Adaptive Phase Locked Loops for VSC connected to weak ac systems

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dc.contributor.authorBabu Narayanan, Mita
dc.contributor.examiningcommitteeZhang, Yi (Electrical and Computer Engineering) Leung, Carson (Computer Science)en_US
dc.contributor.supervisorGole, Aniruddha (Electrical and Computer Engineering)en_US
dc.date.accessioned2015-04-13T16:16:59Z
dc.date.available2015-04-13T16:16:59Z
dc.date.issued2015-04-13
dc.degree.disciplineElectrical and Computer Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThe performance of the High voltage dc systems is dependent on the stiffness of the ac bus, it is connected to. With the traditional synchronous reference frame-phase locked loops (SRF-PLL), voltage source converters (VSC) systems with large PLL gains, connected to weak ac networks are shown to be prone to instabilities, when subject to disturbances. In this thesis a new Adaptive PLL is designed with a pre-filter topology which extracts the fundamental positive sequence component of the input voltage, to be fed into the SRF-PLL for tracking of its phase angle. Compared with other traditional PLL topologies, this Adaptive PLL shows superior immunity to voltage distortions, and also has a faster dynamic performance. The thesis presents a comparative analysis of the performance of the traditional SRF-PLL with the Adaptive PLL in a VSC control system, and its impact on stability for VSCs connected to weak ac systems (up to SCR=1.3).en_US
dc.description.noteOctober 2015en_US
dc.identifier.urihttp://hdl.handle.net/1993/30385
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectVoltage Source Convertersen_US
dc.subjectHigh Voltage DC systemsen_US
dc.subjectPhase Locked Loopsen_US
dc.subjectShort Circuit Ratioen_US
dc.titleAdaptive Phase Locked Loops for VSC connected to weak ac systemsen_US
dc.typemaster thesisen_US
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