Modeling and Control of VIENNA Circuit Employed Single-Phase Single-Stage Solar PV System

This paper presents modeling and control of a VIENNA circuit employed in a single phase single-stage solar photovoltaic system (SPSSPVS). The topology for the proposed system consists of a half bridge voltage source converter (HBVSC), VIENNA circuit with unidirectional controlled switch and noise absorption (L-RC) filter. The proposed topology of the SPSSPVS offers to minimize the leakage current flow between PV panel to the utility grid and minimizes the component count. Inside this article, modeling and control of proposed SPSSPVS are described. The control of the system ensures the maximum photovoltaic power harvesting (MPPH) and synchronization with the utility grid. The MPPH operation is obtained using perturb and observe (P&O), however for the synchronization of HBVSC a modified third order sinusoidal integrator (mTOSSI) based band pass filter (BPF) is developed. The mTOSSI extracts the synchronization signal even if grid voltage is polluted. The performance is evaluated using the MATLAB 2022a platform.