Hardware in the loop implementation of linearizing state feedback on MVDC ship systems and the significance of longitudinal parameters

In future all-electric ships, which rely on a Medium Voltage DC distribution network, the power system stability can be jeopardized by the presence of constant power loads, due to their negative incremental resistance. In fact, this causes stability problems due to the negative impedance characteristic of tightly regulated converters. The Linearizing State Feedback (LSF) has shown the capability to stabilize these systems. The key modelling assumption for this control is the possibility to neglect cable parameters. In this paper we implement the LSF control in an FPGA hardware and simulate the shipboard power system in RTDS to test the validity of the cable assumption in Hardware in the Loop (HiL) tests.