The rectifier stage of the inverter converts AC line voltage to DC. If the input AC voltage is higher than nominal, the resulting DC bus voltage will also be higher. For a three-phase inverter, DC bus voltage ≈ √2 × AC line-to-line RMS voltage (e.g., 400 V AC yields ~565 V DC).
The AC voltage overrange is the most common failure of the solar inverter connected with the PV grid system. This is because the grid voltage is not constant and it will change with the changing of the load and current. At the same time, the output voltage of the inverter will be affected by the grid voltage.
When the inverter is connected to the grid-connected voltage range, the inverter will display the grid overvoltage. In addition, the cable used by the inverter to the grid point is too long, too thin, entangled or the material is not in compliance, which will lead to an increase in the voltage difference at the AC terminal of the inverter.
If the grid-connected inverter is too far away from the grid connection point, the voltage difference on the AC terminal side of the inverter will increase. When the inverter is connected to the grid-connected voltage range, the inverter will display the grid overvoltage.
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Try to shorten the length of the AC output line of the inverter as much as possible, or use thicker copper core cables to reduce the voltage difference between the inverter and the grid.
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Abstract: Inverters are used in a large number of power applications. The function of an inverter is to convert DC power to AC, these are referred to as Voltage Source Inverters …
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If the input AC voltage is higher than nominal, the resulting DC bus voltage will also be higher. For a three-phase inverter, DC bus voltage ≈ √2 × AC line-to-line RMS voltage …
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Knowing the truth about VFD operation can simplify the selection process for choose a variable frequency drive.
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