Solid-state transformer having uninterrupted operation ability under AC/DC fault and control method thereof

US11431263B2 · kind B2 · utility

Assignee

• Shanghai Jiao Tong University · CN

Inventors

• Jianwen ZHANG · Suzhou, CN
• Yixin Zhang · Dresden, DE
• Weixin FANG · Shanghai, CN
• Jianqiao Zhou · Shanghai, CN
• Gang Shi · Beijing, CN
• Xu Cai · Shanghai, CN
• Jiacheng Wang · Nanjing, CN

Key dates

• Filing date: Feb 9, 2022
• Grant date: Aug 30, 2022
• Expiry date: Feb 9, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M1/007
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Disclosed is a solid-state transformer having an uninterrupted operation ability under an AC/DC fault, in which bridge arms of a hybrid modular multilevel converter include half-bridge submodules and full-bridge submodules. The half-bridge submodules and the full-bridge submodules are connected with input ends of isolated dual-active-bridge converters via DC capacitors of the half-bridge submodules and full-bridge submodules; output ends of the isolated dual-active-bridge converters are connected in parallel to form a low-voltage DC bus; and a three-phase full-bridge inverter is connected to the low-voltage DC bus. The solid-state transformer may be provided with four ports including a medium-voltage AC port, a medium-voltage DC port, a low-voltage DC port and a low-voltage AC port which are beneficial to the interconnection of multi-voltage-level and multi-form AC/DC hybrid distribution grids. The solid-state transformer has the uninterrupted operation ability under the AC/DC fault.