Design of different classical controllers in the voltage control loop of a virtual synchronous machine in standalone mode

This manuscript discusses the different classical control methods in the voltage control loop of a voltage source converter (VSC) in standalone mode. In general, a PI controller is used in the voltage control loop of a VSC. In this work, PI, PID, Lead, Lag, Lead-Lead, Lead-Lag, PI-Lead, PI-Lag compensators are applied in the voltage control loop of the VSC. The dynamic analysis and stability of the VSC are presented with step response, bode plot, and eigenvalue analysis. Finally, the virtual synchronous machine (VSM) concept is applied to control the VSC. The main benefit of VSM is the rate of change of frequency (RoCoF) is less compared to conventional droop control. Simulation results are validated the proposed work.