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Fast and Robust Phase Estimation Algorithm for Heavily Distorted Grid Conditions
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DOI：10.1109/TIE.2016.2585078.png)
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Abstract
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This paper proposes a fast and robust phase estimation algorithm (PEA), a counterpart of the phase-locked loop (PLL), for heavily distorted grid conditions. The PEA, named as the WLSE-PEA, consists of the moving average filter (MAF), the weighted least squares estimation (WLSE), the frequency-locked loop (FLL), and the zero crossing detection (ZCD). The MAF can eliminate all the odd-order harmonics in the distorted grid voltages. The WLSE is employed to estimate the fundamental positive-sequence component. The combination of the ZCD and the FLL enables the WLSE-PEA to be adaptive to frequency deviations. Compared with some advanced phase-locked loops, the proposed WLSE-PEA has a faster response. Also, it is robust to common grid disturbances including three-phase unbalances, dc offsets, harmonics, phase jumps, and voltage sags. Simulation and experimental results have verified the effectiveness and advantages of the WLSE-PEA.
Keywords:
Grid synchronization
moving average filter (MAF)
phase estimation algorithm (PEA)
phase-locked loop (PLL)
weighted least squares estimation (WLSE)
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