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3 Model of the Turbine Structural Dynamics3.1 Introduction; 3.2 Higher Order Representations of Drive Train, Blades and Tower; 3.2.1 Gearbox Representation; 3.2.2 Representation of Higher Order Drive Train Eigenfrequencies; 3.2.3 Detailed Blade Structural Representation; 3.2.4 Tower Shadow, Rotor Imbalance and Rotor Eigenfrequencies; 3.2.5 Impact of Production Tolerances and Aging Effects; 3.2.6 Tower Representation; 3.3 Single and Two Mass Representation of the Drive Train; 3.3.1 Single Mass Representation of the Drive Train; 3.3.2 Two Mass Representation of the Drive Train.
3.3.3 Comparison of Single and Two Mass Representations 3.4 Summary; 4 Model of the Turbine Control; 4.1 Introduction; 4.2 Fixed Speed / Limited Speed Range Wind Turbine Control; 4.3 Variable Speed Wind Turbine Control; 4.3.1 Operation below Rated Wind Speed; 4.3.2 Operation at and Beyond Rated Wind Speed; 4.4 Pitch Control Loop; 4.4.1 Pitch-Speed Controller; 4.4.3 Pitch FRT Boost; 4.4.4 Pitch Actuator Model; 4.4.5 Pitch Controller and Actuator Models; 4.5 Torque/Active Power Control Loop; 4.5.1 Power or Torque PI Control; 4.5.2 Effect of Drive Train Damping on Power Output; 4.6 Summary.
5 Generator and Converter5.1 Introduction; 5.2 Model of the DFG; 5.2.1 Basic DFG Equations; 5.2.2 DFG Model Representation; 5.2.3 MSC Control Representations; 5.2.4 Combined DFG and MSC Model; 5.2.5 LSC Model Representation; 5.2.6 Aggregated DFG Model; 5.2.7 Selection of Reference Frame; 5.2.8 Optional Identification of Model Parameters; 5.2.9 Simplified Aggregated Model of DFG using First Order Lag; 5.3 Model of the FSC; 5.4 Model Structure; 5.4.1 Implementation of the Norton Equivalent (Current Source); 5.4.2 Current Limitation; 5.4.3 Wind turbine Transformer.
3.3.3 Comparison of Single and Two Mass Representations 3.4 Summary; 4 Model of the Turbine Control; 4.1 Introduction; 4.2 Fixed Speed / Limited Speed Range Wind Turbine Control; 4.3 Variable Speed Wind Turbine Control; 4.3.1 Operation below Rated Wind Speed; 4.3.2 Operation at and Beyond Rated Wind Speed; 4.4 Pitch Control Loop; 4.4.1 Pitch-Speed Controller; 4.4.3 Pitch FRT Boost; 4.4.4 Pitch Actuator Model; 4.4.5 Pitch Controller and Actuator Models; 4.5 Torque/Active Power Control Loop; 4.5.1 Power or Torque PI Control; 4.5.2 Effect of Drive Train Damping on Power Output; 4.6 Summary.
5 Generator and Converter5.1 Introduction; 5.2 Model of the DFG; 5.2.1 Basic DFG Equations; 5.2.2 DFG Model Representation; 5.2.3 MSC Control Representations; 5.2.4 Combined DFG and MSC Model; 5.2.5 LSC Model Representation; 5.2.6 Aggregated DFG Model; 5.2.7 Selection of Reference Frame; 5.2.8 Optional Identification of Model Parameters; 5.2.9 Simplified Aggregated Model of DFG using First Order Lag; 5.3 Model of the FSC; 5.4 Model Structure; 5.4.1 Implementation of the Norton Equivalent (Current Source); 5.4.2 Current Limitation; 5.4.3 Wind turbine Transformer.