【摘要】 综合离散余弦变换和小波变换模极大值原理在时频分析中的优点,提出了基于离散余弦变换和小波变换的电能质量扰动信号检测方法。先通过离散余弦变换检测出各种基频干扰(电压暂降、电压暂升和电压间断)和各次谐波(包括暂态谐波),再利用小波变换模极大值原理检测出暂态振荡和暂态脉冲,并实现扰动时间和扰动幅值的测定。该方法具备较强的抗噪能力,仿真结果验证了该方法的有效性。更多还原

【Abstract】 Synthesizing respective advantages of discrete cosine transform (DCT) and wavelet transform (WT) module maximum in time domain analysis, a DCT and WT based power quality disturbance signal detection method is proposed. In this method firstly the fundamental frequency disturbances, including voltage sag, voltage swell and voltage interruption, and the harmonics in different orders involving transient harmonics are detected, then transient oscillation and transient pulses are detected by use of WT module maximum, and the measurement of duration and amplitude of the disturbances are ascertained. The proposed method possesses better noise proof ability, and its effectiveness is verified by simulation.更多还原