Single-Stage Isolated and Bidirectional Three-Phase Series-Resonant AC–DC Converter: Modulation for Active and Reactive Power Control

Damian Sal y Rosas (), Daniel Chavez (), David Frey () and Jean-Paul Ferrieux
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Damian Sal y Rosas: GrEPO, CER-UNI, Universidad Nacional de Ingeniería, Lima 15333, Peru
Daniel Chavez: GrEPO, CER-UNI, Universidad Nacional de Ingeniería, Lima 15333, Peru
David Frey: G2Elab, CNRS, University Grenoble Alpes, F-38000 Grenoble, France
Jean-Paul Ferrieux: G2Elab, CNRS, University Grenoble Alpes, F-38000 Grenoble, France

Energies, 2022, vol. 15, issue 21, 1-29

Abstract: Single-stage isolated and bidirectional (SSIB) AC–DC converters have a high potential for future solid-state transformers and smart battery chargers due to their reduced volume and high efficiency. However, there is a research gap for SSIB reactive power injection. This article introduces an SSIB three-phase AC–DC converter composed of three low frequency rectifiers linked by tiny film capacitors with a quad-active-bridge series-resonant (QABSR) DC–DC. A novel QAB modulation is proposed to solve three issues: (1) Three DC inputs with high ripple compensation, (2) active–reactive power injection, and (3) minimization of high-frequency (HF) transformers currents. The rectified grid voltages were modulated by time-variant duty ratio (DR) angles. In contrast, the DC source was modulated by a fixed DR (FDR) angle along with a phase-shift angle which changes according to the grid current amplitude. A constant HF current amplitude with minimum value was obtained. It is shown that the HF current amplitude is increased for reactive power injection. Hence, the FDR angle was used to compensate for this increase. Active and reactive power control were validated in a 2 kW prototype. Compared with other structures, tiny DC-link capacitors and smaller L filters were used. Moreover, higher efficiency (96%) and smaller grid currents THDi (3%) were obtained.

Keywords: single-stage AC–DC converter; smart battery charges (SBC); reactive power; quad-active-bridge series-resonant (QABSR); solid-state transformer (SST); vehicle-to-grid (V2G) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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