A Transformerless Energy Storage System Based on a Cascade PWM Converter with Star-Configuration

Maharjan, Laxman; Yoshii, Tsurugi; Inoue, Shozo; Akagi, Hirofumi

doi:10.1109/pccon.2007.373051

Cited by 17 publications

(14 citation statements)

References 12 publications

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“…The method of individual SOC-balancing control in this study is similar to the DC voltage balancing control proposed previously by the authors [13,14].…”

Section: Control Systemmentioning

confidence: 93%

A 6.6‐kV transformerless battery energy storage system based on a cascade multilevel PWM converter: Experimental verification by a 200‐V, 10‐kW, 3.6‐kWh laboratory model

Inoue

Maharjan

Asakura

et al. 2011

Electrical Engineering Japan

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SUMMARYRenewable energy sources such as wind turbine generators and photovoltaics are intermittent in nature, thus resulting in fluctuating electric power. Leveling of their electric power is indispensable to realize large-scale renewable energy sources and to avoid severe power quality problems when they are interconnected into the grid. A battery energy storage system (BESS), combining batteries with a power converter and digital control, should be installed in the vicinity of an intermittent energy source. The fluctuating power is compensated by appropriately controlling active power stored in, or released from, the battery. This paper describes a 6.6-kV transformerless battery energy storage system based on a cascade multilevel PWM (pulse-width-modulation) converter, with focus on a control method for active power and SOC (state-of-charge) balancing. A down-scaled 200-V, 10-kW, 3.6-kWh (13-MJ) laboratory model using nine NiMH (Nickel Metal Hydride) battery packs was designed, constructed, and tested to verify the viability and effectiveness of the 6.6-kV system.

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“…The method of individual SOC-balancing control in this study is similar to the DC voltage balancing control proposed previously by the authors [13,14].…”

Section: Control Systemmentioning

confidence: 93%

A 6.6‐kV transformerless battery energy storage system based on a cascade multilevel PWM converter: Experimental verification by a 200‐V, 10‐kW, 3.6‐kWh laboratory model

Inoue

Maharjan

Asakura

et al. 2011

Electrical Engineering Japan

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“…4. The active-power control is based on decoupled current control, which is the same in control method and parameters as that presented in [39].…”

Section: B Transformerless Systemmentioning

confidence: 99%

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

Akagi

Maharjan

2009

2009 Brazilian Power Electronics Conference

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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 linefrequency 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 -BESS (battery energy storage system), cascade converters, fault-tolerant control, SOC (state-ofcharge) balancing.

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“…In recent years, large-capacity energy storage systems with cascade topology receive a lot of attention because of its topological structure characteristics [2,3], the single-machine capacity can easily achieve MW even hundred MW level. However, the control methods of large-capacity energy storage systems are still traditional PQ and V/f control.…”

Section: Introductionmentioning

confidence: 99%

A Novel Control Strategy for Large-Capacity Energy Storage Systems Based on Virtual Synchronous Generator

Wu¹,

Yang²,

Rui³

et al. 2017

Proceedings of the 2017 5th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 20

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Abstract. Large-capacity energy storage systems can meet the demands of micro-grid and the smart grid. But the traditional control method is difficult to realize plug and play and seamless switching between different operation modes, it has limited the roles of large-capacity energy storage system. Virtual synchronous generator (VSG) has became a hot topic in recent years because of its synchronous generator external characteristics, such as inertia, frequency voltage regulation and automatic phase lock. A novel control strategy based on VSG is proposed for large-capacity energy storage systems. Firstly, the topological structure characteristics of large-capacity energy storage systems and the basic principle of the novel control strategy based on VSG are introduced, then setting method of the control strategy parameters is given. Finally, the proposed control strategy is verified by simulation and experiment. The results of simulation and experiment show that large-capacity energy storage systems based on this novel control strategy can automatically adjust the active power output according to the grid frequency changes and realize seamless switching between connected-grid and off-grid mode.

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A Transformerless Energy Storage System Based on a Cascade PWM Converter with Star-Configuration

Cited by 17 publications

References 12 publications

A 6.6‐kV transformerless battery energy storage system based on a cascade multilevel PWM converter: Experimental verification by a 200‐V, 10‐kW, 3.6‐kWh laboratory model

A 6.6‐kV transformerless battery energy storage system based on a cascade multilevel PWM converter: Experimental verification by a 200‐V, 10‐kW, 3.6‐kWh laboratory model

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

A Novel Control Strategy for Large-Capacity Energy Storage Systems Based on Virtual Synchronous Generator

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