Many existing short-circuit calculation (SCC) methods may encounter the issue of divergence in solving distribution systems with distributed generators (DGs) and ZIP (constant power, constant current, and constant impedance) loads. To address this problem, this study presents a robust homotopy-enhanced numerical SCC method for general distribution networks with non-linear loads. Numerical studies reveal that the difference of SCC results between ZIP loads and constant impedance loads can be as large as 37.9% for the IEEE 8500-node test system, highlighting the importance of load modelling in calculating short-circuit currents. To demonstrate its robustness and effectiveness, the proposed method is evaluated on the IEEE 13-bus network and the IEEE 8500-node test system. The evaluation results are very promising. One distinguished feature of the proposed method is that it can assist several existing SSC methods to solve the short-circuit equations of distribution networks with DGs and ZIP loads.

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Homotopy-enhanced short-circuit calculation for general distribution networks with non-linear loads

References

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