In this study, a hybrid model-based and data-driven method is proposed for the current sensor fault diagnosis used in single-phasepulsewidthmodulation (PWM) rectifier. According to the principle of model-based meth...
详细信息
In this study, a hybrid model-based and data-driven method is proposed for the current sensor fault diagnosis used in single-phasepulsewidthmodulation (PWM) rectifier. According to the principle of model-based methods, the proposed diagnostic method is based on signal prediction and residual generation. Differently, instead of a mathematical model, the signal prediction model is developed based on a data-driven method. Non-linear autoregressive exogenous learning model, randomised learning technique, and extreme learning machine are utilised to generate the data-driven prediction model. Once the fault is detected, fault-tolerant control is activated by substituting the predicted signal for the information of faulty sensors. The offline test shows that the proposed method is able to predict the sensor signal accurately with the root mean square error of 4.276 x 10(-5). In addition, hardware-in-the-loop tests are conducted to verify the feasibility and reliability of the proposed method in the real-time application.
On the basis of sampling theory, an online open-switch fault diagnosis and location method for single-phasepulse-widthmodulationrectifiers applied in electric railway traction is presented. First, on the basis of a...
详细信息
On the basis of sampling theory, an online open-switch fault diagnosis and location method for single-phasepulse-widthmodulationrectifiers applied in electric railway traction is presented. First, on the basis of analysing the features of the post-fault line current under instantaneous current control strategy at low switching frequency, two specific pulse sequences for sampling line current are generated via the modulation. Then, the DC component of the sampled signal, which is easy to use for diagnostic decision, is obtained through filters. Experimental results are presented to illustrate the validity of the proposed scheme.
暂无评论