Modeling, Analysis and Control of Current Source Converter

Current source rectifier (CSR) tends to be attractive in industrial applications where a voltage step down function is required. It is used in different industrial applications such as: uninterruptible power supply (UPS), front-end rectifier for data center power supply, on-board charger of electric vehicle, motor drive application, electrolyzer application etc. In this paper, an average model based on the current reference vectors is proposed: it allows to determine quickly the dynamics because it doesn't require the space vector modulation part, and is weakly dependent of the topology. This model allows to set up a control strategy using two loops. The internal loop with high bandwidth will be based on flatness properties which allows to naturally damps the grid current oscillations without active damping methods. The external loop based on an energy balance will be discussed. A stability analysis will be presented. Finally, simulation and experimental results will verify the effectiveness of the proposed solution.