EE 8407 Power Converter Systems Topic 8 Graduate

EE 8407 Power Converter Systems Topic 8 Graduate Course EE 8407 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/ Ryerson Campus Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006 1

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

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

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

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

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

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

EE 8407 Multilevel Flying Capacitor Inverters 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; Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006 8

EE 8407 Multilevel Flying Capacitor Inverters Topic 8 • Switching State (five-level) Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006 9

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

EE 8407 Multilevel Flying Capacitor Inverters Topic 8 • Summary 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 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006 11

EE 8407 Topic 8 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006 12