Lvrt; High Voltage Ride Through (Hvrt) - Sungrow SG500MX Operation Manual

8 Inverter Functions
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.

8.4 LVRT

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 station 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 station should feed reactive current to the power system as per
requirements. For a station whose 500kV or 750kV voltage is stepped up from the 220kV or
330kV voltage and then connects to the power station 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 station can operation normally for
0.15 second.
The inverter meets the abovementioned requirements.

8.5 High Voltage Ride Through (HVRT)

The detailed requirements of HVRT is shown in the following table:
Grid-connection pint voltage
1.1U <U <1.2U
pu T pu
≤U ≤1.3U
1.2U
pu T
Note: UT is the grid-connection point voltage, Upu is the grid-connection point nominal voltage
36
Fig. 8-1 Lower voltage withstand requirements
Requirements
Operate for at least 10s
Operate for at least 0.5s
pu
Operation Manual