PROJECT TITLE :

Nonlinear Control of Single-PhasePWM Rectifiers With InherentCurrent-Limiting Capability - 2016

ABSTRACT:

In this paper, a nonlinear controller with a current-limiting property is proposed to guarantee accurate dc output voltage regulation and unity power factor operation for single-phase pulse-width-modulating rectifiers while not the necessity of a section-locked-loop (PLL). The proposed current-limiting controller is absolutely freelance of the system parameters and will guarantee asymptotic stability and convergence to a unique resolution for the closed-loop system using nonlinear control theory. While not requiring the instantaneous measurement of the grid voltage, a PLL, an external limiter, or a saturation unit, the proposed strategy guarantees that the input current of the rectifier will always remain below a given price. An analytic framework for selecting the controller parameters is also presented to provide a complete controller style procedure and it's also proved that this-limiting property is maintained even when the grid voltage drops. Extensive experimental results are presented to verify the proposed controller when the load changes, the reference dc output voltage changes, and the grid voltage drops.