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A simultaneous change of voltage magnitude and grid impedance may occur during grid faults. To reproduce such impedance variation by converter-based grid emulators, the virtual impedance (VI) control and the virtual admittance (VA) control are two typical approaches. Their dynamics when used with the L-filtered grid emulator are evaluated in this paper. Two major issues, i.e., the inaccuracy of emulated low-frequency (< 50Hz) impedance by the VI control, and the adverse interactions between VA control and its inner current control. Simulation and experimental results of an L-filtered voltage source inverter confirm the correctness of analysis.
|Title of host publication||APEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition|
|Number of pages||6|
|Publication date||31 May 2023|
|Publication status||Published - 31 May 2023|
|Event||APEC 2023 - Orlando|
Duration: 19 Mar 2023 → 23 Mar 2023
|Period||19/03/2023 → 23/03/2023|
- Transient impedance
- low-voltage ride-through
- virtual impedance
- virtual admittance
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15/10/2020 → 14/04/2024
Project: PhD Project