Parallel Operation of Virtual Synchronous Generator for Islanded Microgrid System

This paper presents the parallel operation of a Virtual Synchronous Generator (VSG) on an islanded microgrid system. The parallel operation of VSG must be able to carry out well-coordinated load sharing so that system stability is maintained. This makes the system more complex in the control strategy used. In this study, a control strategy is proposed for the parallel operation of VSGs using P-f droop control and Q-V droop control on each VSG. P-f droop control generates the frequency and angle for the internal voltage from VSG. Q-V droop control produces a voltage deviation for the voltage reference on the d-q frame. This control strategy allows VSG to carry out load sharing while maintaining the dynamic stability of the microgrid system. Based on the simulation results, VSG is able to operate in parallel in a microgrid system under normal conditions and when there is a change in load without disturbing the dynamic stability of the system.