction of the lower limit value for the control angle, said last means being responsive to a deviation from the normal current distribution which exceeds a certain threshold.
Claim 2
Dependent Claim
162 words
Converter station comprising two parallel static converters (10,11), each provided with a control system comprising a current regulator (13,22) which is adjusted in accordance with a certain load distribution over the two static converters, the control systems each being provided with a lower and an upper limit value emitter (18,19) for the control angle, each static converter, in order to equalize the load distribution between the static converters in the event of a commutation fault in one of them, being provided with current-sensitive and comparing members (24,28 and 25,29, respectively) to sense the current distribution between the static conveRters, said members including means to emit a signal in the least loaded static converter by way of a first output (32,33, respectively) to the lower limit value emitter (18) in this static converter for temporary reduction of the lower limit value for the control angle, said last means being responsive to a deviation from the normal current distribution which exceeds a certain threshold.
Claim 3
Dependent Claim
65 words
Converter station according to claim 1, in which said comparing members (24,28 and 25,29, respectively) are each provided with a second output (34 and 35, respectively) and include means responsive to such deviation to emit, in the least loaded static converter, from such second output a temporary signal to the current regulator (13 and 22, respectively) of the corresponding static converter to increase the current.
Claim 4
Dependent Claim
67 words
Converter station according to claim 1, in which said comparing members (24,28 and 25,29, respectively) are provided with an output (38,39) common for both static converters, and include means responsive to said deviation to emit from said common output a signal to the upper limit value emitter (19) in both control systems for temporarily reducing the upper limit value of the control angle in both static converters.
Claim 5
Dependent Claim
46 words
Converter station according to claim 1, in which each of said comparing members (24,28 and 25,29, respectively) is provided with a blocking circuit (40 and 41, respectively) responsive to a commutation fault in the corresponding static converter to block the output (30,31) of the comparing members.
Claim 6
Dependent Claim
50 words
Converter station according to claim 1, in which each of said comparing members (24,28 and 25,29, respectively) is provided with a blocking circuit (30 and 31, respectively) which is influenced by the signal from said first output (32 and 33, respectively) in the comparing member of the other static converter.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |