Parameter Description
Threshold for triggering LVRT
(V)
Species the threshold for triggering LVRT. The threshold
settings should meet the local grid standard.
This parameter is displayed when LVRT is set to Enable.
LVRT gradient K1 During LVRT, 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 LVRT 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
decreases by 10% during LVRT.
This parameter is displayed when LVRT is set to Enable.
LVRT gradient K2 During LVRT, 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 LVRT 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
decreases by 10% during LVRT.
This parameter is displayed when LVRT is set to Enable.
Percentage of LVRT reactive
current limiting
During LVRT, the solar inverter needs to limit the reactive
current.
For example, if you set Percentage of LVRT reactive current
limiting to 50, the reactive current upper limit of the solar
inverter is 50% of the rated current during LVRT.
This parameter is displayed when LVRT is set to Enable.
Threshold of LVRT zero-current
mode
When Zero current due to power grid fault is enabled, if the
power grid voltage is less than the value of Threshold of LVRT
zero-current mode during LVRT, the zero current mode is
used. Otherwise, the mode congured in LVRT mode is used.
This parameter is displayed when LVRT is set to Enable.
LVRT mode Sets LVRT mode. The options are Zero-current mode,
Constant current mode, Reactive power priority mode, and
Active power priority mode.
This parameter is displayed when LVRT is set to Enable.
LVRT characteristic curve Species the low voltage ride-through capability of the
inverter.
HVRT HVRT is short for high voltage ride-through. When the grid
voltage is abnormally high for a short time, the inverter
cannot disconnect from the power grid immediately and has
to work for some time.
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 7 Man-Machine Interactions
Issue 11 (2021-11-10) Copyright © Huawei Technologies Co., Ltd. 93
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