US3683262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the control of line-commutated converters
Assignee: Siemens AG
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Filing: 1971-08-12
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Granted: 1972-08-08
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Expires: 1991-08-12
Abstract
Abstract In a device for the control of line-commutated converters, the fundamental of the line voltage vector is filtered out by a vector phase filter and is shifted back in phase by an angle corresponding to the desired firing delay angle by a vector rotator as a function of a DC control voltage. The output of the vector rotator then exercises control via an angle switch which determines the trigger pulses of the converter valves at definite, recurring angular positions of the vector quantity fed to it. The control is independent of the wave shape and the frequency of the system.
Inventors
- 👤 Ingemar Neuffer
- 👤 Hermann Waldmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:55
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: 17
Claim 1
Independent Claim
263 words
A device for the control of a line-commutated converter having valves for the transmission of high DC voltage, comprising a vector phase filter having inputs coupled to the line and outputs and associated with the line voltage vector, said vector phase filter comprising a two-phase generator having outputs, a PI control unit having an input and an output connected to the two-phase generator, said two-phase generator being harmonic-free and having a frequency determined by the output of the PI control unit and means coupled between the outputs of the two-phase generator and the input of the PI control unit for energizing the PI control unit by a quantity depending upon the difference between the phase angle ( Beta ) of the line voltage vector and the phase angle ( Beta ) of the vector provided by the output voltages of the two-phase generator, the vector phase filter producing two component voltages at its outputs; a vector rotator having inputs connected to the outputs of the vector phase filter, other inputs and outputs; means connected to the other inputs of the vector rotator for providing two voltages deteRmining the control angle ( Alpha ), the vector rotator producing at its outputs voltages comprising the components of a rotating control vector; an angle switch having inputs connected to the outputs of the vector rotator and outputs, said angle switch being energized by the component voltages of the rotating control vector and providing at its outputs at specific recurring phase positions of the rotating control vector control pulses utilized to fire the valves of the converter.
Claim 2
Independent Claim
263 words
A device for the control of a line-commutated converter having valves for the transmission of high DC voltage, comprising a vector phase filter having inputs coupled to the line and outputs and associated with the line voltage vector, said vector phase filter comprising a two-phase generator having outputs, a PI control unit having an input and an output connected to the two-phase generator, said two-phase generator being harmonic-free and having a frequency determined by the output of the PI control unit and means coupled between the outputs of the two-phase generator and the input of the PI control unit for energizing the PI control unit by a quantity depending upon the difference between the phase angle ( Beta ) of the line voltage vector and the phase angle ( Beta ) of the vector provided by the output voltages of the two-phase generator, the vector phase filter producing two component voltages at its outputs; a vector rotator having inputs connected to the outputs of the vector phase filter, other inputs and outputs; means connected to the other inputs of the vector rotator for providing two voltages deteRmining the control angle ( Alpha ), the vector rotator producing at its outputs voltages comprising the components of a rotating control vector; an angle switch having inputs connected to the outputs of the vector rotator and outputs, said angle switch being energized by the component voltages of the rotating control vector and providing at its outputs at specific recurring phase positions of the rotating control vector control pulses utilized to fire the valves of the converter.
Claim 3
Dependent Claim
133 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the two-phase generator of the vector phase filter comprises a first integrator having an input and an output, a first multiplier connected to the input of the first integrator for controlling the frequency thereof, a second multiplier, said first integrator having a negative feedback via the second multiplier for amplitude control, a second integrator having an input and an output, a third multiplier connected between the output of the first integrator and the input of the second integrator for controlling the frequency thereof, the first and second integrators and the first and third multipliers being connected in series circuit arrangement, and a fourth multiplier, said second integrator having a negative feedback via the fourth multiplier for amplitude control.
Claim 4
Dependent Claim
34 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the sum of the squares of the two voltages determining the control angle ( Alpha ) is always constant.
Claim 5
Dependent Claim
73 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the means for providing two voltages determining the control angle ( Alpha ) comprises a linearizing function generator providing a control voltage (USt) and wherein one of the voltages determining the control angle ( Alpha ) is constant and the other of the voltages determining the control angle is the control voltage provided by the linearizing function generator.
Claim 6
Dependent Claim
188 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the vector rotator comprises first, second, third and fourth multipliers each having two inputs and an output, one of the inputs of the vector rotator being connected to a first input of each of the first and second multipliers, the other of the inputs of the vector rotator being connected to a first input of each of the third and fourth multipliers, one of the other inputs of the vector rotator being connected to the second input of each of the first and third multipliers, the other of the other inputs of the vector rotator being connected to the second input of each of the second and fourth multipliers, a first operational amplifier having a subtractive input connected to the output of the third multiplier and an additive input connected to the output of the second multiplier, and a second operational amplifier having a subtractive input connected to the output of the second multiplier and an additive input connected to the output of the first multiplier and the output of the fourth multiplier.
Claim 7
Dependent Claim
82 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the angle switch comprises a plurality of adding amplifiers having inputs connected to the outputs of the vector rotator and outputs, a plurality of threshold monitors each having an input connected to the output of a corresponding one of the adding amplifiers, and a plurality of AND gates having inputs connected to selected ones of the threshold monitors and outputs comprising the outputs of said angle switch.
Claim 8
Dependent Claim
71 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the vector phase filter further comprises a multiplier having an input connected to an output of the two-phase generator, another input and an output, means for applying a related line voltage (URS) to the other input of the multiplier, and smoothing means connected between the output of the multiplier and an input of thE two-phase generator.
Claim 9
Dependent Claim
117 words
A device for the control of a line-commutated converter as claimed in claim 1, wherein the vector phase filter further comprises a pair of multipliers each having an input connected to a corresponding one of the outputs of the two-phase generator, another input and an output, means for applying a related line voltage (URS) to the other inputs of the multipliers, adder means having inputs connected to the outputs of the multipliers and an output connected to the input of the PI control unit for applying the sum of the outputs of the multipliers to said PI control unit, and amplitude shaping means for the related line voltage (URS) connected to an input of the two-phase generator.
Claim 10
Dependent Claim
132 words
A device for the control of a line-commutated converter as claimed in claim 2, wherein each of the second and fourth multipliers of the two-phase generator of the vector phase filter has an additional input and said two-phase generator further comprises an amplitude regulator having an integrating characteristic having an input and an output connected to the additional input of each of said second and fourth multipliers, adder means connected to the input of amplitude regulator, and means for applying to the adder means a constant voltage (K22) and the sum of the squared output voltages of the two-phase generator in a manner whereby the difference between the constant voltage (K22) and the sum of the squared output voltages of the two-phase generator is applied to the input of the amplitude regulator.
Claim 11
Dependent Claim
139 words
A device for the control of a line-commutated converter as claimed in claim 3, wherein the means for providing two voltages determining the control angle ( Alpha ) comprises means for providing a control voltage (Ust), a squaring function generator having an input connected to said means for providing a control voltage and an output, an adder having a subtractive input connected to the output of the squaring function generator, an additive input and an output, means for applying a constant voltage to the additive input of the adder, and a root-deriving function generator having an input connected to the output of the adder and an output connected to one of the other inputs of the vector rotator, said means for providing a control voltage (Ust) being connected to the other of the other inputs of the vector rotator.
Claim 12
Dependent Claim
115 words
A device for the control of a line-commutated converter as claimed in claim 4, wherein the linearizing function generator comprises a plurality of pairs of Zener diodes, a plurality of input resistors, each pair of Zener diodes being connected in series circuit arrangement with a corresponding one of the input resistors, each series circuit arrangement being connected in shunt with the others and an additional one of the input resistors being connected in shunt with the series circuit arrangements, a DC amplifier having a negative feedback, an input connected to said Zener diodes and said input resistors and an output, and an inverting amplifier having an input connected to the output of the DC amplifier.
Claim 13
Dependent Claim
96 words
A device for the control of a line-commutated converter as claimed in claim 8, wherein the amplitude shaping means comprises a rectifier having an input connected to the means for applying the related line voltage (URS) and an output, smoothing means having an input connected to the output of the rectifier and an output, an amplifier having an input connected to the output of the smoothing means and an output, and a squaring function generator having an input connected to an output of the amplifier and an output connected to an input of the two-phase generator.
Claim 14
Dependent Claim
96 words
A device for the control of a line-commutated converter as claimed in claim 8, wherein the amplitude shaping means comprises filter means having an input connected to the means for applying the related line voltage (URS) and an output, a squaring function generator having an input connected To the output of the filter means, smoothing means having an input connected to the output of the squaring function generator and an output, and an amplifier having an input connected to the output of the smoothing means and an output connected to an input of the two-phase generator.
Claim 15
Dependent Claim
67 words
A device for the control of a line-commutated converter as claimed in claim 8, further comprising additional adder means having an input connected to the output of the PI control unit, another input and an output connected to a frequency control input of the two-phase generator, and means for applying a voltage (Uf) proportional to the line frequency to the other input of the additional adder means.
Claim 16
Independent Claim
314 words
A device for the control of a line-commutated converter having valves for the transmission of high DC voltage, comprising a plurality of vector phase filters, one for each phase on the line, each vector phase filter having inputs coupled to the line and outputs and associated with the line voltage vector, said vector phase filter comprising a two-phase generator having outputs, a PI control unit having an input and an output connected to the two-phase generator, said two-phase generator being harmonic-free and having a frequency determined by the output of the PI control unit and means coupled between the outputs of the two-phase generator and the input of the PI control unit for energizing the PI control unit by a quantity depending upon the difference between the phase angle ( Beta ) of the line voltage vector and the phase angle ( Beta ) of the vector provided by the output voltages of the two-phase generator, the vector phase filter producing two component voltages at its outputs; a plurality of vector rotators, one for each phase on the line, each vector rotator having inputs connected to the outputs of a corresponding one of the vector phase filters, other inputs and outputs; means connected to the other inputs of each of the vector rotators for providing two voltages determining the control angle ( Alpha ), each vector rotator producing at its outputs voltages comprising the components of a rotating control vector; a plurality of angle switches, one for each phase on the line, each angle switch having inputs connected to the outputs of a corresponding one of the vector rotators and outputs, each of the angle switches being energized by the component voltages of the corresponding rotating control vector and providing at its outputs at specific recurring phase positions of the corresponding rotating control vector control pulses utilized to fire the valves of the converter.
Claim 17
Independent Claim
314 words
A device for the control of a line-commutated converter having valves for the transmission of high DC voltage, comprising a plurality of vector phase filters, one for each phase on the line, each vector phase filter having inputs coupled to the line and outputs and associated with the line voltage vector, said vector phase filter comprising a two-phase generator having outputs, a PI control unit having an input and an output connected to the two-phase generator, said two-phase generator being harmonic-free and having a frequency determined by the output of the PI control unit and means coupled between the outputs of the two-phase generator and the input of the PI control unit for energizing the PI control unit by a quantity depending upon the difference between the phase angle ( Beta ) of the line voltage vector and the phase angle ( Beta ) of the vector provided by the output voltages of the two-phase generator, the vector phase filter producing two component voltages at its outputs; a plurality of vector rotators, one for each phase on the line, each vector rotator having inputs connected to the outputs of a corresponding one of the vector phase filters, other inputs and outputs; means connected to the other inputs of each of the vector rotators for providing two voltages determining the control angle ( Alpha ), each vector rotator producing at its outputs voltages comprising the components of a rotating control vector; a plurality of angle switches, one for each phase on the line, each angle switch having inputs connected to the outputs of a corresponding one of the vector rotators and outputs, each of the angle switches being energized by the component voltages of the corresponding rotating control vector and providing at its outputs at specific recurring phase positions of the corresponding rotating control vector control pulses utilized to fire the valves of the converter.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |