The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Lieven Vandevelde - One of the best experts on this subject based on the ideXlab platform.

  • voltage unbalance and overvoltage mitigation by using the three phase damping control strategy in battery storage applications
    IEEE International Conference on Renewable Energy Research and Applications, 2018
    Co-Authors: Dimitar Bozalakov, Mohannad Jabbar Mnati, Joannes Laveyne, Alex Van Den Bossche, Lieven Vandevelde
    Abstract:

    The constantly decreasing prices of the battery storage systems make them a very attractive solution for mitigating over voltages and voltage unbalance in low voltage grids with high penetration of renewable energy resources. A centralised storage device, connected at the end of the feeder can be a very effective solution for dealing with over voltages. The classical positive-sequence control strategy is usually employed in these devices to ensure a Power Exchange between the grid and the battery and vice versa. Nevertheless, the voltage unbalance cannot be mitigated by the classical control strategies. In this article, a modified three-phase damping control strategy is used to discharge and charge the battery storage system. This control strategy has an improved resistive behavior towards the zero- and negative-sequence components which mitigates the voltage unbalance by injecting or drawing asymmetrical phase currents. Thus both Power quality problems are mitigated.

  • development of a smart transformer to control the Power Exchange of a microgrid
    IEEE PES Innovative Smart Grid Technologies Conference, 2013
    Co-Authors: Wim Willems, Tine L. Vandoorn, Jeroen D. M. De Kooning, Lieven Vandevelde
    Abstract:

    A smart transformer enables to control the Power Exchange between a microgrid and the utility network by controlling the voltage at the microgrid side within certain limits. The distributed generation units in the microgrid are equipped with a voltage-based droop control strategy. This controller reacts on the voltage change, making the smart transformer an element that controls Power Exchange without the need for communication to other elements in the microgrid. To build a smart transformer, several concepts are possible. In a smart transformer with continuous turns ratio, hereafter referred to as continuous smart transformer, the transformer's microgrid-side voltage can be controlled without voltage steps and the accuracy of the voltage control can be very high. The voltage control of a smart transformer with discrete turns ratio, hereafter referred to as discrete smart transformer, is less accurate, as the output voltage is regulated between several discrete values. In this paper, the development of a continuous and discrete smart transformer will be elaborated. Their validity will be proven by implementing these smart transformers in an experimental test setup. Also, some concepts to improve the control accuracy will be proposed.

  • Voltage-Based control of a smart transformer in a microgrid
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Tine L. Vandoorn, Jeroen D. M. De Kooning, Bart Meersman, Lieven Vandevelde
    Abstract:

    For the islanded operation of a microgrid, several control strategies have been developed. For example, voltage-based droop control can be implemented for the active Power control of the generators and the control of the active loads. One of the main advantages of a microgrid is that it can be implemented as a controllable entity within the electrical network. This requires the ability of the utility grid to control or influence the Power Exchange with the microgrid by communicating with only one unit. However, little research has been conducted on controlling the Power transfer through the point of common coupling (PCC). This paper addresses this issue by introducing the concept of a smart transformer (ST) at the PCC. This unit controls the active Power Exchange between a microgrid and the utility grid dependent on the state of both networks and other information communicated to the ST. To control the active Power, the ST uses its taps that change the microgrid-side voltage at the PCC. This voltage-based control of the ST is compatible with the voltage-based droop control of the units in the microgrid that is used in this paper. Hence, the microgrid units can automatically respond to changes of ST set points and vice versa. Several simulation cases are included in this paper to demonstrate the feasibility of the ST concept.

Kenji Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • a concept proposal for peer to peer Power Exchange by market mechanism
    International Conference on Consumer Electronics, 2018
    Co-Authors: Kenji Tanaka, Rikiya Abe
    Abstract:

    Electricity has been delivered from high voltage centralized Power generating plants to low voltage users based on physics theory. It will not be sustainable when more and more decentralized energy has been installed to the society. To manage millions generation sites, the energy delivery system based on market mechanisms can be an answerr. In this paper, we propose a platform that Exchange Power between individual consumers using digitalgrid technology and blockchain that can digitally control Power.

  • a fully renewable dc microgrid with autonomous Power distribution algorithm
    Eco Design, 2017
    Co-Authors: Nobuyuki Kitamura, Annette Werth, Kenji Tanaka
    Abstract:

    In this study, we propose an autonomous DC microgrid system for residential community with distributed Power Exchange control to increase the utilization of renewable natural energy and to ensure minimal energy supply in the event of a large-scale disaster. Assuming small community of 20 houses, each house in the microgrid has its own in-house system that can continue to provide Power to appliances from its own batteries and solar panels even when disconnected from the utility grid or Power outage. Using solar irradiation time series and individual household Power demand records, we examined its performance using real-time simulations. Finally, we propose a sustainable Power system based on renewable energy that further minimizes fossil fuel consumption by integrating a renewable auxiliary Power supply system such as the hydrogen energy system.

  • conceptual study for open energy systems distributed energy network using interconnected dc nanogrids
    IEEE Transactions on Smart Grid, 2015
    Co-Authors: Annette Werth, Nobuyuki Kitamura, Kenji Tanaka
    Abstract:

    We describe the general concept and practical feasibility of a dc-based open energy system (OES) that proposes an alternative way of exchanging intermittent energy between houses in a local community. Each house is equipped with a dc nanogrid, including photovoltaic panels and batteries. We extend these nanogrids with a bidirectional dc–dc converter and a network controller so that Power can be Exchanged between houses over an external dc Power bus. In this way, demand-response fluctuations are absorbed not only by the local battery, but can be spread over all batteries in the system. By using a combination of voltage and current controlled units, we implemented a higher-level control software independent from the physical process. A further software layer for autonomous control handles Power Exchange based on a distributed multiagent system, using a peer-to-peer like architecture. In parallel to the software, we made a physical model of a four-node OES on which different Power Exchange strategies can be simulated and compared. First results show an improved solar replacement ratio, and thus a reduction of ac grid consumption thanks to Power interchange. The concept’s feasibility has been demonstrated on the first three houses of a full-scale OES platform in Okinawa.

  • conceptual study for open energy systems distributed energy network using interconnected dc nanogrids
    IEEE Transactions on Smart Grid, 2015
    Co-Authors: Annette Werth, Nobuyuki Kitamura, Kenji Tanaka
    Abstract:

    We describe the general concept and practical feasibility of a dc-based open energy system (OES) that proposes an alternative way of exchanging intermittent energy between houses in a local community. Each house is equipped with a dc nanogrid, including photovoltaic panels and batteries. We extend these nanogrids with a bidirectional dc–dc converter and a network controller so that Power can be Exchanged between houses over an external dc Power bus. In this way, demand-response fluctuations are absorbed not only by the local battery, but can be spread over all batteries in the system. By using a combination of voltage and current controlled units, we implemented a higher-level control software independent from the physical process. A further software layer for autonomous control handles Power Exchange based on a distributed multiagent system, using a peer-to-peer like architecture. In parallel to the software, we made a physical model of a four-node OES on which different Power Exchange strategies can be simulated and compared. First results show an improved solar replacement ratio, and thus a reduction of ac grid consumption thanks to Power interchange. The concept’s feasibility has been demonstrated on the first three houses of a full-scale OES platform in Okinawa.

Tine L. Vandoorn - One of the best experts on this subject based on the ideXlab platform.

  • development of a smart transformer to control the Power Exchange of a microgrid
    IEEE PES Innovative Smart Grid Technologies Conference, 2013
    Co-Authors: Wim Willems, Tine L. Vandoorn, Jeroen D. M. De Kooning, Lieven Vandevelde
    Abstract:

    A smart transformer enables to control the Power Exchange between a microgrid and the utility network by controlling the voltage at the microgrid side within certain limits. The distributed generation units in the microgrid are equipped with a voltage-based droop control strategy. This controller reacts on the voltage change, making the smart transformer an element that controls Power Exchange without the need for communication to other elements in the microgrid. To build a smart transformer, several concepts are possible. In a smart transformer with continuous turns ratio, hereafter referred to as continuous smart transformer, the transformer's microgrid-side voltage can be controlled without voltage steps and the accuracy of the voltage control can be very high. The voltage control of a smart transformer with discrete turns ratio, hereafter referred to as discrete smart transformer, is less accurate, as the output voltage is regulated between several discrete values. In this paper, the development of a continuous and discrete smart transformer will be elaborated. Their validity will be proven by implementing these smart transformers in an experimental test setup. Also, some concepts to improve the control accuracy will be proposed.

  • Voltage-Based control of a smart transformer in a microgrid
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Tine L. Vandoorn, Jeroen D. M. De Kooning, Bart Meersman, Lieven Vandevelde
    Abstract:

    For the islanded operation of a microgrid, several control strategies have been developed. For example, voltage-based droop control can be implemented for the active Power control of the generators and the control of the active loads. One of the main advantages of a microgrid is that it can be implemented as a controllable entity within the electrical network. This requires the ability of the utility grid to control or influence the Power Exchange with the microgrid by communicating with only one unit. However, little research has been conducted on controlling the Power transfer through the point of common coupling (PCC). This paper addresses this issue by introducing the concept of a smart transformer (ST) at the PCC. This unit controls the active Power Exchange between a microgrid and the utility grid dependent on the state of both networks and other information communicated to the ST. To control the active Power, the ST uses its taps that change the microgrid-side voltage at the PCC. This voltage-based control of the ST is compatible with the voltage-based droop control of the units in the microgrid that is used in this paper. Hence, the microgrid units can automatically respond to changes of ST set points and vice versa. Several simulation cases are included in this paper to demonstrate the feasibility of the ST concept.

Jeroen D. M. De Kooning - One of the best experts on this subject based on the ideXlab platform.

  • development of a smart transformer to control the Power Exchange of a microgrid
    IEEE PES Innovative Smart Grid Technologies Conference, 2013
    Co-Authors: Wim Willems, Tine L. Vandoorn, Jeroen D. M. De Kooning, Lieven Vandevelde
    Abstract:

    A smart transformer enables to control the Power Exchange between a microgrid and the utility network by controlling the voltage at the microgrid side within certain limits. The distributed generation units in the microgrid are equipped with a voltage-based droop control strategy. This controller reacts on the voltage change, making the smart transformer an element that controls Power Exchange without the need for communication to other elements in the microgrid. To build a smart transformer, several concepts are possible. In a smart transformer with continuous turns ratio, hereafter referred to as continuous smart transformer, the transformer's microgrid-side voltage can be controlled without voltage steps and the accuracy of the voltage control can be very high. The voltage control of a smart transformer with discrete turns ratio, hereafter referred to as discrete smart transformer, is less accurate, as the output voltage is regulated between several discrete values. In this paper, the development of a continuous and discrete smart transformer will be elaborated. Their validity will be proven by implementing these smart transformers in an experimental test setup. Also, some concepts to improve the control accuracy will be proposed.

  • Voltage-Based control of a smart transformer in a microgrid
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Tine L. Vandoorn, Jeroen D. M. De Kooning, Bart Meersman, Lieven Vandevelde
    Abstract:

    For the islanded operation of a microgrid, several control strategies have been developed. For example, voltage-based droop control can be implemented for the active Power control of the generators and the control of the active loads. One of the main advantages of a microgrid is that it can be implemented as a controllable entity within the electrical network. This requires the ability of the utility grid to control or influence the Power Exchange with the microgrid by communicating with only one unit. However, little research has been conducted on controlling the Power transfer through the point of common coupling (PCC). This paper addresses this issue by introducing the concept of a smart transformer (ST) at the PCC. This unit controls the active Power Exchange between a microgrid and the utility grid dependent on the state of both networks and other information communicated to the ST. To control the active Power, the ST uses its taps that change the microgrid-side voltage at the PCC. This voltage-based control of the ST is compatible with the voltage-based droop control of the units in the microgrid that is used in this paper. Hence, the microgrid units can automatically respond to changes of ST set points and vice versa. Several simulation cases are included in this paper to demonstrate the feasibility of the ST concept.

Daniela Trombetti - One of the best experts on this subject based on the ideXlab platform.

  • distribution loss minimization by token ring control of Power electronic interfaces in residential microgrids
    IEEE Transactions on Industrial Electronics, 2012
    Co-Authors: Paolo Tenti, Paolo Mattavelli, Alessandro Costabeber, Daniela Trombetti
    Abstract:

    Smart microgrids offer a new application domain for Power electronics. In fact, every distributed energy resource includes an electronic Power processor (EPP) to control the Power Exchange with the grid. If such distributed EPPs perform cooperatively, all the available energy sources and energy storage units can be fully exploited, resulting in reduced Power consumption from the utility, high Power quality, and increased hosting capability by the utility. This paper shows that, even in low-voltage meshed microgrids, where the electrical distribution pattern is complex and sources and loads may vary during daytime, such cooperative operation can be achieved by a proper selection of the local control algorithms and by allowing narrow-band communication capability among neighbor EPPs. In particular, this paper describes a token ring control approach which allows full exploitation of the microgrid capabilities with marginal investment in the information and communication technology infrastructure.

  • distribution loss minimization by token ring control of Power electronic interfaces in residential micro grids
    International Symposium on Industrial Electronics, 2010
    Co-Authors: Paolo Tenti, Daniela Trombetti, Alessandro Costabeber, Paolo Mattavelli
    Abstract:

    Smart grids offer a new application domain for Power electronics. In fact, every Distributed Energy Resource (DER) includes an Electronic Power Processor (EPP) to govern the Power Exchange with the grid. Such distributed EPPs should perform cooperatively to take full advantage of smart grid potentiality (exploitation of renewable energy sources, Power quality and transmission efficiency). In low-voltage residential micro-grids, where number and type of DERs and loads is unpredictable and may vary during daytime, cooperative operation can be achieved by simple cross-communication among neighbor EPPs, without centralized supervisor or additional control units. The paper describes the principles of such cooperative operation together with a communication and control architecture which allows exploitation of micro-grid capabilities without infrastructural investments.