CAJ | 학술논문

随着电网的发展和电压等级的提高,高压输电系统的线路保护装置抗雷电干扰能力,直接影响系统的安膊全稳定运行.为保证保护动作的选择性和及时性,准确及时地识别故障原因,避免误动,针对线路故障跳闸与雷击的相关性,采用扰动信号的小波能量谱特征,提出一种线路雷击与普通短路的模糊识别方法.各类暂态扰动的电流行波信号进行小波变换后,分解为不同频带上的重构信号,通过构造高频、中频、低频段三维特征向量,提取暂态扰动信号的特征.根据不同扰动特征向量变化规律及扰动的不确定性,利用模糊推理机,建立IF-THEN规则,对非故障性雷击、故障性雷击和普通短路进行快速识别.该方法符合人的直观判断经验,对故障相角、故障电阻、故障位置以及雷电流波形等影响因素具有良好的适应性,对某实际500 kV线路的仿真证明,该方法具有识别快速、准确的特点,能在保证保护装置的速动性的同时提高选择性.
수착전망적발전화전압등급적제고,고압수전계통적선로보호장치항뇌전간우능력,직접영향계통적안박전은정운행.위보증보호동작적선택성화급시성,준학급시지식별고장원인,피면오동,침대선로고장도갑여뢰격적상관성,채용우동신호적소파능량보특정,제출일충선로뢰격여보통단로적모호식별방법.각류잠태우동적전류행파신호진행소파변환후,분해위불동빈대상적중구신호,통과구조고빈、중빈、저빈단삼유특정향량,제취잠태우동신호적특정.근거불동우동특정향량변화규률급우동적불학정성,이용모호추리궤,건립IF-THEN규칙,대비고장성뢰격、고장성뢰격화보통단로진행쾌속식별.해방법부합인적직관판단경험,대고장상각、고장전조、고장위치이급뇌전류파형등영향인소구유량호적괄응성,대모실제500 kV선로적방진증명,해방법구유식별쾌속、준학적특점,능재보증보호장치적속동성적동시제고선택성.
In order to master the relativity between lightning and fault trip and to improve the non-faulty lightning resistance ability of ultra-high-speed protection, we put forward a fuzzy identification method between lightning strike and fault on transmission line on the basis of wavelet energy spectrum. First of all, wavelet transform was used to analyze the transient traveling wave signal, and the energy of different frequency bands of the signal was calculated so as to extract the wavelet spectrum. Then the three-dimensional energy eigenvector of high frequency band, middle frequency band and low frequency band was formed. Based on the inaccuracy of three-dimensional energy eigenvector of different transient signals, a fuzzy inference system of 10 fuzzy rules was established to distinguish among non-faulty lightning, faulty lightning and common fault. Simulation results show that the proposed method can adapt to the uncertainty of fault angle, transient resistance, waveform and amplitude of lightning current and so on. Also the proposed fuzzy inference system is in accordance with the intuitive judgment experience, so it is an applicable method to identify lightning strike and fault on transmission line, and the reliability of ultra-high-speed protection can be improved under the case of faster response speed of protection.