A new hybrid current controller for single-phase rectifier and DSP implementation.

摘要

A new hybrid carrier-based current controller is described for single-phase PWM rectifiers. It combines the functionality of both hysteresis-based and carrier-based current controllers. The development of this current controller is described with the aid of generic PWM controllers that use a sinusoidal modulating signal and a signal integrator.; The resultant current controller is relatively insensitive to variations in rectifier parameters such as the supply inductance and the DC link voltage magnitude, and has the following features: constant switching frequency; a near zero current-error over a PWM half cycle; no skewing effects in the current-error signal; excellent current wave shaping capability; real-time generation of the sinusoidal amplitude modulation signal from the PWM signal; elimination of phase-shifts caused by the limited rate-of-change of the rectifier current.; A DSP controller ADSP-21992 is used to execute the control algorithm and generate the PWM switching signals based on the feedback signals applied to the DSP ADC port to drive the single-phase rectifier.