Fault tolerant distributed control strategy for Modular Multilevel Converter in HVDC applications
Translated title
Fejl-tolerant distribueret styringstrategi for modulær multilevel konverter i HVDC applikationer
Author
Eni, Emanuel-Petre
Term
4. term
Education
Publication year
2013
Submitted on
2013-06-13
Pages
54
Abstract
Den modulære multilevel-konverter (MMC) er en nyere konverterteknologi, opbygget af mange gentagne byggeklodser kaldet delmoduler (SM’er). Den er lovende til højspændings-jævnstrøm (HVDC) transmissionssystemer, som overfører elektricitet over lange afstande med jævnstrøm, fordi den har lave tab, en modulær opbygning, kræver mindre filtrering og har god fejltolerance. Det store antal delmoduler gør klassisk, centraliseret styring vanskelig. Derfor anbefales en distribueret styring, hvor flere lokale controllere samarbejder. Det stiller krav om hurtig kommunikation og præcis synkronisering mellem modulerne. I dette projekt er et delmodul blevet designet, bygget og eksperimentelt valideret, så det opfylder opstartskrav og kan fungere sikkert under fejl (fejltolerant drift). Kommunikationssystemet blev implementeret med en Industrial Ethernet-protokol i realtid og kan omkonfigurere sig løbende under fejl. Fejltolerant drift og opstartsprocedurer er desuden valideret med en PSCAD-model i realistiske testscenarier.
The Modular Multilevel Converter (MMC) is a newer converter technology made up of many repeated building blocks called sub‑modules (SMs). It is well suited for high‑voltage direct current (HVDC) transmission, which sends electricity over long distances using direct current, because it has low losses, a modular design, lower filtering needs, and good fault tolerance. However, the large number of sub‑modules makes traditional centralized control challenging. A distributed control approach, where many local controllers coordinate their actions, is recommended. This requires fast communication and tight synchronization across modules. In this project, a sub‑module was designed, built, and experimentally validated to meet start‑up requirements and to operate safely under fault conditions (fault‑tolerant operation). The communication system was implemented using a real‑time Industrial Ethernet protocol and can reconfigure itself on the fly during faults. Fault‑tolerant operation and start‑up procedures were also validated using a PSCAD model in realistic test cases.
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