Abstract
The growing use of power electronic equipment, which generally indicates non-linear behavior, results in the injection of harmonics into the grid. Meanwhile, distributed energy resource systems might impose harmonics on the electrical grid. Hence, appropriate mitigation methods must be applied to improve the quality level of electric power. With the presence of harmonic currents, the fundamental sinusoid is distorted and the harmonic distortion rate increases. Thereby, among the solutions, we can suggest minimizing this problem and integrating a passive filter in parallel to the output of the inverter. This filter represents a weak cost and proves to be suitable for a large power grid connection. In this work, we simulate under Matlab/Simulink and changing environmental conditions of a 100 kW grid-connected photovoltaic system that includes a harmonic filtering system. The boost chopper is controlled by the incremental conductance (IC) type maximum power point tracking (MPPT) algorithm. The latter was selected for maximum utilization of the tested PV system in various illumination and panel temperature. The simulation results showed a remarkable decrease in the harmonic distortion rate of the current delivered to the grid from 639.97% to 18.77% in the Three-phase inverter (VSC) and 15,05% in the Single-phase cascaded H-Bridge five-level inverter, and an improvement in the shape of the current delivered to the grid. This proves the validity of adding a filtering system to reduce the harmonics. Thus, the cascaded H-bridge multilevel inverter is more suitable for photovoltaic applications.
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Khalil, S., Oumidou, N., Cherkaoui, M. (2023). Compensation of Current Harmonic Distortion in a Grid-Connected Photovoltaic System via an LC Filter. In: Motahhir, S., Bossoufi, B. (eds) Digital Technologies and Applications. ICDTA 2023. Lecture Notes in Networks and Systems, vol 668. Springer, Cham. https://doi.org/10.1007/978-3-031-29857-8_63
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