Abstract

This paper presents a control strategy for a flexible single-phase microgrid that can operate in grid-connected or in islanded mode. The microgrid adopted is composed of two voltage source inverters (VSIs) operated in parallel and two local nonlinear loads. This approach is based on a hierarchical structure which consists of inner, primary and secondary levels. The inner control regulates the output voltage of the VSI. The primary control based on the universal droop control which is recently proposed in the literature. The secondary control compensates the frequency and amplitude deviations caused by the primary control as well as synchronizes the microgrid to the grid for a seamless transition. Finally, simulation results are given, to show the performance and the flexibility of the proposed control scheme during islanded and grid-connected modes, with ensuring a smooth transition between these modes.

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