Low Voltage Ride Through (Lvrt) - Sungrow SG3425UD System Manual

System Manual
Reactive power limitation is performed through the running information sub-menu as
follows:
step 1 Tap "Function" on the default menu.
step 2 Tap "Set-parameter".
step 3 Tap "Run-parameter" after entering the correct password.
step 4 Turn the page down to select the "Q-adjust switch". Tap the pull-down list and there are
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
• QU mode: the reactive power changes with the grid voltage
• V auto-adjust: Voltage automatic adjusting: by setting the "V auto-adj ref(%)", "V auto-adj
hysteresis(%)".
• QP mode: the PF changes with the output power of the inverter
step 5 If Pf is selected, the power factor can be set in the "Run-information" sub-menu;
• if "Q-limit" is selected, the "Q-limit (%)" can be set in the "Run-information" sub-menu.
• if "QU mode" is selected, QU-related parameter can be set on the running parameter
interface, where the parameter name begins with "QU", for example, QU operation mode.
• if "V auto-adjust" is selected, the "V auto-adj ref (%)" and "V auto-adj hysteresis(%)" can
be set on the running paramter interface.
- - End
Improper parameter configuration may affect the normal operation of the inverter!
Only authorized personnel can configure these parameters.
Should any question or doubt occurs, contact Sungrow.

10.4 Low Voltage Ride Through (LVRT)

Technical Requirements for Connecting Photovoltaic Power Station 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.
10 Main Functions
67