A Proportional Resonant Power Controller and A Combined Amplitude Adaptive Notch Filter with PLL for Better Power Control and Synchronization of Single Phase On Grid Solar Photovoltaic System

In this paper, a modified hybrid synchronization technique to improve the synchronization process and one power control and management scheme during normal and abnormal condition of a single-phase grid connected solar photovoltaic (SPGCSPV) system have been proposed. Generally, ZCD (Zero Crossing Detection) and second-order generalized integrator (SOGI) based phase-locked loops (PLLs) are widely used for grid synchronization in SPGC inverter. However, adaptive notch filter (ANF) based algorithm is also gaining attention due to its simplicity and accuracy. In this work, to improve the synchronization technique with reduced steady state phase error, reduced allowable lock range and improved synchronization speed, an amplitude adaptive notch filter (AANF) is used with combining PLL with it, to implement a new AANF-PLL with control in d-q (direct-quadrature) frame. It gives very good response with the voltage and frequency variation. Further, modified technique can also be used in the detection of signal amplitude, harmonics, frequency, and control of power. The simulation study of the SPGCSPV system has been done using MATLAB/SIMULINK environment followed by hardware implementation for performance monitoring, anti-islanding, and low voltage ride through (LVRT) capability testing.