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Load Assumptions for the Design of electro mechanic Pitch Systems. Andreas Manjock Germanischer Lloyd Industrial Services GmbH, Business Segment Wind Energy Andreas.Manjock @gl-group.com, www.gl-group.com/glwind. Source: ENERCON.

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slide1

Load Assumptions for the Design of electro mechanic Pitch Systems

Andreas Manjock

Germanischer Lloyd Industrial Services GmbH, Business Segment Wind Energy

[email protected], www.gl-group.com/glwind

slide2

Source: ENERCON

Load Assumptions for the Design of electro mechanic Pitch Systems

  • Design of electro mechanic Pitch System
  • Simulation Model
  • Design Load Cases (DLCs)
  • Data Postprocessing
  • Conclusion and Outlook

EWEC 2007

slide3

Drive Motor

iPD

iPB

JPD

JRB

Blade Bearing

Gear Box

Rotor Blade

iP

1.1 Pitch System Components

Control Unit

PitchController

EWEC 2007

slide4

Source: ENERCON

Load Assumptions for the Design of electro mechanic Pitch Systems

  • Design of electro mechanic Pitch System
  • Simulation Model2.1 Load Components2.2 System Model2.3 Local Model for Mesh Moment2.4 Drive Motor Characteristics2.5 Drive Motor Limitations2.6 Drive Control Scheme
  • Design Load Cases (DLCs)
  • Data Postprocessing
  • Conclusion and Outlook

EWEC 2007

slide5

αP

MZB

MR

MPDA

2.1 Load Components

Blade Root Coordinate System

MR = M0 + µbend∙ Mres+ µaxial∙ Faxial+ µradial∙ Fradial

Source: GL „Guideline for the Certification of Wind Turbines“, 2003

EWEC 2007

slide6

α

Global Simulation Model

P

M

i

•M

ZB

P

PDA

M

α

R

J

**

RB

P

2

α

J

•i

**

PD

P

P

2

i

J

+J

P

PD

RB

Source: GH Bladed 3.67

2.2 System Model

Structural Model

EWEC 2007

slide7

α

P

•M

M

M

i

•M

M

ZB

M

P

PDA

M

R

J

•α

**

RB

P

2

α

J

•i

**

PD

P

P

+J

RB

Mass System Pitch Drive

Mass System Rotor Blade

Split of Mass System provides Loads for Drive Train Components

2.3 Local Model for Mesh Moment

Local MM - Assumption“

α

P

2

i

J

P

PD

MM = MZB+ JRB ∙ αP** - MR

EWEC 2007

slide8

2.4 Drive Motor Characteristics

Drive Motor

iPP

MPDA

Control Unit

PitchController

Source: OAT Osterholz Antriebstechnik GmbH

EWEC 2007

slide9

2.5 Drive Motor Limitations

Source: OAT Osterholz Antriebstechnik GmbH

EWEC 2007

slide10

2.6 Drive Motor Control Scheme

PitchController

EWEC 2007

slide11

Source: ENERCON

Load Assumptions for the Design of electro mechanic Pitch Systems

  • Design of electro mechanic Pitch System
  • Simulation Model
  • Design Load Cases (DLCs)3.1 Identified Load Cases 3.2 Fatigue DLCs3.3 Extreme DLCs
  • Data Postprocessing
  • Conclusion and Outlook

EWEC 2007

slide12

3.2 Identified Load Cases

Fatigue Load Cases

Extreme Load Cases

Wind

EWEC 2007

slide13

3.3 Fatigue DLCs

Control Variables

Load Variables

EWEC 2007

slide14

3.4 Extreme DLCs

Control Variables

Load Variables

EWEC 2007

slide15

Source: ENERCON

Load Assumptions for the Design of electro mechanic Pitch Systems

  • Design of electro mechanic Pitch System
  • Simulation Model
  • Design Load Cases (DLCs)
  • Data Postprocessing4.1 Design Driver4.2 Loads for Drive Motor4.3 Loads for Gearbox4.4 Loads for Blade Bearing Mesh
  • Conclusion and Outlook

EWEC 2007

slide17

4.2.1 Loads for Drive Motor

  • Operation States of Drive Motor, Confirmation of global Wind Turbine Simulation

EWEC 2007

4 2 2 thermal loads for drive motor
4.2.2 Thermal Loads for Drive Motor
  • Standard Deviation (RMS) of pitch actuator torque for thermal impact
  • Efficiency of gear box and has to be considered

Normal bearing friction Increased bearing friction (+50%)

EWEC 2007

slide19

M_M > 0

M_M < 0

4.3 Loads for Gearbox

  • Load Duration Distribution counting for Mesh Torque M_M
  • Influence of Blade Bearing Friction Level comparatively low

EWEC 2007

slide20

4.4 Loads for Blade Bearing Mesh

  • Load Duration Distribution counting for Mesh Torque M_M
  • Pitch Angle Duration Distribution counting

EWEC 2007

slide21

Source: ENERCON

Load Assumptions for the Design of electro mechanic Pitch Systems

  • Design of electro mechanic Pitch System
  • Simulation Model
  • Design Load Cases (DLCs)
  • Data Postprocessing
  • Conclusion and Outlook

EWEC 2007

slide22

5 Conclusion and Outlook

  • Aerodynamic pitch Moment MZB is not sufficient for the design of pitch systems drive train Pitch Actuator Torque is inevitable
  • Blade bearing friction model included in the global simulation model
  • Integration of drive control unit into the global simulation model, e.g. limitations in speed and torque of pitch drive actuator
  • 80% damage within first 20°- 25° of blade bearing mesh
  • Measurements on drive trains of pitch systems to validate MM-assumption

EWEC 2007

keep in contact
Keep in Contact

Andreas ManjockGermanischer Lloyd Industrial [email protected], www.gl-group.com/glwind

EWEC 2007

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