Design and implementation of a virtual synchronous generator based microgrid system

In this paper, we will look into the design of virtual synchronous generator (VSG) which are controlled to mimic the characteristics of synchronous generator and the use of grid-controlled converter with virtual inertia which uses energy stored in dc-link capacitors for frequency support. The proposed control scheme involves two control loops, an inner voltage and current controller that is designed in z-domain which ensures system stability and voltage control, while an outer frequency and power controller that is in continuous s-domain, be consistent with current frequency regulation models. With the proposed design system, utilizing various control aims such as voltage support, damping of resonance, minimizing steady-state error, frequency support and virtual inertia, we can design and implement it to determine its feasibility in power system. Simulation result is obtained from a 1000W three phase system with a 3% load increase, to verify the effectiveness of the proposed design modelBachelor of Engineering (Electrical and Electronic Engineering