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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 2015

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Deliberations about three-phase PLL technologies applied to a grid control of the renewable power system

Liu L., Liu C.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2015

Vol. 63, nr 1

261--267

An efficient phase locked loop (PLL) method is very important to improve the grid-connected efficiency and the locked speed of frequency, phase, and voltage. However, most of literatures only introduce one PLL or one modified PLL method. There are many grid faults due to the grid connection to the renewable power generating system. A comparison and analysis is very important to select the most effective PLL technology for the grid-connected control of the renewable power system. Three PLL technologies are compared at different grid faults, such as single phase voltage drop, two phase voltage drop, frequency deviation, and voltage distortion. Simulation results indicated that different PLL methods have different locked performances at different grid faults.