Method for improving inner current loop gain control of single-phase full-bridge inversion power supply

The invention discloses a method for improving the inner current loop gain control of a single-phase full-bridge inversion power supply. After the negative feedback calculation, a given voltage VCref of the single-phase full-bridge inversion power supply and a load output voltage Vo pass through a voltage outer loop proportional controller, are outputted and serve as a capacitance current given value iCref. Through the capacitance current given value iCref and a capacitance current iC, the duty ratios of all switching tubes are calculated through a capacitance current prediction control function f(Vdc, Vo, Ts, iC, L). A drive waveform is generated through PWM for controlling the single-phase full-bridge inversion power supply. Through the duty ratios of all switching tubes and a DC input voltage Vdc, an output voltage VD of a single-phase full-bridge inversion power supply side is obtained. Through the negative feedback calculation of the output voltage VD of a single-phase full-bridge inversion power supply side and the load output voltage Vo, an inductance voltage VL is obtained. The integration processing of the inductance voltage VL is carried out through an inductance mathematical model, thereby obtaining an inductance current iL. Through the negative feedback calculation of the inductance current iL and a load current io, a capacitance current iC is obtained. The integration processing of the capacitance current iC is carried out through a capacitance mathematical model, thereby obtaining a load output voltage Vo. The method can effectively inhibit voltage and current distortion caused by a non-linear load.