Why does photovoltaic system generate leakage current and what is its harm

The leakage current of the solar power system is essentially common mode current, which is caused by the existence of parasitic capacitance between the photovoltaic system and the earth. When the parasitic capacitance – photovoltaic system – power grid three forms a loop, the common mode voltage will produce common mode current on the parasitic capacitance. When the power frequency transformer is installed in the photovoltaic system, the parasitic capacitance impedance of the transformer windings in the loop is relatively large, so the common mode current produced by the loop voltage of the CCP can be restrained. However, in a photovoltaic system without transformer, the circuit impedance is relatively small, and the common mode voltage will form a larger common mode current on the parasitic capacitance between the photovoltaic system and the earth, that is, leakage current.

The leakage current in the photovoltaic system includes the DC and AC parts. If the grid is connected to the grid, the problems of the grid current distortion and electromagnetic interference will be caused, which will affect the operation of the equipment in the power grid. Leakage current may also cause the inverter housing to be electrified, which will pose a threat to personal safety.

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