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This paper proposes a disturbance observer-based control (DOBC) method forfrequency and voltage regulation of a solar photovoltaic (PV)-dieselgenerator(DG) based hybrid microgrid during islanding conditions. The DOBC isintegrated as a feed-forward control to the synchronous generator based DG,which handles real-time power mismatches and regulates the microgrid frequencyand voltage under islanding. To substantiate the operational robustness of thedeveloped controller under real-time uncertainties arising due to variabilityin PV output and load, the controller has been tested under worstcaseuncertainty conditions. The proposed controller has been developed as aMATLAB/Simulink model and the results are validated on the real-time simulatorOPAL-RT. The effectiveness of the proposed control scheme has further beenvalidated in the presence of communication delays and noisy load conditions.Results verify the dynamic performance of the controller in regulating thesystem frequency and voltage for low-inertia microgrids. Finally, the proposedcontrol strategy has been implemented on laboratory scale microgrid setup inwhich synchronous generator based diesel generator regulates system frequencyfast and efficiently under worst case uncertainty scenario.

DOBC-Based Frequency & Voltage Regulation Strategy for PV-Diesel Hybrid Microgrid During Islanding Conditions