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- 2017
基于频谱特性的HVDC区内外故障快速识别
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Abstract:
高压直流输电（HVDC）系统区内外故障快速判别是实现故障保护的基础。由于直流滤波器、平波电抗器以及线路分布电容等作用下，区内外故障时，直流电流信号传播至保护安装处所经历的物理边界存在较大区别，导致直流电流频带能量分布具有明显差异。该文采用总体经验模态分解法（EEMD）对HVDC系统故障时的直流电流信号进行分解，将信号分解为几个固有模态分量（IMF）之和。然后，计算各模态分量的能量，通过对比分析，找出特征区别，进而定义能量比判据用于区分正常、区内、本侧区外以及对侧区外故障。该方法仅采用直流电流信号，简单易实现，能够满足快速性和选择性要求。最后，通过对HVDC多种工况下的大量故障进行仿真分析，验证了该方法的有效性和鲁棒性。
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