Adaptive Based Leaky LMS Control Technique of Grid Connected SPV System

Abstract

This paper presents the leaky LMS (LLMS) control for a double stage grid integrated SPV (solar photovoltaic) system. The SPV system comprises the boost converter, voltage source converter (VSC), a ripple filter, and nonlinear loads. The LLMS control has two objectives as follows (1) estimation of fundamental load current components and (2) evaluation of synchronizing signals, which is coupled at POI (point of interconnection). Moreover, this LLMS control algorithm eliminates the load side current harmonics, which improves the power quality. The control algorithm shows many advantages like as (1) it gives a quick response and convergence rate is very fast, (2) harmonics elimination as the capability to cancel the noise, and (3) simple in implementation. The boost converter is connected with the solar PV array and DC capacitor of VSC. Moreover, the boost converter extracts the peak power from the SPV array. The P&O (perturb & observed) based MPPT controller tracks the maximum power from photovoltaic array. Moreover, this solar P&O algorithm has good potential for rapidly solar variation perturbation. The SPV system with LLMS based control algorithm is simulated in MATLAB under PV variation irradiance and unbalanced load conditions. The total harmonics distortion (THDs) of the grid current is achieved as per in IEEE 519 standard.