ABSTRACT
AC-to-DC family of converters constitutes the interface circuit between the network and the loads. žese converters are known by single-phase or three-phase active rectiŸers. žey do play an important role in controlling the energy transfer from the utility to the load and vice versa. With the ever increase of power quality requirement at the point of common coupling with the network, AC-to-DC converters are nowadays required to achieve di¦erent tasks such as: provide high input power factor, low line current distortion [1-3], Ÿxed output voltage and robustness to load, and utility voltage unbalances. Several topologies that satisfy these requirements have been studied [4-6]. Among these structures, one can recall the six-switch rectiŸer shown in Figure 12.1, which is the most conventionally used topology for bidirectional power ¹ow applications [7,8]. It is characterized by high performance in terms of input power factor and DC voltage regulation, but at the cost of a high number of hard-switching devices,
12.1 Introduction .................................................................................... 12-1 12.2 Overview on Modeling Techniques Applied
12.3 Study of a Basic Topology: že Single-Phase, Single-Switch, žree-Level RectiŸer ............................................12-9
12.5 Averaged Model-Based Multi-Loop Control Techniques Applied to the žree-Phase/Switch/Level PWM Boost RectiŸer ..........................................................................................12-34 Linear Control Design • Nonlinear Control Design • Simulation Results • Comparative Evaluation
12.6 Conclusion .....................................................................................12-45 References ..................................................................................................12-45
yielding relatively high-power losses and consequently a relatively low e¢ciency. To a certain extent, this topology has no competitor in the applications where a bidirectionality of the power ¹ow is required.
