Sensorless AC Current Control with Backstepping Design for a PWM AC-DC Converter

Abstract

In this paper, a novel sensorless AC current control

scheme is proposed for the design of PWM AC-DC converter.

This design strategy deals with nonlinear backstepping

controllers and AC current observer to achieve the purpose of

current following. In general, PWM AC-DC converter design

requires AC current measurement to achieve control goals, the

backstepping observer employed estimates the AC current, and

then nonlinear controllers based on backstepping design

algorithm are developed to realize the sensorless AC current for

the PWM AC-DC converter system. The proposed control

scheme is not only to stabilize the PWM AC-DC converter

system, but also to drive the current tracking error to converge

to zero asymptotically. Furthermore, some simulation results

are shown to illustrate excellent performances of the nonlinear

backstepping control design scheme applied to a PWM AC-DC

converter