Modeling and Analysis of a Micro-Grid System Powered by Renewable Energy Sources

摘要

Renewable source based micro-generations such as wind and hydro offer the best potential for emission freepower in future power systems. This paper investigates the technical issues related to stable and autonomous operation ofa micro-grid system consisting of renewable power sources. A small hydro generation unit and a wind farm are the mainrenewable power generation units in the proposed micro-grid system. The system under investigation represents a casestudy in Newfoundland and Labrador, Canada. The availability of the utility grid and the intermittent nature of windpower generation are taken into consideration when identifying the operational modes of the proposed micro-grid system.The investigations are carried out through dynamic modeling and simulation of the proposed micro-grid system in differentoperational modes. The components models of the proposed micro-grid system are also presented in this paper. Theinvestigations reveal that appropriate control techniques are required to be developed depending upon the operationalmodes of the proposed system with some additional arrangements. Such arrangements include the type of energy storageunit, reactive power compensation, the management of excess power in the system due to the wind generator etc. The controlconcepts with additional necessities are also outlined in this paper. This paper concludes that the development of suchcontrol concepts is essential to ensure stable and automatic operation of the proposed micro-grid system while maintainingthe system voltage and frequency in their rated values.