A transformerless battery energy storage system based on a multilevel cascade PWM converter

Author

Maharjan, Laxman ; Inoue, Shigenori ; Akagi, Hirofumi ; Asakura, Jun

Author_Institution

Tokyo Inst. of Technol., Tokyo

fYear

2008

fDate

15-19 June 2008

Firstpage

4798

Lastpage

4804

Abstract

Renewable energy sources such as wind turbine generators and photovoltaics produce a fluctuating electric power. A battery energy storage system (BESS) should be installed in the vicinity of these sources. The fluctuating power is compensated by appropriately controlling an active power stored in the battery. This paper describes a feasible circuit configuration of a 6.6-kV transformerless battery energy storage system based on a multilevel cascade PWM (pulse-width-modulation) converter, with focus on a control method for active power and SOC (state-of- charge) balancing. A 200-V, 10-kW, 3.6-kWh (13-MJ) laboratory system combining a multilevel cascade PWM converter with nine NiMH (nickel metal hydride) battery units is designed, constructed, and tested to verify the viability and effectiveness of the 6.6-kV system.

Keywords

PWM power convertors; battery storage plants; nickel; power control; power system control; secondary cells; BESS; Ni; active power control; energy 13 MJ; feasible circuit configuration; multilevel cascade PWM converter; nickel metal hydride battery units; power 10 kW; pulse-width-modulation converter; state-of-charge balancing; transformerless battery energy storage system; voltage 200 V; voltage 6.6 kV; Batteries; Circuits; Energy storage; Photovoltaic cells; Power generation; Pulse width modulation; Pulse width modulation converters; Renewable energy resources; Wind energy generation; Wind turbines; Active-power control; BESS (battery energy storage system); NiMH (Nickel Metal Hydride) battery; SOC (state-of-charge) balancing; cascade converters;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2008. PESC 2008. IEEE

Conference_Location

Rhodes

ISSN

0275-9306

Print_ISBN

978-1-4244-1667-7

Electronic_ISBN

0275-9306

Type

conf

DOI

10.1109/PESC.2008.4592732

Filename

4592732