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基于信息熵的串联型故障电弧频谱特征研究

, PP. 488-495

Keywords: 串联型故障电弧,小波包,信息熵,短时傅立叶变换,频谱特征

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Abstract:

针对串联型故障电弧影响供配电系统供电安全的问题,提出小波包信息熵理论与短时傅立叶变换相结合的串联型故障电弧频谱特征分析方法.首先研制了低压串联型故障电弧实验平台,开展了典型负载故障电弧模拟实验.其次,利用小波包技术对发生稳定串联型故障电弧前后的电流信号进行分解,重构和归一化处理.然后,计算各频带重构信号的信息熵,通过对比各频段燃弧前后重构信号的信息熵得出稳定故障电弧电流信号的特征频段为8-10.8KHz.最后,采用短时傅立叶变换对特征频段的重构信号进行时频分析,得出发生稳定故障电弧前后电流信号的频谱变化规律.经验证,在发生不稳定故障电弧时,8-10.8KHz仍为故障电弧的特征频段,频谱特征依然明显.结果表明,利用信息熵和短时傅立叶变换对低压串联型故障电弧进行频谱特征研究是可行的.

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