Variable Speed Generators provides an in-depth examination of variable-speed generators for both stand-alone and grid-connected applications.

Features:

• Provides a comprehensive survey of all types of variable-speed electric generators
• Covers the various topologies, steady state, transients, modeling, performance, control, design, and testing
• Includes self-contained coverage of variable-speed generators not available in any other single source
• Imparts practical, state-of-the-art knowledge for the design and control of starter alternators for hybrid-electric vehicles, wind and hydro generators, and linear motion generators

Contents

Wound Rotor Induction Generators (WRIGS): Steady State

• Construction Elements
• Steady-State Equations
• Equivalent Circuit
• Phasor Diagrams
• Operation at the Power Grid
• Autonomous Operation of WRIG
• Operation of WRIG in the Brushless Exciter Mode
• Losses and Efficiency of WRIG

Wound Rotor Induction Generators: Transients and Control

• The WRIG Phase Coordinate Model
• The Space-Phasor Model of WRIG
• Space-Phasor Equivalent Circuits and Diagrams
• Approaches to WRIG Transients
• Static Power Converters for WRIGs
• Vector Control of WRIG at Power Grid
• Direct Power Control (DPC) of WRIG at Power Grid
• Independent Vector Control of Positive and Negative Sequence Currents
• Motion-Sensorless Control
• Vector Control in Stand-Alone Operation
• Self-Starting, Synchronization, and Loading at the Power Grid
• Voltage and Current Low-Frequency Harmonics of WRIG

Wound Rotor Induction Generators (WRIGS): Design and Testing

• Design Specifications: An Example
• Stator Design
• Rotor Design
• Magnetization Current
• Reactances and Resistances
• Electrical Losses and Efficiency
• Testing of WRIGs

Self-Excited Induction Generators

• The Cage Rotor Induction Machine Principle
• Self-Excitation: A Qualitative View
• Steady-State Performance of Three-Phase SEIGs
• Performance Sensitivity Analysis
• Pole Changing SEIGs for Variable Speed Operation
• Unbalanced Operation of Three-Phase SEIGs
• One Phase Open at Power Grid
• Three-Phase SEIG with Single-Phase Output
• Two-Phase SEIGs with Single-Phase Output
• Three-Phase SEIG Transients
• Parallel Connection of SEIGs
• Connection Transients in Cage Rotor Induction Generators at Power Grid
• More on Power Grid Disturbance Transients in Cage Rotor Induction Generators

Stator Converter Controlled Induction Generators(SCIGs)

• Grid Connected SCIGs: The Control System
• Grid Connection and Four-Quadrant Operation of SCIGs
• Stand-Alone Operation of SCIG
• Parallel Operation of SCIGs
• Static Capacitor Exciter Stand-Alone IG for Pumping Systems
• Operation of SCIGs with DC Voltage Controlled Output
• Dual Stator Winding for Grid Applications

Automotive Claw-Pole-Rotor Generator Systems

• Construction and Principle
• Magnetic Equivalent Circuit (MEC) Modeling
• Three-Dimensional Finite Element Method (3D FEM) Modeling
• Losses, Efficiency, and Power Factor
• Design Improvement Steps
• The Lundell Starter/Generator for Hybrid Vehicles

Induction Starter/Alternators (ISAs) for Electric Hybrid Vehicles (EHVs)

• EHV Configuration
• Essential Specifications
• Topology Aspects of Induction Starter/Alternator (ISA)
• ISA Space-Phasor Model and Characteristics
• Vector Control of ISA
• DTFC of ISA
• ISA Design Issues for Variable Speed

Permanent-Magnet-Assisted Reluctance Synchronous Starter/Alternators For Electric Hybrid Vehicles

• Topologies of PM-RSM
• Finite Element Analysis
• The d-q Model of PM-RSM
• Steady-State Operation at No Load and Symmetric Short-Circuit
• Design Aspects for Wide Speed Range Constant Power Operation
• Power Electronics for PM-RSM for Automotive Applications
• Control of PM-RSM for EHV
• State Observers without Signal Injection for Motion Sensorless Control
• Signal Injection Rotor Position Observers
• Initial and Low Speed Rotor Position Tracking

Switched Reluctance Generators and Their Control

• Practical Topologies and Principles of Operation
• SRG(M) Modeling
• The Flux/Current/Position Curves
• Design Issues
• PWM Converters for SRGs
• Control of SRG(M)s
• Direct Torque Control of SRG(M)s
• Rotor Position and Speed Observers for Motion-Sensorless Control
• Output Voltage Control in SRG

Permanent Magnet Synchronous Generator Systems

• Practical Configurations and Their Characterization
• Airgap Field Distribution, emf and Torque
• Stator Core Loss Modeling
• The Circuit Model
• Circuit Model of PMSG with Shunt Capacitors and AC Load
• Circuit Model of PMSG with Diode Rectifier Load
• Utilization of Third Harmonic for PMSG with Diode Rectifiers
• Autonomous PMSGs with Controlled Constant Speed and AC Load
• Grid-Connected Variable-Speed PMSG System
• The PM Genset with Multiple Outputs
• Super-High-Speed PM Generators: Design Issues
• Super-High-Speed PM Generators: Power Electronics Control Issues
• Design of a 42 Vdc Battery-Controlled-Output PMSG System
• Methods for Testing PMSGs
• Note on Medium-Power Vehicular Electric Generator Systems

Transverse Flux and Flux Reversal Permanent Magnet Generator Systems

• The Three-Phase Transverse Flux Machine (TFM): Magnetic Circuit Design
• TFM: The d-q Model and Steady State
• The Three-Phase Flux Reversal Permanent Magnet Generator: Magnetic and Electric Circuit Design

Linear Motion Alternators (LMAs)

• LMA Principle of Operation
• PM-LMA with Coil Mover
• Multipole LMA with Coil Plus Iron Mover
• PM-Mover LMAs
• The Tubular Homopolar PM Mover Single-Coil LMA
• The Flux Reversal LMA with Mover PM Flux Concentration
• PM-LMAs with Iron Mover
• The Flux Reversal PM-LMA Tubular Configuration
• Control of PM-LMAs
• Progressive-Motion LMAs for Maglevs with Active Guideway

Index

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