Operations Related to the Advanced User
Ensure that the DC side of the SUN2000 is energized before setting grid parameters, protection parameters, and feature parameters.
Setting Grid Parameters
Procedure
- Choose to set grid parameters.Figure 7-8 Grid parametersTable 7-1 Grid parameters
Parameter
Description
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.
Isolation settings
Set the working mode of the inverter based on the grounding status at DC side and the connection to the power grid.
Setting Protection Parameters
Procedure
- Choose to set protection parameters.Figure 7-9 Protection parametersTable 7-2 Protection parameters
Parameter
Description
Insulation resistance protection threshold (MΩ)
To ensure device safety, the SUN2000 detects the insulation resistance between the input side and the ground when it starts a self-check. If the detected value is less than the preset value, the SUN2000 does not export power to the power grid.
Setting Feature Parameters
Procedure
- Choose , and set feature parameters.Figure 7-10 Feature parametersTable 7-3 Feature parameters
Parameter
Description
MPPT multi-peak scanning
When the inverter is used in scenarios where PV strings are greatly shaded, set this parameter to Enable, and then the inverter will perform MPPT scanning at regular intervals to locate the maximum power.
MPPT multi-peak scan interval (min)
Specifies the MPPT scanning interval.
This parameter is displayed when MPPT multi-peak scanning is set to Enable.
RCD enhancement
RCD refers to the residual current of the inverter to the ground. To ensure device and personal safety, RCD should be limited to the specified value in the standard. If an AC switch with a residual current detection function is installed outside the inverter, this function should be enabled to reduce the residual current generated when the inverter is running, thereby preventing the AC switch from misoperations.
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.
This parameter is displayed when Isolation settings is set to Input ungrounded, with TF.
PID protection at night
When the inverter outputs reactive power at night and this parameter is set to Enable, the inverter will shut down automatically if it detects abnormal status of the PID compensation.
Power quality optimization mode
If this parameter is set to Enable, the inverter output current harmonics will be optimized.
PV module type
This parameter is used to set different types of PV modules and the shutdown time of the concentration PV module. If the concentration PV modules are shaded, the power drops drastically to 0 and the inverter shuts down. The energy yield would be affected since it takes too long for the power to resume and inverter to restart. The parameter does not need to be set for crystalline silicon and filmy PV modules.
- If this parameter is set to Crystalline silicon or Film, the inverter automatically detects the power of PV modules when they are shaded and shuts down if the power is too low.
- When concentration PV modules are used:
- If this parameter is set to CPV 1, the inverter can quickly restart in 60 minutes if the input power of PV modules drops drastically due to shading.
- If this parameter is set to CPV 2, the inverter can quickly restart in 10 minutes if the input power of PV modules drops drastically due to shading.
Built-in PID compensation direction
When the external PID module compensates the PID voltage for the PV system, set Built-in PID compensation direction to the actual compensation direction of the PID module so that the inverter can output reactive power at night.
This parameter is displayed when PV module type is set to Crystalline silicon. Select PV–positive offset for P-type PV modules. Select PV+ negative offset for N-type PV modules.
String connection mode
Specifies the connection mode of PV strings.
- When PV strings connect to the inverter separately (All PV strings separated), there is no need to set this parameter. The inverter can automatically detect the connection mode of the PV strings.
- When PV strings connect to one another in parallel outside the inverter and then connect to it independently (All PV strings connected), set this parameter to All PV strings connected.
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.
If Automatic OFF due to communication interrupted is set to Enable and the inverter communication is interrupted for a specified time (set by Communication interruption duration), the inverter will automatically shut down.
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.
This parameter is displayed when Automatic OFF due to communication interrupted is set to Enable.
Communication interruption duration (min)
Specifies the duration for determining communication interruption. Used for automatic shutdown for protection in case of communication interruption.
Soft start/boot time (s)
Specifies the duration for the power to gradually increase when the inverter starts.
Shutdown gradient (%/s)
Specifies the power change speed when the inverter shuts down.
Night-time hibernation
The inverter monitors PV strings at night. If this parameter is set to Enable, the monitoring function of the inverter will hibernate at night to reduce power consumption.
MBUS communication
For inverters that support RS485 communication and MBUS communication, you are advised to set this parameter to Disable to reduce power consumption.
Delay upgrade
This parameter is mainly used in the upgrade scenarios where the PV power supply is disconnected at night due to no sunlight or unstable at dawn or dusk due to poor sunlight.
After the inverter starts to upgrade, if Delay upgrade is set to Enable, the upgrade package is loaded first. After the PV power supply recovers and the activation conditions are met, the inverter automatically activates the upgrade.
RS485-2 communication
If this parameter is set to Enable, the RS485-2 port can be used. If the port is not used, you are advised to set this parameter to Disable to reduce power consumption.
Tracker controller
Selects a controller vendor.
Duration for determining short-time grid disconnection (ms)
The standards of certain countries and regions require that the inverter should not disconnect from the power grid if the power grid experiences a short-time failure. After the fault is rectified, the inverter output power needs to be quickly restored.
AFCI
The North American standard requires that the inverter should have DC arc detection function.
Auto recovery from string-to-ground short-circuit protection
- If this parameter is set to Enable, the String Short-Circuited to Ground alarm is automatically cleared after fault recovery.
- If this parameter is set to Disable, the String Short-Circuited to Ground alarm cannot be automatically cleared. You need to manually clear the alarm.
Built-in PID Recovery
Ensure that the inverter ground cable is securely connected. Otherwise, the built-in PID repair function will be affected and electric shocks may occur.
Working Principle
When the SUN2000 is disconnected from the network, the built-in PID can repair the PV– positive offset. (PV– positive offset refers to raising the voltage between PV– and the ground to above 0 V through voltage compensation.) When designing a PV plant, confirm with the PV module manufacturer that the anti-PID voltage compensation direction of the PV module is the PV– positive offset. Otherwise, PV modules may be damaged.
Procedure
- Choose . The parameter setting screen is displayed.Figure 7-11 Built-in PID RecoveryTable 7-4 Parameters settings
Parameter
Description
PID running mode
Specifies the operation mode of the inverter built-in PID.
PID nighttime off-grid repair
Specifies whether to enable the PID nighttime off-grid repair.
If PID running mode is not set to Disable, the parameter can be set.
PID daytime off-grid repair
Specifies whether to enable the PID daytime off-grid repair.
If PID running mode is not set to Disable, the parameter can be set.
AFCI
Function
If PV modules or cables are incorrectly connected or damaged, electric arcs may be generated, which may cause fire. Huawei SUN2000s provide unique arc detection in compliance with UL 1699B-2018 to ensure the safety of users' lives and property.
This function is enabled by default. The SUN2000 automatically detects arc faults. To disable this function, log in to the FusionSolar app, enter the Device commissioning screen, choose , and disable AFCI.
The AFCI function works only with Huawei optimizers or ordinary PV modules when the SUN2000 is connected to the grid, but does not support third-party optimizers or intelligent PV modules.
Clearing Alarms
The AFCI function involves the DC arc fault alarm.
The SUN2000 has the AFCI alarm automatic clearance mechanism. If an alarm is triggered for less than five times within 24 hours, the SUN2000 automatically clears the alarm. If the alarm is triggered for five times or more within 24 hours, the SUN2000 locks for protection. You need to manually clear the alarm on the SUN2000 so that it can work properly.
You can manually clear the alarm as follows:
- Method 1: FusionSolar appLog in to the FusionSolar app and choose . On the Device commissioning screen, connect and log in to the SUN2000 that generates the AFCI alarm, tap Alarm management, and tap Clear on the right of the DC arc fault to clear the alarm.Figure 7-12 Alarm management
- Method 2: FusionSolar Smart PV Management System
Log in to the FusionSolar Smart PV Management System using a non-owner account, choose , select the DC Arc Fault Clearance alarm and click OK.
Figure 7-13 Clearing alarmsSwitch to an owner account with plant management rights. On the Home page, click the plant name to go to the plant page, and click OK as prompted to clear the alarm.
