Democratic Current Sharing Controller for Modular Multi-Parallel Rectifiers (MMR)

This paper proposes a democratic current sharing controller for Modular Multi-parallel Rectifiers (MMR) system operating in Continuous Conduction Mode (CCM). A generalised small-signal AC model for n-number of parallel units is derived. Also, State-Space equations and transfer functions for the system are provided in this paper. A cascaded loops controller for the parallel units is utilised to ensure that the rectifiers' currents are balanced equally. A 60 kW system is modelled in MATLAB/Simulink to verify the proposed controller.