Презентация slides topic8

1 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 Power Converter Systems Graduate Course EE 8407 Ryerson Campus. Bin Wu Ph. D, PEng Professor ELCE Department Ryerson University Contact Info Office: ENG 328 Tel: (416) 979 -5000 ext: 6484 Email: bwu@ee. ryerson. ca http: //www. ee. ryerson. ca/~bwu/

2 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 Five-Level NPC/H-Bridge Inverter System with dual 18 -pulse rectifier LEDAR, Ryerson University Topic 8 Other Multilevel Voltage Source Converters

3 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 Lecture Topics • NPC/H-Bridge Inverters • Flying-Capacitor Inverters Other Multilevel Voltage Source Converters

4 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 Compared with three-level NPC Topology: — Voltage levels increases from three to five — Inverter output voltage and power are doubled — Device count is doubled • Five-Level Topology NPC/H-Bridge Inverters

5 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • IPD Modulation NPC/H-Bridge Inverters

6 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • Waveforms and FFT (Five Level) Inverter Phase Voltage Line-to-line Voltage. NPC/H-Bridge Inverters

7 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • Waveforms and FFT (Five Level) Frequency modulation index: m f = 18 NPC/H-Bridge Inverters

8 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • Five Level Topology Complementary Switch pairs: S 1 and S’ 1 ; S 2 and S’ 2 ; S 3 and S’ 3 ; S 4 and S’ 4 ; Multilevel Flying Capacitor Inverters

9 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • Switching State (five-level) Switching State Output Voltage ANV 1 S 2 S 3 S 4 S 4 E 1 1 0 0 1 1 3 E 1 1 0 1 1 1 0 0 1 1 0 2 E 0 1 1 0 0 1 0 1 E 0 0 0 1 0 0 0 Multilevel Flying Capacitor Inverters

10 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 • f sw (device) = 60( m f ) = 720 Hz • f sw (inverter) = 60(4 m f ) = 2880 Hz • Phase-Shifted PWM Multilevel Flying Capacitor Inverters

11 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic 8 Features — Low harmonic distortion with low dv/dt — Modular design Drawbacks — Large number of dc capacitors — Complex pre-charging circuits — Difficulties in dc cap voltage balancing control • Summary Multilevel Flying Capacitor Inverters

12 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley — IEEE Press, 2006 EE 8407 Topic