Single-phase Standalone Inverter with an Integrated Control Structure

This paper presents a single-phase standalone inverter with an integrated control structure. The integrated control structure has the function of allowing the implementation of a sliding mode control in a single-phase standalone inverter, the inverter is limited to a switching frequency established by the devices of power. To implement the sliding mode control, the inverter analysis is also required in state variables and the equalization of the limited switching frequency with the PWM averaged modulator. The integrated control structure capable to maintain the waveform of the output voltage, amplitude, and frequency, all of this before load variations and non-linear loads. The results of the integrated control structure are compared with a P-Resonant controller. In the case of a constant load, a ripple is observed in the waveform of the output voltage with a maximum magnitude of 4 V and with the P-Resonant controller, a constant ripple of 5 V. Total Harmonic Distortion of voltage (THD_v) is 3.16% when the nominal power is obtained at full load; with the P-Resonant control, [ THD_v is 8.99%. With non-linear loads, better performance is obtained with the integrated control structure.