摘要
提出了用连续小波变换CWT(ContinuousWaveletTransform)实现对短时电能质量SDPQD(ShortDurationPowerQualityDisturbances)检测与分类的新方法。该方法弥补了离散小波难以对谐波精确检测的缺点,通过计算小波系数的能量分布曲线,有效地区分出谐波(可以同时存在多种,包括分数次谐波)、暂态振荡、暂态脉冲、电压凹陷、电压凸起及电压间断等各种扰动,并能实现扰动的各项指标测定。在测定电压扰动幅度方面,提出了使用基于小波变换系数的电压扰动幅度确定法则。仿真结果表明,该方法对电能质量各种扰动分类有效,特别是对谐波检测及电压扰动幅度定位准确、快速,是一种综合性强、实用性好的检测方法。
A CWT(Continuous Wavelet Transform) - based method for measuring and classifying SDPQD(Short Duration Power Quality Disturbances)is introduced.By counting the energy distribution curve of CWT coefficient,it effectively classifies(where there can be many kinds or non - integer),transient oscillation,transient interruption,voltage sag,voltage swell and voltage interruption,which cannot be classified accurately by DWT because of harmonic.And it can detect all the indexes of power quality.The CWT coefficient - based law is introduced for detecting voltage disturbance range.Simulation results show that the proposed method is effective in the classification of SDPQD,especially in the detection of harmonics and voltage disturbance range.It is an inclusive and useful method.
出处
《电力自动化设备》
EI
CSCD
北大核心
2004年第3期17-21,共5页
Electric Power Automation Equipment
