Symmetry-analysis-based diagnosis method with correlation coefficients for open-circuit fault in inverter
Symmetry-analysis-based diagnosis method with correlation coefficients for open-circuit fault in inverter
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DOI：
10.1049/el.2015.2415
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发表时间：
2015-10
影响因子：
1.1
通讯作者：
Feng Wu;Jin Zhao;Yang Liu
中科院分区：
文献类型：
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作者：
Feng Wu;Jin Zhao;Yang Liu
针对电压型逆变器的开路故障，提出了一种基于电流的带相关系数的实时快速对称性分析诊断方法。该方法包括数据重构、特征提取、故障检测和隔离三个步骤。为了达到较好的健壮性、实时性和快速性，设计了一个周期电流采样长度的滑动窗口进行数据重构。设计了两相电流的相关系数来描述逆变器在健康和故障状态下的对称性，并利用一段时间内电流样本的平均值来准确地隔离故障开关。该方法基于电流共享电流调节器所使用的电流传感器，因此成本较低。实验结果验证了该方法的有效性和优越性。
A current-based, real-time and fast symmetry-analysis-based diagnosis method with a correlation coefficient for an open-circuit fault in a voltage-source inverter is proposed. The proposed method includes three steps: data reconstruction, features extraction, fault detection and isolation. To achieve fair robustness, real-time and fast performance, sliding windows with length of a period current samples are designed for data reconstruction. Correlation coefficients of each of the two phase currents are designed to describe the symmetry of the inverter both in a healthy and a faulty condition, and mean values of current samples during a period are used to accurately isolate the faulty switch or switches. The proposed method is current-based sharing the current sensors that are used for the current regulators, hence it is low-cost. The high effectiveness and merit of the proposed method are validated by experiments.