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This paper presents a novel approach for economic power flow in multi-terminal AC-DC systems. Unlike the similar AC-DC power flow studies, real equivalent circuit for the under load tap changer transformers (ULTCs) of the DC converters are considered in the AC-DC power flow algorithm. So the study provides real accurate results for practical AC-DC applications. Economic power flow solution for minimum generation cost is provided by Genetic Algorithm (GA). The proposed approach is tested on the modified IEEE 14-bus AC-DC test system. The results show that the proposed approach is efficient to reach the global optimum point of minimum generation cost without getting stuck to local minima while satisfying system constraints.

A Novel Economic Power Flow Solution in Practical Multi-terminal AC-DC Systems using Genetic Algorithm