US20060091674A1 - Quality power from induction generator feeding variable speed motors - Google Patents
Quality power from induction generator feeding variable speed motors Download PDFInfo
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- US20060091674A1 US20060091674A1 US10/982,628 US98262804A US2006091674A1 US 20060091674 A1 US20060091674 A1 US 20060091674A1 US 98262804 A US98262804 A US 98262804A US 2006091674 A1 US2006091674 A1 US 2006091674A1
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- power
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- bridge converter
- power factor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Definitions
- This invention relates to providing power to a utility power grid from an induction generator which also provides power to variable speed motor drives associated therewith, such as in combined heat and power systems; the power factor and harmonics content (shape) of the power at the grid interface is controlled to be well within requirements for power provided to the utility, by actively controlling power in a manner to complement and compensate for undesirable harmonics and power factor.
- auxiliary equipment such as pumps and fans.
- An example is a combined heat and power system which recovers waste heat, such as from food processing plants or landfills utilizing an organic Rankin cycle system as disclosed in publication US 2004/0088985A1.
- a compressible fluid has heat added and rejected at constant pressure along with isotropic expansion and compression, as is well known.
- the process may be organic, in which the working fluid changes states, or there may be a process in which a working fluid does not change states.
- a low cost generator provide power for all auxiliary equipment, while at the same time presenting power which has shape (without harmonic distortion), power factor and frequency that are all suitable for interface with the utility power grid.
- Synchronous generators are expensive and require additional controls compared with other, cheaper generators such as induction generators, in which the rotor consists of simple conductive bars, short-circuited at the ends, which is much less expensive than synchronous generators.
- induction generators have an inherently lower power factor than what is acceptable to utility grids.
- variable speed motors 11 , 12 are powered by insulated gate bipolar transistor (IGBT) switched bridge converters 13 , having switching controllers 14 , the DC input of which 15 is provided by three-phase diode rectifiers 16 , as is illustrated in FIG. 1 .
- IGBT insulated gate bipolar transistor
- a typical best case harmonic distortion of current at the utility grid 9 due to the auxiliary apparatus 11 - 16 , may be on the order of 32%. This amounts to about 8% distortion of the 200 kW being generated at the utility interface.
- Typical requirements of a power utility include harmonic distortion of less than 5%.
- harmonic filter traps 18 attached to the power bus 17 may be used, they will be application-specific, requiring tuning in each case—that is, in each application design. Apparatus on the grid 9 may interact with the filter traps 18 , so that the filter traps will be absorbing harmonic energy from the grid, thereby stressing the components above the intended rating. The filter traps may result in the power factor to be more lagging. Harmonic filter traps also increase the cost and space requirements of the installation where used.
- variable speed motors 11 , 12 driven by an induction generator causes the power factor to be very lagging, and thus lower than that typically required by a utility (ranging between 0.85 and 0.95).
- This may be corrected by large power factor correcting capacitors 20 , which increase the cost of the system, consume space, and are possible sources for self-excitation, all of which can be inappropriate in many installations.
- These capacitors may require additional bulky series inductors for limiting harmonic current to the capacitors.
- anti-islanding Another requirement for providing generated power to a utility power grid is referred to as “anti-islanding”, which requires that the power generator be disconnected from the grid whenever the voltage, frequency or power factor become out of certain limits. This may be accommodated by monitoring power factor, since any differences between the voltage or the phase of the generated power and that on the power utility grid will alter the power factor sufficiently to be detectable, and cause tripping of interconnection breakers.
- Objects of the invention include: producing quality power with a generator; producing quality electric power in a system having auxiliary variable speed motors associated with and powered by the generator, without degrading the quality of generated power which may be applied to a power utility grid; correction of power factor without the use of power factor correcting capacitors; producing well-shaped electric power with low harmonic distortion in a system employing an inexpensive induction generator associated with auxiliary variable speed motors; improved heat recovery; improved generation of electric power in an organic Rankin cycle heat recovery system; generating electrical power with low harmonic distortion, high power factor, and suitable anti-islanding in an organic Rankin cycle heat recovery system including variable speed induction motors as auxiliary equipment therein; and improved electric power generation having low harmonic distortion, high power factor and anti-islanding protection.
- an electric power generator which provides power to at least one related, auxiliary variable speed motor, as well as providing power to a power utility grid, employs an insulated gate bi-polar transistor (IGBT) switched bridge converter (SBC) to provide DC power input to at least one IGBT SBC which drives the variable speed motor.
- IGBT insulated gate bi-polar transistor
- SBC switched bridge converter
- FIG. 1 is a simplified schematic block diagram of an exemplary electric power generation system driven by a prime mover and powering variable speed motors with DC power from a diode bridge converter, as well as providing power to a power utility grid, known to the prior art.
- FIG. 2 is a simplified schematic block diagram of one example of the invention, which provides the IGBT switch bridge converters of the motors with DC power from an IGBT switch bridge converter instead of from a diode bridge converter.
- one known system utilizes three-phase diode rectifiers 16 to provide the DC voltage 15 at the input to the IGBT converters 13 .
- the converter controllers 14 respond to signals 21 , 22 from a system process controller 23 .
- the controller 23 responds to current and voltage signals 26 , 27 indicative of the power generated by the electric power generator 8 , including magnitude of power and power factor.
- the controller 23 also responds to signals 29 from whatever is the prime mover 28 , and provides controlling signals 30 to the prime mover.
- the prime mover may, for instance, be a heat recovery device, such as an organic Rankin cycle heat recovery device.
- the diode rectifiers draw current from the bus 17 in separated pulses of opposite phase, which equates to a highly distorted, semi-sine wave.
- Inductors 19 cause the current drawn by the rectifiers 16 to be more nearly sinusoidal, but not sufficiently to provide an acceptable waveshape on the bus 17 in order for power to be supplied to the grid 9 .
- the present invention accommodates all the aforementioned concerns with respect to harmonic distortion, power factor, and anti-islanding by means of an IGBT switched bridge converter (SBC) 13 a , the switching of which is controlled by an SBC controller 14 a .
- the SBC 13 a includes line inductors 35 which are required in order to control current and provide a boost function to the DC link 15 a .
- the system process controller 23 a responds to signals 27 indicative of current on the bus 17 and signals 26 indicative of voltage on the bus 17 .
- the invention may be used with any suitable prime mover driving the generator 8 .
- the system process controller 23 a will generate a commanded power setpoint, in accordance with the nature of the specific equipment, and or customer factors, etc.
- the system process controller will generate a commanded power factor correction, depending upon the power factor which is desired for power applied to the grid 9 , versus the power factor indicated by the voltage and current of power on the bus 17 .
- the commanded power factor correction may include a dither so that the actual power factor applied to the grid may be, for instance, between about 0.90 and 0.95. If the voltage, frequency or power factor indicated by the signals 26 , 27 goes above or below set limits, that is an indication that the generation system of the invention is islanding; this will cause breakers 10 to trip in a conventional fashion.
- Another method for preventing anti-islanding is to vary the real power used by parasitic (internal) loads.
- one of the loads in the system may be a sub sub-system of 20 fans powered from a controller.
- the real power used by the fans could be varied dynamically by 5 KW once each interval of between a fraction of a second and several seconds, preferably every two seconds. This would prevent the induction generator based system from becoming tuned to external loads, as the real and reactive power from the system will never be matched to any external load. Thus in case of a grid outage, the system will not “island”.
- the commands from the controller 23 a on lines 37 are developed in a fashion which causes the DC voltage 15 a to be developed while providing a proper, well-shaped sine wave on the bus 17 which is in phase with the grid 9 .
- the system process controller tells the SBC controllers what power and power factor to operate at; the SBC controllers then run the SBCs.
- the breaker 10 will open when there is a fault on the system, or if the dithering of the power factor causes either voltage, frequency or power factor to become out of a certain range. Excitation of the induction generator stator requires volt/ampere reactive power support from either the utility grid or the volt/ampere reactive power sources within the system of FIG. 2 .
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
- This invention relates to providing power to a utility power grid from an induction generator which also provides power to variable speed motor drives associated therewith, such as in combined heat and power systems; the power factor and harmonics content (shape) of the power at the grid interface is controlled to be well within requirements for power provided to the utility, by actively controlling power in a manner to complement and compensate for undesirable harmonics and power factor.
- It has become common for entities other than power utilities to generate electric power and to provide it to the utility grid, thereby to derive revenue or offset customer electric utility bills. Recapture and utilization of energy (such as heat) which would otherwise be wasted, as a byproduct of some useful function, is becoming commonplace.
- In some electric power generating systems, the manner of harnessing the energy that will operate the generator may require auxiliary equipment, such as pumps and fans. An example is a combined heat and power system which recovers waste heat, such as from food processing plants or landfills utilizing an organic Rankin cycle system as disclosed in publication US 2004/0088985A1. In such a system, a compressible fluid has heat added and rejected at constant pressure along with isotropic expansion and compression, as is well known. The process may be organic, in which the working fluid changes states, or there may be a process in which a working fluid does not change states.
- For economic efficiency, it is desirable that a low cost generator provide power for all auxiliary equipment, while at the same time presenting power which has shape (without harmonic distortion), power factor and frequency that are all suitable for interface with the utility power grid. Synchronous generators are expensive and require additional controls compared with other, cheaper generators such as induction generators, in which the rotor consists of simple conductive bars, short-circuited at the ends, which is much less expensive than synchronous generators. However, induction generators have an inherently lower power factor than what is acceptable to utility grids.
- As a specific example of harmonic distortion, consider an
electric power generator 8, shown inFIG. 1 , which produces 270 kW, connected to agrid 9 bybreakers 10 and to auxiliaryvariable speed motors grid 9 is 200 kW. Thevariable speed motors bridge converters 13, havingswitching controllers 14, the DC input of which 15 is provided by three-phase diode rectifiers 16, as is illustrated inFIG. 1 . - A typical best case harmonic distortion of current at the
utility grid 9, due to the auxiliary apparatus 11-16, may be on the order of 32%. This amounts to about 8% distortion of the 200 kW being generated at the utility interface. Typical requirements of a power utility include harmonic distortion of less than 5%. Althoughharmonic filter traps 18 attached to thepower bus 17 may be used, they will be application-specific, requiring tuning in each case—that is, in each application design. Apparatus on thegrid 9 may interact with thefilter traps 18, so that the filter traps will be absorbing harmonic energy from the grid, thereby stressing the components above the intended rating. The filter traps may result in the power factor to be more lagging. Harmonic filter traps also increase the cost and space requirements of the installation where used. - The use of
variable speed motors factor correcting capacitors 20, which increase the cost of the system, consume space, and are possible sources for self-excitation, all of which can be inappropriate in many installations. These capacitors may require additional bulky series inductors for limiting harmonic current to the capacitors. - Another requirement for providing generated power to a utility power grid is referred to as “anti-islanding”, which requires that the power generator be disconnected from the grid whenever the voltage, frequency or power factor become out of certain limits. This may be accommodated by monitoring power factor, since any differences between the voltage or the phase of the generated power and that on the power utility grid will alter the power factor sufficiently to be detectable, and cause tripping of interconnection breakers.
- Objects of the invention include: producing quality power with a generator; producing quality electric power in a system having auxiliary variable speed motors associated with and powered by the generator, without degrading the quality of generated power which may be applied to a power utility grid; correction of power factor without the use of power factor correcting capacitors; producing well-shaped electric power with low harmonic distortion in a system employing an inexpensive induction generator associated with auxiliary variable speed motors; improved heat recovery; improved generation of electric power in an organic Rankin cycle heat recovery system; generating electrical power with low harmonic distortion, high power factor, and suitable anti-islanding in an organic Rankin cycle heat recovery system including variable speed induction motors as auxiliary equipment therein; and improved electric power generation having low harmonic distortion, high power factor and anti-islanding protection.
- According to the present invention, an electric power generator which provides power to at least one related, auxiliary variable speed motor, as well as providing power to a power utility grid, employs an insulated gate bi-polar transistor (IGBT) switched bridge converter (SBC) to provide DC power input to at least one IGBT SBC which drives the variable speed motor.
- Other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of exemplary embodiments thereof, as illustrated in the accompanying drawing.
-
FIG. 1 is a simplified schematic block diagram of an exemplary electric power generation system driven by a prime mover and powering variable speed motors with DC power from a diode bridge converter, as well as providing power to a power utility grid, known to the prior art. -
FIG. 2 is a simplified schematic block diagram of one example of the invention, which provides the IGBT switch bridge converters of the motors with DC power from an IGBT switch bridge converter instead of from a diode bridge converter. - Referring to
FIG. 1 , one known system utilizes three-phase diode rectifiers 16 to provide theDC voltage 15 at the input to theIGBT converters 13. Theconverter controllers 14 respond tosignals system process controller 23. Thecontroller 23 responds to current andvoltage signals electric power generator 8, including magnitude of power and power factor. Thecontroller 23 also responds tosignals 29 from whatever is theprime mover 28, and provides controllingsignals 30 to the prime mover. The prime mover may, for instance, be a heat recovery device, such as an organic Rankin cycle heat recovery device. - The diode rectifiers draw current from the
bus 17 in separated pulses of opposite phase, which equates to a highly distorted, semi-sine wave.Inductors 19 cause the current drawn by therectifiers 16 to be more nearly sinusoidal, but not sufficiently to provide an acceptable waveshape on thebus 17 in order for power to be supplied to thegrid 9. - Referring to
FIG. 2 , the present invention accommodates all the aforementioned concerns with respect to harmonic distortion, power factor, and anti-islanding by means of an IGBT switched bridge converter (SBC) 13 a, the switching of which is controlled by anSBC controller 14 a. The SBC 13 a includesline inductors 35 which are required in order to control current and provide a boost function to theDC link 15 a. InFIG. 2 , thesystem process controller 23 a responds to signals 27 indicative of current on thebus 17 and signals 26 indicative of voltage on thebus 17. The invention may be used with any suitable prime mover driving thegenerator 8. - The general algorithms are well known and widely published. In accordance with the invention, these algorithms may be tailored in a known fashion in order to achieve the results which are specifically desired when employing the invention.
- The
system process controller 23 a will generate a commanded power setpoint, in accordance with the nature of the specific equipment, and or customer factors, etc. In addition, the system process controller will generate a commanded power factor correction, depending upon the power factor which is desired for power applied to thegrid 9, versus the power factor indicated by the voltage and current of power on thebus 17. In addition, the commanded power factor correction may include a dither so that the actual power factor applied to the grid may be, for instance, between about 0.90 and 0.95. If the voltage, frequency or power factor indicated by thesignals breakers 10 to trip in a conventional fashion. - Another method for preventing anti-islanding is to vary the real power used by parasitic (internal) loads. For example, one of the loads in the system (such as
motors 11, 12) may be a sub sub-system of 20 fans powered from a controller. The real power used by the fans could be varied dynamically by 5 KW once each interval of between a fraction of a second and several seconds, preferably every two seconds. This would prevent the induction generator based system from becoming tuned to external loads, as the real and reactive power from the system will never be matched to any external load. Thus in case of a grid outage, the system will not “island”. - The commands from the
controller 23 a onlines 37 are developed in a fashion which causes theDC voltage 15 a to be developed while providing a proper, well-shaped sine wave on thebus 17 which is in phase with thegrid 9. The system process controller tells the SBC controllers what power and power factor to operate at; the SBC controllers then run the SBCs. Thebreaker 10 will open when there is a fault on the system, or if the dithering of the power factor causes either voltage, frequency or power factor to become out of a certain range. Excitation of the induction generator stator requires volt/ampere reactive power support from either the utility grid or the volt/ampere reactive power sources within the system ofFIG. 2 . - The aforementioned publication is incorporated herein by reference.
- Thus, although the invention has been shown and described with respect to exemplary embodiments thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions and additions may be made therein and thereto, without departing from the spirit and scope of the invention.
Claims (6)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/982,628 US7038329B1 (en) | 2004-11-04 | 2004-11-04 | Quality power from induction generator feeding variable speed motors |
PCT/US2005/037689 WO2006052410A1 (en) | 2004-11-04 | 2005-10-21 | Quality power from induction generator feeding variable speed motors |
CN2005800381657A CN101057390B (en) | 2004-11-04 | 2005-10-21 | System and method for generating and utilizing electric power |
KR1020077009443A KR20070073816A (en) | 2004-11-04 | 2005-10-21 | Quality power from induction generator feeding variable speed motors |
JP2007540333A JP4691561B2 (en) | 2004-11-04 | 2005-10-21 | High quality power from induction generators feeding variable speed motors |
EP20050817031 EP1820261A1 (en) | 2004-11-04 | 2005-10-21 | Quality power from induction generator feeding variable speed motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/982,628 US7038329B1 (en) | 2004-11-04 | 2004-11-04 | Quality power from induction generator feeding variable speed motors |
Publications (2)
Publication Number | Publication Date |
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US7038329B1 US7038329B1 (en) | 2006-05-02 |
US20060091674A1 true US20060091674A1 (en) | 2006-05-04 |
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ID=36216040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/982,628 Expired - Fee Related US7038329B1 (en) | 2004-11-04 | 2004-11-04 | Quality power from induction generator feeding variable speed motors |
Country Status (6)
Country | Link |
---|---|
US (1) | US7038329B1 (en) |
EP (1) | EP1820261A1 (en) |
JP (1) | JP4691561B2 (en) |
KR (1) | KR20070073816A (en) |
CN (1) | CN101057390B (en) |
WO (1) | WO2006052410A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100002475A1 (en) * | 2008-07-01 | 2010-01-07 | American Superconductor Corporation | Low voltage ride through |
US20120286512A1 (en) * | 2010-12-21 | 2012-11-15 | Ge Energy Products France Snc | Electricity production system |
US9525285B2 (en) | 2011-06-13 | 2016-12-20 | Demand Energy Networks, Inc. | Energy systems and energy supply methods |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7202638B2 (en) * | 2004-10-15 | 2007-04-10 | General Electric Company | Anti-islanding protection systems for synchronous machine based distributed generators |
JP4575272B2 (en) * | 2005-10-27 | 2010-11-04 | 株式会社日立製作所 | Distributed power system and system stabilization method |
US7253537B2 (en) * | 2005-12-08 | 2007-08-07 | General Electric Company | System and method of operating double fed induction generators |
CN100452273C (en) * | 2007-01-19 | 2009-01-14 | 福州大学 | Fast electromotor driving low-voltage breaker |
CA2694678C (en) * | 2007-07-27 | 2014-09-16 | Utc Power Corporation | Oil removal from a turbine of an organic rankine cycle (orc) system |
CA2694682C (en) * | 2007-07-27 | 2014-12-02 | Utc Power Corporation | Oil recovery from an evaporator of an organic rankine cycle (orc) system |
US8258761B2 (en) * | 2007-07-31 | 2012-09-04 | Battelle Memorial Institute | Electrical energy consumption control apparatuses and electrical energy consumption control methods |
EP2212524A4 (en) * | 2007-10-04 | 2012-04-18 | United Technologies Corp | Cascaded organic rankine cycle (orc) system using waste heat from a reciprocating engine |
EP2235332A4 (en) * | 2007-12-21 | 2014-01-22 | United Technologies Corp | Operating a sub-sea organic rankine cycle (orc) system using individual pressure vessels |
EP2232666B1 (en) * | 2007-12-24 | 2020-05-06 | United Technologies Corporation | Harmonic filter with integrated power factor correction |
AU2010310516B2 (en) * | 2009-10-25 | 2016-07-07 | Abb Research Ltd | Method and apparatus for improving the operation of an auxiliary power system of a thermal power plant |
CN102918734B (en) * | 2010-01-22 | 2016-08-03 | Abb公司 | For the method and apparatus improving the generating in steam power plant |
EP2935843B1 (en) * | 2012-12-20 | 2021-07-21 | Wärtsilä Finland Oy | A control system of an internal combustion engine |
JP2016103968A (en) | 2014-10-21 | 2016-06-02 | ゼネラル・エレクトリック・カンパニイ | Induction generator system with grid-loss ride-through capability |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US511376A (en) * | 1893-12-26 | Electric measuring-instrument | ||
US3727103A (en) * | 1972-06-30 | 1973-04-10 | Gen Electric | Three phase system monitoring and control circuit |
US4461986A (en) * | 1983-04-20 | 1984-07-24 | Westinghouse Electric Corp. | Motor control apparatus with phase related detector |
US5373196A (en) * | 1992-10-16 | 1994-12-13 | Vanner Weldon Inc. | Combination static/dynamic inverter |
US5585708A (en) * | 1991-02-22 | 1996-12-17 | Kenetech Windpower, Inc. | Four quadrant motor controller minimizing distortion index |
US6219623B1 (en) * | 1997-11-24 | 2001-04-17 | Plug Power, Inc. | Anti-islanding method and apparatus for distributed power generation |
US6386719B1 (en) * | 2001-03-14 | 2002-05-14 | Enroute, Inc. | Precision mounting of front surface mirrors |
US20040264082A1 (en) * | 2003-06-26 | 2004-12-30 | Suliman Alaadin M. | Method and apparatus for capture of grid characteristics corresponding to fluctuation events |
US20050122082A1 (en) * | 2003-12-03 | 2005-06-09 | Siemens Aktiengesellschaft | Drive system |
US20050253551A1 (en) * | 2004-05-12 | 2005-11-17 | Walter Koellner | System for powering mining equipment |
US20050276020A1 (en) * | 2004-05-27 | 2005-12-15 | Ahmad Raed H | System and method for a cooling system |
US6979914B2 (en) * | 2003-02-20 | 2005-12-27 | Ebara Corporation | Power generating apparatus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3008478A1 (en) * | 1979-05-30 | 1980-12-11 | Sundstrand Corp | CONTROL ARRANGEMENT AND METHOD FOR ELECTRIC GENERATOR AND DISTRIBUTION SYSTEM |
DE3333631A1 (en) * | 1983-09-17 | 1985-04-18 | Braun Ag, 6000 Frankfurt | Circuit arrangement for supplying an oscillating-armature motor |
JP3682544B2 (en) * | 1998-07-16 | 2005-08-10 | 株式会社日立製作所 | Plant power rate control system using inverter drive device |
CN2481039Y (en) * | 2001-05-25 | 2002-03-06 | 成都希望电子研究所 | Electricity converter capable of raising utilization coefficient of wind generated energy |
JP2003174727A (en) * | 2001-12-06 | 2003-06-20 | Mitsubishi Electric Corp | Power supply method and power system connection system |
-
2004
- 2004-11-04 US US10/982,628 patent/US7038329B1/en not_active Expired - Fee Related
-
2005
- 2005-10-21 CN CN2005800381657A patent/CN101057390B/en not_active Expired - Fee Related
- 2005-10-21 WO PCT/US2005/037689 patent/WO2006052410A1/en active Application Filing
- 2005-10-21 EP EP20050817031 patent/EP1820261A1/en not_active Withdrawn
- 2005-10-21 KR KR1020077009443A patent/KR20070073816A/en not_active Application Discontinuation
- 2005-10-21 JP JP2007540333A patent/JP4691561B2/en not_active Expired - Fee Related
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US511376A (en) * | 1893-12-26 | Electric measuring-instrument | ||
US3727103A (en) * | 1972-06-30 | 1973-04-10 | Gen Electric | Three phase system monitoring and control circuit |
US4461986A (en) * | 1983-04-20 | 1984-07-24 | Westinghouse Electric Corp. | Motor control apparatus with phase related detector |
US5585708A (en) * | 1991-02-22 | 1996-12-17 | Kenetech Windpower, Inc. | Four quadrant motor controller minimizing distortion index |
US5373196A (en) * | 1992-10-16 | 1994-12-13 | Vanner Weldon Inc. | Combination static/dynamic inverter |
US6219623B1 (en) * | 1997-11-24 | 2001-04-17 | Plug Power, Inc. | Anti-islanding method and apparatus for distributed power generation |
US6386719B1 (en) * | 2001-03-14 | 2002-05-14 | Enroute, Inc. | Precision mounting of front surface mirrors |
US6979914B2 (en) * | 2003-02-20 | 2005-12-27 | Ebara Corporation | Power generating apparatus |
US20040264082A1 (en) * | 2003-06-26 | 2004-12-30 | Suliman Alaadin M. | Method and apparatus for capture of grid characteristics corresponding to fluctuation events |
US20050122082A1 (en) * | 2003-12-03 | 2005-06-09 | Siemens Aktiengesellschaft | Drive system |
US20050253551A1 (en) * | 2004-05-12 | 2005-11-17 | Walter Koellner | System for powering mining equipment |
US20050276020A1 (en) * | 2004-05-27 | 2005-12-15 | Ahmad Raed H | System and method for a cooling system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100002475A1 (en) * | 2008-07-01 | 2010-01-07 | American Superconductor Corporation | Low voltage ride through |
US8120932B2 (en) * | 2008-07-01 | 2012-02-21 | American Superconductor Corporation | Low voltage ride through |
US20120286512A1 (en) * | 2010-12-21 | 2012-11-15 | Ge Energy Products France Snc | Electricity production system |
US9525285B2 (en) | 2011-06-13 | 2016-12-20 | Demand Energy Networks, Inc. | Energy systems and energy supply methods |
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WO2006052410A1 (en) | 2006-05-18 |
EP1820261A1 (en) | 2007-08-22 |
KR20070073816A (en) | 2007-07-10 |
US7038329B1 (en) | 2006-05-02 |
JP2008519582A (en) | 2008-06-05 |
CN101057390A (en) | 2007-10-17 |
JP4691561B2 (en) | 2011-06-01 |
CN101057390B (en) | 2010-05-05 |
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