Abstract

Microgrids can operate in two modes, grid-connected and islanded modes. The flexible operation of the microgrid in islanded mode depends on the reliable and perfect control system, therefore, the emphasis and difficult of the microgrid research is the system control problems. It so important to apply an efficient control method to adjust the system voltage and frequency under the islanded operation of microgrid. Droop control is one of the simpler method to control the voltage and frequency under this case. It can be used to adjust the system voltage and frequency to their acceptable limits. Unfortunately, this method is not so accurate in maintaining the system voltage and frequency close to their nominal values. This paper presents a proposed modified V/f droop control method for Microgrids in Islanded mode. The method applies H ∞ with the droop controller to adjust the system voltage and frequency to their nominal values. The proposed method is verified by applying it to a test system simulated in Matlab/Simulink environment. The comparison between the conventional and the proposed method prove that the proposed method is more efficient in controlling microgrid under islanded mode of operation.

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