Work

Harmonic-Constrained Three-Level Optimized Pulse Patterns for Grid-Connected Converters With $LCL$ Filters

Year: 2025

Type: article

Abstract: This paper presents the computation of three-level optimized pulse patterns (OPPs) for converters connected to the grid via$LCL$filters. To this aim, the conventional OPP optimization problem is reformulated to account for the transfer function from the switching signal harmonics to the grid current harmonics. In addition, by incorporating constraints on grid current harmonics into the proposed OPP optimization problem, compliance with harmonic grid standards is ensured. Moreover, the restrictions that are typically imposed on multilevel switching signals,i.e.quarter-wave symmetry and unipolar switch positions, are relaxed in the proposed problem. This relaxation enables a reduction in current harmonic distortions within certain modulation intervals compared to conventional OPPs that do not limit grid current harmonics. The presented numerical results and real-time tests demonstrate the superior harmonic performance of the proposed harmonic-constrained relaxed OPPs, outperforming not only conventional modulation methods, such as space vector modulation (SVM), but also selective harmonic elimination (SHE) and conventional OPPs. Finally, further investigations reveal that the proposed OPPs maintain compliance with harmonic grid standards, even under variations in system parameters or when the$LCL$filter is downsized.

Source: IEEE Transactions on Industry Applications

DOI: 10.1109/tia.2025.3561700

Authors: Shirin Rahmanpour, Petros Karamanakos, Tobias Geyer

Institutions: Tampere University, University of Tampere, ABB (Switzerland)

Language: English

Topic: Multilevel Inverters and Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $2,645