Title :
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
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;
Conference_Titel :
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Conference_Location :
Rhodes
Print_ISBN :
978-1-4244-1667-7
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2008.4592732
