Design of an Adaptive Estimator-Based Sliding Mode Controller With an Initial Voltage Error-Independent Reaching Time for Voltage Control of a DC Microgrid With Constant Power Loads

Abstract

DC microgrids face major operational challenges because constant power loads maintain their power consumption at fixed levels. The network experiences its main distortion source from these elements, which produce oscillations and lead to system breakdown through their negative incremental impedance effects. The authors of this study present a fast-SMC system that regulates DC microgrid voltage levels while operating with constant power loads. The system enables fast bus reference voltage tracking, together with better tracking performance and reduced system oscillations. To achieve these capabilities, a new reaching law is introduced that is independent of initial conditions and provides fixed-time convergence. It also helps reduce chattering by reducing the sign function coefficient. In addition, a new adaptive estimator is presented that is able to calculate the network power instantaneously and makes the control law robust to power variations. The research team conducted experimental testing to assess how well the control system performed. The research findings reveal that the recommended scheme achieves better results than all other tested methods.