A Multiport Power Electronic Transformer Based on Three-Phase Four-Arm Full-bridge Modular Multilevel Converter
Artikel i vetenskaplig tidskrift, 2024

This paper presents a multiport power electronic transformer (PET) based on a three-phase four-arm full-bridge modular multilevel converter (MMC), which is suitable for the hybrid AC/DC distribution grid because it can provide four ports, including medium-voltage AC and DC ports, low voltage DC and AC ports. Compared with the conventional MMC-based PET, which adopts three-phase six arms MMC with full-bridge submodules (FBSMs), the proposed PET uses three-phase four arms MMC with FBSMs, which can reduce the number of submodules. Meanwhile, the modulation index can be increased and the DC-bus voltage utilization can be improved. In addition, the concentrated capacitor on the medium-voltage DC port is eliminated in the proposed PET, so high transient discharging current from the concentrated capacitor can be avoided under the DC-bus short-circuit condition. The operating principle, applied control strategy and PWM scheme are presented in detail. The proposed PET is investigated and simulated in a hybrid 10 kV AC/±10 kV DC distribution grid. A scale down experimental test is also performed. Simulation and experimental results confirm the feasibility and validity of the proposed PET and control method.

Power electronics

Topology

Voltage

DC-bus short-circuit protection

Power electronic transformer

Capacitors

modular multilevel converter

hybrid AC/DC distribution grid

modulation index

Protection

Transformers

Modulation

Författare

Sizhao Lu

Kunming University of Science and Technology

Jian Deng

Kunming University of Science and Technology

Siqi Li

Kunming University of Science and Technology

Yumeng Shao

Student vid Chalmers

Kai Li

Beijing Jiaotong University

IEEE Transactions on Power Electronics

0885-8993 (ISSN) 19410107 (eISSN)

Vol. In Press

Ämneskategorier

Annan elektroteknik och elektronik

DOI

10.1109/TPEL.2024.3438440

Mer information

Senast uppdaterat

2024-08-28