Abstract:
Use of Derivative based PLL is one of the simplest
and fastest solution for phase-locked loops in single phase
systems. The dynamics of Derivative-PLL are comparatively
better than other methods, but it exhibits high frequency noise
amplification and also under performs in non-ideal grid conditions. In this paper, a robust arbitrary order exact differentiator
is proposed as a solution to generate noise free, fast and
exact orthogonal signal by utilizing second order generalized
differentiator method which is used further to formulate a PLL
that is immune to high frequency noise and performs well under
various disturbances in voltage, frequency, phase, harmonics,
noise and DC-offset in grid voltage. The proposed PLL is modeled
using MATLAB/SIMULINK and is tested for standard grid
conditions. Typical results are reported and are compared with
existing PLLs. It is found that the proposed method is not only
simple and immune to noise and disturbances but also superior
compared to other PLLs.
