Third-Harmonic-Type Modulation Minimizing the DC-Link Energy Storage Requirement of Isolated Phase-Modular Three-Phase PFC Rectifier Systems

A three-phase ac-dc converter with high-frequency isolation can be realized as a phase-modular system by using three single-phase Power Factor Correction (PFC) rectifier modules with isolated dc-dc converter output stages, which advantageously allows to cover a wide input voltage range by module rec...

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Bibliographic Details
Published in:IEEE access 2023, Vol.11, p.34359-34371
Main Authors: Langbauer, Thomas, Menzi, David, Marugg, Valentin, Vollmaier, Franz, Azurza, Jon, Kasper, Matthias, Kolar, Johann W.
Format: Article
Language:English
Subjects:
AC-DC converter
AC-DC converters
CM voltage injection
Control methods
Electrical measurement
Energy storage
harmonic injection
modular
Modular systems
Modulation
Modules
Power factor
Reconfiguration
Rectifiers
Reduction
three-phase
Topology
Voltage converters (DC to DC)
zero sequence
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Summary:A three-phase ac-dc converter with high-frequency isolation can be realized as a phase-modular system by using three single-phase Power Factor Correction (PFC) rectifier modules with isolated dc-dc converter output stages, which advantageously allows to cover a wide input voltage range by module reconfiguration from a star-(Y)- to a delta-([Formula Omitted])-arrangement. However, the main limitation of a phase-modular topology is the fact that the input power of each PFC rectifier module pulsates at twice the mains frequency such that large dc-link capacitors are required. Recent literature predicts a substantial single-phase power pulsation reduction enabled by means of third-(3 [Formula Omitted])-harmonic common-mode (CM) voltage (Y) or current ([Formula Omitted]) injection modulation. This paper experimentally verifies and extends the dc-link energy storage requirement reduction of the 3 [Formula Omitted]-harmonic injection modulation concepts: In a first step, the derivation of the harmonic injection concept is recapitulated and suitable control methods are discussed for both CM voltage (Y) and CM current ([Formula Omitted]) injection. Further, an alternative CM voltage injection strategy with simplified reference generation based only on the instantaneous grid voltage measurements is presented and compared to the pure 3 [Formula Omitted]-harmonic injection modulation. Measurement results obtained from a 6 kW prototype reveal a dc-link voltage variation and/or energy buffering reduction by up to 38.6 % enabled by the harmonic injection modulation compared to conventional operation without 3 [Formula Omitted]-harmonic injection modulation.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2023.3261243