PROJECT TITLE :
On the Redundancy Strategies of Modular Multilevel Converters - 2017
The modular multilevel converters (MMCs) became an enticing topology in recent years. The MMC has been utilized in several applications as HVdc, energy storage, renewable energy, electrical drives, and static synchronous compensators (STATCOMs). One advantage of MMC-primarily based topologies is that the inherited fault-tolerant operation related to the high variety of submodules (SMs). This work proposes the study of 4 redundancy ways, which will be used in modular multilevel converters: commonplace redundancy, redundancy strategy primarily based on extra submodules (RAS), redundancy strategy based on extra submodules optimized (RASO), and redundancy strategy based on spare submodules. These ways are compared through a case study of a fifteen MVA MMC STATCOM. A brand new approach for the SM capacitance design is proposed, as well as the result of the negative sequence current in the converter storage energy variations. The comparisons of the redundancy ways are accomplished based mostly on dynamic behavior, capacitor voltage balancing, control complexity, and power losses. Finally, the advantages and downsides of every redundancy strategy are presented.
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