Fault analysis addressing the combined influence of high penetration of DFIG, SCIG, PMSG wind farms, and PV farms in power grid integration

This study investigates the integrated impact of high penetration renewable energy sources specifically photovoltaic (PV) farms and wind turbine generators (WTGs) based on Doubly-Fed Induction Generators (DFIG), Squirrel Cage Induction Generators (SCIG), and Permanent Magnet Synchronous Generators (PMSG) on power grid performance under both normal and fault conditions. A hybrid renewable energy system architecture is developed and simulated using MATLAB/Simulink to analyze its dynamic behavior, fault ride-through capability, reactive power demand, and harmonic distortion. The methodology includes detailed modeling of PV arrays, WTGs, and associated power electronic converters, enabling the assessment of system performance during symmetrical (LLLG) and asymmetrical (LG) faults. Results reveal that while DFIGs and PMSGs deliver efficient active power generation, SCIGs exhibit higher reactive power consumption and lower dynamic stability. The study also evaluates total harmonic distortion (THD) and short-circuit ratio (SCR) for each generator type, showing that PMSGs achieve the lowest THD and maintain operational resilience under weak grid conditions (low SCR). These findings offer practical guidance for enhancing grid compliance, stability, and performance in future multi-source renewable energy systems.