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| 1 | Open-circuit Fault Diagnosis of Traction Inverter Based on Compressed Sensing Theory显示文摘This study proposes a new method of fault diagnosis based on the least squares support vector machine with gradient information(G-LS-SVM)to solve the insulated-gate bipolar transistor(IGBT)open-circuit failure problem of the traction inverter in a catenary power supply system.First,a simulation model based on traction inverter topology is built,and various voltage fault signal waveforms are simulated based on the IGBT inverter open-circuit fault classification.Second,compressive sensing theory is used to sparsely represent the voltage fault signal and make it a fault signal.The new method has a high degree of sparseness and builds an overcomplete dictionary model containing the feature vectors of voltage fault signals based on a double sparse dictionary model to match the sparse signal characteristics.Finally,the space vector transform is used to represent the three-phase voltage scalar in the traction inverter as a composite quantity to reduce the redundancy of the fault signals and data-processing capabilities.A G-LS-SVM fault diagnosis model is then built to diagnose and identify the voltage fault signal feature vector in an overcomplete dictionary.The simulation results show that the accuracy of this method for various types of IGBT tube fault diagnosis is over 98.92%.Moreover,the G-LS-SVM model is robust and not affected by Gaussian white noise. | Yongqi Cheng Weiguang Dong Fengyang Gao Guoqing Xin | 2020 | Chinese Journal of Electrical Engineering2020，6，1： | 6 |
| 2 | 共中线开绕组电驱动拓扑共模电压抑制策略显示文摘中线的引入使得双逆变器开绕组驱动拓扑同时兼顾了共母线和独立母线开绕组拓扑的优势,成为新能源汽车电驱动拓扑的理想形式。共模电压不仅造成轴电流影响电机的有效使用寿命,且其漏电流产生电磁干扰。依据开绕组拓扑在逆变器配置上的灵活性,将一台逆变器作为主逆变器,工作于六脉波模式,而将另一台逆变器作为辅助逆变器工作在高频脉宽调制模式。混合工作模式使得仅需在高频调制侧设置共模滤波器便可达到抑制漏电流和电磁干扰的目的。本文以异步电机为例,在讨论其控制策略的基础上,设计了共模滤波器,并通过基于Plexim RT-BOX实时仿真平台建立了对象模型,通过基于DSP的控制算法实现平台对所设计的控制算法和共模滤波器的有效性进行了验证。 | 杨淑英 孙光淼 符焕 谢震 | 2020 | 电工电能新技术2020，39，12： | 1 |
| 3 | Adaptive Neuro Fuzzy Inference System Based Decoupled Control for Neutral Point Clamped Multi Level Inverter Fed Induction Motor Dri显示文摘The presence of an integrator in a reference model of a rotor flux-based model reference adaptive system(RF-MRAS)and non-linearity of the inverter in the output voltage degrade the speed response of the sensorless operation of the electric drive system in terms of DC drift,initial value issues,and inaccurate voltage acquisition.To improve the speed response,a compensating voltage component is supplemented by an amending integrator.The compensating voltage is a coalition of drift and offset voltages,and reduces DC drift and initial value issues.During low-speed operation,inaccurate voltage acquisition distorts the stator voltage critically,and it becomes considerable when the stator voltage of the machine is low.Implementing a three-level neutral point clamped inverter in speed-sensorless decoupled control of an induction motor improves the performance of the drive with superior quality of inverter output voltage.Further,the performance of the induction motor drive is improved by replacing the proportional-integral(PI)controller in the adaption mechanism of RF-MRAS with an adaptive neuro-fuzzy inference system(ANFIS)controller.A prototype model of the three-level neutral point clamped inverter(3L-NPC)-fed induction motor drive is fabricated in a laboratory,and its performance for a RF-MRAS,modified RFMRAS,and modified RFMRAS using ANFIS are compared using different benchmark tests. | Giribabu Dyanamina Sanjay Kumar Kakodia | 2021 | Chinese Journal of Electrical Engineering2021，7，2： | 0 |
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