检索结果-南通市图书馆

short-circuit fault-tolerant control for five-phase fault-tolerant permanent magnet motors with trapezoidal back-EMF

在线全文

学校读者我要写书评

暂无评论

Fundamental Research 2022年第6期2卷 964-973页

作者： Qian Chen Yuhang Xia Jiabin Wang Wenxiang Zhao Guohai Liu School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China Department of Electronic and Electrical Engineering The University of SheffieldSheffield S13JDUK

When a short-circuit fault occurs in a phase,the faulty phase needs to be removed artificially from the system because of the loss of the capability to generate *** this case,both the short-circuit current and phase-loss fault would generate additional torque *** this study,a novel fault-tolerant control strategy is introduced to achieve low torque ripple operation of five-phase fault-tolerant permanent magnet synchronous motors with trapezoidal back electromotive force(FTPMSM-TEMF)in the event of a short-circuit *** key concept of this method is to compensate for the torque ripples caused by the short-circuit current and the adverse effect of the *** on the torque expression under fault conditions,the torque ripple caused by the short-circuit current can be offset by injecting a certain pulsating component into the torque expression in the phase-loss *** would result in smooth operation under fault ***,to track the fault-tolerant alternating currents,the model of the deadbeat current predictive control is extended and restructured for the fault *** effectiveness and feasibility of the proposed fault-tolerant strategy are verified by experimental results.

关键词： short-circuit fault Five-phase fault-tolerant permanent magnet synchronous motor Trapezoidal back electromotive force fault-tolerant Deadbeat current predictive control

Analysis of the harmful effects to buried oil pipeline from power line short-circuit fault

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 124-128页

作者： LU Ying-hua MO Fan School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Based on the transmission line theory of the buried metallic structures, the concerned harmful effects to the buried oil and natural gas pipelines caused by the power line short-circuit fault are further discussed. A closed-form expression of the induced voltage caused by the short-circuit fault of the ultra-high voltage power （UHVAC） transmission line is given. The transmission line model of the buried pipeline is set up and a set of formulas for calculating induced voltage on the pipeline and the parameters of the buried pipeline in actual environment condition are given. At last, the characteristic of the harm^hl effects on the buried pipeline from the power line short-circuit fault are discussed.

关键词： ultra-high voltage (UHV) power line short-circuit fault oil pipeline transmission line model of the buried metallic structures

fault Detection and Analysis of Distributed Power System short-circuit Using Wavelet Fractal Network

在线全文

学校读者我要写书评

暂无评论

Fault Detection and Analysis of Distributed Power System Sho...

Single-ended fault Detection Scheme Using Support Vector Machine for Multi-terminal Direct Current Systems Based on Modular Multilevel Converter

2007 8th International Conference on Electronic Measurement & Instruments（ICEMI’2007）

作者： Song Yuhai Wang Guangjian Chen Xiangguo Hebei University of Engineering Handan 056038 China

A novel method based on wavelet network and fractal theory for detecting short-circuit fault is proposed. To increase the signal-noise-ratio of the fault signal, the signal denoising technology using the statistic rule is brought forward to determine the threshold and the decomposition level of each order of wavelet space. On the basis of the inter relationship of wavelet transform and fractal theory, the whole and local fractal exponents obtained as features are presented for extracting fault signals. The effectiveness of the new algorithm used to extract the characteristic signal is described, which can be achieved by different fractal dimensions values of those types of short-circuit fault. In accordance with the threshold value of each type of short-circuit fault in each frequency band, the correlation between the type of short-circuit and the fractal dimensions can be figured to perform extraction. This detection model incorporates the advantages of morphological filter and multi-scale wavelet transform to extract the feature of faults meanwhile restraining various noises. The simulation results demonstrates that the proposed model is verified effectively.

关键词： Distributed power system fault detection short-circuit fault Signal denoising fractal theory wavelet transform

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 990-1000页

作者： Guangyang Zhou Xiahui Zhang Minxiao Han Shaahin Filizadeh Zhi Geng School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China Department of Electrical and Computer Engineering University of ManitobaWinnipegCanada

This paper proposes a single-ended fault detection scheme for long transmission lines using support vector machine(SVM)for multi-terminal direct current systems based on modular multilevel converter(MMC-MTDC).The scheme overcomes existing detection difficulties in the protection of long transmission lines resulting from high grounding resistance and attenuation,and also avoids the sophisticated process of threshold value *** high-frequency components in the measured voltage extracted by a wavelet transform and the amplitude of the zero-mode set of the positive-sequence voltage are the inputs to a trained *** output of the SVM determines the fault type.A model of a four-terminal DC power grid with overhead transmission lines is built in PSCAD/*** results of EMTDC confirm that the proposed scheme achieves 100%accuracy in detecting short-circuit faults with high resistance on long transmission *** proposed scheme eliminates mal-operation of DC circuit breakers when faced with power order changes or AC-side *** robustness and time delay are also assessed and shown to have no perceptible effect on the speed and accuracy of the detection scheme,thus ensuring its reliability and stability.

关键词： fault detection short-circuit fault multi-terminal direct current systems based on modular multilevel converter support vector machine(SVM) wavelet transform

Design and Optimization of Dual-Winding fault-Tolerant Permanent Magnet Motor

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2019年第1期3卷 45-53页

作者： Xuefeng Jiang Shaoshuai Wang Qiang Li Yufei Gao Nanjing University of Science and Technology. the M.S degree in School of Automation Nanjing University of Science and Technology Department of Electrical Engineering School of AutomationNanjing University of Science and Technology

To improve the performance of the traditional fault-tolerant permanent magnet(PM)motor,the design and optimal schemes of dual-winding fault-tolerant permanent magnet motor(DWFT-PMM)are proposed and *** order to obtain small cogging torque ripple and inhibiting the short-circuit current,the air gap surface shape of the PM and the anti short-circuits reactance parameters are designed and *** to the actual design requirements of an aircraft electrical actuation system,the parameters,finite element analysis and experimental verification of the DWFT-PMM after optimal design are *** research results show that the optimized DWFT-PMM owns the merits of strong magnetic isolation,physics isolation,inhibiting the short circuit current,small cogging torque ripple and high fault tolerance.

关键词： Dual-winding motor design and optimization fault-tolerance finite element analysis short-circuit fault