Fixed-Time Observer Based Integral Sliding Mode Control Design for Microgrids Feeding Constant Power Loads

This work focuses on designing a controller for a DC microgrid that feeds constant power loads (CPLs). In a DC microgrid, constant power loads and associated negative incremental impedance cause non-linear behavior that affects damping and stability margins. Thus, a strong and effective control technique is needed to handle these issues. In this paper, an observer-based integral sliding mode controller is proposed to accurately predict the power flow through constant power load (CPLs). The proposed control scheme improves the DC microgrid performance and robustness to non-linearity and parameter fluctuations. Integral sliding mode control regulates the boost converter duty cycle using estimated parameters from observers. Lyapunov stability criteria maintain system stability. This control technique allows the dc bus to follow the desired reference voltage and power with precision and fast transient response. Simulation verification using MATLAB Simulink has been performed and the results confirm the methodology’s validity.