Modelling and Small Signal Stability analysis of DC Microgrid

In this paper, the mathematical model of a DC-DC converter has been developed. Input to the converter has been considered as a constant DC voltage. The output of the converter is connected to a DC line via an LCL filter. Control circuitry for the converter has been designed to control the voltage, current, and power from the converter. The overall model is developed in the state-space. A single converter has six states and two inputs, and all the states are taken as output. Eigenvalue analysis has been carried out to study small signal stability analysis for the considered system. A pole-placement controller has also been designed to enhance the stability of the system.