An Inductor Current Sensorless Control Strategy Based on Modified VSG Method for Single-Phase Microgrid Application With Seamless Transfer Capability

This paper proposes an inductor current sensorless control strategy based on modified virtual synchronous generator (VSG) method for single-phase inverter-interfaced microgrid application. Firstly, the outer power loop with Q-U integral term is presented output reactive enhancement, and inner voltage regulation luenberger state observer proposed to reduce sensor. Meanwhile, in order improve response speed of observer, designed optimal pole assignment method. Secondly, a seamless switching VSG proposed, which can realize transition between island mode grid-connected mode. Finally, 3kW prototype built, effectiveness correctness verified by simulation experimental results.