The Experts below are selected from a list of 18195 Experts worldwide ranked by ideXlab platform

Yasuhiro Hayashi - One of the best experts on this subject based on the ideXlab platform.

  • centralized voltage Control method of load ratio Control Transformer and step voltage regulator for bank fault restoration
    IEEE PES Innovative Smart Grid Technologies Europe, 2012
    Co-Authors: Shinya Yoshizawa, Yasuhiro Hayashi, Masaki Tsuji, Eiji Kamiya
    Abstract:

    This paper presents and verifies a method for centralized voltage Control of load ratio Control Transformers and step voltage regulators for bank fault restoration. In conventional methods, voltage Control in distribution systems primarily serves to alleviate voltage violations. Conventional methods remain imperfect, however, so it is necessary to evaluate how to minimize the number of violations during bank fault restoration. Thus, the proposed method adjusts the tap position of voltage regulators to minimize the number of affected customers in consideration of the power factor Control of photovoltaic generation systems. We perform numerical simulations of bank fault restoration to verify the effectiveness of the proposed method, and visually compare the results with those of the conventional method.

  • voltage Control method by svc in consideration of cooperative Control with lrt and determination method for rated capacity and Control parameters of svc
    Ieej Transactions on Power and Energy, 2010
    Co-Authors: Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki, Masuhiro Yamaguchi
    Abstract:

    In recent years, the number of connection of distributed generators (DGs) such as the photovoltaic generation (PV) and wind power generation is increasing, and there is in danger of changing the voltages in a distribution system by the precipitous output variation of DGs. In this study, the authors propose one voltage Control method of a distribution system by the static var compensator (SVC) in consideration of cooperation with the load ratio Control Transformer (LRT) of laggard Control response installed beforehand in the distribution system. The proposed method may be able to make the rated capacity of SVC small and may be able to reduce the aggravation of power factor of the distribution system, by setting up the dead band of voltage Control appropriately. And the authors propose one determination method of the necessary minimum rated capacity and optimum Control parameters of SVC in view of the cost of equipment and high-speed Controllability. In order to verify the validity of the proposed method, the numerical calculations are carried out by using a distribution system model.

Senjyu Tomonobu - One of the best experts on this subject based on the ideXlab platform.

  • Unbalanced Voltage Compensation with Optimal Voltage Controlled Regulators and Load Ratio Control Transformer
    'MDPI AG', 2021
    Co-Authors: Nakadomari Akito, Shigenobu Ryuto, Kato Takeyoshi, Krishnan Narayanan, Hemeida, Ashraf Mohamed, Takahashi Hiroshi, Senjyu Tomonobu
    Abstract:

    Penetration of equipment such as photovoltaic power generations (PV), heat pump water heaters (HP), and electric vehicles (EV) introduces voltage unbalance issues in distribution systems. Controlling PV and energy storage system (ESS) outputs or coordinated EV charging are investigated for voltage unbalance compensation. However, some issues exist, such as dependency on installed capacity and fairness among consumers. Therefore, the ideal way to mitigate unbalanced voltages is to use grid-side equipment mainly. This paper proposes a voltage unbalance compensation based on optimal tap operation scheduling of three-phase individual Controlled step voltage regulators (3φfSVR) and load ratio Control Transformer (LRT). In the formulation of the optimization problem, multiple voltage unbalance metrics are comprehensively included. In addition, voltage deviations, network losses, and coordinated tap operations, which are typical issues in distribution systems, are considered. In order to investigate the mutual influence among voltage unbalance and other typical issues, various optimization problems are formulated, and then they are compared by numerical simulations. The results show that the proper operation of 3φSVRs and LRT effectively mitigates voltage unbalance. Furthermore, the results also show that voltage unbalances and other typical issues can be improved simultaneously with appropriate formulations

Eiji Kamiya - One of the best experts on this subject based on the ideXlab platform.

  • centralized voltage Control method of load ratio Control Transformer and step voltage regulator for bank fault restoration
    IEEE PES Innovative Smart Grid Technologies Europe, 2012
    Co-Authors: Shinya Yoshizawa, Yasuhiro Hayashi, Masaki Tsuji, Eiji Kamiya
    Abstract:

    This paper presents and verifies a method for centralized voltage Control of load ratio Control Transformers and step voltage regulators for bank fault restoration. In conventional methods, voltage Control in distribution systems primarily serves to alleviate voltage violations. Conventional methods remain imperfect, however, so it is necessary to evaluate how to minimize the number of violations during bank fault restoration. Thus, the proposed method adjusts the tap position of voltage regulators to minimize the number of affected customers in consideration of the power factor Control of photovoltaic generation systems. We perform numerical simulations of bank fault restoration to verify the effectiveness of the proposed method, and visually compare the results with those of the conventional method.

Masuhiro Yamaguchi - One of the best experts on this subject based on the ideXlab platform.

  • voltage Control method by svc in consideration of cooperative Control with lrt and determination method for rated capacity and Control parameters of svc
    Ieej Transactions on Power and Energy, 2010
    Co-Authors: Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki, Masuhiro Yamaguchi
    Abstract:

    In recent years, the number of connection of distributed generators (DGs) such as the photovoltaic generation (PV) and wind power generation is increasing, and there is in danger of changing the voltages in a distribution system by the precipitous output variation of DGs. In this study, the authors propose one voltage Control method of a distribution system by the static var compensator (SVC) in consideration of cooperation with the load ratio Control Transformer (LRT) of laggard Control response installed beforehand in the distribution system. The proposed method may be able to make the rated capacity of SVC small and may be able to reduce the aggravation of power factor of the distribution system, by setting up the dead band of voltage Control appropriately. And the authors propose one determination method of the necessary minimum rated capacity and optimum Control parameters of SVC in view of the cost of equipment and high-speed Controllability. In order to verify the validity of the proposed method, the numerical calculations are carried out by using a distribution system model.

Nakadomari Akito - One of the best experts on this subject based on the ideXlab platform.

  • Unbalanced Voltage Compensation with Optimal Voltage Controlled Regulators and Load Ratio Control Transformer
    'MDPI AG', 2021
    Co-Authors: Nakadomari Akito, Shigenobu Ryuto, Kato Takeyoshi, Krishnan Narayanan, Hemeida, Ashraf Mohamed, Takahashi Hiroshi, Senjyu Tomonobu
    Abstract:

    Penetration of equipment such as photovoltaic power generations (PV), heat pump water heaters (HP), and electric vehicles (EV) introduces voltage unbalance issues in distribution systems. Controlling PV and energy storage system (ESS) outputs or coordinated EV charging are investigated for voltage unbalance compensation. However, some issues exist, such as dependency on installed capacity and fairness among consumers. Therefore, the ideal way to mitigate unbalanced voltages is to use grid-side equipment mainly. This paper proposes a voltage unbalance compensation based on optimal tap operation scheduling of three-phase individual Controlled step voltage regulators (3φfSVR) and load ratio Control Transformer (LRT). In the formulation of the optimization problem, multiple voltage unbalance metrics are comprehensively included. In addition, voltage deviations, network losses, and coordinated tap operations, which are typical issues in distribution systems, are considered. In order to investigate the mutual influence among voltage unbalance and other typical issues, various optimization problems are formulated, and then they are compared by numerical simulations. The results show that the proper operation of 3φSVRs and LRT effectively mitigates voltage unbalance. Furthermore, the results also show that voltage unbalances and other typical issues can be improved simultaneously with appropriate formulations