Study on digital multiple-loop control technology of inverters

This paper presents a digital multiple-loop control technology of inverters. The scheme incorporates a current loop with an instantaneous voltage loop, while a repetitive control outer loop is added. Since both an output voltage decoupling mechanism and a load disturbance compensation have been added, the current loop and instantaneous voltage loop controller is designed through deadbeat theory, so that the inverter's dynamic performance is much improved, and the repetitive control outer loop improves the steady-state performance. The scheme is proved on a PWM inverter whose control system is based on DSP TMS320F240.