Abstract
Single-phase and three-phase inverters are widely applied to many kinds of power electronic equipments to promote their control performance. However, to obtain high inverter output performance, in addition to the proper match and design for its constituted circuit components, appropriate control is also indispensable. Hence the major purposes of this thesis lie in the establishment of digital signal processor (DSP) based modular inverter and performing their robust waveform control. For facilitating the research concerning inverter modular connection and operation control, the design and implementation of high-performance single-phase inverter module are first made. After designing and realizing the power circuit, its DSP-based control scheme is established. The switching control signals of the inverters are generated from the digital pulse width modulators embedded in the DSP. Both the current and voltage controllers consist of a feedback controller, a command feedforward controller and a simple observer based robust disturbance cancellation controller. Through proper controller design, the established inverter possesses good and robust waveform tracking performance. Secondly, the establishment of three-phase inverters connected by two and three single-phase modules is studied. These include -connected, Y-connected, V-connected and Scott-T connected inverters. The prominent feature of these systems is that all digital controls of the constituted inverter modules are realized using a common DSP. The practical issues and control performance evaluation of the digital controlled inverters are made. Finally, after establishing the inverters having good waveform tracking characteristics, the arbitrary waveform generation and control are performed. The design and implementation for all circuits and control schemes are described in detail. The experimental results show that the developed single-phase and three-phase inverters possess good output performance, including line and load regulations, robust waveform tracking performance under non-linear load and good three-phase output characteristics under unbalanced loads.