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To satisfy the real-time and accuracy requirements of voltage sag detection, an interactive Dynamic Voltage Restorer (DVR) combined generalized S-transform and RMS is proposed. Generalized S-transform is improved by time-frequency aggregation performance criteria, to obtain high time-frequency resolution, realizing the detection and localization of mutation signal. The generalized inverse S-transform...
This work presents an comparison of some methods for voltage events detection. This evaluation is part of a wider study, which aims to develop a power quality monitor. Performance of evaluated methods is analyzed under demanding conditions, where the input signals present frequency variations, harmonic content and events of different magnitude, duration and initial phase. The conclusions of this analysis...
The effects of integration intervals on recursive rms and powers measurement in the presence of non-sinusoidal conditions are considered. The presence of time measurement intervals of both fixed and variable duration is assumed. Suitable formulas to evaluate the errors introduced by the desynchronization of measurement interval for active and apparent power, power factor and voltage and current rms...
This paper considers Discrete Wavelet Transform (DWT) for the detection of power quality disturbances. Wavelet Function Biorthogonal 3.9 is used as a base function due to its frequency response and information time localization properties. A methodology is proposed in order to choose the wavelet function that holds the best characteristics. Disturbances considered are low frequency disturbances such...
This paper proposes three strategies in order to obtain patterns that allow identification of power quality disturbances. These strategies use Discrete Wavelet Transform (using biorthogonal Wavelet) and RMS value. Disturbances under survey are: low frequency disturbances (such as flicker and harmonics) and high frequency disturbances (such as transient and sags). Due to time-frequency localization...
The paper presents a comparative study of the most commonly used methods of detection and analysis of voltage events in power systems. The performance of the rms method, the fundamental component estimation using discrete Fourier transform and Kalman filtering and the use of wavelet analysis for detection and estimation of magnitude and duration of voltage events, are studied under simulation using...
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