Double-power reaching law sliding mode control for spacecraft decline based on radial basis function networks

Wang, Taihua; Zhao, Mi; Li, Yuanchun; Liu, Keping

doi:10.1109/ccdc.2017.7979456

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The (5) implies that the state is insensitive to changes in system parameters and external loading interferences during sliding mode action (sliding phase). Nevertheless, when the state trajectory is forced towards the sliding surface (reaching phase), the fast limited-time convergence and robustness is not always guaranteed; Gao and Hung first proposed a new concept of sliding-mode reaching law to solve this dilemma [76], and many researchers have improved classic slidingmode reaching law for various applications [77][78][79][80][81].…”

Section: Proposed Control Strategymentioning

confidence: 99%

Robust Optimal Tracking Control of a Full-Bridge DC-AC Converter

Chang

Cheng

2021

Applied Sciences

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This paper develops a full-bridge DC-AC converter, which uses a robust optimal tracking control strategy to procure a high-quality sine output waveshape even in the presence of unpredictable intermissions. The proposed strategy brings out the advantages of non-singular fast convergent terminal attractor (NFCTA) and chaos particle swarm optimization (CPSO). Compared with a typical TA, the NFCTA affords fast convergence within a limited time to the steady-state situation, and keeps away from the possibility of singularity through its sliding surface design. It is worth noting that once the NFCTA-controlled DC-AC converter encounters drastic changes in internal parameters or the influence of external non-linear loads, the trembling with low-control precision will occur and the aggravation of transient and steady-state performance yields. Although the traditional PSO algorithm has the characteristics of simple implementation and fast convergence, the search process lacks diversity and converges prematurely. So, it is impossible to deviate from the local extreme value, resulting in poor solution quality or search stagnation. Thereby, an improved version of traditional PSO called CPSO is used to discover global optimal NFCTA parameters, which can preclude precocious convergence to local solutions, mitigating the tremor as well as enhancing DC-AC converter performance. By using the proposed stable closed-loop full-bridge DC-AC converter with a hybrid strategy integrating NFCTA and CPSO, low total harmonic distortion (THD) output-voltage and fast dynamic load response are generated under nonlinear rectifier-type load situations and during sudden load changes, respectively. Simulation results are done by the Matlab/Simulink environment, and experimental results of a digital signal processor (DSP) controlled full-bridge DC-AC converter prototype confirm the usefulness of the proposed strategy.

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Section: Proposed Control Strategymentioning

confidence: 99%

Robust Optimal Tracking Control of a Full-Bridge DC-AC Converter

Chang

Cheng

2021

Applied Sciences

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“…Based on these methods, several other deep investigations on reaching law have been produced over the years. Wang [30] used a double-power reaching law to further enhance the efficiency of the power reaching law and decline the chattering issue, and an improved double-power reaching law was proposed by Tao [31]. Fallaha [32] introduced the exponential reaching law, which can increase the convergence speed and reduce oscillation.…”

Section: Introductionmentioning

confidence: 99%

Finite-Time Fault-Tolerant Control for a Stewart Platform Using Sliding Mode Control With Improved Reaching Law

2022

IEEE Access

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In this paper, a fault-tolerant control (FTC) is proposed for a nonlinear system as a Stewart platform (SP). To reject the singularity issue of a traditional fast terminal sliding mode control (FTSMC) and to have a fast finite-time convergence, a nonsingular fast terminal sliding mode control (NFTSMC) is used. In addition, an extended state observer (ESO) is applied for the control scheme to estimate uncertainties, disturbances, and faults. To increase the convergence speed and alleviate the chattering phenomenon, a novel reaching law is proposed which gives the system a quick reaching speed. Finally, a novel FTC that ensures robustness to disturbances and faults is developed based on the NFTSMC, the ESO, and the proposed reaching law. Consequently, the proposed FTC has outstanding features such as high tracking performance, a decrease of the effects of disturbances and faults, a fast convergence speed in finite time, and less chattering. The simulation and experiment results demonstrate the efficiency of the proposed FTC compared to other control schemes.INDEX TERMS Fault tolerant control, Sliding mode control, Reaching law, Extended state observer, Stewart platform.

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