Port - Hamiltonian Modelling and Control of Single Phase DAB Based MVDC Shipboard Power System

Abstract

This paper presents a Port-Hamiltonian based modelling and control approach for MVDC Shipboard Power Systems (SPSs). The Line Regulating Converters (LRCs) consist of parallel-connected submodules based on the single-phase Dual Active Bridge (DAB) topology. The load side converters (Point of Load (POL) converters) are tightly regulated buck converters, which exhibit Constant Power Load (CPL) behavior with destabilizing effect on the MVDC bus voltage. We apply here an Interconnection and Damping Assignment Passivity Based Control (IDA-PBC) strategy to the MVDC SPS and evaluate its performance by simulation in MATLAB Simulink. The analyzed scenarios consider large disturbances such as load step up, submodule disconnection and LRC module disconnection. Furthermore, we prove that the entire MVDC is Port-Hamiltonian and therefore the system stability is guaranteed by the IDA - PBC.