Active resonance damping in LCL-filtered invertersbased islanded microgrids
Résumé
This paper addresses resonance damping in islanded MicroGrids (MG) wherein the use of passive filters like LC and LCL for switching harmonic attenuation brings multiple resonances with shifting frequencies. These resonances can lead to current and voltage harmonics amplification, which can results in major power quality and stability issues. For this aim, a hierarchical control strategy with an active damping method is proposed to control the MG operation and dampen out the undesired resonance amplifications. The proposed method uses a filter based approach with a virtual resistive impedance to reconstruct and compensate for the undesired resonance harmonics. This method shows relevant performances for resonance damping improving power quality and stability in islanded MGs. Experimental results and discussions are provided.
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