TY - GEN
T1 - Conditions for capacitor voltage regulation in a five-level cascade multilevel inverter
T2 - IEEE International Electric Machines and Drives Conference, IEMDC 2007
AU - Chiasson, John
AU - Özpineci, Burak
AU - Du, Zhong
AU - Tolbert, Leon M.
PY - 2007
Y1 - 2007
N2 - A cascade multilevel inverter is a power electronic device built to synthesize a desired AC voltage from several levels of DC voltages. Such inverters have been the subject of research in the last several years, where the DC levels were considered to be identical in that all of them were either batteries, solar cells, etc. Similar to previous results in the literature, the work here shows how a cascade multilevel inverter can be used to obtain a voltage boost at higher speeds for a three-phase PM drive using only a single DC voltage source. The input of a standard three-leg inverter is connected to the DC source and the output of each leg is fed through an H-bridge (which is supplied by a capacitor) to form a cascade multilevel inverter. A fundamental switching scheme is used, which achieves the fundamental in the output voltage while eliminating the fifth harmonic. A new contribution in this paper is the development of explicit conditions in terms of the power factor and modulation index for which the capacitor voltage of the H-bridges can be regulated while simultaneously maintaining the aforementioned output voltage. This is then used for a PM motor drive showing the machine can attain higher speeds due to the higher output voltage of the multilevel inverter compared to using just a three-leg inverter.
AB - A cascade multilevel inverter is a power electronic device built to synthesize a desired AC voltage from several levels of DC voltages. Such inverters have been the subject of research in the last several years, where the DC levels were considered to be identical in that all of them were either batteries, solar cells, etc. Similar to previous results in the literature, the work here shows how a cascade multilevel inverter can be used to obtain a voltage boost at higher speeds for a three-phase PM drive using only a single DC voltage source. The input of a standard three-leg inverter is connected to the DC source and the output of each leg is fed through an H-bridge (which is supplied by a capacitor) to form a cascade multilevel inverter. A fundamental switching scheme is used, which achieves the fundamental in the output voltage while eliminating the fifth harmonic. A new contribution in this paper is the development of explicit conditions in terms of the power factor and modulation index for which the capacitor voltage of the H-bridges can be regulated while simultaneously maintaining the aforementioned output voltage. This is then used for a PM motor drive showing the machine can attain higher speeds due to the higher output voltage of the multilevel inverter compared to using just a three-leg inverter.
UR - http://www.scopus.com/inward/record.url?scp=35048815518&partnerID=8YFLogxK
U2 - 10.1109/IEMDC.2007.382758
DO - 10.1109/IEMDC.2007.382758
M3 - Conference contribution
AN - SCOPUS:35048815518
SN - 1424407435
SN - 9781424407439
T3 - Proceedings of IEEE International Electric Machines and Drives Conference, IEMDC 2007
SP - 731
EP - 735
BT - Proceedings of 2007 IEEE International Electric Machines and Drives Conference, IEMDC 2007
Y2 - 3 May 2007 through 5 May 2007
ER -