DROOP BASED DC MICROGRID CONTROL BY STATE FEEDBACK LINEARIZATION

摘要

With the growing tendency towards the renewable energy generation, DC microgrids are becoming more popular in small scale power systems. Due to the low inertia and low spinning reserves in the DC microgrids, the control aspects are more challenging than in the traditional large scale power systems. Droop control is one of the popular load sharing method utilized in microgrids. Application of state feedback linearization to design a droop controller is presented in this paper. Boost DC-DC power converter is considered as the intermediate converter which injects or transform the power from a constant DC source to the power network. First the conventional dynamical system of the boost converter is transformed in to the feedback linearizable form which is called as the Brunovsky's canonical form. Then the controller is designed to regulate the inductor current and the output voltage of the boost converter to the desired values given by the droop relationships. Detail performance evaluation of the proposed controller is presented. Matlab simulation results are given considering a three generator and two load power system to illustrate the effectiveness and the applicability of the proposed concept.