Multiple modular DC transformer for flexible HVDC application

Abstract

This study proposes a novel multiple modular dc transformer (MMDCT) scheme for flexible high-voltage dc (HVDC) application. The MMDCT is composed of n consistent modular dual-active-bridge converters (MDABs), and every MDAB can work independently. The MDABs are series connected and also connects to the HVDC bus. The multiple distributed design decreases the manufacturing difficulty in high-frequency transformer and its installation. Besides, modular discrete design decreases commissioning difficulty of system in practice and also increases reliability and fault-treatment ability. Moreover, the MMDCT still has good soft-switching performance and low operation current for switches. The MMDCT is a practical scheme for HVDC application, and it will be welcomed by engineers.

Keywords

• HVDC power convertors
• HVDC power transmission
• high-frequency transformers
• power transformers
• power transmission reliability
• bridge circuits
• flexible HVDC application
• MMDCT
• n consistent modular dual-active-bridge converters
• MDAB
• HVDC bus
• multiple distributed design
• high-frequency transformer
• modular discrete design
• high-voltage DC application
• multiple modular DC transformer scheme