Frequency Regulation Improvement in AC Microgrids: A Fuzzy-Based Extended Virtual Synchronous Generator Control

Integration of power electronic converter interfaced distributed generators (DGs) to microgrids (MGs) decreases the whole inertia of the system. Hence, a significant issue in MGs is the absence of rotational inertia. Low inertia in the MGs makes frequency control a complicated issue, and maintaining frequency stability in MGs is a critical issue. The paper utilizes the extended virtual synchronous generator (VSG) concept to replicate the beneficial dynamic attributes of synchronous generators (SGs) alongside their associated primary and secondary frequency control loops. The extended VSG (E- VSG) is a virtual inertia-based strategy that integrates virtual modules (according to the rotor system, primary, and secondary control loops) to act as a virtual controller for frequency regulation. This paper proposes a new fuzzy logic (FL) based E-VSG to compensate for frequency deviations for an islanded AC MG.