Abstract
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-( $\Delta $ )-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 $^{\mathrm{ rd}}$ )-harmonic common-mode (CM) voltage (Y) or current ( $\Delta $ ) injection modulation. This paper experimentally verifies and extends the dc-link energy storage requirement reduction of the 3 $^{\mathrm{ rd}}$ -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 ( $\Delta $ ) 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 $^{\mathrm{ rd}}$ -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 $^{\mathrm{ rd}}$ -harmonic injection modulation.
Originalsprache | englisch |
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Aufsatznummer | 10089233 |
Seiten (von - bis) | 34359-34371 |
Seitenumfang | 13 |
Fachzeitschrift | IEEE Access |
Jahrgang | 11 |
DOIs | |
Publikationsstatus | Veröffentlicht - 30 März 2023 |
Schlagwörter
- Rectifiers
- Voltage control
- Harmonic analysis
- Voltage measurement
- Power system harmonics
- DC-DC power converters
ASJC Scopus subject areas
- Allgemeiner Maschinenbau
- Allgemeine Materialwissenschaften
- Elektrotechnik und Elektronik
- Allgemeine Computerwissenschaft
Fields of Expertise
- Mobility & Production