MRZA-LMM with IMTOGI Control for Grid Tied PV System

This paper deals with a power quality improvement through MRZA-LMM (Modified Reweighted Zero-Attracting Least Mean M-estimate) with IMTOGI (Improved Mixed Third-Order Generalized Integrator) based control algorithm for a grid tied PV (Photovoltaic) system. The proposed control technique is used to control the PV panel power and to deliver the good quality at the utility distribution grid. The proposed control strategy is divided into two parts (1) extraction of fundamental weight component from the distorted load current and (2) extracting the unit template from the unbalanced and distorted grid voltage. The first objective is achieved through proposed MRZA-LMM control. It has fast convergence speed with low steady state errors. The prime objective of the control is met by the IMTOGI technique to estimate the balanced and sinusoidal grid synchronizing signals. This good quality of grid synchronizing signals are helpful to connect the AC/DC converter to the grid and injects the solar DC power into the main grid. The proposed control algorithm is through experimental results at steady state and transient conditions.