At present, leak current suppression technology has become a hot issue in the research of photovoltaic grid-connected systems. Research institutes and manufacturers are studying on it. The magnitude of leak current depends on the parasitic capacitance Cpv between photovoltaic PV and earth, as well as the change rate of the common mode voltage.
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Presented at the 31 st European PV Solar Energy Conference and Exhibition, 14-19 September 2015, Hamburg, Germany Quantitative assessment of the local leakage current in PV modules
Leakage current of the photovoltaic system, which is also known as the square matrix residual current, is essentially a kind of common mode current. The cause is that there is parasitic capacitance between the photovoltaic system and the earth.
And it has an extremely high precision requirement, a special current sensor is required. The photovoltaic standard stipulates that for the detection of photovoltaic leakage current, Type B, that is, a current sensor capable of measuring both AC and DC leakage currents, must be used.
In addition, leak current can also electrify the solar inverter casing, thus threatening physical safety. Standard and detection of leakage current
1. Entire H4 bridge topology In order to solve the problem of leakage current in a full H-bridge PV inverter, bipolar PWM modulation can be used.
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