Abstract
Microgrid control methods usually have three levels known as hierarchy control method. In this paper, primary and secondary control levels have been evaluated. Conventional droop control is one of the most common primary control methods which regulate frequency and active power well without any communication links, but it cannot regulate voltage and reactive power very well. With this method voltage and frequency of the microgrid will be deviated by changes in load demand. Hence, secondary control levels are used to eliminate this deviation. Centralized and distributed secondary control methods need communication links and reduce system reliability. Therefore, in this paper, decentralized control methods are introduced to improve reactive power-sharing.
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