Integrated Fault-detection and Control of DC Microgrids Using SDRE Observer-controller

In this paper, using the state-dependent Riccati equation (SDRE) technique, a suboptimal fault-tolerant control scheme is designed for a DC microgrid in the islanded mode. The objectives are the voltages control of the photo-voltaic cell, the battery, the capacitor bank, and the DC bus as well as on time fault detection. In the design procedure of the SDRE observer-controller, a nonlinear mathematical model is utilized to model the behavior of the microgrid in different working conditions. The performance of the microgrid is evaluated in the presence of uncertainties in its parameters and measurement noises. The obtained simulation results show that the proposed method is so effective in the fault detection, not detecting the disturbance instead of fault, and having a robust performance even in the presence of external disturbances.