CAJ | 학술논문

为了对电压暂降问题进行监测和分析，采用USB2831数据采集卡和LabVIEW虚拟仪器开发平台设计了一套电压暂降检测与分析软件。 USB2831数据采集卡用于获取电压电流信号，在LabVIEW环境下用短时傅里叶变换作为时频信号的检测和分析工具，生成基波幅值曲线和最大频谱幅值曲线，以确定电压暂降深度、暂降的起止时刻以及各次谐波分量的幅值。将其检测结果与有效值算法的检测结果对比可知，短时傅里叶变换算法检测电压暂降的精度高，扰动定位能力强。所设计软件具有界面友好、扩展性强、使用方便等优点。
위료대전압잠강문제진행감측화분석，채용USB2831수거채집잡화LabVIEW허의의기개발평태설계료일투전압잠강검측여분석연건。 USB2831수거채집잡용우획취전압전류신호，재LabVIEW배경하용단시부리협변환작위시빈신호적검측화분석공구，생성기파폭치곡선화최대빈보폭치곡선，이학정전압잠강심도、잠강적기지시각이급각차해파분량적폭치。장기검측결과여유효치산법적검측결과대비가지，단시부리협변환산법검측전압잠강적정도고，우동정위능력강。소설계연건구유계면우호、확전성강、사용방편등우점。
In order to monitor and analyze voltage sag , this paper proposed the design of a voltage sag detection and a-nalysis software based on the USB 2831 data acquisition card and the LabVIEW virtual instrument development plat-form.The USB2831 data acquisition card was used to obtain voltage and current signals , and short time Fourier trans-form (STFT) was applied to detect and analyze time-domain signals in the LabVIEW environment .The curve of fun-damental frequency amplitudes and the curve of maximum spectral amplitudes were generated to determine the depth of the voltage sag , the starting and ending time of the voltage sag and the amplitude of each subharmonic component . In comparison with the results of the RMS algorithm , the STFT algorithm proved to have higher accuracy and stronger disturbance positioning capability in the voltage sag detection .The software designed also had advantages of user -friendly interface , strong expansibility and ease of use .