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An open-circuit fault Diagnosis Method for PMSM Drives Using Symmetrical and DC Components

Chinese Journal of Electrical Engineering 2021年第3期7卷 124-135页

作者： Wentao Huang Jiachen Du Wei Hua Qigao Fan School of Internet of Things Engineering Jiangnan UniversityWuxi 214122China School of Electrical Engineering Southeast UniversityNanjing 201196China

In this paper,a diagnostic method based on symmetrical and DC components is presented for multiple open-circuit faults(OCFs)in a three-phase permanent magnet synchronous motor drive.The remaining phase currents under faulty situations are theoretically analyzed based on the Fourier series method and the mechanism of torque generation.To evaluate the asymmetry and discriminate fault types,the magnitude ratio of the positive sequence to the negative sequence of phase currents is designed as a fault detection index.Thereafter,the DC components of the phase currents in different reference frames are utilized to locate faults.Specifically,the polarities of the DC contents in the natural reference frame are utilized to locate a single OCF and two OCFs in different legs.Two OCFs in the same leg are diagnosed by evaluating the signs of the phase currents in the dq reference frame with a negative rotating direction.The simulated and experimental results validate the effectiveness of the developed method in fault detection and robustness against operating point and motor parameter variations.

关键词： Permanent magnet synchronous motor open-circuit fault fault diagnosis symmetrical component

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open-circuit fault-tolerant Control Strategy Based on Five-level Power Converter for SRM System

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CES Transactions on Electrical Machines and Systems 2019年第2期3卷 178-186页

作者： Mingyao Ma Kexiang Yuan Qingqing Yang Shuying Yang School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

Switched reluctance motor power converters are prone to open-circuit faults because it need to withstand large voltages and currents.Due to the small number of traditional asymmetrical half bridge topology switches,it is difficult to carry out fault tolerant control when power converters has an open-circuit fault,resulting in larger output torque ripple.This paper presents a five-level power converter based on the traditional asymmetric half-bridge power converter.The five-level topology has more switching states and can work in multi-level mode.Based on the topology,different excitation and demagnetization voltages can be choose at different speeds.A fault-tolerance strategy is developed to decrease the influence of the open-circuit fault.The five-level power converter has four switches per phase,and two of them will be used in one of the operating mode.So the remaining two of the switches can be used for safe backup,enabling fault-tolerant control when an open-circuit occur.Since each phase of the five-level power converter proposed in this paper is independent of each other,a reasonable control strategy can be used to avoid the unbalance of the midpoint potential.Finally,the topology and fault-tolerant strategy proposed in this paper are verified by simulation and experiment.

关键词： fault tolerance control Midpoint potential open-circuit fault Power converter Torque ripple.

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open-circuit faults Diagnosis in Direct-Drive PMSG Wind Turbine Converter

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Energy Engineering 2021年第5期118卷 1515-1535页

作者： Wei Zhang Qihui Ling Qiancheng Zhao Hushu Wu Engineering Research Center of Hunan Province for the Mining and Utilization of Wind Turbines Operation Data Hunan University of Science and TechnologyXiangtan411201China School of Mechanical Engineering Hunan University of Science and TechnologyXiangtan411201China XEMC Wind Power Co. Ltd.Xiangtan411201China

The condition monitoring and fault diagnosis have been identified as the key to achieving higher availabilities of wind turbines.Numerous studies show that the open-circuit fault is a significant contributor to the failures of wind turbine converter.However,the multiple faults combinations and the influence of wind speed changes abruptly,grid voltage sags and noise interference have brought great challenges to fault diagnosis.Accordingly,concerning the open-circuit fault of converters in direct-driven PMSG wind turbine,a diagnostic method for multiple open-circuit faults is proposed in this paper,which is divided into two tasks:The first one is the fault detection and the second one is the fault localization.The detection method is based on the relative current residuals after exponential transformation and on an adaptive threshold,and the localization method is based on the average values of fault phase currents.The scheduled diagnosis method is available to both the generator-side converter and the grid-side converter,allowing to detect and locate single and double open-circuit faults.For validating this,robustness test and multiple open-circuit faults diagnosis are presented in a 2-MW direct-driven PMSG wind turbine system,the results validate the reliability and effectiveness of the proposed method.

关键词： Wind turbine converter open-circuit fault fault diagnosis exponential transformation

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