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DE20017994U1 - Hybrid pitch drive for wind turbines - Google Patents

Hybrid pitch drive for wind turbines

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Publication number
DE20017994U1
DE20017994U1 DE20017994U DE20017994U DE20017994U1 DE 20017994 U1 DE20017994 U1 DE 20017994U1 DE 20017994 U DE20017994 U DE 20017994U DE 20017994 U DE20017994 U DE 20017994U DE 20017994 U1 DE20017994 U1 DE 20017994U1
Authority
DE
Germany
Prior art keywords
hydraulic
wind turbines
rotor
drive
item
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 - Lifetime
Application number
DE20017994U
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German (de)
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SB Patent Holding ApS
Original Assignee
STEVEN JOACHIM
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 STEVEN JOACHIM filed Critical STEVEN JOACHIM
Priority to DE20017994U priority Critical patent/DE20017994U1/en
Publication of DE20017994U1 publication Critical patent/DE20017994U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (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)
  • Wind Motors (AREA)

Description

Joachim Steven . _ 19.10.00Joachim Steven . _ 19.10.00

Heinrich-Heine-Str. 64 -Heinrich-Heine-Str. 64 -

30173 Hannover . Joachim.Steven@t-online.de30173 Hanover . Joachim.Steven@t-online.de

Beschreibung eines hybriden Pitch-Antriebes für WindkraftanlagenDescription of a hybrid pitch drive for wind turbines

Moderne Windkraftanlagen (WKA) weisen zur Anpassung an unterschiedliche Windverhältnisse eine elektrische oder hydraulische Verstellung (Pitch-Verstellung) der einzelnen Rotorblätter auf. Durch eine stetige Verstellung der Blätter in axialer Richtung werden die Parameter Drehzahl und Drehmoment einem Optimum in der Betriebsführung der WKA angepasst und es kann bei Bedarf auch aerodynamisch gebremst werden, um Überdrehzahlen zu vermeiden.Modern wind turbines (WTGs) have an electrical or hydraulic adjustment (pitch adjustment) of the individual rotor blades to adapt to different wind conditions. By continuously adjusting the blades in the axial direction, the speed and torque parameters are adjusted to an optimum in the operation of the WTG and, if necessary, aerodynamic braking can also be used to avoid overspeeding.

Um kritische Drehzahlen auch in Notfällen nicht zu überschreiten, sind die Rotorblätter bei den meisten Herstellern unabhängig voneinander verstellbar, um eine Redundanz bei einer Notbremsung zu erreichen. Die in einer Not-Aus-Situation erforderliche Energie wird bei elektrisch verstellbaren Antrieben durch einen Akkumulator pro Rotorblatt zur Verfügung gestellt, hydraulische Systeme verwenden analog einen Hydraulik-Speicher.In order not to exceed critical speeds even in emergencies, most manufacturers adjust the rotor blades independently of one another to achieve redundancy in the event of an emergency braking. The energy required in an emergency stop situation is provided by an accumulator per rotor blade in electrically adjustable drives; hydraulic systems use a similar hydraulic accumulator.

Sowohl der elektrische als auch der hydraulische Antrieb weisen Nachteile auf:Both the electric and hydraulic drive have disadvantages:

• die Speicherung elektrischer Energie ist mit hohen Beschaffungskosten für den Akkumulator verbunden. Durch relativ kurze Wartungszyklen, verbunden mit aufwendigem Austausch in Höhen von bis zu 100 m entstehen darüber hinaus während der Lebensdauer der WKA hohe Betriebskosten. Die Akkumulatoren haben eine große Masse und benötigen viel Bauraum.• storing electrical energy is associated with high procurement costs for the accumulator. Relatively short maintenance cycles, combined with complex replacement at heights of up to 100 m, also result in high operating costs over the service life of the wind turbine. The accumulators are large and require a lot of installation space.

• hydraulisch verstellbare Systeme benötigen für die Ölversorgung ein zentrales Antriebsaggregat, bestehend hauptsächlich aus Ölbehälter, Pumpen und zugehöriger Steuerung, welches nicht im sich drehenden Rotor, sondern in der stehenden Gondel untergebracht ist. Das Hydrauliköl muss unter Druck über eine Drehdurchführung in der Rotorwelle zu den Verstellzylindern der Rotorblätter geführt werden. Neben der Verschleißanfälligkeit der Drehdurchführung und der damit verbundenen Kosten während der Anlagenlebensdauer ist ein hoher mechanischer Aufwand innerhalb des Rotors erforderlich ( die translatorische Bewegung eines Hydraulikzylinders wird in die rotatorische des Rotorblattes umgesetzt).• Hydraulically adjustable systems require a central drive unit for the oil supply, consisting mainly of an oil tank, pumps and the associated control system, which is not housed in the rotating rotor, but in the stationary nacelle. The hydraulic oil must be fed under pressure via a rotary union in the rotor shaft to the adjustment cylinders of the rotor blades. In addition to the rotary union being susceptible to wear and the associated costs over the service life of the system, a high level of mechanical effort is required within the rotor (the translational movement of a hydraulic cylinder is converted into the rotary movement of the rotor blade).

Joachim Steven 19.10.00Joachim Steven 19.10.00

Heinrich-Heine-Str. 64Heinrich-Heine-Str. 64

30173 Hannover Joachim.Steven@t-online.de30173 Hanover Joachim.Steven@t-online.de

Durch eine neue Antriebskonzeption soll die aufwendige Speicherung elektrischer Energie durch Einsatz eines hydraulischen Energiespeichers ersetzt werden. Der technische Aufwand für die Hydraulik soll dabei durch neuartige Aggregate auf ein Minimum beschränkt werden.A new drive concept is intended to replace the complex storage of electrical energy with the use of a hydraulic energy storage system. The technical effort required for the hydraulics is to be kept to a minimum by using new types of units.

Der hybride Pitch-Antrieb vereinigt die Vorzüge beider Systeme durch eine Kombination aus elektrischem und hydraulischem Antrieb. Neben dem Elektromotor kommt pro Rotorblatt noch ein Hydraulik-Motor (Schnelllaufender Hydraulik-Motor, z.B. Zahnrad-Motor) mit zugehörigem Hydraulik-Aggregat zum Einsatz, der bei Ausfall der Versorgungsspannung für die &Egr;-Motoren oder bei Not-Aus das Rotorblatt in die sogenannte „Fahnenstellung" , d.h. aus dem Wind, dreht und dadurch die aerodynamische Bremsung bewirkt. Der Hydraulikmotor kann dabei entweder in Reihe mit dem &Egr;-Motor auf einer Welle arbeiten (&Egr;-Motor mit zweitem Wellenende) , oder an einer separaten Antriebswelle des Planetengetriebes. Im Normalbetrieb der WKA wird der Hydraulikmotor nur passiv mitgeführt und fördert das Öl im Hydraulik-Kreislauf drucklos um. Zeichn.-Nr. 1, Blatt 1 zeigt schematisch den Aufbau der Pitch-Antriebe innerhalb des Rotors. .The hybrid pitch drive combines the advantages of both systems through a combination of electric and hydraulic drive. In addition to the electric motor, a hydraulic motor (high-speed hydraulic motor, e.g. gear motor) with an associated hydraulic unit is used for each rotor blade, which turns the rotor blade into the so-called "flag position", i.e. out of the wind, in the event of a power failure for the E-motors or an emergency stop, thereby causing aerodynamic braking. The hydraulic motor can either work in series with the E-motor on one shaft (E-motor with a second shaft end), or on a separate drive shaft of the planetary gear. During normal operation of the wind turbine, the hydraulic motor is only passively driven and pumps the oil in the hydraulic circuit without pressure. Drawing No. 1, Sheet 1 shows a schematic of the structure of the pitch drives within the rotor.

Die zum Aufladen verwendeten Hydraulikaggregate sind als weitere Neuheit als geschlossenes System ausgeführt und rotieren im Rotor mit Die Ausführung des Antriebsaggregates kann entsprechend Zeichnung 1, Blatt 2, oder ähnlich ausgeführt werden.As a further innovation, the hydraulic units used for charging are designed as a closed system and rotate in the rotor. The design of the drive unit can be according to drawing 1, sheet 2, or similar.

Funktion : Um hydraulische Energie zu speichern, wird nach Betätigung eines Sitzventils (Pos. 1) mittels elektrisch angetriebener Hydraulik-Pumpe (Pos. 2) Öl in den mit Stickstoff vorgespannten Hydraulikspeicher (Pos. 3) gepumpt. Das Erreichen und Halten eines anlagenspezifisch vorgegebenen Mindestdruckes und damit auch der Füllmenge wird mittels Drucksensor (Pos. 4) stetig überwacht. Eine Drucküberschreitung des Druckbehälters wird durch ein geprüftes Druckbegrenzungsventil (Pos. 5) verhindert. Mittels eines leckölfreien Sitzventils (Pos. 6) kann der Speicher z.B. für Wartungsarbeiten entlastet werden. Bei Spannungsausfall oder bei Not-Aus fällt das Sitzventil (Pos. 1) federzentriert in seine Nulllage, und der Hydraulikspeicher entlädt sich entsprechend der an einer Drossel (Pos. 7) eingestellten Geschwindigkeit über den Hydraulik-Motor (Pos. 8) zum Tank. Durch den am Motor entstehenden Druckabfall und das dadurch erzeugte Drehmoment wird das Rotorblatt in die Fahnenstellung bewegt.Function: In order to store hydraulic energy, after actuating a seat valve (item 1), oil is pumped into the nitrogen-preloaded hydraulic accumulator (item 3) by means of an electrically driven hydraulic pump (item 2). The reaching and maintenance of a system-specific minimum pressure and thus also the fill level is constantly monitored by a pressure sensor (item 4). A tested pressure relief valve (item 5) prevents the pressure in the pressure vessel from being exceeded. The accumulator can be relieved, e.g. for maintenance work, using a leak-free seat valve (item 6). In the event of a power failure or emergency stop, the seat valve (item 1) falls spring-centered to its zero position and the hydraulic accumulator discharges to the tank via the hydraulic motor (item 8) at the speed set at a throttle (item 7). The pressure drop occurring at the engine and the resulting torque move the rotor blade into the feather position.

Da sich das Hydrauliksystem innerhalb des rotierenden Rotors befindet, muss es komplett geschlossen ausgeführt werden. Es besteht keine atmosphärische Verbindung zwischenSince the hydraulic system is located inside the rotating rotor, it must be completely closed. There is no atmospheric connection between

Joachim Steven Heinrich-Heine-Str. 64 30173 HannoverJoachim Steven Heinrich-Heine-Str. 64 30173 Hanover

19.10.00 Joachim.Steven@t-online.de10/19/00 Joachim.Steven@t-online.de

Öloberfläche im Ölbehälter und dem Außendruck . Unterschiedliche Ölvolumen im Ölbehälter, hervorgerufen durch den Ladezustand des Hochdruckspeichers (Pos. 3), werden durch einen Niederdruck-Stickstoffspeicher (Pos. 9) ausgeglichen. Mittels einer Entlüftung des Ölbehälters (Pos. 10) wird sichergestellt, dass sich keine Luft im Hydraulikbehälter befindet. Ein Ansaugen von Luft durch die Pumpe oder Kavitation (Pos. 1) wird so in allen Betriebsituationen sicher verhindert.Oil surface in the oil tank and the external pressure. Different oil volumes in the oil tank, caused by the charge level of the high-pressure accumulator (item 3), are compensated by a low-pressure nitrogen accumulator (item 9). By venting the oil tank (item 10), it is ensured that there is no air in the hydraulic tank. Suction of air by the pump or cavitation (item 1) is thus reliably prevented in all operating situations.

Vorteile des hybriden Pitch-Antriebes :Advantages of the hybrid pitch drive:

einfacher mechanischer Aufbau des elektrischen Antriebes bestehend aus Ritzel, Planetengetriebe und drehzahlregelbarem E-MotorSimple mechanical design of the electric drive consisting of pinion, planetary gear and speed-adjustable electric motor

einfache Drehzahlregelung des &Egr;-Motors durch Frequenzumrichter problemlose elektrische Energieübertragung von der Gondel in den Rotor durch SchleifringübertragungSimple speed control of the Egr; motor by frequency converter Easy electrical energy transfer from the nacelle to the rotor by slip ring transmission

Speicherung der Not-Aus-Energie durch Hydraulikspeicher und damit verbunden kleine Massen und BauräumeStorage of emergency stop energy through hydraulic accumulators and the associated small masses and installation spaces

Hydraulikaggregat in der Gondel ist für die Pitch-Verstellung nicht mehr notwendig damit entfällt die Drehdurchführung.The hydraulic unit in the nacelle is no longer required for pitch adjustment, thus eliminating the need for a rotary union.

Gesamtsystem der hydraulischen Energiespeicherung ist aufgrund der höheren Energiedichte kostengünstiger als die Speicherung von elektrischer Energie.The overall system of hydraulic energy storage is more cost-effective than the storage of electrical energy due to the higher energy density.

keine Leckage des Hydraulik-Systems durch geschlossene Bauweise äußerer Schmutzeintrag in das Hydrauliksystem der Pitch-Verstellung ist ausgeschlossen.No leakage of the hydraulic system due to the closed design. External dirt ingress into the hydraulic system of the pitch adjustment is excluded.

Hydraulikaggregat kann durch geschlossene Bauweise in der Rotornabe der WKAHydraulic unit can be installed in the rotor hub of the wind turbine due to its closed design

mitrotierenrotate along

Claims (4)

1. Pitch-Antrieb für Windkraftanlagen, gekennzeichnet durch hybride Ausführung (elektrischer und hydraulischer Antrieb in Kombination) 1. Pitch drive for wind turbines, characterized by hybrid design (electric and hydraulic drive in combination) 2. Hydraulisches Antriebsaggregat für Windkraftanlagen, gekennzeichnet durch geschlossene Bauweise und Einsatz eines Niederdruck-Speichers 2. Hydraulic drive unit for wind turbines, characterized by closed design and use of a low-pressure accumulator 3. hydraulische Schaltung des Antriebsaggregates, gekennzeichnet durch Einsatz eines Druckspeichers, der in Kombination mit einem Sitzventil und einer Pumpe das Rotorblatt bei Spannungsabfall automatisch in eine sichere Lage dreht. 3. hydraulic circuit of the drive unit, characterized by the use of a pressure accumulator which, in combination with a seat valve and a pump, automatically rotates the rotor blade into a safe position in the event of a voltage drop. 4. Anordnung der Hydraulikaggregate, gekennzeichnet durch Einbau der Aggregate in den rotierenden Rotor der Windkraftanlage. 4. Arrangement of the hydraulic units, characterized by installation of the units in the rotating rotor of the wind turbine.
DE20017994U 2000-10-19 2000-10-19 Hybrid pitch drive for wind turbines Expired - Lifetime DE20017994U1 (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002040862A1 (en) * 2000-11-14 2002-05-23 Aloys Wobben Wind energy turbine
WO2002048545A1 (en) * 2000-12-12 2002-06-20 Bosch Rexroth Ag Hydraulic unit for adjusting the rotor blades of a wind turbine
DE10127454A1 (en) * 2001-06-07 2002-12-12 Aloys Wobben Switching device with actuation shaft for wind power system, has actuation shaft rigidly connected to rotor blade, actuator with crank section joined to actuation shaft and at least one switch
DE10140793A1 (en) * 2001-08-20 2003-03-06 Gen Electric Device for adjusting the rotor blade of a rotor of a wind turbine
EP1647708A1 (en) * 2004-10-14 2006-04-19 General Electric Company Pitch drive system for a wind turbine
DE202005015774U1 (en) * 2005-10-07 2007-02-15 Liebherr-Werk Biberach Gmbh Actuator for adjusting the angle of attack of a rotor blade
WO2009064264A1 (en) * 2007-11-09 2009-05-22 Moog Inc. Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine
DE102008051329A1 (en) 2008-10-15 2010-04-22 Suzlon Energy Gmbh Wind turbine for producing electrical energy from wind energy, has stator designed and equipped such that rotating magnetic field is produced at stator with respect to armature that stops relative to housing
ITBO20090414A1 (en) * 2009-06-25 2010-12-26 Bonfiglioli Riduttori Spa GROUP FOR COMMANDING THE WINDLESS ORIENTATION OF A WIND GENERATOR
EP2461453A1 (en) * 2010-12-06 2012-06-06 HAWE Hydraulik SE Reactive power compensation for auxiliary actuators in a solar or wind power station
WO2012109461A1 (en) * 2011-02-10 2012-08-16 Inventus Holdings, Llc Method for positioning a hydraulic accumulator in a hub of a wind- powered electric generator
EP2584192A1 (en) * 2011-10-19 2013-04-24 Siemens Aktiengesellschaft Pitch adjustment device
EP2698533A1 (en) 2012-08-17 2014-02-19 Moog Unna GmbH Electric hydraulic pitch drive, wind or water turbine and method for operating an electric hydraulic pitch drive
WO2014118373A1 (en) * 2013-02-01 2014-08-07 2-B Energy Holding B.V. Control device for a yaw system of a wind power plant
EP2778396A1 (en) * 2013-03-13 2014-09-17 Areva Wind GmbH Hydraulic braking system, wind generator comprising a hydraulic braking system and use of an automatic air bleed valve in a hydraulic braking system
ITVR20130105A1 (en) * 2013-05-03 2014-11-04 Treccani Engineering S R L WIND TURBINE
CN107587975A (en) * 2017-08-14 2018-01-16 山东中车风电有限公司 A kind of wind-driven generator hydraulic blade pitch device and system
EP3404256A1 (en) 2017-05-18 2018-11-21 Enbreeze GmbH Device for adjusting the rotor blades of a flow force installation
CN109667714A (en) * 2017-10-17 2019-04-23 新疆金风科技股份有限公司 Fluid pressure pitch-controlled system and its control method
DE102020002452B3 (en) 2020-04-23 2021-08-12 Siemens Gamesa Renewable Energy Service Gmbh Pitch drive for a rotor blade of a wind turbine and method for operating a pitch drive

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002214973B2 (en) * 2000-11-14 2005-05-26 Aloys Wobben Wind energy turbine
US6939103B2 (en) 2000-11-14 2005-09-06 Aloys Wobben Wind power installation with multiple blade adjusting devices
WO2002040862A1 (en) * 2000-11-14 2002-05-23 Aloys Wobben Wind energy turbine
WO2002048545A1 (en) * 2000-12-12 2002-06-20 Bosch Rexroth Ag Hydraulic unit for adjusting the rotor blades of a wind turbine
DE10127454A1 (en) * 2001-06-07 2002-12-12 Aloys Wobben Switching device with actuation shaft for wind power system, has actuation shaft rigidly connected to rotor blade, actuator with crank section joined to actuation shaft and at least one switch
DE10140793A1 (en) * 2001-08-20 2003-03-06 Gen Electric Device for adjusting the rotor blade of a rotor of a wind turbine
US6783326B2 (en) 2001-08-20 2004-08-31 General Electric Company Means for adjusting the rotor blade of a wind power plant rotor
EP1647708A1 (en) * 2004-10-14 2006-04-19 General Electric Company Pitch drive system for a wind turbine
US7699584B2 (en) 2005-10-07 2010-04-20 Liebherr-Werk Biberach Gmbh Actuator for adjusting a rotor blade pitch angle
DE202005015774U1 (en) * 2005-10-07 2007-02-15 Liebherr-Werk Biberach Gmbh Actuator for adjusting the angle of attack of a rotor blade
AU2007360945B2 (en) * 2007-11-09 2012-02-23 Moog Inc. Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine
WO2009064264A1 (en) * 2007-11-09 2009-05-22 Moog Inc. Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine
CN101918709B (en) * 2007-11-09 2013-01-02 莫戈公司 Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine
DE102008051329A1 (en) 2008-10-15 2010-04-22 Suzlon Energy Gmbh Wind turbine for producing electrical energy from wind energy, has stator designed and equipped such that rotating magnetic field is produced at stator with respect to armature that stops relative to housing
DE102008051329B4 (en) * 2008-10-15 2011-04-21 Suzlon Energy Gmbh Wind turbine with increased overvoltage protection
ITBO20090414A1 (en) * 2009-06-25 2010-12-26 Bonfiglioli Riduttori Spa GROUP FOR COMMANDING THE WINDLESS ORIENTATION OF A WIND GENERATOR
EP2461453A1 (en) * 2010-12-06 2012-06-06 HAWE Hydraulik SE Reactive power compensation for auxiliary actuators in a solar or wind power station
WO2012109461A1 (en) * 2011-02-10 2012-08-16 Inventus Holdings, Llc Method for positioning a hydraulic accumulator in a hub of a wind- powered electric generator
EP2584192A1 (en) * 2011-10-19 2013-04-24 Siemens Aktiengesellschaft Pitch adjustment device
EP2698533A1 (en) 2012-08-17 2014-02-19 Moog Unna GmbH Electric hydraulic pitch drive, wind or water turbine and method for operating an electric hydraulic pitch drive
WO2014118373A1 (en) * 2013-02-01 2014-08-07 2-B Energy Holding B.V. Control device for a yaw system of a wind power plant
EP2778396A1 (en) * 2013-03-13 2014-09-17 Areva Wind GmbH Hydraulic braking system, wind generator comprising a hydraulic braking system and use of an automatic air bleed valve in a hydraulic braking system
ITVR20130105A1 (en) * 2013-05-03 2014-11-04 Treccani Engineering S R L WIND TURBINE
EP3404256A1 (en) 2017-05-18 2018-11-21 Enbreeze GmbH Device for adjusting the rotor blades of a flow force installation
DE102017004909A1 (en) 2017-05-18 2018-11-22 Enbreeze Gmbh Device for adjusting the rotor blades of a flow force plant
CN107587975A (en) * 2017-08-14 2018-01-16 山东中车风电有限公司 A kind of wind-driven generator hydraulic blade pitch device and system
CN109667714A (en) * 2017-10-17 2019-04-23 新疆金风科技股份有限公司 Fluid pressure pitch-controlled system and its control method
CN109667714B (en) * 2017-10-17 2020-01-31 新疆金风科技股份有限公司 Hydrostatic pitch system and its control method
DE102020002452B3 (en) 2020-04-23 2021-08-12 Siemens Gamesa Renewable Energy Service Gmbh Pitch drive for a rotor blade of a wind turbine and method for operating a pitch drive
EP3901453A1 (en) 2020-04-23 2021-10-27 Siemens Gamesa Renewable Energy Service GmbH Pitch drive for a rotor blade of a wind turbine and method for operating a pitch drive

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