GB2526277A - Modular turbine mounting - Google Patents

Modular turbine mounting Download PDF

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Publication number
GB2526277A
GB2526277A GB1408812.4A GB201408812A GB2526277A GB 2526277 A GB2526277 A GB 2526277A GB 201408812 A GB201408812 A GB 201408812A GB 2526277 A GB2526277 A GB 2526277A
Authority
GB
United Kingdom
Prior art keywords
turbine
casting
blade
pitch
coupling
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.)
Withdrawn
Application number
GB1408812.4A
Other versions
GB201408812D0 (en
Inventor
Gerald Ireland
Brett Rowlandson
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.)
Marine Current Turbines Ltd
Original Assignee
Marine Current Turbines 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 Marine Current Turbines Ltd filed Critical Marine Current Turbines Ltd
Priority to GB1408812.4A priority Critical patent/GB2526277A/en
Publication of GB201408812D0 publication Critical patent/GB201408812D0/en
Publication of GB2526277A publication Critical patent/GB2526277A/en
Withdrawn legal-status Critical Current

Links

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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/14—Rotors having adjustable blades
    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
    • F03B13/264—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy using the horizontal flow of water resulting from tide movement
    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B15/00—Controlling
    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F03B17/061—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially in flow direction
    • 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
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • 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
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
    • F05B2240/913—Mounting on supporting structures or systems on a stationary structure on a mast
    • 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
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
    • F05B2240/916—Mounting on supporting structures or systems on a stationary structure with provision for hoisting onto the structure
    • 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
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/97—Mounting on supporting structures or systems on a submerged structure
    • 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
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/76—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism using auxiliary power sources
    • 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
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/79—Bearing, support or actuation arrangements therefor
    • 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
    • Y02E10/20—Hydro energy
    • 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
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/728—Onshore wind turbines

Abstract

A modular turbine hub comprises a cast housing (46, figure 4) comprising a plurality of openings, one for each turbine blade. A cast or machined coupling 33, 34 is connected to the hub and attaches the turbine blade. The coupling 33, 34 holds turbine pitch control electronics 50 and a turbine pitch mechanism 43. Machining of the hub is simpler because only a single component is attached to the hub for each blade. This arrangement is particularly suitable for reducing the complexity of the hub for a three bladed tidal turbine.

Description

MODULAR TURBINE MOUNTING
This invention relates to a modular turbine mounting, in particular for sub-sea, or water current turbines.
In a conventional two blade sub-sea turbine, the blades are mounted on a casting which is provided with orifices through which a mechanical drive mechanism for altering the pitch of each blade, typically a gearing arrangement, is provided. As well as the cast orifices for the blade pitch control, there is one for electrical connections to power and control the pitch mechanism. Meeting other requirements, such as lubrication, involves drilling holes through the casting, which requires a skilled operator and still risks errors in alignment between the drilled holes and the position at which lubrication within the casting is required. In an already complex design, a change from a two blade to a three blade turbine encounters even more difficulty.
In accordance with a first aspect of the present invention a modular turbine mounting comprises a cast housing comprising a plurality of openings and for each opening one or more connection points for connecting a cast or machined coupling to the housing; wherein the cast or machined coupling further comprises turbine pitch control electronics and a turbine pitch mechanism mounted to the coupling.
Preferably, the housing comprises three openings and a plurality of connection points for each opening.
Preferably, each coupling further comprises a gearing mechanism for rotating the turbine pitch mechanism in the housing.
Preferably, the mounting further comprises lubrication ports which have been cast or machined in the coupling.
In accordance with a second aspect of the present invention, a turbine comprises a turbine mounting according to the first aspect and a turbine blade mounted to each turbine pitch mechanism.
The present invention simplifies manufacture and reduces down-time for major maintenance of the pitch system.
An example of modular turbine mounting and method of construction according to the present invention will now be described with reference to the accompany drawings in which: Figure illustrates a conventional two blade turbine in situ; Figure 2 illustrates a casting for mounting the turbine blades of Fig.!; Figure 3 shows an example of a three blade turbine incorporating a modular turbine mounting according to the present invention; Figure 4 iflustrates the modular turbine mounting used in Fig.3 in more detail; and, Figure 5 illustrates a pitch module for the mounting of Fig.4 in detail.
Figure 1 illustrates a conventional tower mounted two blade turbine. The tower 1 is supported by rigid supports 2 at its base, fixed to the seabed. A cross-beam 3 is tO mounted on a moveable collar 4, by which the position of the beam on the tower can be raised or lowered on chains 5 operated from a control platform 6, above the surface of the water. At each end of the cross-beam, blades 10 of a two blade turbine 8 are mounted via a casting 9. Control electronics are housed in the control platform and cabling connected to the turbines allows their operation to be controlled, Lubricating fluid is supplied to the turbine drive mechanism within the casting through piping which passes through ports drilled in the casting. These ports add to the cost of manufacture, as it can be slow and difficult to drill the holes and position them with the correct alignment to the mechanism inside the casting. This can be seen in more detail in Fig,2 which shows one of the two openings II in the casting 9 to allow the pitch mechanism of the turbine to be connected to the turbine blade. Smaller drilled openings!3 are provided in a side part 12 of the casting for the lubrication piping and for coupling the pitch drive mechanism in the casting to the pitch control electronics in the control platform, Another larger opening 14 is provided for an electrical power cable.
Underwater turbines of the type shown in Fig, I are suitable for installation where access is reasonably straightforward and where the depth of water is not to great, as they rely on being able to install a pile which protmdes above the surface for mounting the control platform, In tidal situations, where the current reverses with each tide, the pitch of the turbine blades must be reversed with the tide to generate electricity efficiently. However, in open sea installations, depth and difficulty with access mean that a turbine blade mounted to a pile, which is below the level of the sea surface is preferable, In addition, efficiency can be improved by use of a three bladed system, rather than a two bladed one, Simply adding another turbine blade and pitch control to the existing casting would be complicated and expensive. Accurate machining, even of a two blade turbine mounting is difficult and the additional complexity of a three blade arrangement makes the manufacturing process expensive. Additionally, whilst maintenance of a tower mounted turbine close to shore may be relatively straightforward, it still requires each of the components to be removed individually and any issues with the pitch control takes the whole assembly out of operation for as long as it takes to fix the problem.
Nor is it possible to isolate the pitch system assembly for testing. With a more remote sub-sea turbine and more complex three bladed arrangement, testing and maintenance become extremely difficult.
An example of a turbine mounting for a three blade sub-sea turbine is illustrated in Fig.4. Instead of a single casting, with holes drilled afterwards and components mounted within the casting, the present invention uses a simplified main casting having a number of openings onto which are mounted secondary castings which support each turbine pitch mechanism and control electronics. The pitch mechanism is then connected to its respective turbine blade.
For a three blade turbine, the simplified main hub casting 46 has three, substantially equally spaced, openings onto which are mounted modular castings 52, one for each blade (not shown), For a two blade turbine, only two such openings would be required. In addition, an access point 41 with an access hatch (not shown) is provided in the main hub casting to allow service persoimel to enter the hub, The main hub casting also has pick-up points 39 and 40 for craning the main hub for assembly, or transport. The modular casting comprises a pitch casting mounting plate 45 which supports a slew bearing comprising a fixed lower part 34 in contact with the mounting plate of the modular casting 52 and a moving upper part 33, The upper part includes screw-in hook points 36 for lifting the slew bearing into place, The upper part 33 of the stew bearing comprises two rings, outer ring 47 and inner ring 32 with holes 30, 53, The upper and lower bearing rings 33, 34 along with the pitch casting mounting plate 45 are fixed to the main hub casting 46 by studs and nuts. The studs are screwed into "blind" holes in the main hub casting, having the same dimensions and quantity as the holes 30 in the outer part of the upper ring 33. The studs protrude through the pitch casting mounting plate 45 and both the upper and lower bearing rings 33, 34 with enough length to allow nuts to be screwed to the surface of outer ring 47. This fixes the bearing 33, 34 and pitch casting mounting plate to the hub 46. The blade is fixed to the inner ring 32 of the bearing via "blind" holes 53. These holes are approximately half the thickness of the bearing. Screwed into these holes 53 are studs the length of which is such that they allow nuts to be screwed to a matching face on the blade. The inner ring 32 of the bearing supports the blade and the inner ring is connected to teeth 31 on the inner surface of the bottom bearing, which mesh with and are driven by teeth on a gear 35, typically a pinion gear, driven by motor 43.
Fig.5 shows more detail of the modular casting 52. Access cover 48 allows access through the access point 41 in the main hub casting 46. Holes 51 are provided for bolts to bolt the modular casting 52 to the main hub casting 46. Gear 35 shown in Fig.4 is mounted to component 49 at the end of a drive shaft in drive motor 43. The drive motor 43 is provided with an electrical feed 50. Grease holes 54 in the modular casting 52 allow the distribution of grease from a pressurised lubrication accumulator 42 via a distribution manifold 44. Opening a valve in the manifold causes the grease to be distributed through the grease holes 54 to the components of the slewing bearing 31, 33, 34 of the modular pitch assembly.
The castings may be manufactured from spheroidal graphite cast iron by heating to around 1200 degrees centigrade, then pouring the molten material into a mould. The mould may be produced in sand from a wooden pattern, which is a negative of the finished part, The casting is then machined to the correct final dimensions.
The turbine pitch mechanism coupling of Fig.5 may be manufactured as a separate one piece casting, or machined on a tool which is quicker and more accurate than is possible with the current design. The coupling provides a base onto which the pitch control electronics 50 and drive mechanism 43 for the turbine blade are mounted.
The cast or machined coupling is bolted onto the main casting. Formation of the lubrication points 54 in the coupling avoids the need for later drilling.
This design of turbine blade mounting is easier to manufacture and to maintain that existing designs. Components of the control electronics are fitted as sub-assemblies which may be directly replaced. In case of faulls, the connection casting module is simply unbolted and removed for off-line fault finding, with another connection module installed in its place to minimise downtime. For the initial set-up, the pitch electronics can be connected to a turbine blade and tested separately, as no operational parts are mounted to the main casting. Once ready, the tested pitch mechanism and control electronics are simply bolted onto each opening of the main casting ready to operate.
This modular design provides flexibility and interchangeability of the pitch systems; removes complex internal machined features from the main hub casting; improves ease of assembly of parts to the main hub, as weli as ease of machining and maintenance. Independent testing of the pitch system in isolation from the main turbine allows improvements to be developed and investigation of in-service problems to be addressed away from the harsh sub-sea operating environment, With this modular arrangement, once the blades have been taken off the pitch mechanism, the rest of the removable equipment comes off as a single unit. This has benefits both in manufacturing and in repair.

Claims (5)

  1. CLAIMS1. A modular turbine mounting comprising a cast housing comprising a plurality of openings and for each opening one or more connection points for connecting a cast or machined coupling to the housing; wherein the cast or machined coupling thrther comprises turbine pitch control electronics and a turbine pitch mechanism mounted to the coupling.
  2. 2. A mounting according to claim t, wherein the housing comprises three openings and a plurality of connection points for each opening.
  3. 3. A mounting according to claim 1 or claim 2, wherein each coupling further comprises a gearing mechanism for rotating the turbine pitch mechanism in the housing.
  4. 4. A mounting according to any preceding claim further comprising lubrication ports which have been cast or machined in the coupling.
  5. 5. A turbine comprising a turbine mounting according to any preceding claim and a turbine blade mounted to each turbine pitch mechanism.
GB1408812.4A 2014-05-19 2014-05-19 Modular turbine mounting Withdrawn GB2526277A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1408812.4A GB2526277A (en) 2014-05-19 2014-05-19 Modular turbine mounting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408812.4A GB2526277A (en) 2014-05-19 2014-05-19 Modular turbine mounting

Publications (2)

Publication Number Publication Date
GB201408812D0 GB201408812D0 (en) 2014-07-02
GB2526277A true GB2526277A (en) 2015-11-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020042633A1 (en) * 2018-08-31 2020-03-05 北京金风科创风电设备有限公司 Mounting frame, energy storage unit, variable pitch system, wind turbine generator and method
JP2021521368A (en) * 2018-04-11 2021-08-26 ヴォッベン プロパティーズ ゲーエムベーハーＷｏｂｂｅｎ Ｐｒｏｐｅｒｔｉｅｓ Ｇｍｂｈ Wind turbine rotor hubs and how to assemble such rotor hubs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1959132A2 (en) * 2007-02-14 2008-08-20 Nordex Energy GmbH Wind farm with a pitch-pivot connection
WO2012069062A1 (en) * 2010-11-26 2012-05-31 Vestas Wind Systems A/S A pitch system for a wind turbine
US20130259688A1 (en) * 2012-03-29 2013-10-03 Envision Energy (Denmark) Aps Pitch lock system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1959132A2 (en) * 2007-02-14 2008-08-20 Nordex Energy GmbH Wind farm with a pitch-pivot connection
WO2012069062A1 (en) * 2010-11-26 2012-05-31 Vestas Wind Systems A/S A pitch system for a wind turbine
US20130259688A1 (en) * 2012-03-29 2013-10-03 Envision Energy (Denmark) Aps Pitch lock system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021521368A (en) * 2018-04-11 2021-08-26 ヴォッベン プロパティーズ ゲーエムベーハーＷｏｂｂｅｎ Ｐｒｏｐｅｒｔｉｅｓ Ｇｍｂｈ Wind turbine rotor hubs and how to assemble such rotor hubs
US11639708B2 (en) 2018-04-11 2023-05-02 Wobben Properties Gmbh Rotor hub of a wind turbine, and method for assembling such a rotor hub
WO2020042633A1 (en) * 2018-08-31 2020-03-05 北京金风科创风电设备有限公司 Mounting frame, energy storage unit, variable pitch system, wind turbine generator and method
US11493028B2 (en) 2018-08-31 2022-11-08 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Mounting frame, energy storage unit, pitch system, wind turbine and method

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