Inverter and DC branch current calibration method thereof

The invention provides an inverter and a direct-current branch current calibration method thereof, the direct-current branch current calibration method comprises a branch calibration process performed on each branch on the direct-current side of an inverter circuit in the inverter, and the branch calibration process comprises the following steps: when a current with a preset current value is injected into a corresponding branch, obtaining a current acquisition result of the corresponding branch; determining a relation parameter between the current acquisition result and a preset current value according to the current acquisition result and the preset current value, and storing the relation parameter; when the inverter is actually connected to the grid, the relation parameter can be called to correct the actual current acquisition result of the corresponding branch, and the corrected branch current can be subsequently applied to perform fault diagnosis, generating capacity control and other ...