Virtual generator grid-connected inverter

What are the problems with virtual synchronous generators under a nonideal grid?

There are two significant problems for the virtual synchronous generator (VSG) under the nonideal grid, including power coupling and current distortion. Althoug

What is virtual synchronous generator (VSG)?

Virtual synchronous generator (VSG) can simulate synchronous generator turning and damping characteristics, which can further improve the penetration rate of renewable energy in the grid.

Can a grid-connected inverter perform stably over a typical grid impedance?

Yang et al. proposed an impedance shaping method based on virtual impedances. With this method, the grid-connected inverter can perform stably over a wide range of the typical inductive–resistive grid impedance and exhibit a strong rejection ability of grid-voltage harmonics.

Can a grid-connected inverter improve harmonic suppression?

In this study, an improved control method of the grid-connected inverter is presented to enhance the harmonic suppression. The capacitor-current-feedback-based active damping is applied to the LCL-type grid-connected inverter, which is controlled in the virtual synchronous generator mode.

What is grid-connected control of VSG with virtual impedance?

For this purpose, a strategy of grid-connected control of VSG with virtual impedance is proposed. Firstly, the VSG mathematical model is established and virtual impedance is introduced into the VSG electrical portion to improve the grid-connected inverter output characteristics.

Why is control of grid-connected inverter important?

For the renewable energy generation, the control of grid-connected inverter is of great significance for the power quality. The traditional converter can be divided into voltage-source converter (VSC) and current source converter [9, 10].