US6355987B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power converter and control for microturbine
Assignee: General Electric Co
•
Filing: 2000-06-27
•
Granted: 2002-03-12
•
Expires: 2020-06-27
Abstract
Abstract An arrangement and method for controlling a microturbine. Back-to-back inverters are provided such that a second inverter provides power to the DC bus prior to achieving self-sustaining operation of the turbine, and a first converter provides power to the DC bus and optionally controls its voltage once the turbine is self-sustaining. The second inverter operates in either AC utility voltage and frequency control mode or output current control mode depending upon the needs of the application.
Inventors
- 👤 Paul S. Bixel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:05
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/08
Claims Analysis
Total Claims: 76
Claim 1
Independent Claim
100 words
A turbogenerator/motor control arrangement for connection to an AC power grid, comprising: at least one AC generator; at least one turbine operatively connected to the generator; a first converter operatively connected to the generator; a second converter operatively connected between the first converter and an electric utility interface; and a DC bus operatively connected to the first and second converters, wherein power is supplied to the DC bus via the second converter during a first starting mode of the turbogenerator and power is supplied to the DC bus by the first converter during the second “generating” mode of the turbogenerator.
Claim 2
Dependent Claim
100 words
A turbogenerator/motor control arrangement for connection to an AC power grid, comprising: at least one AC generator; at least one turbine operatively connected to the generator; a first converter operatively connected to the generator; a second converter operatively connected between the first converter and an electric utility interface; and a DC bus operatively connected to the first and second converters, wherein power is supplied to the DC bus via the second converter during a first starting mode of the turbogenerator and power is supplied to the DC bus by the first converter during the second “generating” mode of the turbogenerator.
Claim 3
Dependent Claim
24 words
The arrangement of claim 1 , wherein the DC bus voltage is controlled by the first converter in the second mode of the turbogenerator.
Claim 4
Dependent Claim
32 words
The arrangement of claim 1 , further comprising a switch, inductor, and battery connected in series between the second converter to allow DC bus power to be supplied by the second converter.
Claim 5
Dependent Claim
22 words
The arrangement of claim 1 , further comprising a harmonic filter connected to the second converter, the harmonic filter attenuating voltage harmonics.
Claim 6
Dependent Claim
19 words
The arrangement of claim 1 , wherein the first and second converters include a plurality of solid state switches.
Claim 7
Dependent Claim
21 words
The arrangement of claim 1 , wherein the AC generator is one of a permanent magnet generator or an induction generator.
Claim 8
Dependent Claim
14 words
The arrangement of claim 5 , wherein the switches are insulated gate bipolar transistors.
Claim 9
Dependent Claim
18 words
The arrangement of claim 1 , wherein a voltage supplied to the turbogenerator is a utility frequency voltage.
Claim 10
Dependent Claim
19 words
The arrangement of claim 1 , wherein the second inverter includes three or more solid state switching device channels.
Claim 11
Dependent Claim
19 words
The arrangement of claim 9 , wherein the three or more solid state switching device channels are IGBT channels.
Claim 12
Dependent Claim
28 words
The arrangement of claim 1 , further comprising means to maintain an exhaust gas temperature of the generator at a substantially constant value while supplying utility frequency voltage.
Claim 13
Dependent Claim
23 words
The arrangement of claim 11 , wherein the means to maintain the exhaust gas temperature includes a fuel command proportional integral control loop.
Claim 14
Dependent Claim
23 words
The arrangement of claim 11 , wherein the means to maintain the exhaust gas temperature includes a current command proportional integral control loop.
Claim 15
Dependent Claim
31 words
The arrangement of claim 11 , wherein the means to maintain the exhaust gas temperature includes a fuel command proportional integral control loop and a current command proportional integral control loop.
Claim 16
Dependent Claim
20 words
The arrangement of claim 12 , wherein the fuel command proportional integral control loop includes a power proportional integral control.
Claim 17
Dependent Claim
20 words
The arrangement of claim 12 , wherein the fuel command proportional integral control loop includes a speed proportional integral control.
Claim 18
Dependent Claim
26 words
The arrangement of claim 12 , wherein the fuel command proportional integral control loop includes a power proportional integral control and a speed proportional integral control.
Claim 19
Dependent Claim
23 words
The arrangement of claim 17 , wherein the speed proportional integral control has a higher sampling time than the power proportional integral control.
Claim 20
Dependent Claim
47 words
The arrangement of claim 17 , wherein said fuel command proportional integral control loop additionally includes a minimum DC bus voltage proportional integral control and a selector to select the highest signal from said speed proportional integral control and said minimum DC bus voltage proportional integral control.
Claim 21
Dependent Claim
22 words
The arrangement of claim 13 , wherein said current command proportional integral control loop includes an exhaust gas temperature proportional integral control.
Claim 22
Dependent Claim
21 words
The arrangement claim 13 , wherein said current command proportional integral control loop includes a lower bus voltage proportional integral control.
Claim 23
Dependent Claim
30 words
The arrangement of claim 13 , wherein said current command proportional integral control loop includes an exhaust gas temperature proportional integral control and a lower bus voltage proportional integral control.
Claim 24
Dependent Claim
27 words
The arrangement of claim 22 , wherein said lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 25
Dependent Claim
79 words
The arrangement of claim 11 , wherein said means to maintain the exhaust gas temperature from said gas turbine engine of said permanent magnet turbogenerator/motor at a substantially constant value while supplying utility frequency voltage includes a fuel command proportional integral control loop having a power proportional integral control and a speed proportional integral control, and a current command proportional integral control loop having an exhaust gas temperature proportional integral control and a lower bus voltage proportional integral control.
Claim 26
Dependent Claim
23 words
The arrangement of claim 24 , wherein said speed proportional integral control has a higher sampling time than said power proportional integral control.
Claim 27
Dependent Claim
47 words
The arrangement of claim 25 , wherein said fuel command proportional integral control loop additionally includes a minimum DC bus voltage proportional integral control and a selector to select the highest signal from said speed proportional integral control and said minimum DC bus voltage proportional integral control.
Claim 28
Dependent Claim
27 words
The arrangement of claim 24 , wherein said lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 29
Dependent Claim
44 words
The arrangement of claim 24 , wherein said speed proportional integral control has a higher sampling time than said power proportional integral control, and said lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 30
Dependent Claim
25 words
The arrangement of claim 24 , wherein said power proportional integral control has a lower sampling time than said exhaust gas temperature proportional integral control.
Claim 31
Dependent Claim
25 words
The arrangement of claim 24 , wherein said exhaust gas temperature proportional integral control has a lower sampling time than said speed proportional integral control.
Claim 32
Dependent Claim
25 words
The arrangement of claim 24 , wherein said speed proportional integral control has a lower sampling time than said lower bus voltage proportional integral control.
Claim 33
Dependent Claim
62 words
The arrangement of claim 24 , wherein said power proportional integral control has a lower sampling time than said exhaust gas temperature proportional integral control, said exhaust gas temperature proportional integral control has a lower sampling time than said speed proportional integral control, and said speed proportional integral control has a lower sampling time than said lower bus voltage proportional integral control.
Claim 34
Dependent Claim
84 words
The arrangement of claim 1 , further comprising an energy storage and discharge system operatively connected to at least one of the first and second converters to provide electrical energy to the connected converter, when utility electrical power is unavailable to start the AC generator, during self-sustained operation when the connected converter cannot meet an instantaneous load requirement, after shutdown to continue motoring the turbine of the AC generator to cool down the AC generator, and to otherwise store electrical energy during self-sustained operation.
Claim 35
Dependent Claim
19 words
The arrangement of claim 33 , wherein said connected converter includes a plurality of solid state switching device channels.
Claim 36
Dependent Claim
21 words
The arrangement of claim 34 , wherein said plurality of solid state switching device channels in said connected converter is four.
Claim 37
Dependent Claim
17 words
The arrangement of claim 35 , wherein said four solid state switching device channels are IGBT channels.
Claim 38
Dependent Claim
44 words
The arrangement of claim 33 , wherein the energy storage and discharge system includes an off-load device having an off-load resistor and an off-load switching device in series, and a switching device having a charge switching device and a discharge switching device in series.
Claim 39
Dependent Claim
52 words
The arrangement of claim 37 , wherein the energy storage and discharge system includes an energy storage and discharge device connected across said discharge switching device, and said energy storage and discharge device includes a main power switch, and a precharge switch and precharge resistor in parallel with the main power switch.
Claim 40
Dependent Claim
52 words
The arrangement of claim 38 , wherein the wherein said energy storage and discharge system includes a series inductor and a parallel capacitor between said discharge switching device and said energy storage and discharge device to filter the pulse width modulated waveforn from said charge switching device and said discharge switching device.
Claim 41
Dependent Claim
108 words
The arrangement of claim 33 , wherein the energy storage and discharge system includes an off-load device having an off-load resistor and an off-load switching device in series, a switching device having a charge switching device and a discharge switching device in series, a battery connected across the discharge switching device, a main power switch in series with the battery, a precharge switch and a precharge resistor in parallel with the main power switch, and a series inductor and a parallel capacitor between the discharge switching device and the battery to filter a pulse width modulated waveform transmitted from the charge switching device and the discharge switching device.
Claim 42
Independent Claim
83 words
A method for controlling a generator, comprising the steps of: providing electrical power to the generator through a first converter, a second converter, and a DC bus converter operatively connected to the generator, the first and second converters operating in a first mode to achieve self-sustaining operation of the generator or during a cool down cycle of the turbine; supplying voltage from the generator to the DC bus and to the second converter through the first converter in a second mode of operation.
Claim 43
Independent Claim
83 words
A method for controlling a generator, comprising the steps of: providing electrical power to the generator through a first converter, a second converter, and a DC bus converter operatively connected to the generator, the first and second converters operating in a first mode to achieve self-sustaining operation of the generator or during a cool down cycle of the turbine; supplying voltage from the generator to the DC bus and to the second converter through the first converter in a second mode of operation.
Claim 44
Dependent Claim
41 words
The method of claim 41 , further comprising the step of: providing electrical energy to the first inverter when utility electrical power is unavailable to start the generator and during self-sustained operation when the generator cannot meet an instantaneous load requirement.
Claim 45
Dependent Claim
65 words
The method of claim 41 , further comprising the step of providing an energy storage and discharge system for the first and second converters to provide electrical energy to the first converter when utility electrical power is unavailable to start the generator and during self sustained operation when the generator cannot meet an instantaneous load requirement and to otherwise store electrical energy during self-sustained operation.
Claim 46
Dependent Claim
24 words
The method of claim 41 , wherein the DC bus voltage is controlled according to a first technique during the first mode of operation.
Claim 47
Dependent Claim
30 words
The method of claim 44 , wherein the first technique includes controlling the DC bus voltage based on an AC voltage present on a power grid associated with the generator.
Claim 48
Dependent Claim
23 words
The method of claim 44 , wherein the DC bus voltage is controlled by a second technique during the second mode of operation.
Claim 49
Dependent Claim
43 words
The method of claim 46 , wherein the second technique includes controlling the bus voltage by generating voltages from one or more switches associated with the first converter, and producing reactive currents in the generator by providing the generated voltages to the generator.
Claim 50
Dependent Claim
20 words
The method of claim 41 , further comprising the step of filtering the voltage prior to the step of supplying.
Claim 51
Dependent Claim
84 words
A turbine controller, comprising: an AC generator connected to the turbine; a first converter connected to the generator; a second converter connected to the first converter and to an AC power grid; and a DC bus operatively connected to the first and second converters, wherein power is supplied to the DC bus via the second converter during a first starting mode of the generator and power is supplied to the DC bus by the first converter during a second operating mode of the generator.
Claim 52
Dependent Claim
84 words
A turbine controller, comprising: an AC generator connected to the turbine; a first converter connected to the generator; a second converter connected to the first converter and to an AC power grid; and a DC bus operatively connected to the first and second converters, wherein power is supplied to the DC bus via the second converter during a first starting mode of the generator and power is supplied to the DC bus by the first converter during a second operating mode of the generator.
Claim 53
Dependent Claim
16 words
The controller of claim 49 , where in the AC generator is a permanent magnet generator.
Claim 54
Dependent Claim
62 words
The controller of claim 49 , further comprising: an energy storage and discharge system for the first and second converters to provide electrical energy to the first converter when utility electrical power is unavailable to start the generator and during self sustained operation when the first converter cannot meet an instantaneous load requirement and to otherwise store electrical energy during self-sustained operation.
Claim 55
Dependent Claim
32 words
The controller of claim 49 , further comprising an exhaust gas temperature regulator operatively connected to maintain an exhaust gas temperature of the generator at a substantially constant value while supplying power.
Claim 56
Dependent Claim
17 words
The controller of claim 52 , wherein the regulator includes a fuel command proportional integral control loop.
Claim 57
Dependent Claim
17 words
The controller of claim 52 , wherein the regulator includes a current command proportional integral control loop.
Claim 58
Dependent Claim
25 words
The controller of claim 52 , wherein the regulator includes a fuel command proportional integral control loop and a current command proportional integral control loop.
Claim 59
Dependent Claim
20 words
The controller of claim 53 , wherein the fuel command proportional integral control loop includes a power proportional integral control.
Claim 60
Dependent Claim
20 words
The controller of claim 53 , wherein the fuel command proportional integral control loop includes a speed proportional integral control.
Claim 61
Dependent Claim
26 words
The controller of claim 53 , wherein the fuel command proportional integral control loop includes a power proportional integral control and a speed proportional integral control.
Claim 62
Dependent Claim
23 words
The controller of claim 58 , wherein the speed proportional integral control has a higher sampling time than the power proportional integral control.
Claim 63
Dependent Claim
47 words
The controller of claim 58 , wherein the fuel command proportional integral control loop additionally includes a minimum DC bus voltage proportional integral control and a selector to select the highest signal from said speed proportional integral control and said minimum DC bus voltage proportional integral control.
Claim 64
Dependent Claim
22 words
The controller of claim 54 , wherein the current command proportional integral control loop includes an exhaust gas temperature proportional integral control.
Claim 65
Dependent Claim
22 words
The controller of claim 54 , wherein the current command proportional integral control loop includes a lower bus voltage proportional integral control.
Claim 66
Dependent Claim
30 words
The controller of claim 54 , wherein the current command proportional integral control loop includes an exhaust gas temperature proportional integral control and a lower bus voltage proportional integral control.
Claim 67
Dependent Claim
27 words
The controller of claim 63 , wherein said lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 68
Dependent Claim
53 words
The controller of claim 52 , wherein the regulator includes a fuel command proportional integral control loop having a power proportional integral control and a speed proportional integral control, and a current command proportional integral control loop having an exhaust gas temperature proportional integral control and a lower bus voltage proportional integral control.
Claim 69
Dependent Claim
23 words
The controller of claim 65 , wherein the speed proportional integral control has a higher sampling time than said power proportional integral control.
Claim 70
Dependent Claim
47 words
The controller of claim 66 , wherein the fuel command proportional integral control loop additionally includes a minimum DC bus voltage proportional integral control and a selector to select the highest signal from said speed proportional integral control and said minimum DC bus voltage proportional integral control.
Claim 71
Dependent Claim
27 words
The controller of claim 65 , wherein the lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 72
Dependent Claim
44 words
The controller of claim 65 , wherein the speed proportional integral control has a higher sampling time than said power proportional integral control, and said lower bus voltage proportional integral control has a higher sampling time than said exhaust gas temperature proportional integral control.
Claim 73
Dependent Claim
25 words
The controller of claim 65 , wherein the power proportional integral control has a lower sampling time than said exhaust gas temperature proportional integral control.
Claim 74
Dependent Claim
25 words
The controller of claim 65 , wherein the exhaust gas temperature proportional integral control has a lower sampling time than said speed proportional integral control.
Claim 75
Dependent Claim
25 words
The controller of claim 65 , wherein the speed proportional integral control has a lower sampling time than said lower bus voltage proportional integral control.
Claim 76
Dependent Claim
62 words
The controller of claim 65 , wherein the power proportional integral control has a lower sampling time than said exhaust gas temperature proportional integral control, said exhaust gas temperature proportional integral control has a lower sampling time than said speed proportional integral control, and said speed proportional integral control has a lower sampling time than said lower bus voltage proportional integral control.
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