The design of an impedance measurement system is discussed for application in low-voltage power grids in operation, addressing the presence of the grid voltage. A shunt injection arrangement is preferred, relying then on the measurement of the port voltage and current. A Twin-T passive filter is designed to buffer the isolating injecting transformer, suppressing the 50 Hz fundamental and avoiding excessive magnetizing current and voltage the signal generator connected to the secondary side. Before construction, the system has been simulated and parameters values optimized, showing good performance even with very large-power grids with impedance Zg of tens of mΩ. Zg estimate uncertainty is < 1% at coverage factor k=1.
Design of a low-frequency impedance measurement system applicable to LV grids in live conditions
Mariscotti A.
2025-01-01
Abstract
The design of an impedance measurement system is discussed for application in low-voltage power grids in operation, addressing the presence of the grid voltage. A shunt injection arrangement is preferred, relying then on the measurement of the port voltage and current. A Twin-T passive filter is designed to buffer the isolating injecting transformer, suppressing the 50 Hz fundamental and avoiding excessive magnetizing current and voltage the signal generator connected to the secondary side. Before construction, the system has been simulated and parameters values optimized, showing good performance even with very large-power grids with impedance Zg of tens of mΩ. Zg estimate uncertainty is < 1% at coverage factor k=1.
| File | Dimensione | Formato | |
|---|---|---|---|
|
2025256148.pdf
accesso aperto
Tipologia:
Documento in Pre-print
Dimensione
1.69 MB
Formato
Adobe PDF
|
1.69 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
