Design of three-loops control for inverter based on DSP

Aimed at the voltage wave distortion of inverter and the reduction of output voltage magnitude when the load is heavy,a design of the inverter power supply which uses the three-loop control with the effective value outer loop,the output voltage loop and the inductance current inner loop was introduced.DSP TMS320F2812 produced by TI corporation was selected to carry out this scheme,the program flow chart and the process of inverter design were presented.A SPWM inverter(6 kVA/50 Hz /220 V) based on the simulation and experimental course with the parameters was designed,the results demonstrate the parameters selection is precise and the applied method actualized by DSP has nicer dynamic and steady characteristic when the inverter power is worked in the condition of heavy load.