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

2. 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

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

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

5. 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

6. 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

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

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

9. 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

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

11. 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

12. 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

13. 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

14. 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

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

16. 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

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

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

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

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