Background:
In many low-voltage grid-tied (380 V) scenarios, the inverter frequently reports power grid overvoltage alarms (alarms 301 and 2034) and the inverter is in standby state. The power grid detection fails, which affects the power generation of the system.
For the preceding problems, use a multimeter to measure the AC grid-tied voltage. If the AC grid-tied voltage is abnormal, the voltage is high. The procedure is as follows:
1. If a power grid overvoltage alarm is generated, check whether the power grid standard code of the inverter is NB/T 32004. If not, change the power grid standard code to NB/T 32004.
2. If the power grid code is correct, enter a special user and perform the following steps to increase the inverter overvoltage protection threshold and 10-minute overvoltage protection threshold (the actual grid-tied voltage can be increased by about 10–20 V):
3. Check whether the inverter high-voltage traversal protection is disabled. If it is not disabled, log in to the system as a special user and perform the following steps:
2. If the SUN2000 is always in standby mode, go to the main menu and choose Settings > Power grid parameters to check the upper limit of the SUN2000 power grid reconnection voltage.
In conclusion, the SUN2000 generates an alarm indicating that the grid voltage is high and the SUN2000 is in standby mode. If the grid detection fails, check whether the grid-tied voltage of the SUN2000 is abnormal. Then, modify the grid parameters and feature parameters to check whether the SUN2000 can connect to the grid properly. If the fault persists, contact Huawei inverter sales personnel.
