Design of LCL-filters for grid-connected voltage source inverters

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dc.contributor.advisorHanif, Moinen_ZA
dc.contributor.authorJayalath, Sampathen_ZA
dc.date.accessioned2016-07-21T14:02:38Z
dc.date.available2016-07-21T14:02:38Z
dc.date.issued2016en_ZA
dc.description.abstractLCL-filters are preferred over conventional L-filters for grid-connected voltage source inverters (VSI) due to their superior harmonic attenuation, smaller filter size and weight. The LCL-filter design process is complex and takes an iterative approach due to the coherence between the filter parameters and design requirements. The main aim of this thesis is to analyse different design variables that contribute to an efficient LCL-filter. The study carried out, falls under two sections. The first study was to understand the importance of ratio between the grid-side and inverter-side inductors, resonance frequency, reactive power production and attenuation of higher order harmonics in an LCL-filter. Based on the analysis, this thesis proposes a generalised LCL-filter design algorithm which avoids uncertainty in determining resonance frequency as the exact position of the resonance frequency is determined based on the design requirements. The proposed design method considers the LCL-filter as a single filtering unit rather than individual filtering contributions from passive components. The second study is extended to understand the limits of passive components based on the reactive power production limits (based on control structure), IEEE-519 harmonic limitations and the allowable switching losses or voltage drop across the entire filter. Based on the analysis, the thesis proposes an optimum operating point for an LCL-filter where the minimum inductance is realised to meet IEEE-519 harmonic current limitations for a given reactive power production while ensuring reasonable switching losses. Simulations and experimental results are presented to demonstrate the efficacy of the proposed two methods in terms of total harmonic distortion, harmonic attenuation and reactive power compensated.[Please note: This thesis file has been deferred until December 2016]en_ZA
dc.identifier.apacitationJayalath, S. (2016). <i>Design of LCL-filters for grid-connected voltage source inverters</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/20579en_ZA
dc.identifier.chicagocitationJayalath, Sampath. <i>"Design of LCL-filters for grid-connected voltage source inverters."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2016. http://hdl.handle.net/11427/20579en_ZA
dc.identifier.citationJayalath, S. 2016. Design of LCL-filters for grid-connected voltage source inverters. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jayalath, Sampath AB - LCL-filters are preferred over conventional L-filters for grid-connected voltage source inverters (VSI) due to their superior harmonic attenuation, smaller filter size and weight. The LCL-filter design process is complex and takes an iterative approach due to the coherence between the filter parameters and design requirements. The main aim of this thesis is to analyse different design variables that contribute to an efficient LCL-filter. The study carried out, falls under two sections. The first study was to understand the importance of ratio between the grid-side and inverter-side inductors, resonance frequency, reactive power production and attenuation of higher order harmonics in an LCL-filter. Based on the analysis, this thesis proposes a generalised LCL-filter design algorithm which avoids uncertainty in determining resonance frequency as the exact position of the resonance frequency is determined based on the design requirements. The proposed design method considers the LCL-filter as a single filtering unit rather than individual filtering contributions from passive components. The second study is extended to understand the limits of passive components based on the reactive power production limits (based on control structure), IEEE-519 harmonic limitations and the allowable switching losses or voltage drop across the entire filter. Based on the analysis, the thesis proposes an optimum operating point for an LCL-filter where the minimum inductance is realised to meet IEEE-519 harmonic current limitations for a given reactive power production while ensuring reasonable switching losses. Simulations and experimental results are presented to demonstrate the efficacy of the proposed two methods in terms of total harmonic distortion, harmonic attenuation and reactive power compensated.[Please note: This thesis file has been deferred until December 2016] DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Design of LCL-filters for grid-connected voltage source inverters TI - Design of LCL-filters for grid-connected voltage source inverters UR - http://hdl.handle.net/11427/20579 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20579
dc.identifier.vancouvercitationJayalath S. Design of LCL-filters for grid-connected voltage source inverters. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20579en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleDesign of LCL-filters for grid-connected voltage source invertersen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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