US3971978A
Expired / Lapsed
US
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Generator control system
Assignee: General Electric Co
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Filing: 1975-08-26
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Granted: 1976-07-27
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Expires: 1995-08-26
Abstract
Abstract A generating system employing a generator having a self-excited field winding the excitation of which is achieved by supplying a bridge circuit with signals which are, respectively, proportional to the generator terminal voltage and the load current further includes means to selectively short-circuit the field winding during each cycle of normal generator operation. The system further includes a feedback path or loop for controlling the time during which the field winding is short-circuited which feedback path develops a control signal by comparing a signal representing the voltage supplied to the bridge circuit with a reference signal to develop an error signal which is then modified by a further signal proportional to the Thevenin equivalent voltage of the bridge circuit to thus linearize the feedback loop.
Inventors
- 👤 George S. Chambers
- 👤 Lawrence J. Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
In a generator field excitation system of the type in which the generator output is utilized to provide an excitation current to the generator field winding through an exciter circuit and which further includes means responsive to control pulses to selectively short-circuit the field winding during a portion of each cycle of normal generator operation, means to develop said control pulses comprising: a. circuit means for providing said control pulses in response to a variable input signal; b. means to provide a reference signal of desired magnitude; c. means to provide an additional signal proportional to the amount of field excitation; d. means to compare said reference signal and said additional signal to provide an error signal proportional to the algebraic sum thereof: e. means to provide a correction signal proportional to the Thevenin equivalent voltage of the exciter circuit; and, f. means to divide said error signal by said correction signal to provide said variable input signal.
Claim 2
Dependent Claim
158 words
In a generator field excitation system of the type in which the generator output is utilized to provide an excitation current to the generator field winding through an exciter circuit and which further includes means responsive to control pulses to selectively short-circuit the field winding during a portion of each cycle of normal generator operation, means to develop said control pulses comprising: a. circuit means for providing said control pulses in response to a variable input signal; b. means to provide a reference signal of desired magnitude; c. means to provide an additional signal proportional to the amount of field excitation; d. means to compare said reference signal and said additional signal to provide an error signal proportional to the algebraic sum thereof: e. means to provide a correction signal proportional to the Thevenin equivalent voltage of the exciter circuit; and, f. means to divide said error signal by said correction signal to provide said variable input signal.
Claim 3
Dependent Claim
20 words
The invention in accordance with claim 1 wherein said reference, additional, error, correction and input signals are each voltage signals.
Claim 4
Dependent Claim
41 words
A generator field excitation system of the type in which a generator having an excitable field winding supplies current to a load comprising: a. a field excitation circuit for exciting said field winding in response to first and second signals including,
Claim 5
Dependent Claim
41 words
A generator field excitation system of the type in which a generator having an excitable field winding supplies current to a load comprising: a. a field excitation circuit for exciting said field winding in response to first and second signals including,
Claim 6
Dependent Claim
153 words
means to develop said first signal as a function of the magnitude of the generator output voltage, 2. means to develop said second signal as a function of the magnitude of the current supplied to the load, and 3. means to selectively short-circuit said field winding selectively during a portion of each cycle of normal generator operation in response to control pulses delivered thereto; and, b. means to develop said control pulses including, 1. circuit means for providing said control pulses in response to a variable input signal, 2. means to provide a reference signal of desired magnitude, 3. means to provide an additional signal proportional to the amount of field excitation, 4. means to compare said reference signal and said additional signal to provide an error signal proportional to the algebraic sum thereof, 5. means to provide a correction signal proportional to the Thevenin equivalent voltage of the field exciter circuit, and
Claim 7
Dependent Claim
153 words
means to develop said first signal as a function of the magnitude of the generator output voltage, 2. means to develop said second signal as a function of the magnitude of the current supplied to the load, and 3. means to selectively short-circuit said field winding selectively during a portion of each cycle of normal generator operation in response to control pulses delivered thereto; and, b. means to develop said control pulses including, 1. circuit means for providing said control pulses in response to a variable input signal, 2. means to provide a reference signal of desired magnitude, 3. means to provide an additional signal proportional to the amount of field excitation, 4. means to compare said reference signal and said additional signal to provide an error signal proportional to the algebraic sum thereof, 5. means to provide a correction signal proportional to the Thevenin equivalent voltage of the field exciter circuit, and
Claim 8
Dependent Claim
16 words
means to divide said error signal by said correction signal to provide said variable input signal.
Claim 9
Dependent Claim
16 words
means to divide said error signal by said correction signal to provide said variable input signal.
Claim 10
Dependent Claim
18 words
The invention in accordance with claim 3 wherein said field excitation circuit includes a full wave rectifier bridge.
Claim 11
Dependent Claim
13 words
The invention in accordance with claim 3 wherein all signals are voltage signals.
Claim 12
Dependent Claim
19 words
The invention in accordance with claim 4 wherein the Thevenin equivalent voltage used is that across the rectifier bridge.
Claim 13
Dependent Claim
113 words
A power generation system for supplying power to a load comprising: a. a generator having output terminals and a self-excited field winding; b. circuit means for supplying excitation power to said field winding, said circuit means including, 1. a rectifier bridge circuit for supplying d.c. power to said field winding, 2. first means for supplying power to said bridge in proportion to the terminal voltage of said generator, 3. second means for supplying power to said bridge in proportion to the current supplied to the load from said generator, 4. control means responsive to control pulses to selectively short-circuit said field winding during a portion of each cycle of normal generator operation, and
Claim 14
Dependent Claim
113 words
A power generation system for supplying power to a load comprising: a. a generator having output terminals and a self-excited field winding; b. circuit means for supplying excitation power to said field winding, said circuit means including, 1. a rectifier bridge circuit for supplying d.c. power to said field winding, 2. first means for supplying power to said bridge in proportion to the terminal voltage of said generator, 3. second means for supplying power to said bridge in proportion to the current supplied to the load from said generator, 4. control means responsive to control pulses to selectively short-circuit said field winding during a portion of each cycle of normal generator operation, and
Claim 15
Dependent Claim
92 words
means to generate said control pulses including, i. means to provide a feedback signal proportional to the bridge circuit voltage, ii. means to provide a reference signal of desired magnitude, iii. means to compare the feedback signal and the reference signal to develop an error signal, iv. means to provide a signal proportional to the Thevenin equivalent voltage of said bridge circuit, and v. means to divide said error signal by the signal proportional to the Thevenin equivalent voltage to provide a control signal for governing the generation of said control pulses.
Claim 16
Dependent Claim
92 words
means to generate said control pulses including, i. means to provide a feedback signal proportional to the bridge circuit voltage, ii. means to provide a reference signal of desired magnitude, iii. means to compare the feedback signal and the reference signal to develop an error signal, iv. means to provide a signal proportional to the Thevenin equivalent voltage of said bridge circuit, and v. means to divide said error signal by the signal proportional to the Thevenin equivalent voltage to provide a control signal for governing the generation of said control pulses.
Claim 17
Dependent Claim
27 words
The invention in accordance with claim 7 wherein the first feedback signal is proportional to the vector sum of the generator terminal voltage and the load current.
References Cited (Backward Citations)
US3369171A
Cited
US3548287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |