A Novel Two-stage Hybrid Anti-Islanding Protection Scheme and Non-Detection Zones Analysis of Inverter-Based Generations

Emerging challenges in anti-islanding protection systems have arisen due to increased load diversity and the widespread adoption of Inverter-Based Generation (IBG) within the electrical power distribution system. The scientific literature must comprehensively analyze diverse load models and their impact on islanding detection techniques. To address this, the research presented in this paper develops a novel two-stage hybrid anti-islanding protection strategy based on total harmonic distortion (THD) and absolute frequency deviation. Further, a detailed analysis of different load models, including emerging EV charging loads and their impact on non-detection zones, has been presented. The numerous islanding and non-islanding test cases have been simulated to evaluate the performance of the proposed method. The experimental validation of the proposed approach was carried out using Typhoon-Hardware-in-loop (Typhoon-HIL) and a real-time digital simulator (RTDS) based test setup. The proposed methodology operates quickly and can identify an islanding event in less than 120 ms.