Impact of Grid Impedance Variations on Harmonic Emission of Grid-Connected Inverters
arXiv:1612.0204513 citationsh-index: 33
Originality Synthesis-oriented
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For power electronics engineers, this highlights a robustness challenge in inverter filter design due to unpredictable grid conditions.
The paper investigates how variations in grid impedance cause resonance frequency shifts that magnify harmonics in grid-connected inverters, complicating LCL filter design.
This paper addresses harmonic magnification due to resonance circuits resulting from interaction between uncertain grid impedance and converter. The source of harmonic may be either the grid or inverter. It is demonstrated that unknown and unpredictable grid impedance may result in variable resonance frequency, which challenges robust design of LCL filter of inverter.