| 摘要 |
Provided are a non-isolated photovoltaic grid-connected inverter and a control method therefor. The inverter comprises a power source circuit (10), a high-frequency chopper circuit (20), and a low-frequency inverter circuit (30). The power source circuit (10) is constituted of a photovoltaic array (PV) and an input filter capacitor (Cin). The high-frequency chopper circuit (20) is constituted of first and second power switch transistors (S1 and S2), a first diode (D1), and first and second filter inductors (L1 and L2). The low-frequency inverter circuit (30) is constituted of third, fourth, fifth, and sixth power switch transistors (S3, S4, S5, and S6). The first and second power switch transistors (S1 and S2) switch at a high frequency; the third to the sixth power switch transistors (S3, S4, S5, and S6) switch at a low frequency. The inverter eliminates leakage current for the grid-connected inverter, improves the waveform quality of a grid-connected current, and has the advantages of great efficiency, simple control, and great reliability. |
