CAJ | 학술논문

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。
통과삼조해직류려파기해진빈솔대기원건삼수적령민도분석,게시료삼조해직류려파기각원건삼수변화대해진빈솔적영향궤리,이차위기출제출료일충기우조조집이론적삼조해직류려파기실해고장원건검측방법。해방법장려파기원건삼수미변인기적각차해파전류상대변화량작위조건속성,삼수미변원건류형작위결책속성,이차건립결책표,통과대결책표적속성약간도출조성려파기실해적고장원건검측규칙,병토론료학정성인자、복개도화치신도등검측규칙적평개지표。통과대실제직류계통적대량방진계산표명,해고장원건검측방법간단、유효。
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.