Modular multilevel converters with embedded storage: simulation, analysis, and use for frequency support

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dc.contributor.authorHerath Mudiyanselage, Nuwan Madushanka Herath
dc.contributor.examiningcommitteePathirana, Vajira (Electrical and Computer Engineering)en_US
dc.contributor.examiningcommitteeGole, Aniruddha (Electrical and Computer Engineering)en_US
dc.contributor.examiningcommitteeDinavahi, Venkata (University of Alberta)en_US
dc.contributor.supervisorFilizadeh, Shaahin
dc.date.accessioned2022-08-09T20:11:32Z
dc.date.available2022-08-09T20:11:32Z
dc.date.copyright2022-08-04
dc.date.issued2022-08-04
dc.date.submitted2022-08-04T07:12:47Zen_US
dc.degree.disciplineElectrical and Computer Engineeringen_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.abstractModular multilevel converters with embedded storage (MMC-ES) have attracted the attention of researchers as a flexible converter of integrating energy storage to ac and dc networks using a single converter. Conventional EMT simulation methods are highly inefficient in simulating MMC-ES due to the large number of switching elements in the converter. Detailed equivalent model (DEM) have been developed in previous research that could efficiently simulate the MMC-ES, but are ineffective in mathematically analysing the converter. This thesis proposes a novel averaged-value model (AVM) to the MMC-ES multivalve, which simulates the converter based on multivalve averaged quantities. The model is capable of conducting general EMT simulations, and analytically estimating circulating currents and capacitor voltage ripple. The AVM is validated against detailed EMT simulation results, mathematical analysis, and laboratory prototype observations. The thesis also improves the AVM and DEM to simulate converter's blocking state and validates the models against detailed simulation model. A novel MMC-ES HVDC link startup procedure is also developed and verified. Two case studies are conducted to study the use of MMC-ES in providing extensive ancillary services and it is concluded that MMC-ES supported by dedicated measurement communication lines and conventional fast frequency response controllers could greatly improve network frequency response.en_US
dc.description.noteOctober 2022en_US
dc.description.sponsorshipMITACS/HATCHen_US
dc.identifier.urihttp://hdl.handle.net/1993/36670
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectModular multilevel converter with embedded storageen_US
dc.subjectElectromagnetic transient (EMT) simulationen_US
dc.subjectFrequency supporten_US
dc.subjectAncillary servicesen_US
dc.subjectSolar PVen_US
dc.titleModular multilevel converters with embedded storage: simulation, analysis, and use for frequency supporten_US
dc.typedoctoral thesisen_US
local.subject.manitobanoen_US
oaire.awardTitleUniversity of Manitoba Graduate felowshipen_US
oaire.awardURIhttps://umanitoba.ca/graduate-studies/funding-awards-and-financial-aid/university-manitoba-graduate-fellowship-umgfen_US
project.funder.identifierhttp://dx.doi.org/10.13039/100010318en_US
project.funder.nameUniversity of Manitoba Graduate Fellowshipen_US
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