Dr. Prasad Enjeti, Department of Electrical & Computer Engineering, Texas A&M University http://www.ece.tamu.edu/People/bios/benjetip.html ECEN 613 Rectifiers & Inverters ECEN 613 Rectifier & Inverter Circuits Professor: Dr. P. Enjeti with Michael T. Daniel Rm. 024, WEB Email: [email protected][email protected]Textbook: Power Electronics – Converters, Applications & Design (Third edition), by: Ned Mohan et al., John Wiley COURSE WEBPAGE: http://eCampus.tamu.edu Module-10b 1
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Dr. Prasad Enjeti, Department of Electrical & Computer Engineering, Texas A&M University
• Voltage source inverter (VSI) is a buck type converter – ac output voltage is limited and cannot exceed the dc-link
• VSI cannot tolerate short circuits – dead time between the gating of upper and lower switches need to be provided
• Three switches are on at any given instant
• VSI can supply multiple loads
• Output voltage in PWM and exhibits high dv/dt. In the case of long motor leads, voltage reflections cause over voltages at the motor terminals. Furthermore,
high dv/dt and common mode voltages contributes to ground currents and bearing fluting
Dr. Prasad Enjeti, Department of Electrical & Computer Engineering, Texas A&M University
Reference: P. Enjeti, P.D. Ziogas, J.F. Lindsay, “A current source PWM inverter with instantaneous current control capability”, IEEE Transactions on Industry Applications,
May/June 1991, pp 582-588
Advantages & Disadvantages
• CSI is a boost type converter
• Load voltage and current are sinusoidal (v.low THD) & no dv/dt issues.
• Reverse voltage blocking switches are needed
• Can tolerate short circuits
• No load operation / open circuit of the load is not possible
• Applicable for single or dedicated load
• Only two switches are on at any given instant
Current Source Inverter Operation
Dr. Prasad Enjeti, Department of Electrical & Computer Engineering, Texas A&M University