CAJ | 학술논문

以风力发电系统中背靠背式双脉冲宽度调制(pulse width modulation，PWM)变流器中整流状态为例，分析了绝缘栅双极型晶体管(insulated gate bipolar transistor，IGBT)各类开路故障状态下三相 PWM 整流器直流侧的输出电压信号，提出了基于小波包分析的变流器故障识别方法。该方法利用直流侧输出电压信号的调制特点，从能量谱和功率谱的角度分析了小波包分解后的直流侧输出电压的细节信号，通过频谱特征识别出三相PWM整流器的各类故障。仿真结果验证了该方法的有效性。
이풍력발전계통중배고배식쌍맥충관도조제(pulse width modulation，PWM)변류기중정류상태위례，분석료절연책쌍겁형정체관(insulated gate bipolar transistor，IGBT)각류개로고장상태하삼상 PWM 정류기직류측적수출전압신호，제출료기우소파포분석적변류기고장식별방법。해방법이용직류측수출전압신호적조제특점，종능량보화공솔보적각도분석료소파포분해후적직류측수출전압적세절신호，통과빈보특정식별출삼상PWM정류기적각류고장。방진결과험증료해방법적유효성。
Taking the working state of the rectifier in the back-to-back pulse width modulation (PWM) converter of wind power generation system for example, output voltage signals at the DC side of three-phase PWM rectifier under various types of open-circuit faults of IGBT are analyzed, and a wavelet packet analysis based method to identify rectifier faults is proposed. Using the modulation features of output voltage signals at the DC side, the details of output voltage signal at the DC side decomposed by wavelet packet are analyzed from the viewpoint of energy spectrum and power spectrum, thus various types of faults occurred in three-phase PWM rectifier can be identified by distinguishing the features of frequency-spectrum. The effectiveness of the proposed method is verified by simulation results.