TY - GEN
T1 - A cell capacitor energy balancing control of MMC-HVDC under the AC grid faults
AU - Jung, Jae Jung
AU - Cui, Shenghui
AU - Lee, Younggi
AU - Sul, Seung Ki
N1 - Publisher Copyright:
© 2015 Korean Institute of Power Electronics.
PY - 2015/7/27
Y1 - 2015/7/27
N2 - This paper presents the techniques for regulation of system balancing in modular multilevel converter (MMC) based HVDC system under the AC grid double line fault condition. Due to the special structure of MMC, the balancing of the cell capacitor voltage is crucial for any operating circumstance of the system. Also, the responses against the grid faults of HVDC system based on MMC are different to those based on the conventional voltage sourced converters. Therefore, even under the nonpermanent fault in AC grid, the balancing of the cell capacitor energy of MMC has to be guaranteed continuously. Among AC grid fault modes, the double line fault causes one of the most severe transients in MMC. In this paper, a balancing control method of MMC based on an offset voltage injection strategy in the output reference voltages is proposed. By the virtue of the proposed method, the HVDC system based on MMC can have the enhanced fault ride-through capability against the double line fault in AC grid. The validity of the proposed method is verified by simulation results of a ±200kV, 400MVA point-to-point HVDC system.
AB - This paper presents the techniques for regulation of system balancing in modular multilevel converter (MMC) based HVDC system under the AC grid double line fault condition. Due to the special structure of MMC, the balancing of the cell capacitor voltage is crucial for any operating circumstance of the system. Also, the responses against the grid faults of HVDC system based on MMC are different to those based on the conventional voltage sourced converters. Therefore, even under the nonpermanent fault in AC grid, the balancing of the cell capacitor energy of MMC has to be guaranteed continuously. Among AC grid fault modes, the double line fault causes one of the most severe transients in MMC. In this paper, a balancing control method of MMC based on an offset voltage injection strategy in the output reference voltages is proposed. By the virtue of the proposed method, the HVDC system based on MMC can have the enhanced fault ride-through capability against the double line fault in AC grid. The validity of the proposed method is verified by simulation results of a ±200kV, 400MVA point-to-point HVDC system.
KW - AC grid fault
KW - arm energy balancing
KW - double line fault
KW - modular multilevel converter
KW - voltage source converter based HVDC
UR - http://www.scopus.com/inward/record.url?scp=84961875629&partnerID=8YFLogxK
U2 - 10.1109/ICPE.2015.7167758
DO - 10.1109/ICPE.2015.7167758
M3 - Conference contribution
AN - SCOPUS:84961875629
T3 - 9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia
SP - 1
EP - 8
BT - 9th International Conference on Power Electronics - ECCE Asia
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th International Conference on Power Electronics - ECCE Asia, ICPE 2015-ECCE Asia
Y2 - 1 June 2015 through 5 June 2015
ER -