Abstract
This paper presents the implementation of an adaptive phase locked loop (EPLL) technique for grid synchronization of single phase distributed generation system(DGS) using a low cost microcontroller. The adaptive PLL consists of a quadrature signal generator(QSG) based on a second order generalized integrator(SOGI) , Parks transform, low pass filter(LF) and frequency phase shift generator(FPG). The QSG- SOGI works as an adaptive notch filter and used for cancellation of harmonic components in the grid voltage. The QSG-SOGI and Parks Transform system is used for enhancing the performance of conventional multiplier based phase detector (PD). The required information about amplitude and phase of grid voltage is extracted from the vd and vq component of PD output. The objective of this paper is to implement the EPLL using a low cost microcontroller for accurate estimation the grid parameters like phase, frequency and voltage amplitude. The experimental results of implementation are discussed in the paper.
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