Power Flow Control in DC Microgrids Using an Integral Sliding Mode Control Approach

Abstract

This paper represents a strategy to control the voltage of DC bus and to ensure the active power flow of DC microgrids within the system alongside using an Integral Sliding Mode Control (ISMC) scheme. The fundamental elements of the DC microgrids are a Solar PV system, BESS, DC loads attached to the common DC bus directly or via DC-DC power converters. The solar PV system is connected through the DC-DC boost converter and BESS is linked with a DC-DC bidirectional converter to stabilize the power. So as to maintain the stable power flow of each component, the nonlinear ISMC scheme is employed for getting the corresponding control signal and the total stability of each unit is evaluated by means of the control Lyapunov theory. Finally, the proposed microgrid is simulated under different operative situations on a MATLAB/SIMULINK platform. The proposed controller scheme verifies the active power flow and the voltage consistency of the DC bus within the standard limits and the result is also assessed with a Conventional Sliding Mode Controller (CSMC).