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10.6 High Voltage Ride Through (HVRT)
Technical Requirements for Connecting Photovoltaic Power Station to Power System
requires PV plant should be able to 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;
U
pu
is the grid-connection point nominal voltage.
figure 10-3
High voltage withstand requirements
Note: T1, T2, U1, and U2 are all settable parameters.
Sungrow’s MV Staion meets the abovementioned requirements.
10.7 Self-constructed Grid
In the early stage of power station commissioning, when the inverter has no AC power or the
grid cannot transmit power for some reason, the on-site equipment can not be
commissioned because there is no power supply. At this time, the inverter's self-constructed
grid function can be enabled. By controlling the inverter to work in high-voltage and low-
voltage modes, AC power supplies of different voltage levels are constructed to supply
power to the equipment debugging, which facilitates on-site communication and joint
debugging, thereby shortening the pre-commissioning time of the power station.
10.7.1 Low Voltage Mode
Applicable Scenario
The low-voltage mode is suitable for powering debugging tools and test equipment when the
grid cannot transmit power.
System Manual
