Median LMS Control Approach for SPV Grid Integrated Distribution System

Abstract

In this paper, the MLMS (Median Least Mean Square) control approach is used for a grid coupled three phase SPV (Solar Photovoltaic) system for improvising the power quality. This three phase SPV grid coupled system consists of two converters as follows: (1) a voltage source converter (VSC) and, (2) a boost converter and loads at the point of common coupling (PCC). Here, the VSC is attached with a SPV array to the utility grid and it balances the grid currents. Moreover, it helps to remove the load current harmonics. Here, the MLMS control evaluates the weight component, which gives the high rate of convergence. In SPV system, the feed-forward term is used for giving the fast dynamic response. The solar PV array Peak is harvested using the P& O (Perturb & Observed) based MPPT technique. This MLMS control of a PV system is simulated at different real time scenario such as, load unbalance and solar insolation change. The grid current harmonics are reduced with in the limit of the IEEE-519 std, while feeding the load to the grid.