| Title |
Implementation of the Disturbance-Observer-Based Virtual Impedance to Improve Performance of the Single-Phase Virtual Synchronous Generator |
| DOI |
https://doi.org/10.6113/TKPE.2024.29.2.145 |
| Keywords |
Disturbance observer; Single-phase inverter; VSG(Virtual Synchronous Generator); Virtual inertia; Virtual impedance |
| Abstract |
The performance of a virtual synchronous generator(VSG) depends not only on its inherent parameters, such as inertia and droop coefficients, but also on the output impedance of the inverter. If the output impedance of the inverter is not adequate, the output power of the VSG may fluctuate. In this paper, a method for implementing the virtual impedance based on a disturbance observer(DOB) in a single-phase VSG was proposed. In the proposed method, the output impedance of the inverter can be adjusted by a simple frequency-domain DOB. An output voltage distortion due to the nonlinearity of the inverter was compensated by the DOB. After the basic principle and design method of the proposed DOB were explained, the effectiveness of the proposed method was validated with the hardware-in-the-loop simulation. |