IN2014CN04628A - - Google Patents

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Publication number
IN2014CN04628A
IN2014CN04628A IN4628CHN2014A IN2014CN04628A IN 2014CN04628 A IN2014CN04628 A IN 2014CN04628A IN 4628CHN2014 A IN4628CHN2014 A IN 4628CHN2014A IN 2014CN04628 A IN2014CN04628 A IN 2014CN04628A
Authority
IN
India
Prior art keywords
hydraulic
operating mode
pump unit
speed operating
hydraulic motor
Prior art date
Application number
Other languages
English (en)
Inventor
Geoffrey Morgan Henderson
Peter John Scott
Matthew James Silvester
Richard James Trudgian
Original Assignee
Windflow Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windflow Technology Ltd filed Critical Windflow Technology Ltd
Publication of IN2014CN04628A publication Critical patent/IN2014CN04628A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F03D15/10—Transmission of mechanical power using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0276—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04—Automatic control; Regulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F16H47/04—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4096—Fluid exchange between hydrostatic circuits and external sources or consumers with pressure accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/47—Automatic regulation in accordance with output requirements for achieving a target output speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/403—Transmission of power through the shape of the drive components
    • F05B2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
    • F05B2260/40311—Transmission of power through the shape of the drive components as in toothed gearing of the epicyclic, planetary or differential type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/101—Purpose of the control system to control rotational speed (n)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/101—Purpose of the control system to control rotational speed (n)
    • F05B2270/1014—Purpose of the control system to control rotational speed (n) to keep rotational speed constant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/327—Rotor or generator speeds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Fluid Gearings (AREA)
  • Wind Motors (AREA)
IN4628CHN2014 2011-12-20 2012-12-11 IN2014CN04628A (sv)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161577941P 2011-12-20 2011-12-20
PCT/NZ2012/000233 WO2013095162A1 (en) 2011-12-20 2012-12-11 Power generating system and hydraulic control system

Publications (1)

Publication Number Publication Date
IN2014CN04628A true IN2014CN04628A (sv) 2015-09-18

Family

ID=48668888

Family Applications (1)

Application Number Title Priority Date Filing Date
IN4628CHN2014 IN2014CN04628A (sv) 2011-12-20 2012-12-11

Country Status (8)

Country Link
US (1) US9835140B2 (sv)
KR (1) KR102014567B1 (sv)
CN (1) CN104066977B (sv)
AU (1) AU2012354296B2 (sv)
GB (1) GB2512536B (sv)
IN (1) IN2014CN04628A (sv)
WO (1) WO2013095162A1 (sv)
ZA (1) ZA201404298B (sv)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH707887A1 (de) * 2013-04-12 2014-10-15 Liebherr Machines Bulle Sa Antriebssystem.
CN103498758B (zh) * 2013-09-17 2015-11-25 北京金风科创风电设备有限公司 液压偏航系统
US9841101B2 (en) * 2014-09-04 2017-12-12 Cummins Power Generation Ip, Inc. Control system for hydraulically powered AC generator
US10024305B2 (en) * 2015-11-10 2018-07-17 General Electric Company System and method for stabilizing a wind farm during one or more contingency events
US11384734B1 (en) * 2017-04-07 2022-07-12 Orville J. Birkestrand Wind turbine
US20190136835A1 (en) * 2017-11-01 2019-05-09 Accelerate Wind, LLC Wind turbine drivetrain system
MX2021008183A (es) 2019-01-08 2021-11-12 Prosto Wind Power Un sistema hidráulico de velocidad variable continua que tiene controles de velocidad neumática e hidráulica y un método de uso.
CN110345113A (zh) * 2019-08-13 2019-10-18 国电浙江北仑第一发电有限公司 一种电站旁路控制油增压系统
DE102019131980A1 (de) * 2019-11-26 2021-05-27 Moog Gmbh Elektrohydrostatisches System mit Drucksensor
CN113007019B (zh) * 2019-12-19 2022-10-18 新疆金风科技股份有限公司 控制器、控制系统以及风力发电机组
AU2021227962A1 (en) 2020-02-27 2022-08-18 Orville J. Birkestrand Toroidal lift force engine
US11698122B2 (en) * 2020-10-22 2023-07-11 Deere & Company Variable speed and reversible dual path fan drive system
CN113389859B (zh) * 2021-05-31 2023-04-25 浙江师范大学 一种风力发电机组预测型恒速箱系统及恒速控制方法
US12085095B2 (en) * 2021-09-30 2024-09-10 Todd Anthony Travis Wellhead pressure reduction and power generating assembly
CN114526197A (zh) * 2022-01-12 2022-05-24 浙江大学 风力发电机的液压混合动力控制系统和控制方法
CN115574443B (zh) * 2022-10-11 2024-07-19 珠海格力电器股份有限公司 一种空气调节设备及其控制方法、装置和存储介质

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601467A (en) 1977-07-08 1981-10-28 Energy Secretary Of State For Devices for extracting energy from wave power
US4239977A (en) 1978-09-27 1980-12-16 Lisa Strutman Surge-accepting accumulator transmission for windmills and the like
SE419113B (sv) * 1979-11-14 1981-07-13 Allmaenna Ingbyran Vindkraftverk for huvudsakligen mekanisk transmission av ett variabelt turbinvarvtal till ett synkront utgaende varvtal
SE8203944L (sv) 1982-06-24 1983-12-25 Svenska Varv Vindenenergi Ab Kopplingsanordning
US4774855A (en) 1982-08-17 1988-10-04 Vickers Shipbuilding And Engineering Limited Apparatus for providing an electrical generator with a constant rotational speed from a variable speed input
DE3471978D1 (en) 1983-03-23 1988-07-14 English Electric Co Ltd Power generating equipment
GB2225616A (en) * 1988-11-30 1990-06-06 Wind Energy Group Limited Power generating system including gearing allowing constant generator torque
NL1005735C1 (nl) * 1996-07-29 1998-02-05 Maud De Jong Regelbare Overbrenging.
JP3822100B2 (ja) 2001-12-21 2006-09-13 株式会社小松製作所 風力発電装置
CN100347445C (zh) * 2002-05-16 2007-11-07 Mlh环球有限公司 具有液压传动装置的风轮机
CN1273729C (zh) * 2002-11-13 2006-09-06 沈阳工业大学 兆瓦级风电机组变速、变距控制系统
DE10314757B3 (de) 2003-03-31 2004-11-11 Voith Turbo Gmbh & Co. Kg Antriebsstrang zum Übertragen einer variablen Leistung
GB0313345D0 (en) 2003-06-10 2003-07-16 Hicks R J Variable ratio gear
DE10361443B4 (de) * 2003-12-23 2005-11-10 Voith Turbo Gmbh & Co. Kg Regelung für eine Windkraftanlage mit hydrodynamischem Getriebe
AT504818A1 (de) 2004-07-30 2008-08-15 Windtec Consulting Gmbh Triebstrang einer windkraftanlage
DE102006040930A1 (de) 2006-08-31 2008-03-20 Nordex Energy Gmbh Verfahren zum Betrieb einer Windenergieanlage mit einem Synchrongenerator und einem Überlagerungsgetriebe
GB0711043D0 (en) * 2007-06-08 2007-07-18 Orbital 2 Ltd Variable radio transmission
EP2164790B1 (de) 2007-06-18 2015-09-30 Inventio AG Einrichtung und verfahren zum überwachen einer bremseinrichtung
FR2927394B1 (fr) 2008-02-11 2010-06-04 Roucar Gear Technologies Bv Dispositif de transmission pour machine de production d'electricite a partir d'une source motrice a vitesse variable, unite de production electrique et eolienne ainsi equipees, et procede de reglage d'un rapport de transmission
EP2107238A1 (en) 2008-03-31 2009-10-07 AMSC Windtec GmbH Variable ratio gear
EP2107237A1 (en) * 2008-03-31 2009-10-07 AMSC Windtec GmbH Wind energy converter comprising a superposition gear

Also Published As

Publication number Publication date
GB2512536B (en) 2018-05-30
ZA201404298B (en) 2016-02-24
US20150219077A1 (en) 2015-08-06
GB2512536A (en) 2014-10-01
CN104066977A (zh) 2014-09-24
KR102014567B1 (ko) 2019-10-21
US9835140B2 (en) 2017-12-05
AU2012354296A1 (en) 2014-07-03
KR20140120308A (ko) 2014-10-13
WO2013095162A1 (en) 2013-06-27
GB2512536A8 (en) 2014-10-15
CN104066977B (zh) 2016-12-21
NZ626075A (en) 2015-11-27
GB201412292D0 (en) 2014-08-27
AU2012354296B2 (en) 2017-04-13

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