Under the background of the first shipboard application of the medium voltage direct current (DC) integrated power system, the technical principles and characteristics of several high-power medium voltage DC test loads that were successfully developed in China recently are studied aiming at the mooring test load requirements of the large-capacity marine medium voltage DC power station. The performance of these test loads is then summarized and compared. Finally, suggestion of designing an energy-feedback combined load system is proposed together with the actual application conditions of the test loads in the shipyard mooring test and the development of the marine test loads. The test load function can be achieved while reasonably utilizing the energy generated during the power station test, in order to provide a preliminary scheme of the load system. It can provide theoretical references for the selection and application of the subsequent large-capacity medium voltage DC power station test load.

In order to achieve the local automatic twin-engine parallel operation of the main engine of a ship, an innovative solution is adopted to add a local “remote control station”- local twin-engine parallel control box- into the standard architecture of the imported main engine remote control system (RCS), and to move the core control unit of the system from the centralized control platform to the control box, aiming at the difficulty of modifying the standardized equipment of imported propulsion monitoring device. The implementation of the local automatic twin-engine parallel operation is described in views of the system architecture modification, control box function design, human-machine interface (HMI) design and ship application. This scheme also ensures that the local engine room still has partial automatic control and back-up control function of the main engine remote control system in the event of the failure of other remote control stations.