Enhancing Voltage Stability and Optimizing Power Management in DC Microgrids Using Model Predictive Control Considering Various Load Types

Instability problems caused by constant power loads as a result of the negative impedance effect are dealt with in this article. A comprehensive nonlinear model of a single-bus DC microgrid is developed, and a model predictive controller is designed to enhance voltage stability and optimize power management based on the developed model. Conventional control layers are replaced by a simplified optimal controller in the proposed approach in the presence of various load types, including constant power loads. Furthermore, the model and control strategy are extended to the multi-bus DC microgrid. Extensive stability analysis, including root locus methods and time-domain simulation, has been conducted in MATLAB/SIMULINK. The results confirm the effectiveness of the designed controller in maintaining system stability and improving performance under different operating conditions.