Abstract
Dc link-based power conversion is in a stage of transition from diode to controlled rectifier in the front end. An elegant solution is to use a PWM rectifier/inverter system. The most popular control strategies for PWM inverter-fed induction motors are FOC and DTC, which correspond to VOC and DPC for PWM line rectifiers, respectively. Because of duality phenomena, experience with decoupled induction motor control is used to improve performance of the PWM rectifier control because of duality phenomena. This chapter summarizes the main features of four basic control strategies for PWM rectifiers. As has been observed in recent decades, an increasing portion of generated electric energy is converted through rectifiers, before it is used at the final load. In power electronic systems, especially, diode and thyristor rectifiers are commonly applied in the front end of dc-link power converters as an interface with the ac line power (grid). The rectifiers are nonlinear in nature and, consequently, generate harmonic currents in the ac line power. The high harmonic content of the line current and the resulting low power factor of the load cause a number of problems in the power distribution system.
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