Title :
A battery energy storage system based on a multilevel cascade PWM converter
Author :
Akagi, Hirofumi ; Maharjan, Laxman
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan
fDate :
Sept. 27 2009-Oct. 1 2009
Abstract :
This paper describes a 6.6-kV battery energy storage system based on a multilevel cascade PWM (pulse-width-modulation) converter with star configuration. It discusses design concepts with and without a line-frequency transformer for grid connection. The control system consists of SOC(state-of-charge)-balancing control and fault-tolerant control. The former is indispensable for effective utilization of battery energy while the latter is required for maintaining continuous operation during a converter-cell or battery-unit fault. A 200-V, 10-kW, 3.6-kWh laboratory system combining a three-phase cascade PWM converter with nine NiMH (nickel-metal-hydride) battery units is designed, constructed, and tested to verify the validity and effectiveness of the proposed control system.
Keywords :
PWM power convertors; battery storage plants; nickel compounds; secondary cells; NiJkH; battery energy storage system; battery-unit fault; fault-tolerant control; grid connection; line-frequency transformer; multilevel cascade PWM converter; power 10 kW; pulse-width-modulation converter; state-of-charge-balancing control; voltage 200 V; voltage 6.6 kV; Batteries; Control systems; Energy storage; Fault tolerant systems; Motor drives; Power system stability; Pulse width modulation converters; Renewable energy resources; Voltage; Wind energy; BESS (battery energy storage system); SOC (state-of-charge) balancing; cascade converters; fault-tolerant control;
Conference_Titel :
Power Electronics Conference, 2009. COBEP '09. Brazilian
Conference_Location :
Bonito-Mato Grosso do Sul
Print_ISBN :
978-1-4244-3369-8
Electronic_ISBN :
2175-8603
DOI :
10.1109/COBEP.2009.5347594
