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This paper proposes a signal reforming algorithm based three-phase phase-locked loop (PLL) to estimate the phase angles of an unbalanced and harmonics affected three-phase voltage system. This technique transforms the unbalanced waveforms into a balanced one by first attenuating the harmonic components and then balancing the voltage waveforms so that any conventional synchronous reference frame (SRF)...
This paper deals with an enhanced phase locked loop with generalized filtering (GF-EPLL) based control algorithm for a grid interfaced solar photovoltaic (SPV) system. The interface between the SPV array and the grid is realized by a voltage source inverter (VSI). The VSI is implemented for SPV power extraction at high power quality and to feed it into the grid and load connected to it. The IC (Incremental...
In this paper, an efficient and effective method to estimate utility grid harmonics and eliminate their effect during Phase Locked Loop (PLL) phase estimation is proposed. This harmonics estimation algorithm is designed primarily for grid-connected renewable energy systems (RES). The estimation of the grid harmonics is very important for the RES to participate in power quality improvement. The proposed...
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