A comparative study of single phase grid connected phase looked loop algorithms

A phase-locked loop (pll) is a vital part of power inverters for achieving synchronization with the utility grid. throughout the phase angle of the grid voltage,a reference signal is generated in order to synchronize the operation condition of the renewable energy generation systems with the utility grid. the present paper presents a comparative study of the enhancement for conventional phase-locked loop using four different filters,including adaptive notch filter,second order adaptive notch filter,generalized integrator filter and second order generalized integrator filter. a comparison among these four studied improvements was conducted under normal operation condition. on the other hand,the performance of these filters was tested under two abnormal scenarios; voltage sag and phase jump. the results showed that the second order generalized integrator based pll has superior performance over the other filters based pll under both normal and fault operation conditions. in contrast,the adaptive notch based filter based pll has the lowest response under both operation conditions. © 2017 jordan journal of mechanical and industrial engineering.