Delta H2.5 - Low Voltage Ride through (LVRT)

6.6 Low Voltage Ride Through (LVRT)
According to CEI 0-21, 8.5.1
To avoid undue separation from the network if voltage dips occur, a generation
system with over 6 kW total power must be able to comply with certain functional
requirements, which are known as LVRT (Low Voltage Ride Through) in
international literature.
Zone 1 : The Inverter doesn't disconnect from the grid.
Zone 2 : The Inverter may temporarily interrupt the supply of active and reactive
power supplied before the breakdown.
Zone 3 : The inverter disconnect from the grid.
100%
0
time( ms)
U
grid
/
U
n
2
1
90%
40%
3
200 400
0%
85%
110%
Figure 6-4 : LVRT characteristic
34
Active/Reactive Power Control and LVRT (Optional)