基于线电压误差的永磁直驱风电系统变流器开路故障诊断

发布时间：2018-08-27 19:12

【摘要】：永磁直驱风电系统变流器的开路故障严重影响系统的运行特征。为了提高系统可靠性,要求能够及时检测到故障的发生,并能准确定位故障功率管。为此,提出了基于线电压误差的永磁直驱风电系统变流器开路故障诊断方法。该方法利用正常状态和故障情况下线电压的偏差进行故障诊断和定位,并且采用电压幅值和时间宽度的双重标准提高故障诊断的可靠性。首先,将线电压误差值与设定的阈值相比较;然后通过设置诊断变量的最小持续时间,来消除测量误差和外界环境的影响等引起的误判;最后,利用故障定位标志位判定故障功率管。仿真和实验结果验证了故障诊断方法的有效性和可靠性。
[Abstract]:The open circuit fault of the converter of the permanent magnet direct drive wind power system seriously affects the operation characteristics of the system. In order to improve the reliability of the system, it is necessary to detect the fault in time and locate the fault power tube accurately. This paper presents an open circuit fault diagnosis method for converter of permanent magnet direct drive wind power system based on linear voltage error. The fault diagnosis and location are carried out by using the deviation of line voltage in normal state and fault condition, and the double standard of voltage amplitude and time width is adopted to improve the reliability of fault diagnosis. First, the line voltage error is compared with the set threshold; then, by setting the minimum duration of the diagnostic variable, the error caused by the measurement error and the influence of the external environment is eliminated. Finally, Fault power tube is determined by fault location mark bit. Simulation and experimental results verify the effectiveness and reliability of the fault diagnosis method.
【作者单位】：安徽大学电气工程与自动化学院;东南大学电气工程学院;高节能电机及控制技术国家地方联合实验室(安徽大学);
【基金】：国家重点基础研究发展计划(973计划)(2013CB035603) 国家自然科学基金项目(51137001,51507002,51577025,51607001) 安徽省自然科学基金项目(1508085ME87,1708085QE108)~~
【分类号】：TM46;TM614

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