Resilient Interconnected Power-Grid Control Using Sliding Mode Approach

The increasing integration of distributed energy resources (DERs) coupled with inverter-based resources (IBRs) and the reduction in traditional synchronous generation (SG) led to frequency deviation, oscillation, and grid instability. This paper focuses on developing a resilient interconnected power grid (RIPG) with high penetration of DERs-IBRs by integrating a robust frequency control (RFC) that ensures grid stability. The main objective of RFC is to reduce the frequency deviation and ensure that energy storage's power consumption remains within the preferred levels. The proposed controller has two interactive control loops: an outer loop that consists of a super twisting (STW) sliding mode-based control for the secondary control and an inner loop that consists of an integrated full-state feedback observer-based stabilizing controller (FFOSC) for the primary area. Asymptotic stability is studied by considering a new sliding surface. To illustrate our approach, a simulation of a RIPG was conducted using the MATLAB/Simulink platform, and the results confirmed the efficiency of the proposed controllers.