基于VSS窗的改进相位差电力谐波分析方法

发布时间：2018-04-04 15:22

本文选题：相位差　切入点：衍生半正弦窗　出处：《电测与仪表》2014年22期

【摘要】：利用快速傅里叶变换(FFT)进行谐波分析时,在非同步采样和非整数周期截断条件下存在频谱泄露和栅栏效应,影响谐波的分析精度。采用传统的窗函数对信号进行加权,虽然可以减小频谱泄露和栅栏效应的影响,但其效果受到窗函数旁瓣特性的制约。提出一种基于衍生半正弦窗的改进相位差电力谐波分析方法。该方法引入一种新的窗——衍生半正弦窗,对信号进行加权,然后采用改进相位差算法分析谐波参数——幅值、频率、相位。衍生半正弦窗可以通过调整指数获得满足要求的旁瓣特性,能较好的抑制频谱泄露,在工程应用中具有很大的灵活性。推导了信号基波及各次谐波频率、幅度、初相位的求解公式。仿真实验结果表明,提出的基于衍生半正弦窗的改进相位差算法具有较高的计算精度。
[Abstract]:In harmonic analysis using Fast Fourier transform (FFT), there are spectral leakage and fence effect under the condition of asynchronous sampling and non-integer period truncation, which affect the accuracy of harmonic analysis.The traditional window function is used to weight the signal, although it can reduce the influence of spectrum leakage and fence effect, but its effect is restricted by the sidelobe characteristic of window function.An improved phase difference power harmonic analysis method based on derivative half sinusoidal window is proposed.In this method, a new window-derivative half-sinusoidal window is introduced to weight the signal, and then the improved phase difference algorithm is used to analyze the harmonic parameters-amplitude, frequency and phase.The derivative half-sinusoidal window can obtain the required sidelobe characteristic by adjusting the exponent, and it can restrain the spectrum leakage better, so it has great flexibility in engineering application.The formulas of the fundamental wave and the frequency, amplitude and initial phase of the signal are derived.The simulation results show that the improved phase difference algorithm based on derivative half-sinusoidal window has high accuracy.
【作者单位】：广东工业大学信息工程学院;广东工业大学机电工程学院;
【基金】：国家973计划项目(2011CB013100) 广东省自然科学基金(S2011040004079) 广东省教育部产学研结合项目(2012B091100424)
【分类号】：TM711

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