TY - GEN
T1 - A Hybrid Discontinuous PWM Neutral Point Balance Method Based on Zero-Sequence Component for Three-Level NPC Converter
AU - Zhang, Haochen
AU - Zheng, Weilin
AU - Yu, Yanxue
AU - Li, Haoyu
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/8
Y1 - 2019/8
N2 - Three-level NPC converters are widely used in electric vehicles and new energy power applications. NPC converter has the inherent problem of neutral point imbalance, and switching loss becomes a major component of total loss in medium and high power applications. The ability of DPWMs to reduce switching loss is weakened with existing control methods. In order to solve above problems, a DPWM neutral balance method based on zero-sequence voltage is introduced. The method calculates the required zero-sequence voltage according to the neutral point voltage and the current and voltage on AC side, and uses two DPWM modes with opposite effects on the neutral point through hysteresis control to achieve the balance without changing original DPWMs. The proposed method does not reduce the switching loss reduction performance, and improves the speed of adjusting DC-link capacitors voltage. This method can achieve neutral point balance under all modulation indexes. Simulation results demonstrate the effectiveness of the proposed method.
AB - Three-level NPC converters are widely used in electric vehicles and new energy power applications. NPC converter has the inherent problem of neutral point imbalance, and switching loss becomes a major component of total loss in medium and high power applications. The ability of DPWMs to reduce switching loss is weakened with existing control methods. In order to solve above problems, a DPWM neutral balance method based on zero-sequence voltage is introduced. The method calculates the required zero-sequence voltage according to the neutral point voltage and the current and voltage on AC side, and uses two DPWM modes with opposite effects on the neutral point through hysteresis control to achieve the balance without changing original DPWMs. The proposed method does not reduce the switching loss reduction performance, and improves the speed of adjusting DC-link capacitors voltage. This method can achieve neutral point balance under all modulation indexes. Simulation results demonstrate the effectiveness of the proposed method.
KW - discontinuous PWM (DPWM)
KW - neutral point balance
KW - switching losses
KW - zero sequence component
UR - https://www.scopus.com/pages/publications/85077114559
U2 - 10.1109/ICEMS.2019.8922291
DO - 10.1109/ICEMS.2019.8922291
M3 - 会议稿件
AN - SCOPUS:85077114559
T3 - 2019 22nd International Conference on Electrical Machines and Systems, ICEMS 2019
BT - 2019 22nd International Conference on Electrical Machines and Systems, ICEMS 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 22nd International Conference on Electrical Machines and Systems, ICEMS 2019
Y2 - 11 August 2019 through 14 August 2019
ER -