电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
3期
66-72
,共7页
刘远%王天真%汤天浩%李继方%陈嘉琦
劉遠%王天真%湯天浩%李繼方%陳嘉琦
류원%왕천진%탕천호%리계방%진가기
级联H-桥%多电平逆变%主元分析%支持矢量机%故障诊断
級聯H-橋%多電平逆變%主元分析%支持矢量機%故障診斷
급련H-교%다전평역변%주원분석%지지시량궤%고장진단
cascaded H-bridge%multilevel inverter%principal component analysis%support vector machine%fault diagnosis
多电平逆变系统由许多开关器件组成,具有非线性因素,很难建立数学模型来识别故障.针对多电平逆变系统故障的特点,为了实现级联 H-桥多电平逆变系统的故障诊断,提高诊断的精确度和运算速度,提出了一种基于 PCA-SVM 模型的故障诊断策略.分析了故障信号,采用快速傅里叶变换(FFT)实现对故障信号的预处理,主元分析(PCA)提取起主要作用的特征向量,降低噪声,减少训练和测试时间,通过SVM进行训练和测试.实验结果表明,该方法具有很好的故障诊断能力、整体的诊断精度高达98%、计算效率高,满足了级联H-桥多电平系统诊断故障要求.
多電平逆變繫統由許多開關器件組成,具有非線性因素,很難建立數學模型來識彆故障.針對多電平逆變繫統故障的特點,為瞭實現級聯 H-橋多電平逆變繫統的故障診斷,提高診斷的精確度和運算速度,提齣瞭一種基于 PCA-SVM 模型的故障診斷策略.分析瞭故障信號,採用快速傅裏葉變換(FFT)實現對故障信號的預處理,主元分析(PCA)提取起主要作用的特徵嚮量,降低譟聲,減少訓練和測試時間,通過SVM進行訓練和測試.實驗結果錶明,該方法具有很好的故障診斷能力、整體的診斷精度高達98%、計算效率高,滿足瞭級聯H-橋多電平繫統診斷故障要求.
다전평역변계통유허다개관기건조성,구유비선성인소,흔난건립수학모형래식별고장.침대다전평역변계통고장적특점,위료실현급련 H-교다전평역변계통적고장진단,제고진단적정학도화운산속도,제출료일충기우 PCA-SVM 모형적고장진단책략.분석료고장신호,채용쾌속부리협변환(FFT)실현대고장신호적예처리,주원분석(PCA)제취기주요작용적특정향량,강저조성,감소훈련화측시시간,통과SVM진행훈련화측시.실험결과표명,해방법구유흔호적고장진단능력、정체적진단정도고체98%、계산효솔고,만족료급련H-교다전평계통진단고장요구.
It is difficult to diagnose fault using a mathematical model because MLIS consists of many switch devices and their complexity has a nonlinear factor. For the characteristics of faults of MLIS, in order to realize the cascade H-bridge multilevel inverter system (MLIS) fault diagnosis and improve the accuracy of the fault diagnosis and operation speed, a fault diagnosis strategy based on the model of the PCA-SVM is proposed. This paper firstly analyzes the fault signal and uses the Fast Fourier transform (FFT) technology to realize the preprocessing of the fault signal. Then the main feature vectors are extracted to reduce the influence of the noise, and decrease the training and test time. Finally, it is trained and tested by the model of PCA-SVM. Experimental results show that the diagnosis method has a very good ability and efficiency, and the overall diagnosis accuracy is more than 98%. It meets the cascade H-bridge multilevel inverter system requirements.