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Hirofumi Akagi - One of the best experts on this subject based on the ideXlab platform.

  • model predictive control of bidirectional ac dc converter for Energy Storage System
    Journal of Electrical Engineering & Technology, 2015
    Co-Authors: Md Parvez Akter, Saad Mekhilef, Nadia Mei Lin Tan, Hirofumi Akagi
    Abstract:

    Energy Storage System has been widely applied in power distribution sectors as well as in renewable Energy sources to ensure uninterruptible power supply. This paper presents a model predictive algorithm to control a bidirectional AC-DC converter, which is used in an Energy Storage System for power transferring between the three-phase AC voltage supply and Energy Storage devices. This model predictive control (MPC) algorithm utilizes the discrete behavior of the converter and predicts the future variables of the System by defining cost functions for all possible switching states. Subsequently, the switching state that corresponds to the minimum cost function is selected for the next sampling period for firing the switches of the AC-DC converter. The proposed model predictive control scheme of the AC-DC converter allows bidirectional power flow with instantaneous mode change capability and fast dynamic response. The performance of the MPC controlled bidirectional AC-DC converter is simulated with MATLAB/Simulink® and further verified with 3.0kW experimental prototypes. Both the simulation and experimental results show that, the AC-DC converter is operated with unity power factor, acceptable THD (3.3% during rectifier mode and 3.5% during inverter mode) level of AC current and very low DC voltage ripple. Moreover, an efficiency comparison is performed between the proposed MPC and conventional VOC-based PWM controller of the bidirectional AC-DC converter which ensures the effectiveness of MPC controller.

  • active power control of individual converter cells for a battery Energy Storage System based on a multilevel cascade pwm converter
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Laxman Maharjan, Tsukasa Yamagishi, Hirofumi Akagi
    Abstract:

    The battery Energy Storage System is an essential enabling device of the smart grid, because it helps grid connection of massive renewable Energy resources. This paper has a brief discussion on a battery Energy Storage System based on a multilevel cascade pulsewidth-modulated (PWM) converter for its practical use. The active-power control of individual converter cells is presented to make it possible to charge and discharge the battery units at different power levels while producing a three-phase balanced line-to-line voltage. This results in the maximum utilization of battery Energy even when the power-handling capabilities of the battery units differ. Experimental results obtained from a 200-V, 10-kW, 3.6-kWh battery Energy Storage System verify the effectiveness of the presented active-power control.

  • State-of-Charge (SOC)-Balancing Control of a Battery Energy Storage System Based on a Cascade PWM Converter
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: Jun Asakura, Hirofumi Akagi
    Abstract:

    Renewable Energy sources such as wind turbine generators and photovoltaics produce fluctuating electric power. The fluctuating power can be compensated by installing an Energy Storage System in the vicinity of these sources. This paper describes a 6.6-kV battery Energy Storage System based on a cascade pulsewidth-modulation (PWM) converter with focus on a control method for state-of-charge (SOC) balancing of the battery units. A 200-V, 10-kW, 3.6-kWh (13-MJ) laboratory System combining a cascade PWM converter with nine nickel metal hydride (NiMH) battery units is designed, constructed, and tested to verify the validity and effectiveness of the proposed balancing control.

  • a transformerless battery Energy Storage System based on a multilevel cascade pwm converter
    Power Electronics Specialists Conference, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi, Jun Asakura
    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.

  • A transformerless Energy Storage System based on a cascade multilevel PWM converter with star configuration
    IEEE Transactions on Industry Applications, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi
    Abstract:

    This paper describes a transformerless Energy Storage System based on a cascade multilevel pulsewidth modulation converter with star configuration. The System is intended for power leveling of renewable Energy sources, as well as for improving power quality and reliability of a power distribution System. This paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the Energy Storage System. A 200-V 10-kW 8.8-kJ downscaled laboratory System is designed, constructed, and tested, replacing electric double-layer capacitors with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory System verify the viability and effectiveness of the 6.6-kV Energy Storage System.

Hao Qian - One of the best experts on this subject based on the ideXlab platform.

  • A high-efficiency grid-tie battery Energy Storage System
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Hao Qian, Jih-sheng Lai, Junjun Zhang, Wensong Yu
    Abstract:

    Lithium-ion-based battery Energy Storage System has started to become the most popular form of Energy Storage System for its high charge and discharge efficiency and high Energy density. This paper proposes a high-efficiency grid-tie lithium-ion-battery-based Energy Storage System, which consists of a LiFePO $_4$ -battery-based Energy Storage and a high-efficiency bidirectional ac–dc converter. The battery management System estimates the state of charge and state of health of each battery cell and applies active charge equalization to balance the charge of all the cells in the pack. The bidirectional ac–dc converter works as the interface between the battery pack and the ac grid. A highly efficient opposed-current half-bridge-type inverter along with an admittance-compensated quasi-proportional resonant controller is adopted to ensure high power quality and precision power flow control. A 1-kW prototype has been designed and implemented to validate the proposed architecture and System performance.

  • A Grid-Tie Battery Energy Storage System
    2010
    Co-Authors: Douglas K. Lindner, Kathleen Meehan, Douglas J. Nelson, Hao Qian
    Abstract:

    Lithium-ion based battery Energy Storage System has become one of the most popular forms of Energy Storage System for its high charge and discharge efficiency and high Energy density. This dissertation proposes a high-efficiency grid-tie lithium-ion battery based Energy Storage System, which consists of a LiFePO4 battery based Energy Storage and associated battery management System (BMS), a high-efficiency bidirectional ac-dc converter and the central control unit which controls the operation mode and grid interface of the Energy Storage System. The BMS estimates the state of charge (SOC) and state of health (SOH) of each battery cell in the pack and applies active charge equalization to balance the charge of all the cells in the pack. The bidirectional ac-dc converter works as the interface between the battery pack and the ac grid, which needs to meet the requirements of bidirectional power flow capability and to ensure high power factor and low THD as well as to regulate the dc side power regulation. A highly efficient dual-buck converter based bidirectional ac-dc converter is proposed. The implemented converter efficiency peaks at 97.8 % at 50-kHz switching frequency fo

Laxman Maharjan - One of the best experts on this subject based on the ideXlab platform.

  • active power control of individual converter cells for a battery Energy Storage System based on a multilevel cascade pwm converter
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Laxman Maharjan, Tsukasa Yamagishi, Hirofumi Akagi
    Abstract:

    The battery Energy Storage System is an essential enabling device of the smart grid, because it helps grid connection of massive renewable Energy resources. This paper has a brief discussion on a battery Energy Storage System based on a multilevel cascade pulsewidth-modulated (PWM) converter for its practical use. The active-power control of individual converter cells is presented to make it possible to charge and discharge the battery units at different power levels while producing a three-phase balanced line-to-line voltage. This results in the maximum utilization of battery Energy even when the power-handling capabilities of the battery units differ. Experimental results obtained from a 200-V, 10-kW, 3.6-kWh battery Energy Storage System verify the effectiveness of the presented active-power control.

  • a transformerless battery Energy Storage System based on a multilevel cascade pwm converter
    Power Electronics Specialists Conference, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi, Jun Asakura
    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.

  • A transformerless Energy Storage System based on a cascade multilevel PWM converter with star configuration
    IEEE Transactions on Industry Applications, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi
    Abstract:

    This paper describes a transformerless Energy Storage System based on a cascade multilevel pulsewidth modulation converter with star configuration. The System is intended for power leveling of renewable Energy sources, as well as for improving power quality and reliability of a power distribution System. This paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the Energy Storage System. A 200-V 10-kW 8.8-kJ downscaled laboratory System is designed, constructed, and tested, replacing electric double-layer capacitors with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory System verify the viability and effectiveness of the 6.6-kV Energy Storage System.

  • a transformerless Energy Storage System based on a cascade pwm converter with star configuration
    Power Conversion Conference, 2007
    Co-Authors: Laxman Maharjan, Shigenori Inoue, T Yoshii, H Akagi
    Abstract:

    This paper describes a 6.6-kV transformerless Energy Storage System based on a cascade PWM converter with star-configuration. The System is intended to make a power System reliable and efficient, and to improve power quality in power Systems. The paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the Energy Storage System. A 200-V, 10-kW, 8.8-kJ down-scaled laboratory System is designed, constructed, and tested replacing EDLCs (electric double layer capacitors) with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory System verify the viability and effectiveness of the 6.6-kV System.

Shigenori Inoue - One of the best experts on this subject based on the ideXlab platform.

  • a transformerless battery Energy Storage System based on a multilevel cascade pwm converter
    Power Electronics Specialists Conference, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi, Jun Asakura
    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.

  • A transformerless Energy Storage System based on a cascade multilevel PWM converter with star configuration
    IEEE Transactions on Industry Applications, 2008
    Co-Authors: Laxman Maharjan, Shigenori Inoue, Hirofumi Akagi
    Abstract:

    This paper describes a transformerless Energy Storage System based on a cascade multilevel pulsewidth modulation converter with star configuration. The System is intended for power leveling of renewable Energy sources, as well as for improving power quality and reliability of a power distribution System. This paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the Energy Storage System. A 200-V 10-kW 8.8-kJ downscaled laboratory System is designed, constructed, and tested, replacing electric double-layer capacitors with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory System verify the viability and effectiveness of the 6.6-kV Energy Storage System.

  • a transformerless Energy Storage System based on a cascade pwm converter with star configuration
    Power Conversion Conference, 2007
    Co-Authors: Laxman Maharjan, Shigenori Inoue, T Yoshii, H Akagi
    Abstract:

    This paper describes a 6.6-kV transformerless Energy Storage System based on a cascade PWM converter with star-configuration. The System is intended to make a power System reliable and efficient, and to improve power quality in power Systems. The paper pays attention to active-power control and voltage-balancing control that are indispensable for proper operation of the Energy Storage System. A 200-V, 10-kW, 8.8-kJ down-scaled laboratory System is designed, constructed, and tested replacing EDLCs (electric double layer capacitors) with large-capacity electrolytic capacitors. Experimental results obtained from the laboratory System verify the viability and effectiveness of the 6.6-kV System.

  • A bidirectional DC-DC converter for an Energy Storage System with galvanic isolation
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Shigenori Inoue, Hirofumi Akagi
    Abstract:

    This paper addresses a bidirectional dc-dc converter suitable for an Energy Storage System with an additional function of galvanic isolation. An Energy Storage device such as an electric double layer capacitor is directly connected to a dc side of the dc-dc converter without any chopper circuit. Nevertheless, the dc-dc converter can continue operating when the voltage across the Energy Storage device drops along with its discharge. Theoretical calculation and experimental measurement reveal that power loss and peak current impose limitations on a permissible dc-voltage range. This information may be useful in design of the dc-dc converter. Experimental results verify proper charging and discharging operation obtained from a 200-V, 2.6-kJ laboratory model of the Energy Storage System. Moreover, the dc-dc converter can charge the capacitor bank from zero to the rated voltage without any external precharging circuit.

Wensong Yu - One of the best experts on this subject based on the ideXlab platform.

  • A high-efficiency grid-tie battery Energy Storage System
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Hao Qian, Jih-sheng Lai, Junjun Zhang, Wensong Yu
    Abstract:

    Lithium-ion-based battery Energy Storage System has started to become the most popular form of Energy Storage System for its high charge and discharge efficiency and high Energy density. This paper proposes a high-efficiency grid-tie lithium-ion-battery-based Energy Storage System, which consists of a LiFePO $_4$ -battery-based Energy Storage and a high-efficiency bidirectional ac–dc converter. The battery management System estimates the state of charge and state of health of each battery cell and applies active charge equalization to balance the charge of all the cells in the pack. The bidirectional ac–dc converter works as the interface between the battery pack and the ac grid. A highly efficient opposed-current half-bridge-type inverter along with an admittance-compensated quasi-proportional resonant controller is adopted to ensure high power quality and precision power flow control. A 1-kW prototype has been designed and implemented to validate the proposed architecture and System performance.