RT Conference Proceedings
T1 Enhancing the Natural Voltage Balancing Capability of Neutral-Point-Clamped Converters under Carrier-Based Pulsewidth Modulation
A1 Beniwal, Neha
A1 Pou, Josep
A1 Townsend, Christopher D.
A1 Ceballos, Salvador
AB In this paper, a new modulation technique is presented which aims to enhance the natural voltage balancing capability of neutral-point-clamped converters. The traditional carrier-based pulsewidth modulation technique with zero-sequence injection faces some drawbacks, namely, its inability to balance initial capacitor voltage imbalances quickly and the divergence of the capacitor voltages in the presence of nonlinear loads with even harmonics. This paper aims to find a trade-off between voltage balance performance and switching losses by reducing the difference between the average capacitor voltages without incorporating any external circuitry. A reference neutral-point (NP) current is generated using the average difference between the capacitor voltages. Depending on the reference NP current and predicted NP current, appropriate duty cycles are applied to switch the three phases. These duty cycles are directly linked to the voltage unbalance between the capacitor voltages and thus provides the necessary 'push' to mitigate deviations in natural balancing characteristics. To validate the proposed modulation technique, simulation results are presented for linear loads as well as for nonlinear loads with even harmonics.
PB Institute of Electrical and Electronics Engineers Inc.
SN 9781538682579
YR 2018
FD 2018-07-02
LK https://hdl.handle.net/11556/1812
UL https://hdl.handle.net/11556/1812
LA eng
NO Beniwal , N , Pou , J , Townsend , C D & Ceballos , S 2018 , Enhancing the Natural Voltage Balancing Capability of Neutral-Point-Clamped Converters under Carrier-Based Pulsewidth Modulation . in 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018 . , 8635951 , 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018 , Institute of Electrical and Electronics Engineers Inc. , 4th IEEE Southern Power Electronics Conference, SPEC 2018 , Singapore , Singapore , 10/12/18 . https://doi.org/10.1109/SPEC.2018.8635951
NO conference
NO Publisher Copyright: © 2018 IEEE.
NO ACKNOWLEDGMENT This work has been supported by the Basque Government within the Research program ELKARTEK under the project ENSOL (KK-2018/00040).
DS TECNALIA Publications
RD 28 jul 2024