基于极电压误差标准化的五相逆变器开路故障诊断方法

发布时间：2018-12-31 15:10

【摘要】：多相电压源逆变器(voltage source inverter,VSI)广泛应用于低压大功率的电机驱动系统中,为了提高系统运行的可靠性,实现故障后无扰容错运行,其关键在于对功率变换器发生的故障进行实时有效的检测与识别。针对五相电压源逆变器单相桥臂功率管发生的开路故障,提出基于极电压误差标准化的故障诊断方法。该方法根据正常状态和故障发生后逆变器输出极电压间存在的偏差,通过分析和比较其产生原理和分布规律即可进行故障的诊断和定位。为了简化诊断算法,使其独立于直流母线电压,将极电压误差值执行标准化计算;采用将诊断变量与设定好的阀值相比较的方法,消除测量误差产生的影响;通过设置诊断变量的最小持续时间,避免了死区时间和开关延时引起的误诊断。实验结果验证了诊断算法的有效性和可靠性。
[Abstract]:Multi-phase Voltage Source Inverter (voltage source inverter,VSI) is widely used in low-voltage and high-power motor drive system. The key is to detect and identify the power converter faults in real time and effectively. A fault diagnosis method based on the standardization of pole-voltage error is proposed for the open-circuit fault of the single-phase bridge arm power tube of the five-phase voltage source inverter. According to the deviation between the output voltage of the inverter in normal state and after the fault occurred, the fault diagnosis and location can be carried out by analyzing and comparing the principle and distribution of the output voltage of the inverter. In order to simplify the diagnostic algorithm and make it independent of DC bus voltage, the pole voltage error value is standardized calculated, and the influence of measurement error is eliminated by comparing the diagnostic variable with the set threshold value. By setting the minimum duration of the diagnostic variable, the dead zone time and the fault diagnosis caused by the switch delay are avoided. Experimental results verify the effectiveness and reliability of the diagnostic algorithm.
【作者单位】：哈尔滨工业大学电气工程及自动化学院;
【基金】：国家自然科学基金项目(51177026)~~
【分类号】：TM464

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