18-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Chapter 18 Utility Interface Power quality has become an important issue.

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Presentation transcript:

18-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Chapter 18 Utility Interface Power quality has become an important issue

18-2 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Various Loads Supplied by the Utility Source PCC is the point of common coupling

18-3 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Diode-Rectifier Bridge Bock diagram

18-4 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Typical Harmonics in the Input Current Single-phase diode-rectifier bridge

18-5 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Harmonic Guidelines: IEEE 519 commonly used for specifying limits on the input current distortion

18-6 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Harmonic Guidelines: IEEE 519 Limits on distortion in the input voltage supplied by the utility

18-7 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Reducing the Input Current Distortion use of passive filters

18-8 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Power-Factor-Correction (PFC) Circuit For meeting the harmonic guidelines

18-9 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Power-Factor-Correction (PFC) Circuit Control generating the switch on/off signals

18-10 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Power-Factor-Correction (PFC) Circuit Operation during each half-cycle

18-11 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Thyristor Converters for 4-Quadrant Operation Two back-to-back connected 2-quadrant converters

18-12 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Switch-Mode Converter Interface Bi-directional power flow; unity PF is possible

18-13 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Switch-Mode Converter Interface Rectifier and Inverter modes based on the direction of power flow

18-14 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Switch-Mode Converter Control DC bus voltage is maintained at the reference value

18-15 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Switch-Mode Converter Interface Waveforms in the rectifier mode

18-16 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface 3-Phase Switch-Mode Converter Interface Rectifier and Inverter modes based on the direction of power flow

18-17 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface EMI: Conducted Interefence Common and differential modes

18-18 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Switching Waveforms Typical rise and fall times

18-19 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Conducted EMI Various Standards

18-20 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 18 Utility Interface Conducted EMI Filter arrangement