TY - GEN
T1 - Hybrid Unidirectional MMC-Based Rectifier
AU - Fuerback, Vinicius Bernardi
AU - De Sousa, Gean Jacques Maia
AU - Heldwein, Marcelo Lobo
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/7/2
Y1 - 2018/7/2
N2 - More-electric ships (MESs) and subsea oil processing electric power systems are typically fed by synchronous generators. These are primarily driven by gas turbines in the case of OG or diesel engines in MESs. In neither of these applications the generators should experience regenerative operation, i.e., they do not operate under reversed power flow. Medium voltage dc unidirectional rectifiers are well suited and provide natural protection against power flow reversals. Thus, a hybrid rectifier concept that is based on line commutated diodes to transfer a large portion of electric power allied with the redundancy and higher operating frequency of modular multilevel converter (MMC) submodules (SMs) is proposed. The hybrid rectifier operates the MMC SMs to synthesize waveforms that are ideally composed of triplen harmonics. Therefore, the frequency of the power oscillations at the capacitors are shifted to frequencies higher than those of a conventional MMC. The overall required capacitance is consequently reduced. Furthermore, a much lower number of SMs is required when compared to a conventional three-phase MMC. These characteristics are welcome in the cited applications. This work discusses how to operate and control the proposed system.
AB - More-electric ships (MESs) and subsea oil processing electric power systems are typically fed by synchronous generators. These are primarily driven by gas turbines in the case of OG or diesel engines in MESs. In neither of these applications the generators should experience regenerative operation, i.e., they do not operate under reversed power flow. Medium voltage dc unidirectional rectifiers are well suited and provide natural protection against power flow reversals. Thus, a hybrid rectifier concept that is based on line commutated diodes to transfer a large portion of electric power allied with the redundancy and higher operating frequency of modular multilevel converter (MMC) submodules (SMs) is proposed. The hybrid rectifier operates the MMC SMs to synthesize waveforms that are ideally composed of triplen harmonics. Therefore, the frequency of the power oscillations at the capacitors are shifted to frequencies higher than those of a conventional MMC. The overall required capacitance is consequently reduced. Furthermore, a much lower number of SMs is required when compared to a conventional three-phase MMC. These characteristics are welcome in the cited applications. This work discusses how to operate and control the proposed system.
KW - Unidirectional rectifier
KW - medium voltage direct current
KW - modular multilevel converters
KW - power factor correction
UR - http://www.scopus.com/inward/record.url?scp=85062868662&partnerID=8YFLogxK
U2 - 10.1109/SPEC.2018.8636041
DO - 10.1109/SPEC.2018.8636041
M3 - Conference contribution
AN - SCOPUS:85062868662
T3 - 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018
BT - 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 4th IEEE Southern Power Electronics Conference, SPEC 2018
Y2 - 10 December 2018 through 13 December 2018
ER -