SOLAR PHOTOVOLTAIC POWER CONVERSION SYSTEM AND METHOD OF OPERATING THE SAME

摘要

A solar photovoltaic power conversion system is provided to convert a DC input voltage into an AC output voltage, which mainly includes an input capacitor bank, a first switching circuit, a second switching circuit, a first filtering circuit, a second filtering circuit, and a control circuit. The first switching circuit has a first power switch and a second power switch. The second switching circuit has a third power switch and a fourth power switch. The control circuit produces a first control signal, a second control signal, a third control signal, and a fourth control signal to respectively control the first power switch, the second power switch, the third power switch, and the fourth power switch so as to reduce leakage current of the DC input voltage caused by parasitic capacitance voltage.

主权项

1. A solar photovoltaic power conversion system converting a DC input voltage into an AC output voltage, the solar photovoltaic power conversion system comprising:
an input capacitor bank having a first capacitor and a second capacitor, and the first capacitor and the second capacitor connected to a neutral point and configured to receive the DC input voltage; a first switching circuit connected in parallel to the input capacitor bank, and the first switching circuit having a first bridge arm and a second bridge arm connected in parallel to the first bridge arm; a second switching circuit connected in parallel to the input capacitor bank, and the second switching circuit having a third bridge arm and a fourth bridge arm connected in parallel to the third bridge arm; a first filtering circuit connected to the first switching circuit, and an output side of the first filtering circuit connected to the neutral point; a second filtering circuit connected to the second switching circuit, and an output side of the second filtering circuit connected to the neutral point; and a control circuit configured to produce a plurality of control signals to control the first switching circuit and the second switching circuit, respectively, to reduce leakage current of the DC input voltage caused by parasitic capacitance voltage.