Title :
A Transformerless Energy Storage System Based on a Cascade Multilevel PWM Converter With Star Configuration
Author :
Maharjan, Laxman ; Inoue, Shigenori ; Akagi, Hirofumi
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo
Abstract :
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.
Keywords :
PWM power convertors; cascade systems; electrolytic capacitors; power control; power distribution reliability; power supply quality; renewable energy sources; voltage control; active-power control; cascade multilevel PWM converter; energy 8.8 kJ; large-capacity electrolytic capacitors; power 10 kW; power distribution system reliability; power leveling; power quality; pulsewidth modulation; renewable energy sources; star configuration; transformerless energy storage system; voltage 200 V; voltage 6.6 kV; voltage-balancing control; Control systems; Energy storage; Laboratories; Power distribution; Power quality; Power system reliability; Pulse width modulation converters; Renewable energy resources; Supercapacitors; Voltage control; Active-power control; cascade multilevel pulsewidth-modulation (PWM) converter; electric double-layer capacitor (EDLC); energy storage system; output-power leveling; renewable energy sources; voltage-balancing control;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2008.2002180
