A unique active anti-islanding protection for a quasi-Z-Source based Power Conditioning System

This paper presents the performance assessment of three active Islanding Detection Methods (IDMs) for a quasi-Z-Source (qZS) based Power Conditioning System (PCS). The proposed PCS consists of a three-cell Cascaded H-Bridge (CHB) inverter where each module is fed by a qZS network. The proposed combined controller achieves grid-tie current injection, DC-link voltage balance for all qZS-CHB inverter modules, and anti-islanding protection. The anti-islanding protection performance is evaluated for three phase-shift based active Islanding Detection Methods (IDMs), namely Active Frequency Drift (AFD), Slide-Mode Frequency Shift (SMS), and Sandia Frequency Shift (SFS). Simulation results and real-time implementation using dS1103 board are carried out to validate the proposed design.