The Experts below are selected from a list of 3972 Experts worldwide ranked by ideXlab platform

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

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    IEEE Transactions on Industry Applications, 2012
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the application of a modular multilevel Cascade converter based on single-delta bridge cells (SDBCs) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full bridge) converter cells per leg, thus facilitating flexible circuit design, low-voltage steps, and low-electromagnetic-interference emissions. This paper designs, constructs, and tests a 100-V 5-kVA pulsewidth-modulated STATCOM based on the SDBC, with focus on the operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • Experimental verification of a modular multilevel Cascade inverter based on double-star bridge-cells (MMCI-DSBC)
    2012 IEEE Energy Conversion Congress and Exposition ECCE 2012, 2012
    Co-Authors: Nuntawat Thitichaiworakorn, Masahiro Hagiwara, Hirofumi Akagi
    Abstract:

    This paper presents a modular multilevel Cascade converter based on double-star bridge-cells (MMCC-DSBC), which is characterized by a Cascade Connection of multiple single-phase full-bridge PWM converter cells per leg. It is suitable for a wind turbine generation system with a permanent magnet synchronous generator, the frequency band of which ranges typically from 5 to 20 Hz. This paper discusses a wind turbine generation system based on the DSBC, revealing that the DSBC can achieve a grid Connection with an arbitrary dc-link voltage. Moreover, the operating principles and the control method are described in this paper. The validity of the system is verified experimentally by using a 200-V 10-kW downscaled model.

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    Energy Conversion Congress and Exposition, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents an application of a modular multilevel Cascade converter based on single-delta bridge-cells (MMCC-SDBC) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full-bridge) converter cells per leg, thus leading to flexible circuit design, low voltage steps, and low EMI emissions. However, no paper has been published on such a STATCOM with experimental verification. This paper designs, constructs, and tests a 100-V 5-kVA PWM STATCOM based on the SDBC with focus on operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • control and analysis of the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the modular multilevel Cascade converter based on double-star chopper-cells, which is intended for grid Connection to medium-voltage power systems without using line-frequency transformers. The converter is characterized by a modular arm structure consisting of Cascade Connection of multiple bidirectional pulsewidth modulation chopper-cells with floating dc capacitors. This arm structure requires voltage-balancing control of all the dc capacitors. However, the voltage control combining an averaging control with an individual-balancing control imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing under all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation and experiment.

  • classification terminology and application of the modular multilevel Cascade converter mmcc
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Hirofumi Akagi
    Abstract:

    This paper discusses the modular multilevel Cascade converter (MMCC) family based on Cascade Connection of multiple bidirectional chopper cells or single-phase full-bridge cells. The MMCC family is classified from circuit configuration as follows: the single-star bridge cells (SSBC); the single-delta bridge cells (SDBC); the double-star chopper cells (DSCC); and the double-star bridge cells (DSBC). The term MMCC corresponds to a family name in a person while, for example, the term SSBC corresponds to a given name. Therefore, the term “MMCC-SSBC” can identify the circuit configuration without any confusion. Among the four MMCC family members, the SSBC and DSCC are more practical in cost, performance, and market than the others although a distinct difference exists in application between the SSBC and DSCC. This paper presents application examples of the SSBC to a battery energy storage system (BESS), the SDBC to a static synchronous compensator (STATCOM) for negative-sequence reactive-power control, and the DSCC to a motor drive for fans and blowers, along with their experimental results.

Makoto Hagiwara - One of the best experts on this subject based on the ideXlab platform.

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    IEEE Transactions on Industry Applications, 2012
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the application of a modular multilevel Cascade converter based on single-delta bridge cells (SDBCs) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full bridge) converter cells per leg, thus facilitating flexible circuit design, low-voltage steps, and low-electromagnetic-interference emissions. This paper designs, constructs, and tests a 100-V 5-kVA pulsewidth-modulated STATCOM based on the SDBC, with focus on the operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    Energy Conversion Congress and Exposition, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents an application of a modular multilevel Cascade converter based on single-delta bridge-cells (MMCC-SDBC) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full-bridge) converter cells per leg, thus leading to flexible circuit design, low voltage steps, and low EMI emissions. However, no paper has been published on such a STATCOM with experimental verification. This paper designs, constructs, and tests a 100-V 5-kVA PWM STATCOM based on the SDBC with focus on operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • control and analysis of the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the modular multilevel Cascade converter based on double-star chopper-cells, which is intended for grid Connection to medium-voltage power systems without using line-frequency transformers. The converter is characterized by a modular arm structure consisting of Cascade Connection of multiple bidirectional pulsewidth modulation chopper-cells with floating dc capacitors. This arm structure requires voltage-balancing control of all the dc capacitors. However, the voltage control combining an averaging control with an individual-balancing control imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing under all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation and experiment.

  • negative sequence reactive power control by the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    Energy Conversion Congress and Exposition, 2010
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents a modular multilevel Cascade converter based on double-star chopper-cells (MMCC-DSCC) intended for its applications to a STATic synchronous COMpensator (STATCOM). The DSCC is characterized by Cascade Connection of multiple bidirectional chopper-cells per leg, thus leading to flexible circuit design, low voltage steps, low voltage harmonics, and low EMI emissions. However, no paper has been published on its application to STATCOMs with experimental verification. This paper designs, constructs, and tests a 200-V 10-kVA STATCOM based on the DSCC with focus on steady-state and transient-state performance as well as startup performance. Experimental results verify that it can start up by itself without using any auxiliary circuit, and that it achieves controlling the same amount of negative-sequence reactive power as the converter capacity.

  • theoretical analysis and control of the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    The International Power Electronics Conference - ECCE ASIA, 2010
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the modular multilevel Cascade converter based on double-star chopper-cells (MMCC-DSCC), which is intended for installation on the 6.6-kV Japanese industrial and utility distribution systems without using line-frequency transformers. The converter is characterized by an arm structure based on the module consisting of Cascade Connection of multiple bidirectional PWM chopper-cells and floating dc capacitors per arm. This arm structure requires voltage-balancing control for all the chopper-cells. However, the voltage control combining averaging- with individual-balancing controls imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing in all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation.

Ryo Maeda - One of the best experts on this subject based on the ideXlab platform.

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    IEEE Transactions on Industry Applications, 2012
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the application of a modular multilevel Cascade converter based on single-delta bridge cells (SDBCs) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full bridge) converter cells per leg, thus facilitating flexible circuit design, low-voltage steps, and low-electromagnetic-interference emissions. This paper designs, constructs, and tests a 100-V 5-kVA pulsewidth-modulated STATCOM based on the SDBC, with focus on the operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • negative sequence reactive power control by a pwm statcom based on a modular multilevel Cascade converter mmcc sdbc
    Energy Conversion Congress and Exposition, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents an application of a modular multilevel Cascade converter based on single-delta bridge-cells (MMCC-SDBC) to a STATic synchronous COMpensator (STATCOM), particularly for negative-sequence reactive-power control. The SDBC is characterized by Cascade Connection of multiple single-phase H-bridge (or full-bridge) converter cells per leg, thus leading to flexible circuit design, low voltage steps, and low EMI emissions. However, no paper has been published on such a STATCOM with experimental verification. This paper designs, constructs, and tests a 100-V 5-kVA PWM STATCOM based on the SDBC with focus on operating principle and performance. Experimental results verify that it can control not only positive-sequence reactive power but also negative-sequence reactive power and low-frequency active power intended for flicker compensation of arc furnaces.

  • control and analysis of the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the modular multilevel Cascade converter based on double-star chopper-cells, which is intended for grid Connection to medium-voltage power systems without using line-frequency transformers. The converter is characterized by a modular arm structure consisting of Cascade Connection of multiple bidirectional pulsewidth modulation chopper-cells with floating dc capacitors. This arm structure requires voltage-balancing control of all the dc capacitors. However, the voltage control combining an averaging control with an individual-balancing control imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing under all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation and experiment.

  • negative sequence reactive power control by the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    Energy Conversion Congress and Exposition, 2010
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents a modular multilevel Cascade converter based on double-star chopper-cells (MMCC-DSCC) intended for its applications to a STATic synchronous COMpensator (STATCOM). The DSCC is characterized by Cascade Connection of multiple bidirectional chopper-cells per leg, thus leading to flexible circuit design, low voltage steps, low voltage harmonics, and low EMI emissions. However, no paper has been published on its application to STATCOMs with experimental verification. This paper designs, constructs, and tests a 200-V 10-kVA STATCOM based on the DSCC with focus on steady-state and transient-state performance as well as startup performance. Experimental results verify that it can start up by itself without using any auxiliary circuit, and that it achieves controlling the same amount of negative-sequence reactive power as the converter capacity.

  • theoretical analysis and control of the modular multilevel Cascade converter based on double star chopper cells mmcc dscc
    The International Power Electronics Conference - ECCE ASIA, 2010
    Co-Authors: Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
    Abstract:

    This paper presents the modular multilevel Cascade converter based on double-star chopper-cells (MMCC-DSCC), which is intended for installation on the 6.6-kV Japanese industrial and utility distribution systems without using line-frequency transformers. The converter is characterized by an arm structure based on the module consisting of Cascade Connection of multiple bidirectional PWM chopper-cells and floating dc capacitors per arm. This arm structure requires voltage-balancing control for all the chopper-cells. However, the voltage control combining averaging- with individual-balancing controls imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing in all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation.

Yongxing Zhou - One of the best experts on this subject based on the ideXlab platform.

  • investigation of Cascade Connection method to improve the insertion loss of dm active emi filters
    IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021
    Co-Authors: Yongxing Zhou, Wenjie Chen, Xu Yang
    Abstract:

    In this paper, a new kind of Cascade Connection method of differential mode (DM) active EMI filter (AEF) is put forward. Contrary to the conventional idea, it is found different kinds of Cascade AEF-Connections show different insertion loss. Based upon mathematical analysis, among the eight potential Connection methods, two Cascade AEF-Connection methods are more effective than the other six methods. The insertion loss is much higher than the others. Therefore, the two effective topologies are further analyzed from several perspectives. And the best topology suiting the practical application is found. Several prototypes are fabricated and tested. Experimental results show good agreement with the theoretical calculation.

  • modeling and analysis of active emi filters with Cascade Connection to improve the insertion loss
    Energy Conversion Congress and Exposition, 2021
    Co-Authors: Yongxing Zhou, Wenjie Chen, Haoyu Wang, Ruitao Yan, Jinlu Liu, Ru Zhang
    Abstract:

    The insertion loss of passive filters can be improved through combinations of extra components. Similar method can also be used to optimize the performance of active EMI filter. This paper put forward a new kind of Cascade Connection of active EMI filters(AEF) to get a further attenuation to EMI noise. The proposed topology bases on basic active EMI filters and it is performed in a pure active way without using traditional passive components. The model of basic current sensing-current cancellation(CSCC) active EMI filter(AEF) is analyzed in detail. With this model, the topology of proposed Cascaded AEF is given. Besides, the further transfer function of noise signal and insertion loss are calculated. From the analysis, a decent insertion loss can be achieved and the improvement is dramatic. Simulations and the experiments are executed for verification and results show good agreement with the analysis.

Ru Zhang - One of the best experts on this subject based on the ideXlab platform.

  • modeling and analysis of active emi filters with Cascade Connection to improve the insertion loss
    Energy Conversion Congress and Exposition, 2021
    Co-Authors: Yongxing Zhou, Wenjie Chen, Haoyu Wang, Ruitao Yan, Jinlu Liu, Ru Zhang
    Abstract:

    The insertion loss of passive filters can be improved through combinations of extra components. Similar method can also be used to optimize the performance of active EMI filter. This paper put forward a new kind of Cascade Connection of active EMI filters(AEF) to get a further attenuation to EMI noise. The proposed topology bases on basic active EMI filters and it is performed in a pure active way without using traditional passive components. The model of basic current sensing-current cancellation(CSCC) active EMI filter(AEF) is analyzed in detail. With this model, the topology of proposed Cascaded AEF is given. Besides, the further transfer function of noise signal and insertion loss are calculated. From the analysis, a decent insertion loss can be achieved and the improvement is dramatic. Simulations and the experiments are executed for verification and results show good agreement with the analysis.