Parameter Description
Threshold for triggering HVRT
(V)
Species the threshold for triggering HVRT. The threshold
settings should meet the local grid standard.
This parameter is displayed when HVRT is set to Enable.
HVRT gradient K1 During HVRT, the solar inverter needs to generate positive-
sequence reactive power to support the power grid. This
parameter is used to set the positive-sequence reactive power
generated by the solar inverter.
For example, if you set HVRT gradient K1 to 2, the increment
of positive-sequence reactive current generated by the solar
inverter is 20% of the rated current when the AC voltage
increases by 10% during HVRT.
This parameter is displayed when HVRT is set to Enable.
HVRT gradient K2 During HVRT, the solar inverter needs to generate negative-
sequence reactive power to support the power grid. This
parameter is used to set the negative-sequence reactive power
generated by the solar inverter.
For example, if you set HVRT gradient K2 to 2, the increment
of negative-sequence reactive current generated by the solar
inverter is 20% of the rated current when the AC voltage
increases by 10% during HVRT.
This parameter is displayed when HVRT is set to Enable.
Grid voltage protection shield
during VRT
Species whether to shield the undervoltage protection
function during LVRT or HVRT.
This parameter is displayed when LVRT or HVRT is set to
Enable.
VRT exit hysteresis threshold Species the LVRT/HVRT recovery threshold.
● This parameter is displayed when LVRT or HVRT is set to
Enable.
● LVRT recovery threshold = Threshold for triggering LVRT +
VRT exit hysteresis threshold
● HVRT recovery threshold = Threshold for triggering HVRT -
VRT exit hysteresis threshold
Zero current due to power grid
fault
Certain countries and regions have requirements on the output
current during high/low voltage ride-through. In this case, set
this parameter to Enable. After this parameter is set to
Enable, the output current is less than 10% of the rated
current during high/low voltage ride-through.
This parameter is displayed when LVRT or HVRT is set to
Enable.
Active islanding protection Species whether to enable the active islanding protection
function.
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 7 Man-Machine Interactions
Issue 11 (2021-11-10) Copyright © Huawei Technologies Co., Ltd. 94
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