String Access Detection
Function Description
- Applies to large-scale commercial ground PV plants with PV strings facing the same direction.
- In AC or DC power limiting scenarios:
- If the PV string access type is not identified, the value of PV Status will keep being displayed as Not connected. The PV string access type can be identified only when the inverters restore to the non-power limiting state and the current of all connected PV strings reaches the startup current.
- If the PV string access type has been identified, when some PV strings connected to the 2-in-1 terminals are lost, no alarm will be generated. If some PV strings connected to the 2-in-1 terminals are restored, the access type cannot be identified. It can be determined whether all the 2-in-1 PV strings are restored only when the string current reaches Startup current for 2 in 1 detection.
Procedure
- Log in to the SUN2000 app as Advanced User. The initial password is 00000a.
Use the initial password upon first power-on and change it immediately after login. To ensure account security, change the password periodically and keep the new password in mind. Not changing the initial password may cause password disclosure. A password left unchanged for a long period of time may be stolen or cracked. If a password is lost, devices cannot be accessed. In these cases, the user is liable for any loss caused to the PV plant.
- Choose to go to the parameter setting screen.Figure B-1 String Access Detection
Parameters
No. |
Parameter |
Description |
Remarks |
|---|---|---|---|
1 |
String Access Detection |
The default value is Disable. After the inverter is connected to the power grid, you can set String Access Detection to Enable. |
- |
2 |
Startup current |
When the current of all connected PV strings reaches the preset value, the PV string connection detection function is enabled. NOTE:
Startup current setting rules:
|
This parameter is displayed only when String Access Detection is set to Enable. |
3 |
Startup current for 2 in 1 detection |
When the current of a PV string reaches Startup current for 2 in 1 detection, the PV string is automatically identified as 2 in 1. You are advised to use the default value. |
|
4 |
PV string N access type NOTE:
N is the DC input terminal number of the inverter. |
Set this parameter based on the type of the PV string connected to DC input terminal N of the inverter. Currently, the options are as follows: Automatic identification (default value), Disconnection, Single PV string, and 2 in 1. You are advised to retain the default value. If the value is incorrectly set, the PV string access type may be incorrectly identified and alarms may be generated by mistake for the PV string connection status. |