Resonant-type architectures for active power decoupling in grid-tied single-phase power electronics
Brooks, Nathan C.
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https://hdl.handle.net/2142/101104
Description
Title
Resonant-type architectures for active power decoupling in grid-tied single-phase power electronics
Author(s)
Brooks, Nathan C.
Issue Date
2018-04-27
Director of Research (if dissertation) or Advisor (if thesis)
Pilawa-Podgurski, Robert C.N.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
single-phase, power decoupling, active energy buffer, twice-line frequency, efficiency, resonant buffer, series-stacked buffer
Abstract
In single-phase power converters, twice-line frequency power decoupling circuits are used to buffer the instantaneous energy difference between the AC and DC sides of the converter. Active buffer implementations are used to reduce the volume and potentially improve the reliability of the converter by redistributing passive energy storage requirements with combinations of switches, capacitors, and inductors.
This thesis applies resonant impedance behavior to the operation of a specific DC-side twice-line frequency buffer called a series-stacked buffer (SSB). Utilizing this equivalent impedance model, an appropriate voltage-control scheme is derived and experimentally validated. There is also additional consideration of energy performance metrics in the context of DC-side buffers. Furthermore, the SSB equivalent impedance model is extended, applied, and generalized to the full single-phase converter system. This analysis includes an integrated system control method which imposes phase-locking and consistent transient stability. Experimental verification of full system interconnectivity is validated with a 1.5 kW power factor correction (PFC) boost flying capacitor multilevel (FCML) converter.
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