Control of DC Microgrid using Interconnection and Damping Assignment Passivity based control method

This paper proposes the use of Interconnection and Damping Assignment Passivity Based Control (IDA-PBC) technique to control the DC microgrid. The IDA-PBC method improves the damping of the system. It also ensures asymptotic stability of the system. It is achieved by making the system passive. The islanded DC microgrid design structure used in this study consists of a photovoltaic source, battery and a DC load connected to a DC bus. The main objective of this method is to derive a control law that will provide stability of the DC bus voltage. The control law is derived using IDA-PBC method and implemented in SIMULINK. In the simulated model, the irradiation is varied and the load is kept constant. The simulated response shows that despite the variation of irradiation, the bus voltage and the power drawn by the load remains constant. It also gives the optimum irradiation value for which the battery contribution is negligible. It can be used for efficient battery management and to increase the battery life.