Control method with digital PI dual close-loop for inverter

In this paper the characteristic of digital control and the real condition of inverter is analyzed, and then a digital control scheme of PI dual-loop of inverter is presented. The parameters of control system are designed by the method of pole configuration, and the state observer is designed according to the real model. The Bode plots under the condition of open loop and close loop are given. In order to verify the theory analysis a prototype is set up. The experimental waveforms show that there are good characteristics in the control system with the presented method .