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Hierarchical power sharing control in DC microgrids

Peyghami, S ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/B978-0-08-101753-1.00003-6
  3. Publisher: Elsevier Inc , 2016
  4. Abstract:
  5. Because of the advances in power electronics, DC-based power systems, have been used in industrial applications such as data centers [. 18], space applications [. 10], aircraft [. 12], offshore wind farms, electric vehicles [. 56], DC home systems [. 5, 20], and high-voltage DC transmission systems. To provide such sensitive loads with more reliability, efficiency, and controllability for future power systems, AC microgrid and more recently DC microgrid and smart-grid technologies have been employed [. 5-9].To obtain stable and optimal operation in DC power systems (microgrids), proper load sharing among different energy units and acceptable voltage regulation across the microgrid is required. This can be achieved by use of a hierarchical power management structure. The highest level in this hierarchy (tertiary) is responsible for the power flow control between the microgrid and the utility grid or among cluster of microgrids or among the converters inside the microgrid. To satisfy the voltage demand of the tertiary control, a secondary control updates the voltage set points for the primary controllers. The secondary controller also restores the voltage drop caused by the primary controller. The primary controller regulates the output voltage of the individual converters to properly control the power/current sharing, provide voltage stability, and prevent circulating current among the converters. In this chapter, this hierarchical power management structure of DC microgrids in both grid-connected and islanded operation and control and modeling of the converters in DC microgrids are studied
  6. Keywords:
  7. Autonomous control ; DC microgrids ; Droop control ; Hierarchical power sharing ; Primary control ; Secondary control ; Tertiary control
  8. Source: Microgrid: Advanced Control Methods and Renewable Energy System Integration ; 2016 , Pages 63-100 ; 9780081012628 (ISBN)
  9. URL: http://www.sciencedirect.com/science/article/pii/B9780081017531000036