Lvrt - Sungrow SG2500-MV System Manual

System Manual
Turn the page down to select the "Q-adjust switch". Tap the pull-down list and there are
Step 4
three options:

Close: reactive power cannot be adjusted

Pf: adjust the reactive power by setting power factor

Q-limit: adjust the reactive power by setting reactive power percentage
If Pf is selected, the power factor can be set in the "Run-information" sub-menu; if "Q-limit"
Step 5
is selected, the "Q-limit (%)" can be set in the "Run-information" sub-menu.
Improper parameter configuration may affect the normal operation of the inverter!
Only authorized personnel can configure these parameters.
Should any question or doubt occurs, please contact Sungrow.
10.4

LVRT

Technical Requirements for Connecting Photovoltaic Power Inverter to Power System
requires medium-and-large PV plant should be equipped with Low Voltage Ride Through
(LVRT) ability.
LVRT requires: PV plant can operate normally within certain voltage drop range and
duration when the voltage of the grid-connected point drops due to the power system
failure or disturbance; PV plant can provide the dynamic reactive power support during the
period.
Active power recovery
If the power inverter still connects to the grid during power system failure, the active power
will recover from the moment the fault is removed at the speed of at least 30% nominal
power/second.
Dynamic reactive current support
During LVRT, power inverter should feed reactive current to the power system as per
requirements. For a inverter whose 500kV or 750kV voltage is stepped up from the 220kV
or 330kV voltage and then connects to the power inverter group, it should feed reactive
current to the grid when a short-circuit occurs and the voltage drops.
Zero voltage ride through
When the grid-connection point voltage drops to zero, power inverter can operation
normally for 0.15 second.
10 Inverter Functions
71