TY - JOUR
T1 - On the Redundancy Strategies of Modular Multilevel Converters
AU - Farias, Joao Victor Matos
AU - Cupertino, Allan Fagner
AU - Pereira, Heverton Augusto
AU - Junior, Seleme Isaac Seleme
AU - Teodorescu, Remus
PY - 2018/4/1
Y1 - 2018/4/1
N2 - The modular multilevel converters (MMCs) have become an attractive topology in recent years. The MMC has been employed in several applications as HVdc, energy storage, renewable energy, electrical drives, and static synchronous compensators (STATCOMs). One advantage of MMC-based topologies is the inherited fault-Tolerant operation associated with the high number of submodules (SMs). This work proposes the study of four redundancy strategies, which can be employed in modular multilevel converters: standard redundancy, redundancy strategy based on additional submodules (RAS), redundancy strategy based on additional submodules optimized (RASO), and redundancy strategy based on spare submodules. These strategies are compared through a case study of a 15 MVA MMC STATCOM. A new approach for the SM capacitance design is proposed, including the effect of the negative sequence current in the converter storage energy variations. The comparisons of the redundancy strategies are accomplished based on dynamic behavior, capacitor voltage balancing, control complexity, and power losses. Finally, the advantages and drawbacks of each redundancy strategy are presented.
AB - The modular multilevel converters (MMCs) have become an attractive topology in recent years. The MMC has been employed in several applications as HVdc, energy storage, renewable energy, electrical drives, and static synchronous compensators (STATCOMs). One advantage of MMC-based topologies is the inherited fault-Tolerant operation associated with the high number of submodules (SMs). This work proposes the study of four redundancy strategies, which can be employed in modular multilevel converters: standard redundancy, redundancy strategy based on additional submodules (RAS), redundancy strategy based on additional submodules optimized (RASO), and redundancy strategy based on spare submodules. These strategies are compared through a case study of a 15 MVA MMC STATCOM. A new approach for the SM capacitance design is proposed, including the effect of the negative sequence current in the converter storage energy variations. The comparisons of the redundancy strategies are accomplished based on dynamic behavior, capacitor voltage balancing, control complexity, and power losses. Finally, the advantages and drawbacks of each redundancy strategy are presented.
KW - Modular multilevel converter
KW - positive and negative sequence injection
KW - power losses
KW - redundancy strategies
UR - http://www.scopus.com/inward/record.url?scp=85044338811&partnerID=8YFLogxK
U2 - 10.1109/TPWRD.2017.2713394
DO - 10.1109/TPWRD.2017.2713394
M3 - Journal article
AN - SCOPUS:85044338811
SN - 0885-8977
VL - 33
SP - 851
EP - 860
JO - IEEE Transactions on Power Delivery
JF - IEEE Transactions on Power Delivery
IS - 2
ER -