Harmonic control of three-phase AC/DC converter

TL;DR

This paper introduces a harmonic-model based control method for three-phase grid-tied AC-DC converters, effectively reducing harmonic distortion while ensuring global stability through a nonlinear harmonic domain approach.

Contribution

It develops a nonlinear harmonic domain model and translates it into a periodic nonlinear control scheme with stability guarantees, enabling harmonic mitigation and trajectory tracking.

Findings

Effective reduction of Total Harmonic Distortion (THD) demonstrated

Control scheme maintains stability in simulations and experiments

Framework allows incorporation of harmonic-specific control objectives

Abstract

In this paper, we propose a harmonic-model based control approach for the three-phase grid-tied AC-DC converter. We derive a nonlinear harmonic domain model and demonstrate its efficacy in designing harmonic control with global stability guarantees. Furthermore, we establish that this harmonic control design can be translated into a periodic nonlinear control scheme in the time domain, maintaining the same level of stability guarantees. Additionally, the proposed framework allows to incorporate control objectives specifically related to harmonic distortion and harmonic mitigation as well as the tracking of periodic trajectories. Illustrative simulations and experimental setups were conducted to evaluate the effectiveness of the proposed methodology in reducing Total Harmonic Distortion (THD) in real-time. The obtained results demonstrate the successful achievement of the desired control objectives, validating the efficacy of the proposed harmonic control approach.