FINITE-TIME COMMAND FILTERED BACKSTEPPING CONTROL DESIGN FOR POWER SYSTEMS WITH SUPERCONDUCTING MAGNETIC ENERGY STORAGE SYSTEM

This paper develops a finite-time command filtered backstepping control stra- tegy for power systems, including superconducting magnetic energy storage for transient stability enhancement and voltage regulation. Based on this technique, the presented con- trol strategy is used to stabilize the closed-loop system and avoid the problem of “explo- sion of terms” arising in conventional backstepping design. Despite a large disturbance, it enhances transient stability and maintains the terminal SMES voltage close to the de- sired reference voltage. Based on the Lyapunov direct method, the closed-loop stability is proved to ensure that the equilibrium point is finite-time and transiently stable, and all signals of the closed-loop system are bounded. The developed strategy’s effectiveness and feasibility are verified on a single-machine infinite bus power system with SMES. The simulation results demonstrate the proposed strategy which can improve transient per- formances, decrease rapidly the oscillations, and outperform a conventional command filtered backstepping design and a backstepping approach along with avoiding the problem of backstepping complexity explosion.