Ch18

Chapter 18 Utility Interface

• Power quality has become an important issue 18-1

Various Loads Supplied by the Utility Source

• PCC is the point of common coupling 18-2

Diode-Rectifier Bridge

• Bock diagram 18-3

Typical Harmonics in the Input Current

• Single-phase diode-rectifier bridge 18-4

Harmonic Guidelines: IEEE 519

• commonly used for specifying limits on the input current distortion 18-5

Harmonic Guidelines: IEEE 519

• Limits on distortion in the input voltage supplied by the utility 18-6

Reducing the Input Current Distortion

• use of passive filters 18-7

Power-Factor-Correction (PFC) Circuit

• For meeting the harmonic guidelines 18-8

Power-Factor-Correction (PFC) Circuit Control

• generating the switch on/off signals 18-9

Power-Factor-Correction (PFC) Circuit

• Operation during each half-cycle 18-10

Thyristor Converters for 4-Quadrant Operation

• Two back-to-back connected 2-quadrant converters 18-11

Switch-Mode Converter Interface

• Bi-directional power flow; unity PF is possible 18-12

Switch-Mode Converter Interface

• Rectifier and Inverter modes based on the direction of power flow 18-13

Switch-Mode Converter Control

• DC bus voltage is maintained at the reference value 18-14

Switch-Mode Converter Interface

• Waveforms in the rectifier mode 18-15

3-Phase Switch-Mode Converter Interface

• Rectifier and Inverter modes based on the direction of power flow 18-16

EMI: Conducted Interefence

• Common and differential modes 18-17

Switching Waveforms

• Typical rise and fall times 18-18

Conducted EMI

• Various Standards 18-19

Conducted EMI

• Filter arrangement 18-20