The Experts below are selected from a list of 64884 Experts worldwide ranked by ideXlab platform
Prodromos Daoutidis - One of the best experts on this subject based on the ideXlab platform.
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Microgrid/Macrogrid Energy Exchange: A Novel Market Structure and Stochastic Scheduling
IEEE Transactions on Smart Grid, 2017Co-Authors: Michael Zachar, Prodromos DaoutidisAbstract:This paper explores the stochastic scheduling of Microgrids where energy exchange with the macrogrid must be coordinated ahead of time. In particular, a market structure is proposed in which Microgrid operators make day-ahead energy exchange commitments. Microgrids are fined for deviating too far from commitments and a maximum difference between commitments in subsequent hours is enforced. These constraints are included to reduce the burden placed on the macrogrid by distributed generation. Under this market structure, a scheduling problem is formulated for a Microgrid system consisting of microturbines, a photovoltaic array, a battery bank, and a bi-directional connection to the macrogrid. Chance-constrained optimization is used to minimize operational cost and ensure the energy exchange commitments are met. The problem is transformed into a mixed integer linear program, and is solved to show that these commitments can be satisfied with a high level of certainty and to illustrate inherent tradeoffs between Microgrid performance and level of regulation.
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Microgrid macrogrid energy exchange a novel market structure and stochastic scheduling
IEEE Transactions on Smart Grid, 2017Co-Authors: Michael Zachar, Prodromos DaoutidisAbstract:This paper explores the stochastic scheduling of Microgrids where energy exchange with the macrogrid must be coordinated ahead of time. In particular, a market structure is proposed in which Microgrid operators make day-ahead energy exchange commitments. Microgrids are fined for deviating too far from commitments and a maximum difference between commitments in subsequent hours is enforced. These constraints are included to reduce the burden placed on the macrogrid by distributed generation. Under this market structure, a scheduling problem is formulated for a Microgrid system consisting of microturbines, a photovoltaic array, a battery bank, and a bi-directional connection to the macrogrid. Chance-constrained optimization is used to minimize operational cost and ensure the energy exchange commitments are met. The problem is transformed into a mixed integer linear program, and is solved to show that these commitments can be satisfied with a high level of certainty and to illustrate inherent tradeoffs between Microgrid performance and level of regulation.
Shi-lin Chen - One of the best experts on this subject based on the ideXlab platform.
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Fault protection solutions appropriately proposed for ungrounded low-voltage AC Microgrids: Review and proposals
Renewable and Sustainable Energy Reviews, 2017Co-Authors: Duong Minh Bui, Shi-lin ChenAbstract:This paper investigates transient and dynamic characteristics and proposes available fault protection solutions for ungrounded low-voltage (LV) AC Microgrids. Transient characteristics of the ungrounded LVAC Microgrid are surveyed through fault tests and transition tests of the Microgrid operation between the grid-connected and the islanded operation modes. Additionally, dynamic behaviours of the ungrounded LVAC Microgrid are surveyed through motor starting tests and different load conditions. Simulation results under transient and dynamic operation situations are used to evaluate available fault protection solutions proposed for the ungrounded low-voltage AC Microgrids.
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Standards Commonly Used for Microgrids—A Research Project to Develop an Industry Microgrid Standard in Taiwan
Electric Power Components and Systems, 2016Co-Authors: Keng Yu Lien, Shi-lin Chen, Xiao-yan ChengAbstract:AbstractThis article presents standards commonly used for Microgrid technology and practical tests of these standards before developing an industry Microgrid standard. Standards of communication networks, Internet security, data and communications security, installation and protection of distributed generators and energy storage devices, electronic power interfaces of distributed energy resources, and interconnection of Microgrids to electric power system are analyzed. The practical tests for the above standards are planned to perform at a low-voltage (380-V) AC Microgrid test bed built by the Institute of Nuclear Energy Research, Taiwan. Microgrid configurations, installation of distributed generators and energy storage systems, operation conditions of the Microgrid, Microgrid energy management and control systems, and Microgrid protection are mentioned in the proposed standard tests. The main contributions of this article are (i) to review and analyze common standards used for Microgrids, (ii) to presen...
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A novel fault protection system using communication-assisted digital relays for AC Microgrids having a multiple grounding system
International Journal of Electrical Power and Energy Systems, 2016Co-Authors: Keng Yu Lien, Wei Xiang Zhao, Yih Der Lee, Duong Minh Bui, Shi-lin Chen, Yung-ruei Chang, Jheng-lun JiangAbstract:This paper develops a novel fault protection system for AC Microgrids having a multiple grounding system. Communication-supported digital relays which have different protection modules are used for this novel Microgrid protection system. The protection modules in a digital relay have various functionalities to protect AC Microgrids from various fault types, such as: low/high-impedance ground faults and short-circuits. To effectively use the developed novel Microgrid protection system, the first step is to reconfigure different Microgrid structures into a standard Microgrid configuration having a multiple-grounding system through using delta/wye-grounded or wye-grounded/wye-grounded transformers. Then, a fast-dependable-adaptable (FDA) fault protection algorithm is developed to protect AC Microgrids from faults occurring at trunk lines, common buses or branch lines. At an islanded operation mode of AC Microgrids, by using digital relays, a new protection module is designed to detect, locate, and classify the faults occurring at trunk lines and common AC buses, while other protection modules can use the existing protection methodologies (e.g. directional/non-directional overcurrent protection principles, etc.) to detect and clear the faults at source branches or load branches of the Microgrids. At a grid-connected operation mode, standard overcurrent protection modules are applied for the FDA fault protection system. Simulation and experiment results obtained from various fault cases at a real low-voltage AC Microgrid have validated the effective operation of the FDA fault protection system.
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Standards Commonly Used for Microgrids—A Research Project to Develop an Industry Microgrid Standard in Taiwan
Electric Power Components and Systems, 2016Co-Authors: Duong Minh Bui, Keng Yu Lien, Xiao-yan Cheng, Shi-lin Chen, Ming-shan LinAbstract:This article presents standards commonly used for Microgrid technology and practical tests of these standards before developing an industry Microgrid standard. Standards of communication networks, Internet security, data and communications security, installation and protection of distributed generators and energy storage devices, electronic power interfaces of distributed energy resources, and interconnection of Microgrids to electric power system are analyzed. The practical tests for the above standards are planned to perform at a low-voltage (380-V) AC Microgrid test bed built by the Institute of Nuclear Energy Research, Taiwan. Microgrid configurations, installation of distributed generators and energy storage systems, operation conditions of the Microgrid, Microgrid energy management and control systems, and Microgrid protection are mentioned in the proposed standard tests. The main contributions of this article are (i) to review and analyze common standards used for Microgrids, (ii) to present research works from Taiwan to develop a Microgrid standard for industry applications, and (iii) to propose practical tests of critical standards used for Microgrids and how to perform these tests at a real-time low-voltage AC Microgrid in Taiwan.
Michael Zachar - One of the best experts on this subject based on the ideXlab platform.
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Microgrid/Macrogrid Energy Exchange: A Novel Market Structure and Stochastic Scheduling
IEEE Transactions on Smart Grid, 2017Co-Authors: Michael Zachar, Prodromos DaoutidisAbstract:This paper explores the stochastic scheduling of Microgrids where energy exchange with the macrogrid must be coordinated ahead of time. In particular, a market structure is proposed in which Microgrid operators make day-ahead energy exchange commitments. Microgrids are fined for deviating too far from commitments and a maximum difference between commitments in subsequent hours is enforced. These constraints are included to reduce the burden placed on the macrogrid by distributed generation. Under this market structure, a scheduling problem is formulated for a Microgrid system consisting of microturbines, a photovoltaic array, a battery bank, and a bi-directional connection to the macrogrid. Chance-constrained optimization is used to minimize operational cost and ensure the energy exchange commitments are met. The problem is transformed into a mixed integer linear program, and is solved to show that these commitments can be satisfied with a high level of certainty and to illustrate inherent tradeoffs between Microgrid performance and level of regulation.
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Microgrid macrogrid energy exchange a novel market structure and stochastic scheduling
IEEE Transactions on Smart Grid, 2017Co-Authors: Michael Zachar, Prodromos DaoutidisAbstract:This paper explores the stochastic scheduling of Microgrids where energy exchange with the macrogrid must be coordinated ahead of time. In particular, a market structure is proposed in which Microgrid operators make day-ahead energy exchange commitments. Microgrids are fined for deviating too far from commitments and a maximum difference between commitments in subsequent hours is enforced. These constraints are included to reduce the burden placed on the macrogrid by distributed generation. Under this market structure, a scheduling problem is formulated for a Microgrid system consisting of microturbines, a photovoltaic array, a battery bank, and a bi-directional connection to the macrogrid. Chance-constrained optimization is used to minimize operational cost and ensure the energy exchange commitments are met. The problem is transformed into a mixed integer linear program, and is solved to show that these commitments can be satisfied with a high level of certainty and to illustrate inherent tradeoffs between Microgrid performance and level of regulation.
Ebrahim Farjah - One of the best experts on this subject based on the ideXlab platform.
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Power Control and Management in a Hybrid AC/DC Microgrid
IEEE Transactions on Smart Grid, 2014Co-Authors: Navid Eghtedarpour, Ebrahim FarjahAbstract:Hybrid AC/DC Microgrids have been planned for the better interconnection of different distributed generation systems (DG) to the power grid, and exploiting the prominent features of both ac and dc Microgrids. Connecting these Microgrids requires an interlinking AC/DC converter (IC) with a proper power management and control strategy. During the islanding operation of the hybrid AC/DC Microgrid, the IC is intended to take the role of supplier to one Microgrid and at the same time acts as a load to the other Microgrid and the power management system should be able to share the power demand between the existing AC and dc sources in both Microgrids. This paper considers the power flow control and management issues amongst multiple sources dispersed throughout both ac and dc Microgrids. The paper proposes a decentralized power sharing method in order to eliminate the need for any communication between DGs or Microgrids. This hybrid Microgrid architecture allows different ac or dc loads and sources to be flexibly located in order to decrease the required power conversions stages and hence the system cost and efficiency. The performance of the proposed power control strategy is validated for different operating conditions, using simulation studies in the PSCAD/EMTDC software environment.
Duong Minh Bui - One of the best experts on this subject based on the ideXlab platform.
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Fault protection solutions appropriately proposed for ungrounded low-voltage AC Microgrids: Review and proposals
Renewable and Sustainable Energy Reviews, 2017Co-Authors: Duong Minh Bui, Shi-lin ChenAbstract:This paper investigates transient and dynamic characteristics and proposes available fault protection solutions for ungrounded low-voltage (LV) AC Microgrids. Transient characteristics of the ungrounded LVAC Microgrid are surveyed through fault tests and transition tests of the Microgrid operation between the grid-connected and the islanded operation modes. Additionally, dynamic behaviours of the ungrounded LVAC Microgrid are surveyed through motor starting tests and different load conditions. Simulation results under transient and dynamic operation situations are used to evaluate available fault protection solutions proposed for the ungrounded low-voltage AC Microgrids.
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A novel fault protection system using communication-assisted digital relays for AC Microgrids having a multiple grounding system
International Journal of Electrical Power and Energy Systems, 2016Co-Authors: Keng Yu Lien, Wei Xiang Zhao, Yih Der Lee, Duong Minh Bui, Shi-lin Chen, Yung-ruei Chang, Jheng-lun JiangAbstract:This paper develops a novel fault protection system for AC Microgrids having a multiple grounding system. Communication-supported digital relays which have different protection modules are used for this novel Microgrid protection system. The protection modules in a digital relay have various functionalities to protect AC Microgrids from various fault types, such as: low/high-impedance ground faults and short-circuits. To effectively use the developed novel Microgrid protection system, the first step is to reconfigure different Microgrid structures into a standard Microgrid configuration having a multiple-grounding system through using delta/wye-grounded or wye-grounded/wye-grounded transformers. Then, a fast-dependable-adaptable (FDA) fault protection algorithm is developed to protect AC Microgrids from faults occurring at trunk lines, common buses or branch lines. At an islanded operation mode of AC Microgrids, by using digital relays, a new protection module is designed to detect, locate, and classify the faults occurring at trunk lines and common AC buses, while other protection modules can use the existing protection methodologies (e.g. directional/non-directional overcurrent protection principles, etc.) to detect and clear the faults at source branches or load branches of the Microgrids. At a grid-connected operation mode, standard overcurrent protection modules are applied for the FDA fault protection system. Simulation and experiment results obtained from various fault cases at a real low-voltage AC Microgrid have validated the effective operation of the FDA fault protection system.
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Standards Commonly Used for Microgrids—A Research Project to Develop an Industry Microgrid Standard in Taiwan
Electric Power Components and Systems, 2016Co-Authors: Duong Minh Bui, Keng Yu Lien, Xiao-yan Cheng, Shi-lin Chen, Ming-shan LinAbstract:This article presents standards commonly used for Microgrid technology and practical tests of these standards before developing an industry Microgrid standard. Standards of communication networks, Internet security, data and communications security, installation and protection of distributed generators and energy storage devices, electronic power interfaces of distributed energy resources, and interconnection of Microgrids to electric power system are analyzed. The practical tests for the above standards are planned to perform at a low-voltage (380-V) AC Microgrid test bed built by the Institute of Nuclear Energy Research, Taiwan. Microgrid configurations, installation of distributed generators and energy storage systems, operation conditions of the Microgrid, Microgrid energy management and control systems, and Microgrid protection are mentioned in the proposed standard tests. The main contributions of this article are (i) to review and analyze common standards used for Microgrids, (ii) to present research works from Taiwan to develop a Microgrid standard for industry applications, and (iii) to propose practical tests of critical standards used for Microgrids and how to perform these tests at a real-time low-voltage AC Microgrid in Taiwan.
