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DVR control requires a robust algorithm for computing grid voltage magnitude and phase angle. Conventional SRF-PLL performs poorly as it cannot filter out negative sequence voltages and harmonics that could occur in the grid voltage. In this paper a Positive and Negative Sequence Extractor (PNSE) is formed by a Delayed Signal Cancellation (DSC) filter, which filters harmonics and extracts Instantaneous...
Accurate estimation of grid phase angle and magnitude is important for effective operation of Dynamic Voltage Restorer (DVR). Under unbalanced voltage sags, the estimated output voltages of a conventional SRF-PLL contain a second harmonic ripple which makes it difficult to control DVR. In this paper a DSOGI pre-filter based PLL is employed to extract the symmetrical components of the grid voltage...
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