Design of 2MW/10kV cascaded power conversion system

• Published in: IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society pp. 4250 - 4255
• Main Authors: Ling Zhi-Bin, Cao Yang, Ma Qin-Dong, Guo Hai-Feng, Zhang Bai-hua, Lu Zhi-Gang
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-10-2014
• Subjects: Batteries; Batteries Energy storage; Capacitors; Distributed power generation; Inductors; Insulated gate bipolar transistors; Power control; Power conversion; power dissipation; Power system stability; Pulse width modulation converters; Smart grids; Switching frequency
• ISSN: 1553-572X
• DOI: 10.1109/IECON.2014.7049141

Cascaded power conversion system was used in battery energy storage system. It can be connected to medium-voltage grid directly and expanded to larger capacity easily. Without 50Hz booster transformer, medium voltage cascaded power conversion system can reduce power loss. In 2011, the China Southern Power Grid launched the project of 2MW/10kV battery energy storage system. In this paper, the design requirement of the cascaded power conversion system, main circuit topology and power unit topology were described. Then parameters of key part were designed, and power loss was analyzed. Besides, a prototype was built to verify the feasibility of the design.