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通过三调谐直流滤波器谐振频率对其元件参数的灵敏度分析,揭示了三调谐直流滤波器各元件参数变化对谐振频率的影响机理,以此为基础提出了一种基于粗糙集理论的三调谐直流滤波器失谐故障元件检测方法。该方法将滤波器元件参数微变引起的各次谐波电流相对变化量作为条件属性,参数微变元件类型作为决策属性,以此建立决策表,通过对决策表的属性约简导出造成滤波器失谐的故障元件检测规则,并讨论了确定性因子、覆盖度和置信度等检测规则的评价指标。通过对实际直流系统的大量仿真计算表明,该故障元件检测方法简单、有效。
Based on the analysis of the sensitivity of the resonant frequency of the three-tuned DC filter to its component parameters, the influence mechanism of the parameters of the three-tuned DC filter on the resonant frequency is revealed. Based on this, a three-tuned direct current Filter detuning fault detection components. In the method, the relative change of each harmonic current caused by the micro-change of the filter element parameters is taken as the condition attribute and the parameter micro-element type as the decision attribute, so as to establish the decision table. By means of the attribute reduction of the decision table, the filter Detuning fault detection rules components, and discussed the determinants, coverage and confidence and other detection rules evaluation index. Through a large number of actual DC system simulation shows that the fault detection method components simple and effective.