One-Cycle Control Strategy with Active Damping for AC-DC Matrix Converter

Abstract

This study presents an input filter resonance mitigation method for an AC-DC matrix converter. This method combines the advantages of the one-cycle control strategy and the active damping technique. Unnecessary sensors are removed, and system cost is reduced by employing the grid-side input currents as feedback to damp out LC resonance. A model that includes the proposed method and the input filter is established with consideration of the delay caused by the actual controller. A zero-pole map is employed to analyze model stability and to investigate virtual resistor parameter design principles. Based on a double closed-loop control scheme, the one-cycle control strategy does not require any complex modulation index control. Thus, this strategy can be more easily implemented than traditional space vector-based methods. Experimental results demonstrate the veracity of theoretical analysis and the feasibility of the proposed approach.

Finite Control Set Model Predictive Control of AC/DC Matrix Converter for Grid-Connected Battery Energy Storage Application

“…The AC input current is set to be in phase with the grid voltage, while its amplitude is indirectly controlled. In [12], the DC voltage controller sets the d-axis AC input current reference and then the AC input current is directly controlled using a one-cycle control strategy without a modulator. In these strategies, the AC side performance greatly depends on the DC side linear controllers.…”