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Novel PLL for power converters under unbalanced and distorted grid conditions

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Figure

Fig. 1  (a)Block diagram of the proposed PLL Structure, (b) Linearised control loop with the pre-filter
Fig. 3  Pole-zero maps with different parameters
Fig. 7  Results with fixed frequency: (from top to bottom) grid voltage, gridfrequency, fundamental positive-sequence d-axis voltage, fundamentalpositive sequence q-axis voltage, and the positive sequence phase angledetected by the proposed PLL

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