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标题：内燃机车变流器接地保护策略研究 |
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作者：吴志友，张广远，姜涛，等 |
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| 2019年第4期 访问次数：310次 |
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摘要：通过对内燃机车主电路接地发生时的电路拓扑进行分析，采用一种简化的硬件设计用于接地检测。通过软件滤波，对检测的接地电压信号进行预处理，消除因开关器件动作所造成的共模干扰，同时保留接地电压波形的故障信息。再基于FFT在线分析接地电压的交、直流分量，通过交、直流分量的幅值，实时估算出对地阻抗值，并能判断出接地发生点的位置。
关键词：内燃机车；变流器；接地检测
Abstract: The circuit topology of the main circuit of diesel locomotive was analyzed, and a simplified hardware design was used to detect the grounding. Through software filter, the grounding voltage signal detected was preprocessed to eliminate the common-mode interference caused by the switching device operation, while keeping the fault voltage of the ground voltage waveform. Then the online analysis of the AC and DC components of the grounding voltage was carried out online based on the FFT. The impedance value of the grounding was estimated in real time through the amplitude of the AC and DC components, and the position of the grounding point can be judged.
Key words: diesel locomotive; converter; grounding detection
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