Optimized Pulse Patterns for Converters Connected to a Distorted Grid via LCL Filters

This paper presents the computation of optimized pulse patterns (OPPs) for converters connected to the grid via LCL filters. The computed OPPs account for distortions in the grid, such as harmonics injected to the point of common coupling (PCC) by other converters. To this aim, the contribution of different harmonic sources is modeled and included in the OPP optimization problem. By augmenting the said optimization problem with explicit constraints on current and voltage harmonics at the PCC, the computed OPPs ensure that harmonic grid standards are fully met. The presented numerical results demonstrate the superior harmonic performance of the proposed OPPs in the presence of harmonic disturbances.