Hybrid AC/DC Static Transmission Expansion Planning Using a New Efficient Iterated Greedy Algorithm

In recent years, High Voltage Direct Current (HVDC) transmission has become a technically and economically feasible technology, to the point that HVDC networks integrated with AC systems are being developed. However, only a few research works address Transmission Network Expansion Planning (TNEP) considering both AC and DC networks. To develop an AC/DC TNEP approach, precise models that describe the behavior of the transmission lines and their associated converter stations in DC are required. This article proposes a formulation based on a non-convex model and a heuristic optimization method to solve the AC/DC TNEP. The implementation is based on Julia using the Garver AC/DC 6-bus, the IEEE 14-bus AC/DC, and IEEE AC 24-bus test systems.