TY - GEN
T1 - Analysis and Control of Neutral Point Current Deviation in Grid Tied 3-level NPC Converter under Various Grid Unbalanced Conditions
AU - Choi, Jaehoon
AU - Suh, Yongsug
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/11/29
Y1 - 2020/11/29
N2 - This paper introduces analysis and control method regarding the variation of neutral point current in a grid tied 3-level NPC converter under various grid unbalanced operating conditions. Various faults cases having both unbalanced amplitude and phase are systematically categorized and described using the unified metric called imbalance factor. The fundamental component of neutral point current is generated under grid imbalance cases. The pattern and behavior of this fundamental component of neutral point current highly depends on the imbalance factor irrespective of the particular type of grid fault cases. The control scheme of regulating the negative sequential component of ac input current effectively reduces the size of fundamental component of neutral point current under the wide range of grid imbalance. The control scheme would make the operation of a grid tied 3-level NPC converter more reliable and stable under various types of grid faults.
AB - This paper introduces analysis and control method regarding the variation of neutral point current in a grid tied 3-level NPC converter under various grid unbalanced operating conditions. Various faults cases having both unbalanced amplitude and phase are systematically categorized and described using the unified metric called imbalance factor. The fundamental component of neutral point current is generated under grid imbalance cases. The pattern and behavior of this fundamental component of neutral point current highly depends on the imbalance factor irrespective of the particular type of grid fault cases. The control scheme of regulating the negative sequential component of ac input current effectively reduces the size of fundamental component of neutral point current under the wide range of grid imbalance. The control scheme would make the operation of a grid tied 3-level NPC converter more reliable and stable under various types of grid faults.
KW - 3-level NPC(Neutral Point Clamped) converter
KW - Neutral point current
KW - Unbalanced grid voltage
UR - https://www.scopus.com/pages/publications/85103202430
U2 - 10.1109/IPEMC-ECCEAsia48364.2020.9368222
DO - 10.1109/IPEMC-ECCEAsia48364.2020.9368222
M3 - Conference paper
AN - SCOPUS:85103202430
T3 - 2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
SP - 710
EP - 716
BT - 2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
Y2 - 29 November 2020 through 2 December 2020
ER -