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A Transformerless Energy Storage System Based on a Cascade Multilevel PWM Converter With Star Configuration

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3 Author(s)
Maharjan, L. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo ; Inoue, S. ; Akagi, H.

This paper describes a transformerless energy storage system based on a cascade multilevel pulsewidth modulation converter with star configuration. The system is intended for power leveling of renewable energy sources, as well as for improving power quality and reliability of a power distribution system. This paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the energy storage system. A 200-V 10-kW 8.8-kJ downscaled laboratory system is designed, constructed, and tested, replacing electric double-layer capacitors with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory system verify the viability and effectiveness of the 6.6-kV energy storage system.

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Industry Applications, IEEE Transactions on  (Volume:44 ,  Issue: 5 )