Abstract
As a common interface circuit for the medium- and low-voltage DC power distribution system integrated to the grid, three-phase voltage source converter plays an important role in system operation. To solve the instability problem of the grid-connected converter with the DSOGI-PLL(Double Second Order Generalized Integrator-Phase Locked Loop) in weak grid, the frequency coupling impedance model of DSOGI-PLL is firstly established, and then the frequency coupling impedance model of the grid-connected converter considering a variety of frequency coupling factors is built. Based on this model, the effects of DSOGI-PLL parameters, DC voltage loop bandwidth and current inner loop bandwidth ratio on the frequency coupling characteristics of grid-connected converter are analyzed. Then, the equivalent single-input single-output Nyquist stability criterion considering the frequency coupling characteristics is derived, and the influence of various factors on the stability of the grid-connected converter system is studied. Finally, based on the MATLAB/Simulink, the frequency coupling impedance model and system stability are simulated and verified, which proves the accuracy of the proposed frequency coupling impedance model and the theoretical analysis.
| Translated title of the contribution | Frequency coupling impedance modeling and stability analysis of grid-connected converter based on DSOGI-PLL in weak grid |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 112-117 |
| Number of pages | 6 |
| Journal | Dianli Zidonghua Shebei/Electric Power Automation Equipment |
| Volume | 42 |
| Issue number | 5 |
| DOIs | |
| State | Published - 10 May 2022 |