SINGLE-PHASE TO SINGLE-PHASE BACK-TO-BACK CONVERTER

Single-phase two-stage energy conversion systems are considered in this chapter. Such conversion systems, also known as back-to-back converters, deal with rectification and inversion through a direct link (dc)-link capacitor. This chapter describes the full-bridge topology for single-phase ac-dc-ac conversion. In addition to the model, pulse width modulation (PWM), and control strategies, a power analysis and an expression for the dc-link capacitor oscillation are also presented in the chapter. The chapter deals with nonconventional topologies, that is, topologies with reduced and increased number of power semiconductor devices. Semiconductor component count reduction is obtained by either sharing a leg or by using the dc-link mid-point connection. Topologies with increased number of components are addressed by connecting back-to-back converters both in parallel and series. This will allow THD improvements and reducing power processed by each converter.