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

fYear

2009

fDate

Sept. 27 2009-Oct. 1 2009

Firstpage

9

Lastpage

18

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Conference, 2009. COBEP '09. Brazilian

Conference_Location

Bonito-Mato Grosso do Sul

ISSN

2175-8603

Print_ISBN

978-1-4244-3369-8

Electronic_ISBN

2175-8603

Type

conf

DOI

10.1109/COBEP.2009.5347594

Filename

5347594