US3582755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for converters
Assignee: ABB Norden Holding AB
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Filing: 1969-10-09
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Granted: 1971-06-01
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Expires: 1989-10-09
Abstract
Abstract A static converter connecting an AC network with a DC line has a control system in which an AC control function voltage is derived from the AC network, while a DC regulator voltage is derived from a regulator. The control system further comprises a first arrangement for deriving the actual time between subsequent following control pulses for the valves of the converter and a second arrangement for deriving a desired value for said time corresponding to the relation between the period time of the AC network and number of pulses of the converter. The difference between said actual time and its desired value is stored in a memory circuit for each valve and as a correction magnitude taken together with the control function voltage and the regulator voltage.
Inventors
- 👤 Gote Liss
- 👤 Ake Ekstrom
- 👤 Rolf Ljungqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/7575; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
Control system for a static converter comprising a control pulse generator which in dependence of its input signal delivers control pulses with a certain delay angle to the valves of the converter, said input signal consisting essentially of the sum of a DC magnitude from a control amplifier and an AC magnitude in the form of a control function voltage derived from an AC network connected to the converter, in which the control system further comprises a first means for measuring the intervals between consecutive control pulses for the valves, a second means for deriving a desired value for said intervAls corresponding to the relation between the period time for said AC network and the pulse number of the converter and a third means connected to said first and second means for deriving the difference between the actual and the desired value of said intervals, a memory circuit for each valve connected to said third means for storing said time difference, and connecting means for supplying said time difference as a correction magnitude to the input side of the control pulse generator.
Claim 2
Dependent Claim
182 words
Control system for a static converter comprising a control pulse generator which in dependence of its input signal delivers control pulses with a certain delay angle to the valves of the converter, said input signal consisting essentially of the sum of a DC magnitude from a control amplifier and an AC magnitude in the form of a control function voltage derived from an AC network connected to the converter, in which the control system further comprises a first means for measuring the intervals between consecutive control pulses for the valves, a second means for deriving a desired value for said intervAls corresponding to the relation between the period time for said AC network and the pulse number of the converter and a third means connected to said first and second means for deriving the difference between the actual and the desired value of said intervals, a memory circuit for each valve connected to said third means for storing said time difference, and connecting means for supplying said time difference as a correction magnitude to the input side of the control pulse generator.
Claim 3
Dependent Claim
32 words
Control system according to claim 1, further comprising feedback circuit means connecting the memory circuits of the different valves for transmitting the correction magnitude for one valve to influence the following valves.
Claim 4
Dependent Claim
36 words
Control system according to claim 1, in which said third means comprises a summation member for summation of all the correction magnitudes, the output from this member being connected to the input of said memory circuits.
Claim 5
Dependent Claim
22 words
Control system according to claim 1, further including a limiting means for said correction magnitudes for limiting the correction at great disymmetries.
References Cited (Backward Citations)
US3445742A
Cited
US3434031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |