Single-phase grid-connected inverter for solar power.

Abstract

The invention relates to a boost inverter device for controlling a single-phase grid. The boost inverter device of the invention has an input solar power source (DC power source 10) and an inverter module, the boost module includes: a boost power switch (1), a boost coil (13), a diode (11) and a capacitor (14). This inverter module includes: power semiconductor switches (2, 3, 4, 5, 6, 7, 8 and 9) configured to switch on / off DC current, producing a seven-level structured single-phase voltage at the output to supply and control the power pumped into the single-phase grid.In which, the inverter module is integrated with an additional capacitor (15) connected in coordination with a diode (12) to perform the function of raising the output voltage step, the central microprocessor (CPU) (16) includes processing software to generate PWM (Pulse Width Modulation) control signals for the power switches to adjust the on / off time of converting DC current to AC current, in which, when the inverter is operating, CPU 16 controls the PWM pulse for the power switches (2, 3, 4, 5, 6, 7, 8 and 9) in the inverter module to increase the output voltage by seven steps.

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