The Experts below are selected from a list of 516 Experts worldwide ranked by ideXlab platform
Tomonori Goya - One of the best experts on this subject based on the ideXlab platform.
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frequency control in isolated island by using parallel operated battery systems applying h control theory based on Droop Characteristics
Iet Renewable Power Generation, 2011Co-Authors: Naomitsu Urasaki, Atsushi Yona, Tomonobu Senjyu, Tomonori Goya, Eitaro Omine, Yoshihisa Kinjyo, Toshihisa FunabashiAbstract:Stand-alone ac power supply system such as isolated islands is subject to large frequency and voltage fluctuations caused by power deviations of wind turbine generator and load demand. The autonomous decentralised frequency control system of parallel operated decentralised generators based on Droop Characteristic is presented in this study. The conventional Droop control methods proposed in past researches show slow and oscillating dynamic responses. Moreover, the conventional Droop control is affected by measurement noise when the fast controllability of the system is emphasised. This study proposes the improved Droop control system for load sharing of multi-operated decentralised generators by applying H ∞ control theory, improving transient response of Droop control and robustness against measurement noise and parameter variations. Simulation results validate the effectiveness of the proposed control system.
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a hybrid smart ac dc power system
IEEE Transactions on Smart Grid, 2010Co-Authors: Kyohei Kurohane, Naomitsu Urasaki, Atsushi Yona, Tomonobu Senjyu, Tomonori Goya, Toshihisa FunabashiAbstract:Recently, smart grids are attracting attention. Already, a smart grid based on an AC grid is proposed. However, no study on research is presented or published on a smart grid based on a dc grid. This paper presents an ac/dc hybrid smart power system. The proposed system has advantages of both dc and ac grids. The proposed power system consists of a wind generator and several controllable loads. The controllable loads have different capacities. Therefore, by applying power consumption control with the Droop Characteristic, the dc bus voltage is maintained within the acceptable range. As controllable loads, electric water heater and electric vehicle are assumed. Effectiveness of the proposed method is verified by numerical simulation results.
Toshihisa Funabashi - One of the best experts on this subject based on the ideXlab platform.
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frequency control in isolated island by using parallel operated battery systems applying h control theory based on Droop Characteristics
Iet Renewable Power Generation, 2011Co-Authors: Naomitsu Urasaki, Atsushi Yona, Tomonobu Senjyu, Tomonori Goya, Eitaro Omine, Yoshihisa Kinjyo, Toshihisa FunabashiAbstract:Stand-alone ac power supply system such as isolated islands is subject to large frequency and voltage fluctuations caused by power deviations of wind turbine generator and load demand. The autonomous decentralised frequency control system of parallel operated decentralised generators based on Droop Characteristic is presented in this study. The conventional Droop control methods proposed in past researches show slow and oscillating dynamic responses. Moreover, the conventional Droop control is affected by measurement noise when the fast controllability of the system is emphasised. This study proposes the improved Droop control system for load sharing of multi-operated decentralised generators by applying H ∞ control theory, improving transient response of Droop control and robustness against measurement noise and parameter variations. Simulation results validate the effectiveness of the proposed control system.
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a hybrid smart ac dc power system
IEEE Transactions on Smart Grid, 2010Co-Authors: Kyohei Kurohane, Naomitsu Urasaki, Atsushi Yona, Tomonobu Senjyu, Tomonori Goya, Toshihisa FunabashiAbstract:Recently, smart grids are attracting attention. Already, a smart grid based on an AC grid is proposed. However, no study on research is presented or published on a smart grid based on a dc grid. This paper presents an ac/dc hybrid smart power system. The proposed system has advantages of both dc and ac grids. The proposed power system consists of a wind generator and several controllable loads. The controllable loads have different capacities. Therefore, by applying power consumption control with the Droop Characteristic, the dc bus voltage is maintained within the acceptable range. As controllable loads, electric water heater and electric vehicle are assumed. Effectiveness of the proposed method is verified by numerical simulation results.
Rodríguez Cortés Pedro - One of the best experts on this subject based on the ideXlab platform.
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Decentralized primary control of MTDC networks with energy storage and distributed generation
'Institute of Electrical and Electronics Engineers (IEEE)', 2014Co-Authors: Gavriluta Catalin, Candela García, José Ignacio, Citro Costantino, Rocabert Delgado Joan, Luna Alloza Álvaro, Rodríguez Cortés PedroAbstract:Multiterminal dc networks are drawing a lot of interest lately in applications related to distributed generation, particularly in those that also integrate energy storage (ES). A few approaches for controlling the operation of such systems have been proposed in the literature; however, the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on custom Droop Characteristics obtained by combining concepts of Droop and dc-bus signaling control. This approach is designed to be generic and takes into account the various operating states of the network. Five operating bands, similar to the operating states of the ac grids, as well as various Droop Characteristics for different elements connected to the dc network, are defined. For the ES, the state of charge is taken into account at the primary control level and included in the Droop Characteristic, creating a two-variable Droop surface. The proposed control strategy is validated through simulation and experimental results obtained from a case study that involves amicro dc network composed of a photovoltaic generator, a lead-acid battery, and a connection point to the ac grid.Peer Reviewe
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Decentralized primary control of MTDC networks with energy storage and distributed generation
'Institute of Electrical and Electronics Engineers (IEEE)', 2014Co-Authors: Gavriluta Catalin, Candela García, José Ignacio, Citro Costantino, Rocabert Delgado Joan, Luna Alloza Álvaro, Rodríguez Cortés PedroAbstract:Multiterminal dc networks are drawing a lot of interest lately in applications related to distributed generation, particularly in those that also integrate energy storage (ES). A few approaches for controlling the operation of such systems have been proposed in the literature; however, the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on custom Droop Characteristics obtained by combining concepts of Droop and dc-bus signaling control. This approach is designed to be generic and takes into account the various operating states of the network. Five operating bands, similar to the operating states of the ac grids, as well as various Droop Characteristics for different elements connected to the dc network, are defined. For the ES, the state of charge is taken into account at the primary control level and included in the Droop Characteristic, creating a two-variable Droop surface. The proposed control strategy is validated through simulation and experimental results obtained from a case study that involves amicro dc network composed of a photovoltaic generator, a lead-acid battery, and a connection point to the ac grid.Peer ReviewedPostprint (published version
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Decentralized control of MTDC networks with energy storage and distributed generation
'Institute of Electrical and Electronics Engineers (IEEE)', 2013Co-Authors: Gavriluta Catalin, Candela García, José Ignacio, Citro Costantino, Luna Alloza Álvaro, Rodríguez Cortés PedroAbstract:Multi-terminal dc (MTDC) networks are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate energy storage. Several approaches for controlling the operation of such systems have been proposed in the literature; however the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on Droop and dc-bus signaling to serve as a base framework for implementing a hierarchical control structure in a MTDC system. As it will be further discussed in this work, five operating bands as well as various Droop Characteristics for different elements connected to the dc-bus were defined. For the energy storage the state of charge (SoC) was taken into account at the primary control level and it was included in the Droop Characteristic, creating a two variables Droop surface. The proposed control strategy was validated through simulation and experimental results obtained from a case study that involves a micro dc network composed of a PV generator, a lead-acid battery and one connection point to the ac grid. © 2013 IEEE.Postprint (published version
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Decentralized control of MTDC networks with energy storage and distributed generation
'Institute of Electrical and Electronics Engineers (IEEE)', 2013Co-Authors: Gavriluta Catalin, Candela García, José Ignacio, Citro Costantino, Luna Alloza Álvaro, Rodríguez Cortés PedroAbstract:Multi-terminal dc (MTDC) networks are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate energy storage. Several approaches for controlling the operation of such systems have been proposed in the literature; however the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on Droop and dc-bus signaling to serve as a base framework for implementing a hierarchical control structure in a MTDC system. As it will be further discussed in this work, five operating bands as well as various Droop Characteristics for different elements connected to the dc-bus were defined. For the energy storage the state of charge (SoC) was taken into account at the primary control level and it was included in the Droop Characteristic, creating a two variables Droop surface. The proposed control strategy was validated through simulation and experimental results obtained from a case study that involves a micro dc network composed of a PV generator, a lead-acid battery and one connection point to the ac grid. © 2013 IEEE
Fanbo He - One of the best experts on this subject based on the ideXlab platform.
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transmission loss optimization based optimal power flow strategy by hierarchical control for dc microgrids
IEEE Transactions on Power Electronics, 2017Co-Authors: Liqiang Yuan, Zhengming Zhao, Fanbo HeAbstract:This paper proposes an efficient power flow sharing and voltage regulation control method based on hierarchical control to minimize the transmission loss of dc microgrids. Different from the conventional optimal power flow algorithm for the dc grids, the proposed approach needs neither prior knowledge of the grid's conductance matrix nor the load distribution matrix, which means improvement of the expansibility and reduction of the cost. At the primary control level, a voltage Droop Characteristic is set for each converter to improve the stability and reliability of the grid. The secondary control level aims to regulate the power flow of the microgrid to the optimal condition. The two control levels exchange information by low bandwidth communication. The validity of the proposed approach is verified by both simulation results of a dc microgrid based on IEEE 14-bus system and experimental results on a 50-V two-terminal prototype dc microgrid.
Marco Liserre - One of the best experts on this subject based on the ideXlab platform.
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reverse power flow control in a st fed distribution grid
IEEE Transactions on Smart Grid, 2018Co-Authors: Giovanni De Carne, Giampaolo Buticchi, Marco LiserreAbstract:The massive integration of distributed generation in the grid poses new challenges to the system operators, like the reverse power flow from the low voltage (LV) to medium voltage (MV) grid. In the case of high DG power production and low load absorption, the voltage rises in the line reaching the upper voltage limit. At this regard the smart transformer (ST) offers a new possibility to limit the reverse power flow in the MV grids. The ST can adapt the voltage waveform modifying the frequency in order to interact with the local distributed generation, that are normally equipped with Droop Characteristic. However, when a fast change in the frequency is applied to avoid reverse power flow to MV grid, stability problems, so far not investigated, arise. In this paper, the stability analysis has been performed analytically and validated by means of control-hardware-in-loop in a real time digital simulator and with experimental results in laboratory.
