Robust Control Technique of Grid Synchronization of SPV based BES System for Power Quality Improvement

Abstract

In this paper, a double stage seamless AOGLMS (Averaged Overdetermined Generalized LMS) control technique is used for a solar PV (Photovoltaic) based distributed generated system (DGS), in standalone mode (SM), and the grid-connected (GC) mode with multifunctional capability. This DG system has BDDC (Bidirectional DC-DC converter) with a battery, solar PV array generation, voltage source converter (VSC), and nonlinear/linear loads. The SPV battery system is capable to store the extra power of solar generation into the grid. Moreover, it has dual capability for performing both operations in GC mode and SM mode. Here, the MPPT based on P&O (Perturb and Observe) technique is used to harvest the peak power from the SPV array. In GC mode, the solar array is tied to the DC-link with a boost converter, and BDDC is used for maintaining the DC-link voltage with transferring the active power. Moreover, in GC mode, the robust control technique provides a seamless operation with eradicating the harmonics at different loading conditions. However, in the synchronization mode, the load voltage angle, and the grid voltage angle are obtained through the PLL (Phase Locked Loop).