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In this paper, the uncertainty and disturbance estimator (UDE)-based control is adopted for a class of nonlinear systems with mismatched uncertainties and input saturation. By integrating with the backstepping approach, the robustness for the mismatched uncertainties is guaranteed by the recursive structure of backstepping. The “disturbance-like” terms which consist of the unknown dynamics, disturbances...
Synchronverters are grid-friendly inverters that mimic the operation of conventional synchronous generators. In this paper, the non-linear stability of the synchronverter in the sense of boundedness is investigated and proven for the first time. To this end, initially, the complete non-linear model of the synchronverter is obtained and then the field-excitation current loop of the synchronverter is...
In this work, a non-linear controller with an inherent current-limiting property is proposed to achieve dc output voltage regulation and unity power factor operation for single-phase ac/dc converters. The proposed current-limiting non-linear controller (CLNC) acts independently from the system parameters and is proven to guarantee closed-loop system stability using non-linear control theory. Without...
In this paper, a bounded integral controller (BIC) is proposed for regulating non-linear systems with guaranteed closed-loop system stability. It is proven that the BIC generates a bounded control output independently from the plant parameters and states and guarantees closed-loop system stability in the sense of boundedness with the only knowledge of the input-to-state (practical) stability (ISpS)...
There is increasing interest in the control of communication networks. This paper reveals that a simple method, the dual-locus diagram method, is very effective in analyzing the robust stability of simple time-delay systems, which are often met in communication systems. As to a single connection studied in [15], the same results as those obtained by Niculescu have been obtained, but in a much simpler...
When paralleled inverters feed a common load, it is required that the load is shared according to their power ratings. In this paper, the robust droop controller (RDC) proposed in the literature for achieving accurate proportional power sharing for paralleled inverters is implemented in a way to ensure a bounded closed-loop performance. Using non-linear Lyapunov methods, it is shown that the controller...
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