Operations Related to the Special User

1

Grid Code

Set this parameter based on the grid code of the country or region where the inverter is used and the inverter application scenario.

2

Isolation settings

Set the working mode of the inverter based on the grounding status at DC side and the connection to the power grid.

3

Output mode

Specifies whether the inverter output has a neutral wire based on the application scenario.

4

Automatically start upon grid recovery

Specifies whether to allow the inverter to automatically start after the power grid recovers.

5

Grid connected recovery time from grid faults (s)

Specifies the time after which the inverter begins restarting after the power grid recovers.

6

Grid reconnection voltage upper limit (V)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid voltage is higher than Grid reconnection voltage upper limit, the inverter is not allowed to reconnect to the grid.

7

Grid reconnection voltage lower limit (V)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid voltage is lower than Grid reconnection voltage lower limit, the inverter is not allowed to reconnect to the grid.

8

Grid reconnection frequency upper limit (Hz)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid frequency is higher than Grid reconnection frequency upper limit, the inverter is not allowed to reconnect to the grid.

9

Grid reconnection frequency lower limit (Hz)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid frequency is lower than Grid reconnection frequency lower limit, the inverter is not allowed to reconnect to the grid.

10

Reactive power compensation (cosφ-P) trigger voltage (%)

Specifies the voltage threshold for triggering reactive power compensation based on the cosφ-P curve.

11

Reactive power compensation (cosφ-P) exit voltage (%)

Specifies the voltage threshold for exiting reactive power compensation based on the cosφ-P curve.

1

Voltage unbalance protection threshold (%)

Specifies the inverter protection threshold when the power grid voltage is unbalanced.

2

10-min overvoltage protection threshold (V)

Specifies the 10-minute overvoltage protection threshold.

3

10-min overvoltage protection duration (ms)

Specifies the 10-minute overvoltage protection duration.

4

Level-N overvoltage protection threshold (V)

Specifies the level-N grid overvoltage protection threshold.

5

Level-N overvoltage protection duration (ms)

Specifies the level-N grid overvoltage protection duration.

6

Level-N undervoltage protection threshold (V)

Specifies the level-N grid undervoltage protection threshold.

7

Level-N undervoltage protection duration (ms)

Specifies the level-N grid undervoltage protection duration.

8

Level-N overfrequency protection threshold (Hz)

Specifies the level-N grid overfrequency protection threshold.

9

Level-N overfrequency protection duration (ms)

Specifies the level-N grid overfrequency protection duration.

10

Level-N underfrequency protection threshold (Hz)

Specifies the level-N grid underfrequency protection threshold.

11

Level-N underfrequency protection duration (ms)

Specifies the level-N grid underfrequency protection duration.

1

LVRT

LVRT is short for low voltage ride-through. When the grid voltage is abnormally low for a short time, the inverter cannot disconnect from the power grid immediately and has to work for some time.

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2

Threshold for triggering LVRT (V)

Specifies the threshold for triggering LVRT. The threshold settings should meet the local grid standard.

This parameter is displayed when LVRT is set to Enable.

3

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.

4

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.

5

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.

6

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 configured in LVRT mode is used.

7

LVRT mode

Sets LVRT mode. The options are Zero-current mode, Constant current mode, Reactive power priority mode, and Active power priority mode.

8

LVRT characteristic curve

Specifies the low voltage ride-through capability of the inverter.

9

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.

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10

Threshold for triggering HVRT (V)

Specifies the threshold for triggering HVRT. The threshold settings should meet the local grid standard.

This parameter is displayed when HVRT is set to Enable.

11

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.

12

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.

13

Grid voltage protection shield during VRT

Specifies whether to shield the undervoltage protection function during LVRT or HVRT.

This parameter is displayed when LVRT or HVRT is set to Enable.

14

VRT exit hysteresis threshold

Specifies 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

15

Grid voltage jump triggering threshold (%)

Specifies the LVRT or HVRT threshold for triggering a transient voltage jump of a power grid. A transient voltage jump indicates that the inverter cannot immediately disconnect from the power grid when the power grid is abnormal due to transient changes.

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16

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.

17

Active islanding protection

Specifies whether to enable the active islanding protection function.

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18

Automatic OFF due to communication interrupted

The standards of certain countries and regions require that the inverter must shut down after the communication is interrupted for a certain time.

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19

Automatic ON due to communication resumed

If this parameter is set to Enable, the inverter automatically starts after communication recovers. If this parameter is set to Disable, the inverter needs to be started manually after communication recovers.

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20

Communication interruption duration (min)

Specifies the duration for determining communication interruption. Used for automatic shutdown for protection in case of communication interruption.

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21

Soft start/boot time (s)

Specifies the duration for the power to gradually increase when the inverter starts.

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22

Soft start time after grid failure (s)

Specifies the time for the power to gradually increase when the inverter restarts after the power grid recovers.

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23

TCP heartbeat interval (s)

Specifies the TCP link timeout period for the solar inverter to connect to the management system.

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24

TCP frame length

Specifies the maximum length of the TCP frame sent by the northbound device to the solar inverter.

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25

Heartbeat period at application layer (min)

Specifies the timeout period for the solar inverter to connect to the management system.

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1

Remote power schedule

If this parameter is set to Enable, the inverter responds to the scheduling instruction from the remote port. If this parameter is set to Disable, the inverter does not respond to the scheduling instruction from the remote port.

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2

Schedule instruction valid duration (s)

Specifies the time for maintaining the scheduling instruction.

When this parameter is set to 0, the scheduling instruction takes effect permanently.

3

Maximum active power (kW)

Specifies the output upper threshold for the maximum active power to adapt to different market requirements.

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4

OFF at 0% power limit

If this parameter is set to Enable, the inverter shuts down after receiving the 0% power limit command. If this parameter is set to Disable, the inverter does not shut down after receiving the 0% power limit command.

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5

Active power change gradient (%/s)

Specifies the change speed of the inverter active power.

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6

Derated by fixed active power (kW)

Adjusts the active power output of the inverter by fixed value.

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7

Derated by active power % (%)

Adjusts the active power output of the inverter by percentage.

If this parameter is set to 100, the inverter outputs based on the maximum output power.

8

Night-time reactive power output

In some specific application scenarios, a power grid company requires that the inverter can perform reactive power compensation at night to ensure that the power factor of the local power grid meets requirements.

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9

Enable reactive power parameters at night

When this parameter is set to Enable, the inverter outputs reactive power based on the setting of Reactive power compensation at night. Otherwise, the inverter executes the remote scheduling command.

This parameter is displayed when Night-time reactive power output is set to Enable.

10

Night-time reactive power compensation (kVar)

During the reactive power compensation at night, the reactive power is scheduled by fixed value.

This parameter is displayed when Night-time reactive power output and Enable reactive power parameters at night are set to Enable.

11

Reactive power change gradient (%/s)

Specifies the change speed of the inverter reactive power.

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12

Plant active power gradient (min/100%)

Specifies the rate of active power rise due to sunlight changes.

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13

Average active power filtering time (ms)

Specifies the period of active power rise due to sunlight changes. This parameter is used with Plant active power gradient.

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14

Power factor

Specifies the power factor of the inverter.

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15

Reactive power compensation (Q/S)

Specifies the reactive power output by the inverter.

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16

Overfrequency derating

If this parameter is set to Enable, the active power of the inverter will be derated according to a certain slope when the grid frequency exceeds the frequency that triggers overfrequency derating.

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17

Frequency for triggering overfrequency derating (Hz)

The standards of certain countries and regions require that the output active power of inverters be derated when the power grid frequency exceeds a certain value.

• This parameter is displayed when Overfrequency derating is set to Enable.
• When setting this parameter, ensure that the following condition is met: Frequency for exiting overfrequency derating ≤ Frequency for triggering overfrequency derating < Cutoff frequency of overfrequency derating.

18

Frequency for exiting overfrequency derating (Hz)

Specifies the frequency threshold for exiting overfrequency derating.

19

Cutoff frequency of overfrequency derating (Hz)

Specifies the frequency threshold for cutting off overfrequency derating.

20

Cutoff power of overfrequency derating (%)

Specifies the power threshold for cutting off overfrequency derating.

21

Power recovery gradient of overfrequency derating (%/min)

Specifies the recovery rate of the overfrequency derating power.

22

PF (U) voltage detection filtering time (s)

Specifies the time for filtering the grid voltage in the PF-U curve.

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23

Apparent power baseline (kVA)

Adjust the apparent output baseline of the inverter.

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24

Active power baseline (kW)

Adjusts the active output baseline of the inverter.

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25

Power percentage for triggering Q-U scheduling

Specifies the reference apparent power, in percentage. When the actual apparent power of the inverter is greater than the value of this parameter, the Q-U characteristic curve scheduling function is enabled.

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26

Q-U characteristic curve

The inverter adjusts Q/S (the ratio of the output reactive power to apparent power) in real time based on U/Un(%) (the ratio of the actual power grid voltage to the rated power grid voltage).

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27

Q-P characteristic curve

The inverter adjusts Q/Pn (the ratio of the output reactive power to the rated active power) in real time based on P/Pn(%) (the ratio of the actual active power to the rated active power).

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28

Cosφ-P/Pn characteristic curve

The inverter adjusts the output power factor cosφ in real time based on P/Pn(%).

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