A Computational Framework and Model Design Methodology for Short-Circuit Current Calculation in New Type Power Systems

The increasing integration of renewable energy sources is transforming conventional power systems into the new-type power systems characterized by high penetrations of power electronic converters. These changes challenge the applicability of traditional short-circuit current calculation methods, which are primarily based on synchronous generator models. To address the modeling complexity, computational inefficiency, and lack of compatibility with emerging standards, this paper proposes a novel computational framework and model system design methodology for short-circuit current calculation in large-scale, renewable-integrated power systems. The framework adopts a modular, object-oriented architecture with separate network and algorithmic layers. It supports various dynamic device models, facilitates fast data retrieval, and enables efficient parallel computation. Simulation tests based on full-scale nationwide power grid data from 2025 demonstrate that the proposed framework significantly improves computational efficiency compared with commercial software such as PSASP and PSD. The results confirm the framework's strong scalability, extensibility, and applicability for future-oriented short-circuit analysis in evolving power systems.