PLLs or Unit Vector Generators are used to find out grid voltage and angle accurately so that grid synchronisation can be done easily. they are also used in Park's transformations for controller implementations. PLL gives accurate result with varying voltage and frequency conditions also.
sagar kumar dash (2021). Phase Locked Loop (PLL) (https://www.mathworks.com/matlabcentral/fileexchange/63593-phase-locked-loop-pll), MATLAB Central File Exchange. Retrieved .
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