Open-Loop Control for Digital Power Electronics

This chapter discusses closed-loop control. All existing converters applied in industrial applications are stable, and they have been working in variable state—stable but shifted—because of the interferences. Closed-loop control is necessary to keep converters working in steady state to satisfy the industrial requirements. Closed-loop control is applied in most industrial applications to keep converters working in steady state to satisfy the industrial requirements. Traditionally, the proportional-plus-integral (PI) control and proportional-plus-integral-plus-differential (PID) control are very popular in closed-loop control systems. PI and PID controllers can be constructed by analog form using operational amplifier (OA). The chapters talks about PI control for AC/DC rectifiers, PI control for DC/AC inverters and AC/AC—AC/DC/AC—converters, and PID control for DC/DC converters.