{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/132798"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/132798","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Inrush transient generation and line impedance estimation","abstract":"An inrush transient contains extensive information that permits load identification, condition monitoring, and line impedance estimation. A power system monitor's (PSM) ability to identify a load based on its inrush behavior depends on the training exemplars used to create and optimize the load identification algorithm. This work discusses the use a phase-controlled switch that can be used in situ to integrate the effects of source and line impedance into the inrush data, and to generate transients at controllable turn-on phase angles relative to the voltage line-cycle. The resulting exemplars are more realistic than those generated with conventional techniques such as testing with an AC power supply. The control over angle also enables efficient investigation of a load's transient variability space. Testing loads in fault conditions expands the variability space, allowing load identification algorithms to correctly identify faulty loads and perform diagnostics. The large, high-frequency current that inrush transients inject into the line provides excellent excitation for line impedance estimation. Previous switching based approaches focus on fitting the line impedance to a model, i.e. parametric impedance estimation. This thesis extends previous work by providing the current excitation with common electrical loads rather than using capacitors, inductors, and short circuits. Non-parametric impedance estimation is also demonstrated. Inrush transients, and other transients generated by switching the load on and off rapidly, generate current with wide-bandwidth spectral content to replace previously used sinusoidal injection sweeps.","abstract_html":"An inrush transient contains extensive information that permits load identification, condition monitoring, and line impedance estimation. A power system monitor's (PSM) ability to identify a load based on its inrush behavior depends on the training exemplars used to create and optimize the load identification algorithm. This work discusses the use a phase-controlled switch that can be used in situ to integrate the effects of source and line impedance into the inrush data, and to generate transients at controllable turn-on phase angles relative to the voltage line-cycle. The resulting exemplars are more realistic than those generated with conventional techniques such as testing with an AC power supply. The control over angle also enables efficient investigation of a load's transient variability space. Testing loads in fault conditions expands the variability space, allowing load identification algorithms to correctly identify faulty loads and perform diagnostics. The large, high-frequency current that inrush transients inject into the line provides excellent excitation for line impedance estimation. Previous switching based approaches focus on fitting the line impedance to a model, i.e. parametric impedance estimation. This thesis extends previous work by providing the current excitation with common electrical loads rather than using capacitors, inductors, and short circuits. Non-parametric impedance estimation is also demonstrated. Inrush transients, and other transients generated by switching the load on and off rapidly, generate current with wide-bandwidth spectral content to replace previously used sinusoidal injection sweeps.","abstract_has_math":false,"creators":["Saathoff, Erik K. (Erik Karl)"],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science","school":null,"contributors":[],"advisors":["Steven B. Leeb."],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021","date_published":"2021","updated_at":"2026-07-22T22:22:10Z","subjects":["Electrical Engineering and Computer Science."],"languages":["eng"],"rights":["MIT theses may be protected by copyright. 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A power system monitor's (PSM) ability to identify a load based on its inrush behavior depends on the training exemplars used to create and optimize the load identification algorithm. This work discusses the use a phase-controlled switch that can be used in situ to integrate the effects of source and line impedance into the inrush data, and to generate transients at controllable turn-on phase angles relative to the voltage line-cycle. The resulting exemplars are more realistic than those generated with conventional techniques such as testing with an AC power supply. The control over angle also enables efficient investigation of a load's transient variability space. Testing loads in fault conditions expands the variability space, allowing load identification algorithms to correctly identify faulty loads and perform diagnostics. The large, high-frequency current that inrush transients inject into the line provides excellent excitation for line impedance estimation. Previous switching based approaches focus on fitting the line impedance to a model, i.e. parametric impedance estimation. This thesis extends previous work by providing the current excitation with common electrical loads rather than using capacitors, inductors, and short circuits. Non-parametric impedance estimation is also demonstrated. Inrush transients, and other transients generated by switching the load on and off rapidly, generate current with wide-bandwidth spectral content to replace previously used sinusoidal injection sweeps."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["Inrush transient generation and line impedance estimation"]}]}],"canonical_facts":{"dc:contributor.advisor":["Steven B. Leeb."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science","EECS"],"dc:contributor.other":["Massachusetts Institute of Technology. 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This work discusses the use a phase-controlled switch that can be used in situ to integrate the effects of source and line impedance into the inrush data, and to generate transients at controllable turn-on phase angles relative to the voltage line-cycle. The resulting exemplars are more realistic than those generated with conventional techniques such as testing with an AC power supply. The control over angle also enables efficient investigation of a load's transient variability space. Testing loads in fault conditions expands the variability space, allowing load identification algorithms to correctly identify faulty loads and perform diagnostics. The large, high-frequency current that inrush transients inject into the line provides excellent excitation for line impedance estimation. Previous switching based approaches focus on fitting the line impedance to a model, i.e. parametric impedance estimation. 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