基于粗糙集的三调谐直流滤波器失谐故障元件检测方法

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。

A Rough-set Based Detection Method for Detuning Components in a Triple-tuned DC Filter

The sensitivity analysis reveals the influence of triple-tuned DC filter component parameters on its resonant frequency.Based on that finding,a detuning detection method for triple-tuned DC filter is proposed according to the rough-set theory.In this method,a decision-making table is established,the relative change of harmonic current flowing through DC filter caused by various parameters is condition attribute,and the component type is decision attribute.Detection rules of fault component from the established decision-making table are derived.Finally,the rules of evaluation on the fault location,like the certainty factor,coverage and confidence are discussed.A large number of simulation on the actual DC system shows that the fault locating method is simple and effective.