Improved Adaptive Backstepping Approach on STATCOM Controller of Nonlinear Power Systems

Abstract

This paper proposes an improved backstepping control approach which uses errorcompensation and the sliding mode variable structure control to achieve stability for a single machine infinite bus system (SMIBS) with a static synchronous compensator (STATCOM). An adaptive sliding mode control was also utilised to obtain strong response performance in order to avoid excitation and the unknown parameters generated by the recursive steps of traditional backstepping control. Increasing the error-compensation term was used to generate a new virtual control to guarantee that the system states are more rapid stable and eliminate system chattering effectively generated by traditional sliding mode control. The boundedness and convergence of the closed-loop system were then obtained based on Lyapunov stability theory. Finally, a simulation is demonstrated to illustrate the effectiveness and the practicality of the proposed control method.INDEX TERMS Error compensation, adaptive sliding mode variable structure control, single machine infinite bus system, static synchronous compensator.

Design of a Damping Controller Using the SCA Optimization Technique for the Improvement of Small Signal Stability of a Single Machine Connected to an Infinite Bus System

“…The PSS-SCA system had the shortest damping time, approximately 1.8 s, and the smallest oscillation rate and damping performance of the SMIB system compared with those of the other approaches. PSS-MFO and PSS-EP followed with damping before 1.9 s and then PSS-U with damping before 5 s. The PSS-EP system required the fewest iterations (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) to converge on the minimum value objective function compared with those needed by the other approaches. The PSS-SCA and PSS-MFO systems required 75-150 iterations to converge on the solutions.…”

“…The coordination control design for the thyristor-controlled series capacitor (TCSC), SVC, and PSS [14,15] and of the PSS and series capacitive reactance compensator (SCRC) were used to enhance damping [16]. Furthermore, STATCOM has been coordinated with PSS-STATCOM and a unified power flow controller (UPFC), and UPFC has been coordinated with a PSS [17][18][19][20].…”