Journal ArticleDOI
An Adaptive Control System for a Dc Microgrid for Data Centers
Daniel Salomonsson,Lennart Söder,A. Sannino +2 more
- Vol. 44, Iss: 6, pp 1910-1917
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TLDR
In this paper, an adaptive control system for a dc microgrid for data centers is proposed, which coordinates the control of converters, sources and switches used in the DC microgrid.Abstract:
In this paper, an adaptive control system for a dc microgrid for data centers is proposed. Data centers call for electric power with high availability and a possibility to reduce the electric losses and hence the need for cooling. By using local energy sources, high reliability can be achieved, and by using dc the number of conversion steps, and therefore also the losses, can be reduced. The dc microgrid can also be used to supply closely located sensitive ac loads during outages on the utility grid. The proposed dc microgrid can be operated in eight different operation modes described here, resulting in 23 transitions. The adaptive control system coordinates the control of converters, sources and switches used in the dc microgrid. The adaptive control system is tested in the simulation software packages PSCAD/EMTDC, and the results of the most interesting operation modes and transitions are presented. The results show that it is possible to use the proposed dc microgrid to supply sensitive electronic loads, and also during utility grid outages, supply closely located sensitive ac loads. To reduce transients in the voltage experienced by the sensitive ac loads, the dc microgrid requires fast utility outage detection and fast switches.read more
Citations
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Journal ArticleDOI
Hierarchical control of droop-controlled DC and AC microgrids — a general approach towards standardization
TL;DR: The hierarchical control derived from ISA-95 and electrical dispatching standards to endow smartness and flexibility to MGs is presented and results are provided to show the feasibility of the proposed approach.
Journal ArticleDOI
DC Microgrids—Part I: A Review of Control Strategies and Stabilization Techniques
TL;DR: In this paper, a review of control strategies, stability analysis, and stabilization techniques for dc microgrids is presented, where overall control is systematically classified into local and coordinated control levels according to respective functionalities in each level.
Journal ArticleDOI
DC Microgrids—Part II: A Review of Power Architectures, Applications, and Standardization Issues
TL;DR: In this article, an overview of the state of the art in dc microgrid protection and grounding is provided, which discusses both design of practical protective devices and their integration into overall protection systems.
Journal ArticleDOI
Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution
TL;DR: In this paper, a low-voltage bipolar-type dc microgrid is proposed to supply super high quality power with three-wire dc distribution line. But, the proposed system is not suitable for large-scale systems.
Journal ArticleDOI
State of the Art in Research on Microgrids: A Review
TL;DR: This paper presents a review of issues concerning microgrid issues and provides an account of research in areas related to microgrids, including distributed generation, microgrid value propositions, applications of power electronics, economic issues, micro grid operation and control, micro grids clusters, and protection and communications issues.
References
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Journal ArticleDOI
Defining control strategies for MicroGrids islanded operation
TL;DR: In this article, the feasibility of control strategies to be adopted for the operation of a microgrid when it becomes isolated is evaluated and the need of storage devices and load shedding strategies is evaluated.
Journal ArticleDOI
Micro-grid autonomous operation during and subsequent to islanding process
TL;DR: In this paper, the authors investigated preplanned switching events and fault events that lead to islanding of a distribution subsystem and formation of a micro-grid, and they concluded that an appropriate control strategy for the power electronically interfaced DG unit can ensure stability of the microgrid and maintain voltage quality at designated buses, even during islanding transients.
Proceedings ArticleDOI
Autonomous control of microgrids
P. Piagi,Robert H. Lasseter +1 more
TL;DR: In this article, the authors proposed a system approach which views generation and associated loads as a subsystem or a "microgrid" where sources can operate in parallel to the grid or in island, providing UPS services, and the system will disconnect from the utility during large events (i.e. faults, voltage collapses), but may also intentionally disconnect when the quality of power from the grid falls below certain standards.
Journal ArticleDOI
Low-Voltage DC Distribution System for Commercial Power Systems With Sensitive Electronic Loads
D. Salomonsson,A. Sannino +1 more
TL;DR: In this article, the use of DC power system to supply sensitive electronic loads is treated, and general design issues regarding DC power systems are discussed, and then the measurement results from a scaled laboratory setup are presented.
Journal ArticleDOI
Feasibility of a DC network for commercial facilities
TL;DR: In this paper, the feasibility of direct current for the supply of offices and commercial facilities is analyzed by analyzing a case study, i.e., the supply to the Department of Electric Power Engineering, Chalmers University of Technology, Gothenburg, Sweden.