A novel control strategy of virtual synchronous generator in island micro-grids

Abstract

The control strategy of virtual synchronous generator (VSG) is an effective and efficient technique to provide frequency supporting for distributed generations. However, the effect of damping is often neglected in a large number of control strategies about VSG. The damping is often used to reduce the active power oscillation, and it relates to the steady-state performance of the system in island micro-grids. This paper analyses the influence of the parameters of damping and inertia on the system in island micro-girds. Furthermore, a hybrid control method of the inertia and the damping is proposed to optimize the frequency curve of the system and enhance the stability of the system. By deploying this method, the decay rate of frequency under load disturbance becomes slower, and the recovery rate of frequency becomes faster after disturbance. Finally, the simulation results show that the proposed method improves the dynamic and static performance of the system in island micro-grids.

Keywords

• Virtual synchronous generator
• the damping
• inertia
• frequency supporting
• island micro-grids
• frequency curve