Single-phase virtual synchronous generator for distributed energy sources

Virtual synchronous generator (VSG) in single-phase to interface distributed renewable energy is investigated in this paper. Mathematical models and numerical analysis are utilized to illustrate the features of the VSG. Enhanced control strategy is presented to ensure the performance of the VSG. Besides, a second order generalized integer (SOGI) is employed to calculate the instantaneous output power of the VSG in virtual αβ frame. By the means of a phase-locked loop based scheme, the VSG can seamlessly transform between islanded and grid-tied modes, which can meet the requirements of micro-grid. At last, the validity and effectiveness of the proposed approach are verified by the simulated results using PSCAD/EMTDC.