US5489838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for generating a synchronizing signal for a controlled series compensator
Assignee: Siemens AG
•
Filing: 1993-05-17
•
Granted: 1996-02-06
•
Expires: 2013-05-17
Abstract
Abstract A method and apparatus is described for generating a synchronizing signal for a firing-circuit subassembly to trigger a power converter valve of a controlled series compensator. According to the invention, a sinusoidal substitute variable is provided, which can be either a measured line current or the sum of a capacitor current and a valve current, such that the zero crossings of said substitute variable do not vary. This substitute variable is modified in terms of its phase position so that a synchronizing signal that corresponds to the phase position of the capacitor voltage of the series capacitor of the controlled series compensator is made available to the firing-circuit subassembly. The result, even in the bypassed state, is a sinusoidal synchronizing signal whose zero crossings do not vary, so that operating stability problems no longer occur in the transient state during operation close to resonance.
Inventors
- 👤 Karl-Friedrich Leowald
- 👤 Stephan Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:47
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1807; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
Method for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: supplying measured conductor current of a transmission line to a synchronizing signal generator; generating in said synchronizing signal generator a synchronizing signal; supplying said synchronizing signal to a firing-circuit subassembly; generating in said firing-circuit subassembly firing pulses for a power converter valve in a controlled series compensator serially incorporated into said transmission line; such that said measured conductor current of said transmission line is phase-shifted by 90° from a measured capacitor voltage in said controlled series compensator.
Claim 2
Dependent Claim
93 words
Method for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: supplying measured conductor current of a transmission line to a synchronizing signal generator; generating in said synchronizing signal generator a synchronizing signal; supplying said synchronizing signal to a firing-circuit subassembly; generating in said firing-circuit subassembly firing pulses for a power converter valve in a controlled series compensator serially incorporated into said transmission line; such that said measured conductor current of said transmission line is phase-shifted by 90° from a measured capacitor voltage in said controlled series compensator.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein disturbance signals in said measured conductor current are suppressed before said measured conductor current is phase-shifted by 90°.
Claim 4
Dependent Claim
137 words
Method for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: supplying measured capacitor current of a controlled series compensator serially incorporated into a transmission line to a logic element; supplying measured valve current from a power converter valve in said controlled series compensator to said logic element; combining said measured capacitor current and said measured valve current in said logic element to form a substitute current signal; supplying said substitute current signal to a synchronizing signal generator; generating in said synchronizing signal generator a synchronizing signal; supplying said synchronizing signal to a firing-circuit subassembly; generating in said firing-circuit subassembly firing pulses for said power converter valve in said controlled series compensator; such that said substitute current signal is phase-shifted by 90° from a measured capacitor voltage in said controlled series compensator.
Claim 5
Dependent Claim
137 words
Method for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: supplying measured capacitor current of a controlled series compensator serially incorporated into a transmission line to a logic element; supplying measured valve current from a power converter valve in said controlled series compensator to said logic element; combining said measured capacitor current and said measured valve current in said logic element to form a substitute current signal; supplying said substitute current signal to a synchronizing signal generator; generating in said synchronizing signal generator a synchronizing signal; supplying said synchronizing signal to a firing-circuit subassembly; generating in said firing-circuit subassembly firing pulses for said power converter valve in said controlled series compensator; such that said substitute current signal is phase-shifted by 90° from a measured capacitor voltage in said controlled series compensator.
Claim 6
Dependent Claim
24 words
The method of claim 3, wherein disturbance signals in said substitute current signal are suppressed before said substitute current signal is phase-shifted by 90°.
Claim 7
Independent Claim
181 words
An apparatus for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: a controlled series compensator serially integrated into a transmission line, including: a capacitor coupled serially within said transmission line, and a power converter valve coupled parallel to said capacitor; a current detection device coupled to said transmission line and measuring a conductor current of said transmission line; a synchronizing signal generator having a current input and a frequency input and generating a synchronizing signal, said current detection device being coupled to said current input of said synchronizing signal generator and supplying said measured conductor current to said synchronizing signal generator, such that said frequency input of said synchronizing signal generator receives a frequency signal from said transmission line; and a firing-circuit subassembly coupled to said synchronizing signal generator and receiving said synchronizing signal, said firing-circuit subassembly generating firing pulses for said power converter valve in said controlled series compensator, such that said measured conductor current of said transmission line is phase-shifted by 90° from a voltage across said capacitor in said controlled series compensator.
Claim 8
Independent Claim
181 words
An apparatus for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: a controlled series compensator serially integrated into a transmission line, including: a capacitor coupled serially within said transmission line, and a power converter valve coupled parallel to said capacitor; a current detection device coupled to said transmission line and measuring a conductor current of said transmission line; a synchronizing signal generator having a current input and a frequency input and generating a synchronizing signal, said current detection device being coupled to said current input of said synchronizing signal generator and supplying said measured conductor current to said synchronizing signal generator, such that said frequency input of said synchronizing signal generator receives a frequency signal from said transmission line; and a firing-circuit subassembly coupled to said synchronizing signal generator and receiving said synchronizing signal, said firing-circuit subassembly generating firing pulses for said power converter valve in said controlled series compensator, such that said measured conductor current of said transmission line is phase-shifted by 90° from a voltage across said capacitor in said controlled series compensator.
Claim 9
Dependent Claim
18 words
The apparatus of claim 5 wherein said synchronizing signal generator comprises a servo synchronizer generating said synchronizing signal.
Claim 10
Dependent Claim
16 words
The apparatus of claim 6, wherein said servo synchronizer is implemented as a digital signal processor.
Claim 11
Dependent Claim
314 words
The apparatus of claim 6, wherein said servo synchronizer comprises an amplitude input, a current input and a frequency input, said frequency input receiving said frequency signal from said transmission line, said synchronizing signal generator further comprising: a frequency adaptation device having an input and an output, said frequency signal being supplied to said input of said frequency adaptation device, said frequency adaptation device generating a signal proportional to a frequency of said frequency signal; a digital filter having a current input, a frequency input, and an output, said conductor current being supplied to the current input of said digital filter, said proportional signal of said frequency adaptation device being supplied to said frequency input of said digital filter, said digital filter modifying said conductor current by removing higher harmonics of said conductor current based on said proportional frequency signal; an analog filter having a current input, a frequency input, and an output, said proportional frequency signal of said frequency adaptation device being supplied to said frequency input of said analog filter, said modified conductor current being supplied to said current input of said analog filter, said analog filter smoothing said modified conductor current based on said proportional frequency signal, said analog filter supplying said smoothed, modified current signal to said current input of said servo synchronizer; and an amplitude adaptation device having a current input and an output, said conductor current signal being supplied to said current input of said amplitude adaptation device, said amplitude adaptation device generating a signal proportional to an amplitude of said conductor current and supplying said proportional amplitude signal to the amplitude input of said servo synchronizer; such that said servo synchronizer generates synchronizing signals for said firing-circuit subassembly to reduce phase errors in said conductor current in dependence on said smoothed, modified current signal from said analog filter and said proportional amplitude signal and said frequency signal.
Claim 12
Dependent Claim
25 words
The apparatus of claim 8 wherein said amplitude adaptation device, said frequency adaptation device, and said digital filter are implemented as a digital signal processor.
Claim 13
Independent Claim
292 words
An apparatus for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: a controlled series compensator serially integrated into a transmission line, including: a capacitor coupled serially within said transmission line, and a series connection comprising a power converter valve coupled in series to a coil, said series connection coupled in parallel to said capacitor; a first current detection device coupled to said transmission line and measuring a capacitor current through said capacitor serially coupled within said transmission line; a second current detection device coupled to said power converter valve and measuring a valve current through said power converter valve; a logic element having first and second inputs and an output, said first input of said logic element receiving said capacitor current from said first current detection device and said second input of said logic element receiving said valve current from said second current detection device, such that said logic element combines said capacitor current and said valve current to form a substitute current signal supplied to said output of said logic element; a synchronizing signal generator having a current input and a frequency input and generating a synchronizing signal, said logic element being coupled to said synchronizing signal generator such that said substitute current signal is supplied to said current input of said synchronizing signal generator, such that said frequency input of said synchronizing signal generator receives a frequency signal from said transmission line; and a firing-circuit subassembly coupled to said synchronizing signal generator and receiving said synchronizing signal, said firing-circuit subassembly generating firing pulses for said power converter valve in said controlled series compensator, such that said substitute current signal is phase-shifted by 90° from a voltage across said capacitor in said controlled series compensator.
Claim 14
Independent Claim
292 words
An apparatus for generating a synchronizing signal for a firing-circuit subassembly of a controlled series compensator, comprising: a controlled series compensator serially integrated into a transmission line, including: a capacitor coupled serially within said transmission line, and a series connection comprising a power converter valve coupled in series to a coil, said series connection coupled in parallel to said capacitor; a first current detection device coupled to said transmission line and measuring a capacitor current through said capacitor serially coupled within said transmission line; a second current detection device coupled to said power converter valve and measuring a valve current through said power converter valve; a logic element having first and second inputs and an output, said first input of said logic element receiving said capacitor current from said first current detection device and said second input of said logic element receiving said valve current from said second current detection device, such that said logic element combines said capacitor current and said valve current to form a substitute current signal supplied to said output of said logic element; a synchronizing signal generator having a current input and a frequency input and generating a synchronizing signal, said logic element being coupled to said synchronizing signal generator such that said substitute current signal is supplied to said current input of said synchronizing signal generator, such that said frequency input of said synchronizing signal generator receives a frequency signal from said transmission line; and a firing-circuit subassembly coupled to said synchronizing signal generator and receiving said synchronizing signal, said firing-circuit subassembly generating firing pulses for said power converter valve in said controlled series compensator, such that said substitute current signal is phase-shifted by 90° from a voltage across said capacitor in said controlled series compensator.
Claim 15
Dependent Claim
18 words
The apparatus of claim 10 wherein said synchronizing signal generator comprises a servo synchronizer generating said synchronizing signal.
Claim 16
Dependent Claim
16 words
The apparatus of claim 11, wherein said servo synchronizer is implemented as a digital signal processor.
Claim 17
Dependent Claim
314 words
The apparatus of claim 11, wherein said servo synchronizer comprises an amplitude input, a current input and a frequency input, said frequency input receiving said frequency signal from said transmission line, said synchronizing signal generator further comprising: a frequency adaptation device having an input and an output, said frequency signal being supplied to said input of said frequency adaptation device, said frequency adaptation device generating a signal proportional to a frequency of said frequency signal; a digital filter having a current input, a frequency input, and an output, said conductor current being supplied to the current input of said digital filter, said proportional frequency signal of said frequency adaptation device being supplied to said frequency input of said digital filter, said digital filter modifying said conductor current by removing higher harmonics of said conductor current based on said proportional frequency signal; an analog filter having a current input, a frequency input, and an output, said proportional signal of said frequency adaptation device being supplied to said frequency input of said analog filter, said modified conductor current being supplied to said current input of said analog filter, said analog filter smoothing said modified conductor current based on said proportional frequency signal, said analog filter supplying said smoothed, modified current signal to said current input of said servo synchronizer; and an amplitude adaptation device having a current input and an output, said conductor current signal being supplied to said current input of said amplitude adaptation device, said amplitude adaptation device generating a signal proportional to an amplitude of said conductor current and supplying said proportional amplitude signal to the amplitude input of said servo synchronizer; such that said servo synchronizer generates synchronizing signals for said firing-circuit subassembly to reduce phase errors in said conductor current in dependence on said smoothed, modified current signal from said analog filter and said proportional amplitude signal and said frequency signal.
Claim 18
Dependent Claim
25 words
The apparatus of claim 13 wherein said amplitude adaptation device, said frequency adaptation device, and said digital filter are implemented as a digital signal processor.
References Cited (Backward Citations)
US4292545A
Cited
WO1987004538A1
Cited
US5032738A
Cited
EP0298515A1
Cited
US4859884A
Cited
US4999565A
Cited
EP0442455A2
Cited
US5367197A
Cited
US5134356A
Cited
US5227713A
Cited
US5198746A
Cited
US5202583A
Cited
US5374853A
Cited
US5424627A
Cited
US5291120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |