GB1600243A - Wind power - Google Patents

Wind power Download PDF

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Publication number
GB1600243A
GB1600243A GB23814/77A GB2381477A GB1600243A GB 1600243 A GB1600243 A GB 1600243A GB 23814/77 A GB23814/77 A GB 23814/77A GB 2381477 A GB2381477 A GB 2381477A GB 1600243 A GB1600243 A GB 1600243A
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GB
United Kingdom
Prior art keywords
generator
wind
speed
wind wheel
wheel
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB23814/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAWSON TANCRED H
Original Assignee
LAWSON TANCRED H
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 LAWSON TANCRED H filed Critical LAWSON TANCRED H
Priority to GB23814/77A priority Critical patent/GB1600243A/en
Publication of GB1600243A publication Critical patent/GB1600243A/en
Expired legal-status Critical Current

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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
    • 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
    • F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
    • 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
    • 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
    • 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
    • F03D9/28—Wind motors characterised by the driven apparatus the apparatus being a pump or a compressor
    • 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
    • F05B2260/406—Transmission of power through hydraulic systems
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Wind Motors (AREA)

Description

(54) WIND POWER (71) I, SIR, HENRY LAWSON-TANCRED, Baronet, of Aldborough Manor, Boroughbridge, Yorkshire, a British subject, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to methods of operating a wind wheel for taking power from the wind, and especially to the production of electricity thereby.
Fixed pitch wind wheels are simpler and less expensive than variable pitch wheels, and have less opportunity to break down.
However, a fixed pitch wheel connected to drive an electric generator in a conventional way is only operable efficiently over a narrow range of wind speeds, and is not operable at all when the wind speed is very different from that for which the arrangement is designed-usually average wind speed for the locality.
Another problem in the production of electricity from wind wheels is the question of what to do with the electricity produced. It is of course possible to store it in electric accumulators, but this is expensive and relatively inefficient. Furthermore, the rate of production of electricity is not constant, nor is the rate of rotation of the wind wheel, so that a constant frequency cannot be produced directly.
The present invention solves the first of these problems, and makes possible an economic solution to the second.
The invention comprises a method for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by driving intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and said intermediate means applying all of said power to drive means generating electricy at constant frequency independent of the wind speed.
Said constant frequency may of course be mains frequency.
The invention also comprises a method for generating electricity from wind in which a fixed pitch wind wheel is hydraulically connected to drive a generator at a fixed rotational speed, said wind wheel being operated at constant tip speed ratio (and therefore at a varying rotational speed depending on the wind speed) by driving hydraulic pump means controlled to effect a torque reaction on the wheel at least roughly proportional to the square of the rotational speed of the wind wheel said pump means supplying variable hydraulic motor means driving said generator, the adjustment of said motor means being such as to maintain constant hydraulic pressure in the system while driving said generator at said fixed speed.
In this way, a wind wheel can be operated at fixed blade pitch so that its blade tip speed is always proportional to the wind speed.
The wind wheel may drive hydraulic pump means, which may be of a type having continuously variable torque characteristics, such as a variable angle swash plate pump.
The swash plate angle will then be controlled by a wind wheel speed sensing arrangement.
The hydraulic pump means may, however, have stepwise variable torque characteristics, and may, for example, comprise a plurality of gear pumps (a gear pump has a torque proportional to speed) and bypasses operable by a wind wheel speed sensing arrangement so that at low wind speeds only one pump is on torque, and at higher wind speed others of the pumps are on torque as well.
Since the electric generator is connected to and rotates in synchronism with the mains supply, energy from the energy converted is fed to drive the generator at such speed at whatever power is being produced from the wind wheel. Thus a large wind wheel, or a wind wheel "farm", can be used to generate power for the national grid, or a small domestic wheel can be used to feed energy produced in excess of local demand back into the mains, driving the meter backwards. This eliminates the problem of storage. Whenever there is an excess of local demand over local supply, the difference is made up from the mains supply. Only this difference registers on the meter.
However, the energy converter itself may comprise electric generator means operating at variable speed depending on wind wheel rotational speed, the torque of said generator means being arranged to be proportional to the rotational speed of the wind wheel. The output of said generator means can then be inverted (if d.c.) or converted (if a.c.) to mains frequency, as by a motor-generator set or by a static invertor or static converter.
The invention also comprises apparatus for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by being connected to drive intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and being connected to drive a generator at synchronous speed.
Said intermediate means may be adapted for direct connection to the wind wheel or for connection via fixed ratio gearing.
Methods and apparatus for operating and producing electricity from a wind wheel according to the invention will now be described with reference to the accompanying drawings in which: Figure 1 is a schematic diagram of a first embodiment of apparatus, Figure 2 is a schematic diagram of a second embodiment, Figure 3 is a schematic diagram of a third embodiment, Figure 4 is a schematic diagram of a fourth embodiment, and Figure 5 is a schematic diagram of a fifth embodiment.
The Figures illustrate methods of operating wind wheels 11 for taking power from the wind over a range of wind speeds in which the wind wheel 11 is connected to drive an energy converter 12 that effects a torque reaction on the on the wheel 11 at least roughly proportional to the square of the rotational speed of the wind wheel 11.
The wind wheels 11 can be fixed pitch wheels, since variable pitch is not required.
However, variable pitch wheels can of course be used operated at a selected, fixed pitch.
Figures 1 to 3 show the wind wheel 11 driving hydraulic pump means 13. Figures 1 and 2 show the pump means 13 as a variable angle swash plate pump. The wind wheel 11 drives the pump 13 via fixed ratio gearing 14.
The swash plate angle controller 15 is actuated by a control arrangement 16 in accordance with a signal from a shaft speed transducer 17.
The hydraulic fluid output of the pump 13 is fed to an hydraulic motor 18 which drives a mains synchronous generator 19. The motor 18 is a variable angle swash plate motor whose swash plate angle controller 1 8a is operated by a control arrangement 21 that acts to maintain a constant hydraulic pressure in the circuit.
As the wind wheel 11 rotates faster at higher wind speeds, the control arrangement 16 increases the swash plate angle to increase the torque loading on the wind wheel and keep its tip speed proportions to wind speed.
This delivers more hydraulic fluid to the motor 18. The swash plate angle ofthe motor 18 is increased by the control arrangement 21 so that the motor accepts the increased output of hydraulic fluid at constant pressure, and increases its power output to the generator. The generator, being synchronised with the mains supply, constrains the motor 18 to run at constant speed.
Spent hydraulic fluid is returned to a header tank 22 supplying the pump 13.
Figure 2 shows a similar arrangement in which the control arrangement 21 comprises an hydraulic accumulator comprising a piston 23 operating in a cylinder 24. The piston 23 is loaded with a weight 23a that determines the pressure in the system. As more fluid is output from the pump 13, the piston rises in the cylinder and operates the swash plate controller 18a via a potentiometer 25, so that the swash plate angle is increased and the motor 18 accepts fluid at a higher throughput rate so as to stabilise the level of the piston 23.
Figure 3 shows another arrangement in which the pump means 13 comprise four gear pumps 13a, 13b, 13c, 13d. The pumps are all connected to be rotated all the time at the output shaft speed of the gearing 14.
However, bypass means, not shown, are operated in accordance with shaft speed (sensed by transducer 17) so that at low speeds only pump 13a is on torque, and at progressively higher speeds, pumps 13b, 13c and 13d are brought on torque.
Figure 3 also shows an arrangement in which a second generator 31 can be brought in a higher wind speeds. The second generator need not be synchronous, and may be connected to a purely resistive load for domestic heating purposes-perhaps for storing heat in a large heat sink to be pumped out later on. This may be useful particularly where the system is to be used in country areas where the mains network could not accept large power inputs. The generator 19 might typically be a 5KW generator, and the generator 31 a 25 or 30KW generator. The larger generator may be cut in on a signal that the smaller generator is already running at maximum power output, or that the swash plate of the motor 18 is already at its maximum permitted angle.
Figures 4 and 5 show arrangements in which hydraulic energy converters are not used. The same torque characteristics are, however, provided in generator means 41 connected to be driven directly (through fixed ratio gearing 42) from the wind wheel 11. The desired speedHiependent torque characteristics can be provided either in a stepwise fashion, by having, say, four identical generators which are brought successively on load as shaft speed increases, or by a single generator which, by switching in coils or groups of coils has a more nearly continuously variable torque characteristic.
Figure 4 shows such an arrangement driving a motor generator set 43 connected to run synchronously with the mains supply.
Figure 5 shows the generator means 41-which can be either an a.c. generator or a d.c. generatoronnected to a static converter or inverter 44 respectively controlled to produce mains-synchronous alternating current.
All these arrangements enable fixed pitch wind wheels to operate and produce electricity efficiently over a wide range of wind speeds, and to produce electricity, moreover, that can be "stored" in the mains network without the use of complicated phase angle matching arrangements.
Moreover, two or more wind wheels can be joined to the same hydraulic or other energy conversion arrangements if desired.
WHAT I CLAIM IS: 1. A method for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by driving intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and said intermediate means applying all of said power to drive a generator means generating electricity at constant frequency independent of the wind speed.
2. A method according to claim 1, wherein said constant frequency is mains frequency.
3. A method for generating electricity from wind in which a fixed pitch wind wheel is hydraulically connected to drive a generator at a fixed rotational speed, said wind wheel being operated at constant top speed ratio (and therefore at a varying rotational speed depending on the wind speed) by driving hydraulic pump means controlled to effect a torque reaction on the wheel at least roughly proportional to the square of the rotational speed of the wind wheel said pump means supplying variable hydraulic motor means driving said generator, the adjustment of said motor means being such as to maintain constant hydraulic pressure in the system while driving said generator at said fixed speed.
4. A method according to claim 3, said fixed speed being mains synchronous speed and said generator being connected to the mains supply.
5. A method according to claim 3 or claim 4, in which said hydraulic pump means have continuously variable torque characteristics.
6. A method according to claim 3 or claim 4, in which said hydraulic pump means have stepwise variable torque characteristics.
7. A method according to any one of claims 3 to 6, in which the torque characteristics of said pump means are controlled by a wind wheel rotational speed sensing arrangement.
8. A method according to any one of claims 3 to 7, in which said motor means have continuously variable torque characteristics.
9. A method for generating electricity from wind substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
10. Apparatus for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by being connected to drive intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and being connected to drive means generating electricity at constant frequency independent of the wind speed.
11. Apparatus for generating electricity from a fixed pitch wind wheel comprising hydraulic pump means adapted to be driven by said wind wheel and to be controlled in accordance with the wind wheels rotational speed to effect a torque reaction on said wind wheel proportional to the square of such speed and variable hydraulic motor means supplied by said pump means and driving an electric generator, and control means for said motor to vary the torque characteristics thereof so as to maintain a constant hydraulic pressure while driving said generator at a fixed speed.
12. Apparatus according to claim 11,
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    particularly where the system is to be used in country areas where the mains network could not accept large power inputs. The generator 19 might typically be a 5KW generator, and the generator 31 a 25 or 30KW generator. The larger generator may be cut in on a signal that the smaller generator is already running at maximum power output, or that the swash plate of the motor 18 is already at its maximum permitted angle.
    Figures 4 and 5 show arrangements in which hydraulic energy converters are not used. The same torque characteristics are, however, provided in generator means 41 connected to be driven directly (through fixed ratio gearing 42) from the wind wheel 11. The desired speedHiependent torque characteristics can be provided either in a stepwise fashion, by having, say, four identical generators which are brought successively on load as shaft speed increases, or by a single generator which, by switching in coils or groups of coils has a more nearly continuously variable torque characteristic.
    Figure 4 shows such an arrangement driving a motor generator set 43 connected to run synchronously with the mains supply.
    Figure 5 shows the generator means 41-which can be either an a.c. generator or a d.c. generatoronnected to a static converter or inverter 44 respectively controlled to produce mains-synchronous alternating current.
    All these arrangements enable fixed pitch wind wheels to operate and produce electricity efficiently over a wide range of wind speeds, and to produce electricity, moreover, that can be "stored" in the mains network without the use of complicated phase angle matching arrangements.
    Moreover, two or more wind wheels can be joined to the same hydraulic or other energy conversion arrangements if desired.
    WHAT I CLAIM IS:
    1. A method for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by driving intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and said intermediate means applying all of said power to drive a generator means generating electricity at constant frequency independent of the wind speed.
    2. A method according to claim 1, wherein said constant frequency is mains frequency.
    3. A method for generating electricity from wind in which a fixed pitch wind wheel is hydraulically connected to drive a generator at a fixed rotational speed, said wind wheel being operated at constant top speed ratio (and therefore at a varying rotational speed depending on the wind speed) by driving hydraulic pump means controlled to effect a torque reaction on the wheel at least roughly proportional to the square of the rotational speed of the wind wheel said pump means supplying variable hydraulic motor means driving said generator, the adjustment of said motor means being such as to maintain constant hydraulic pressure in the system while driving said generator at said fixed speed.
    4. A method according to claim 3, said fixed speed being mains synchronous speed and said generator being connected to the mains supply.
    5. A method according to claim 3 or claim 4, in which said hydraulic pump means have continuously variable torque characteristics.
    6. A method according to claim 3 or claim 4, in which said hydraulic pump means have stepwise variable torque characteristics.
    7. A method according to any one of claims 3 to 6, in which the torque characteristics of said pump means are controlled by a wind wheel rotational speed sensing arrangement.
    8. A method according to any one of claims 3 to 7, in which said motor means have continuously variable torque characteristics.
    9. A method for generating electricity from wind substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
    10. Apparatus for generating electricity from wind in which a fixed pitch wind wheel is operated at constant tip speed ratio by being connected to drive intermediate means effecting a torque reaction on said wheel proportional to the square of the rotational speed of the wheel said intermediate means thereby extracting power from said wind wheel proportional to the cube of said rotational speed and being connected to drive means generating electricity at constant frequency independent of the wind speed.
    11. Apparatus for generating electricity from a fixed pitch wind wheel comprising hydraulic pump means adapted to be driven by said wind wheel and to be controlled in accordance with the wind wheels rotational speed to effect a torque reaction on said wind wheel proportional to the square of such speed and variable hydraulic motor means supplied by said pump means and driving an electric generator, and control means for said motor to vary the torque characteristics thereof so as to maintain a constant hydraulic pressure while driving said generator at a fixed speed.
    12. Apparatus according to claim 11,
    said generator being a mains-synchronous generator.
    13. Apparatus according to claim 11 or claim 12 said pump means having continuously variable torque characteristics.
    14. Apparatus according to claim 12, said pump means comprising a variable angle swash plate pump.
    15. Apparatus according to claim 11, said pump means having stepwise variable torque characteristics.
    16. Apparatus according to claim 13, in which said pump means comprise a plurality of gear pumps and bypasses operable by a wind wheel rotational speed sensing arrangement so that at low speeds only one pump is on torque and at higher speeds others of the pumps are on torque as well.
    17. Apparatus according to any one of claims 11 to 16, in which said motor is a variable angle swash plate motor.
    18. Apparatus according to any one of claims 11 to 17, in which said control means comprise means connected to a motor adjustment device adapted to adjust the motor to accept a higher flow at constant pressure when the flow from the said pump means increases, and a lower flow at constant pressure when the flow from the said pump means decreases whereby to vary the power output of said generator but not the speed thereof in accordance with variations in the rotational speed of the wind wheel.
    19. Apparatus according to claim 10, said intermediate means comprising electric generator means driven at variable speed by the wind wheel, and comprising further converter or inverter means for converting or inverting the output of said generator means to mains frequency.
    20. Apparatus according to claim 19, in which said converter or inverter means comprise a static converter or a static inverter.
    22. Apparatus for generating electricity from a fixed pitch wind wheel substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB23814/77A 1978-05-31 1978-05-31 Wind power Expired GB1600243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB23814/77A GB1600243A (en) 1978-05-31 1978-05-31 Wind power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23814/77A GB1600243A (en) 1978-05-31 1978-05-31 Wind power

Publications (1)

Publication Number Publication Date
GB1600243A true GB1600243A (en) 1981-10-14

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GB23814/77A Expired GB1600243A (en) 1978-05-31 1978-05-31 Wind power

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215571A1 (en) * 1982-04-27 1983-11-03 Dornier System Gmbh, 7990 Friedrichshafen Method and apparatus for improving the operating characteristics of a wind energy converter and of working machine(s) connected thereto
US7352076B1 (en) * 2006-08-11 2008-04-01 Mariah Power Inc. Small wind turbine system
RU2499912C1 (en) * 2012-05-22 2013-11-27 Александр Юрьевич Онин Wind-driven power plant with hydraulic drive

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215571A1 (en) * 1982-04-27 1983-11-03 Dornier System Gmbh, 7990 Friedrichshafen Method and apparatus for improving the operating characteristics of a wind energy converter and of working machine(s) connected thereto
US7352076B1 (en) * 2006-08-11 2008-04-01 Mariah Power Inc. Small wind turbine system
RU2499912C1 (en) * 2012-05-22 2013-11-27 Александр Юрьевич Онин Wind-driven power plant with hydraulic drive
WO2013176569A1 (en) * 2012-05-22 2013-11-28 Onin Aleksandr Yur Evich Wind energy installation with hydraulic drive

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Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee