| Abstract |
This paper discusses the impedance stability of the grid connected VSI that is built using wide bandgap (WBG), SiC, or GaN semiconductors devices. The use of WBG devices have the benefits of higher switching frequency, lower losses, and smaller size. The impedance stability of the WBG-based VSI is studied under both grid side and inverter side current control. The impedance model of the VSI is developed and validated in Matlab/Simulink. Using this model, the variation of the VSI outputimpedance at increased switching frequencies is studied. The impedance stability is examined for thecase where the VSI is connected at different points in a distribution network. The CIGRE Europeanbenchmark LV network is used. The analysis reveals that the impedance stability of the grid-sidecurrent-controlled WBG-based VSI is improved at higher switching frequencies. Simulation results areprovided for verifying the theoretical analysis. |
