Solar photovoltaic power conversion system and method of operating the same

A method of operating a solar photovoltaic power conversion system, the solar photovoltaic power conversion system converting a DC input voltage into an AC output voltage, the method comprising following steps:

• (a) providing an input capacitor bank to receive the DC input voltage;
• wherein the input capacitor bank has a first capacitor and a second capacitor, and the first capacitor and the second capacitor are connected to a neutral point;
• (b) providing a first switching circuit connected in parallel to the input capacitor bank;
• wherein the first switching circuit has a first bridge arm and a second bridge arm connected in parallel to the first bridge arm;
• (c) providing a second switching circuit connected in parallel to the input capacitor bank;
• wherein the second switching circuit has a third bridge arm and a fourth bridge arm connected in parallel to the third bridge arm;
• (d) providing a first filtering circuit;
• wherein the first filtering circuit is connected to the first switching circuit and an output side of the first filtering circuit is connected to the neutral point;
• (e) providing a second filtering circuit;
• wherein the second filtering circuit is connected to the second switching circuit and an output side of the second filtering circuit is connected to the neutral point;
• and
• (f) providing a control circuit 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.