TY - JOUR
T1 - Optimal Neutral-Point Voltage Balancing Algorithm for Three-Phase Three-Level Converters with Hybrid Zero-Sequence Signal Injection and Virtual Zero-Level Modulation
AU - Wang, Jun
AU - Yuan, Xibo
AU - Dagan, Kfir J.
AU - Bloor, Andrew
N1 - Publisher Copyright:
© 1972-2012 IEEE.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - This article presents an optimal carrier-based voltage balancing scheme for three-phase three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e., zero-sequence signal injection and virtual zero-level modulation (VZM), to eliminate the low-frequency neutral-point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses, and output harmonics. The main drawbacks of VZM, i.e., the increased switching loss and high-frequency harmonics due to additional switching transitions, have been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.
AB - This article presents an optimal carrier-based voltage balancing scheme for three-phase three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e., zero-sequence signal injection and virtual zero-level modulation (VZM), to eliminate the low-frequency neutral-point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses, and output harmonics. The main drawbacks of VZM, i.e., the increased switching loss and high-frequency harmonics due to additional switching transitions, have been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.
KW - DC-AC power converters
KW - pulsewidth modula-tion
KW - three-level converters
KW - voltage balancing
UR - http://www.scopus.com/inward/record.url?scp=85089191068&partnerID=8YFLogxK
U2 - 10.1109/TIA.2020.2983659
DO - 10.1109/TIA.2020.2983659
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AN - SCOPUS:85089191068
SN - 0093-9994
VL - 56
SP - 3865
EP - 3878
JO - IEEE Transactions on Industry Applications
JF - IEEE Transactions on Industry Applications
IS - 4
M1 - 9052463
ER -