开关磁阻电机系统故障诊断研究
发布时间：2018-09-18 07:20
【摘要】：本文主要对开关磁阻电机系统中常见的几类故障进行了研究。在对开关磁阻电机系统故障诊断技术的发展现状总结分析的基础上,阐述了开关磁阻电机的特殊性和故障诊断的必要性。详细分析了开关磁阻电机各类故障后系统电气量的变化趋势,给出了定子绕组匝间短路后故障相的电压、电流变化过程和功率变换器主开关器件短路或开路后不同拓扑结构下电流的励磁回路与续流回路。论文选用12/8结构三相电机和8/6结构四相电机为研究对象,选用不对称半桥型和公共开关型功率变换器,在Matlab中搭建了各种组合下的正常和故障模型,通过对故障后电流的分析,得出不同故障诊断方法。对于定子绕组匝间短路故障,本文利用相电流基波分量重构各相电流,以其负序分量和正序分量幅值比作为故障特征量。对于功率变换器主开关器件故障,本文通过对母线电流进行小波变换,提取小波变换系数最大值的平均值为故障特征量;通过对相电流进行积分,选取积分值作为故障特征量。最后,利用实验平台,测量各种工况下正常和故障时的电流数据,通过对数据进行分析,验证了定子绕组匝间短路故障诊断方法和功率变换器主开关器件故障诊断方法的正确性。
[Abstract]:In this paper, some common faults in switched reluctance motor system are studied. On the basis of summarizing and analyzing the development of fault diagnosis technology of switched reluctance motor system, the particularity of switched reluctance motor and the necessity of fault diagnosis are expounded. The change trend of system electrical quantity after various faults of switched reluctance motor is analyzed in detail, and the voltage of fault phase after inter-turn short circuit of stator winding is given. The current changing process and the current exciting circuit and the continuous current circuit of the main switch device of the power converter under different topologies after short circuit or open circuit. In this paper, the three-phase motor with 12 / 8 structure and the four-phase motor with 8 / 6 structure are selected as the research objects, and the asymmetrical half-bridge and common-switching power converters are selected. The normal and fault models under various combinations are built in Matlab, and the current after fault is analyzed. Different fault diagnosis methods are obtained. For the stator winding inter-turn short circuit fault, the phase current fundamental wave component is used to reconstruct each phase current, and the amplitude / value ratio of its negative sequence component and positive sequence component is used as the fault characteristic quantity. For the main switching device fault of power converter, the average value of the maximum wavelet transform coefficient is extracted as the fault eigenvalue by wavelet transform of the bus current, and the integral value is selected as the fault characteristic value by integrating the phase current. Finally, using the experimental platform, the current data under various working conditions are measured, and the data are analyzed. The correctness of the fault diagnosis method of stator winding inter-turn short circuit and main switching device of power converter is verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM352
本文编号：2247193
[Abstract]:In this paper, some common faults in switched reluctance motor system are studied. On the basis of summarizing and analyzing the development of fault diagnosis technology of switched reluctance motor system, the particularity of switched reluctance motor and the necessity of fault diagnosis are expounded. The change trend of system electrical quantity after various faults of switched reluctance motor is analyzed in detail, and the voltage of fault phase after inter-turn short circuit of stator winding is given. The current changing process and the current exciting circuit and the continuous current circuit of the main switch device of the power converter under different topologies after short circuit or open circuit. In this paper, the three-phase motor with 12 / 8 structure and the four-phase motor with 8 / 6 structure are selected as the research objects, and the asymmetrical half-bridge and common-switching power converters are selected. The normal and fault models under various combinations are built in Matlab, and the current after fault is analyzed. Different fault diagnosis methods are obtained. For the stator winding inter-turn short circuit fault, the phase current fundamental wave component is used to reconstruct each phase current, and the amplitude / value ratio of its negative sequence component and positive sequence component is used as the fault characteristic quantity. For the main switching device fault of power converter, the average value of the maximum wavelet transform coefficient is extracted as the fault eigenvalue by wavelet transform of the bus current, and the integral value is selected as the fault characteristic value by integrating the phase current. Finally, using the experimental platform, the current data under various working conditions are measured, and the data are analyzed. The correctness of the fault diagnosis method of stator winding inter-turn short circuit and main switching device of power converter is verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM352
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