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基于气动装置神经网络模型的anti-windup控制器设计 被引量:1
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作者 宋强 刘芳 任伟 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2006年第S1期157-159,共3页
为提高气动系统的控制效果,以Levenberg-Marquardt算法训练多层前馈神经网络,建立了一气动装置的神经网络模型并推导出ARX模型.基于气动装置的ARX模型,采用Ragazzini方法设计了anti-windup控制器.实时控制结果表明,所设计的控制器有效... 为提高气动系统的控制效果,以Levenberg-Marquardt算法训练多层前馈神经网络,建立了一气动装置的神经网络模型并推导出ARX模型.基于气动装置的ARX模型,采用Ragazzini方法设计了anti-windup控制器.实时控制结果表明,所设计的控制器有效地克服了控制死区和阀的饱和效应,实现了对该气动装置快速和高精度的控制. 展开更多
关键词 气动装置 ANTI-WINDUP 神经网络 LEVENBERG-MARQUARDT算法 Ragazzini方法
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A new ensemble-based classifier for IGBT open-circuit fault diagnosis in three-phase PWM converter 被引量:11
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作者 Yang Xia Bin Gou Yan Xu 《Protection and Control of Modern Power Systems》 2018年第1期373-381,共9页
Three-phase pulse width modulation converters using insulated gate bipolar transistors(IGBTs)have been widely used in industrial application.However,faults in IGBTs can severely affect the operation and safety of the ... Three-phase pulse width modulation converters using insulated gate bipolar transistors(IGBTs)have been widely used in industrial application.However,faults in IGBTs can severely affect the operation and safety of the power electronics equipment and loads.For ensuring system reliability,it is necessary to accurately detect IGBT faults accurately as soon as their occurrences.This paper proposes a diagnosis method based on data-driven theory.A novel randomized learning technology,namely extreme learning machine(ELM)is adopted into historical data learning.Ensemble classifier structure is used to improve diagnostic accuracy.Finally,time window is defined to illustrate the relevance between diagnostic accuracy and data sampling time.By this mean,an appropriate time window is achieved to guarantee a high accuracy with relatively short decision time.Compared to other traditional methods,ELM has a better classification performance.Simulation tests validate the proposed ELM ensemble diagnostic performance. 展开更多
关键词 IGBT open-circuit fault Extreme learning machine(ELM) Data-driven method Ensemble structure
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Modified sliding mode observer for wide speed range operation of brushless DC motor
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作者 A. DEENADAYALAN Chintala DHANANJAI G. SARAVANA ILANGO 《Frontiers of Electrical and Electronic Engineering in China》 CSCD 2012年第4期467-476,共10页
This paper describes an adaptive gain sliding mode observer for brushless DC motor for large variations in speed. Sensorless brushless DC motor based on sliding mode observer exhibits multiple zero crossing in back el... This paper describes an adaptive gain sliding mode observer for brushless DC motor for large variations in speed. Sensorless brushless DC motor based on sliding mode observer exhibits multiple zero crossing in back electromotive force (EMF) which leads to commutation problems at low speed. In this paper, a modified sliding mode observer incorporating a speed component in the estimation of back EMF is proposed. It is found that after incorporating the speed component in the back EMF observer gain, multiple zero crossings at low speeds and phase shift at higher speeds are eliminated. The trapezoidal back EMF observer is implemented experimentally on a digital signal processor (DSP) board. The effectiveness of the proposed method is demonstrated through simulations and experiments. 展开更多
关键词 brushless DC (BLDC) back electromotiveforce (EMF) sliding mode observer
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