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This paper originally analyzes the effect of the harmonics, dc offsets, and unbalance on the three-phase enhanced phase-locked loop (3P-EPLL). It proves that 3P-EPLL is not able to accurately estimate the amplitude, phase angle, and frequency of the grid in such cases. In order to correctly estimate the grid synchronous information even under the nonideal grid conditions, an improved 3P-EPLL combined...
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