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Assessment of Voltage Sag Indices Based on Scaling and Wavelet Coefficient Energy Analysis

机译:基于标度和小波系数能量分析的电压暂降指标评估

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摘要

The two main voltage sag indices are magnitude and duration, defined in terms of the well-known rms voltages. The spectral energy of the voltages provides the same voltage sag indices of the rms voltage analysis and less computational effort is required. However, neither of them provide point on wave of sag initiation and recovery. This paper presents a wavelet-based methodology for the characterization of voltage sags, where the spectral energy of a voltage is decomposed in terms of the scaling and wavelet coefficient energies. The scaling coefficient energies of the phase voltages are used for voltage sag characterization, providing sag indices (magnitude and duration) in agreement with the definition. However, the analysis of the wavelet coefficient energies of such voltages provides additional information for the identification of the point on wave of voltage sag initiation and recovery as well as important parameters for power system protection and voltage sag mitigation devices. The performance of the proposed wavelet-based methodology was assessed with actual data and it was scarcely affected by the choice of the mother wavelet. Therefore, a compact mother wavelet can be used for voltage sag analysis with computational effort equivalent to the rms method and in agreement with practical applications. The maximal overlap discrete wavelet transform presented better performance than the discrete wavelet transform. All of the equations provided in this paper were developed for real-time analysis.
机译:两个主要的电压骤降指标是幅度和持续时间,分别根据众所周知的均方根电压来定义。电压的频谱能量提供与均方根电压分析相同的电压骤降指数,并且所需的计算工作更少。但是,它们都不能提供下垂引发和恢复的浪潮。本文提出了一种基于小波的电压骤降表征方法,其中电压的频谱能量根据比例和小波系数能量进行分解。相电压的比例系数能量用于电压骤降的表征,提供与定义一致的骤降指数(幅度和持续时间)。但是,对此类电压的小波系数能量的分析提供了附加信息,可用于识别电压骤降引发和恢复的波点,以及用于电力系统保护和电压骤降缓解装置的重要参数。所提出的基于小波的方法的性能是通过实际数据进行评估的,几乎不受母小波的选择的影响。因此,可以将紧凑的小波母波用于电压暂降分析,其计算工作量等效于均方根方法,并且与实际应用一致。最大重叠离散小波变换表现出比离散小波变换更好的性能。本文提供的所有方程式均已开发用于实时分析。

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