Performance Analysis of Modified Leaky LMS Based Control Scheme for Single-Stage and Dual-Stage Three-Phase Grid-Tied PV System

Photovoltaic (PV) based distributed generation (DG) helps meeting continuously increasing power demand. Effective control of PV-based DG becomes crucial for its integration into the power network. This paper presents a Modified Leaky Least Mean Square (MLLMS) algorithm based control scheme for SSGPV and DSGPV three-phase grid-tied PV system. The DSGPV system consists of a PV array, a dc-dc boost converter controlled using Incremental Conductance (InC) technique for maximum power point tracking (MPPT) operation and three-phase DG for dc to ac conversion, which is integrated with the utility grid. In a SSGPV system, DG is controlled for MPPT operation as well as power exchange with the grid and load. The presented grid-tied DG employs MLLMS based control scheme to generate the reference grid currents. Simulation analysis of the given SSGPV and DSGPV DG performance is carried out using MATLAB. The PV based DG effectively exchanges power with the grid as well as feeds to the load. It balances grid currents even in case of unbalanced load condition. The transient response of the DG is analysed for irradiation change and load unbalanced condition. Simulation results depict satisfactory steady-state as well as transient response of grid-tied PV based DG.