An Adaptive Dual-Loop Lyapunov-Based Control Scheme for a Single-Phase UPS Inverter

An Ellipse-Optimized Composite Backstepping Control Strategy for a Point-of-Load Inverter Under Load Disturbance in the Shipboard Power System

“…The load-current sensor is indispensable in [17]. Both [18] and the proposed approach are inherently dual-loop control schemes, that can rigorously guarantee the global large-signal stability of the system. The key for [18] design is based on an adaptive weighted Lyapunov function, whose design requires genuine expertise.…”

“…Both [18] and the proposed approach are inherently dual-loop control schemes, that can rigorously guarantee the global large-signal stability of the system. The key for [18] design is based on an adaptive weighted Lyapunov function, whose design requires genuine expertise. In comparison, the proposed approach selects the Lyapunov function step by step in a recursive manner using the backstepping approach, which is systematic.…”

“…One common obstacle of [17] and [18] is that the controller gains selection is indeed a trial-and-error process. Although the root-locus technique in [17], the eigenvalues of the Jacobian matrix in [18] may provide certain help for controller gains selection, it lacks explicit formulas to tune the controller gains. In comparison, the optimal controller gains in this paper are quantitatively calculated out, which is straightforward and time saving for practical implementation.…”

“…It also requires load-current sensors for practical implementation. Recently, adaptive control is reported in [18]. It inherently has dual control loops to achieve better steady-state and transient performance, which could also rigorously guarantee the largesignal stability unconditionally.…”

“…Besides, the controller gains selection guideline in [16]- [18] are just qualitatively illustrated without quantitative formulas. Currently, methods to optimize the controller gains in nonlinear control are still on the way.…”