Sungrow SG3425UD - High Voltage Ride through (HVRT)

68
Active Power Recovery
If the power station still connects to the grid during power system failure, the active power
will recover on the moment the fault is removed at the speed of at least 30% of 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, the power station can operate
normally for 1 second.
U
T
is the grid-connection point voltage; Upu is the grid-connection point nominal voltage.
figure 10-1 Low voltage withstand requirements
Note: T1, T2, U1, and U2 are all settable parameters.
Sungrow’s inverter meets the abovementioned requirements.
10.5 High Voltage Ride Through (HVRT)
Technical Requirements for Connecting Photovoltaic Power Station to Power System
requires that the PV plant can operate as required within certain voltage range.
Grid-connection pint voltage Requirements
1.1U
pu
<U
T
<1.2U
pu
Operate for at least 10s
1.2U
pu
≤U
T
≤1.3U
pu
Operate for at least 0.5s
Note: U
T
is the grid-connection point voltage; Upu is the grid-connection point nominal
voltage.
10 Main Functions System Manual