High performance control of a three-phase PWM rectifier

Abstract

The focus of this research is to investigate and propose solutions for the issues associated with a three-phase boost-type PWM rectifier operating under both balanced and unbalanced supply voltage conditions. The problems identified and the key solutions proposed in this thesis fall under the following four categories. A dual SISO model for the PWM rectifier under balanced operating conditions has first been proposed to exploit the potential benefits of a PWM rectifier under balanced supply conditions. A new output power control (OPC) scheme capable of high input and output performance under balanced supply conditions has then been proposed. In addition, the reason for the existing b partial output power control (POPC) schemeb not fulfilling its promise of good performance was investigated and excellent performance has been achieved with the proposed alternative implementation. Thereafter, the performances obtained with four different power regulation schemes have been evaluated in terms of the obtained EPF, current THDs and peak-peak dc output voltage. Finally, a Hybrid ILC current control has been proposed to achieve high performance current tracking for unbalanced sinusoidal current during both steady-state and transient operations.