Abstract:

In order to improve the dynamic characteristics, robustness and anti-disturbance performance of Buck DC-AC inverters, a double-loop controller with current feedforward is presented. In this controller, the full-state feedback scheme is adopted to implement the double-loop control of voltage and current, thus improving the dynamic response as well as the steady-state performance of the inverter system. Moreover, a current feedforward loop is em- ployed to improve the anti-disturbance performance of the inverter system. Experimental results indicate that the inner loop in the double-loop controller enlarges the bandwidth of the inverter control system, quickens the dynamic response, increases the steady-state precision, and restrains the load turbulence.

Key words: Buck converter, double-loop control, inverter, dynamic response