*5.1. Test System Configurations*

To validate the proposed SOCP model for voltage stability calculations in DC networks, we consider the testing feeders reported in [11]. The first DC network corresponds to the high-voltage DC (HVDC) network, and the second network is an MVDC radial network. The topologies of the test feeders are illustrated in Figure 4. All the numerical information related to load consumption and branch parameters can be obtained from [11].

(**b**) 69-node test feeder

**Figure 4.** Electrical configuration of the test systems.
