Voltage Regulation of Boost Converter Operating under Constant Power Load using Model Predictive Control

In this study, the design of a Model Predictive Controller (MPC) is presented to regulate bus voltage and enhance the stability of a DC/DC boost converter in a DC microgrid operating under Constant Power Load (CPL). The primary objective of this study is to develop a nonlinear control technique capable of effectively stabilizing power converters in the presence of CPL, which has the potential to cause significant instability issues. When designing the proposed control approach, it is crucial to consider the nonlinear nature and negative impedance characteristics of CPL. The MPC controller aims to mitigate the instability problems caused by CPL directly connected to a DC/DC boost converter. The proposed controller design ensures that the output voltage follows the predefined reference value, regardless of whether the system operates in continuous or discontinuous current mode. To demonstrate the effectiveness of the designed controller, comparative simulation studies have been conducted. In these simulations, performed using MATLAB/Simulink, the obtained results confirm that the DC bus voltage remains stable at the desired reference value. Furthermore, comparative simulation results were obtained and evaluated to compare the performance of MPC with a conventional PI controller. The simulation results indicate that MPC achieves significantly better tracking of the reference DC bus voltage compared to the conventional PI controller.