Comparison of Methods for Determining Inception and Recovery Points of Voltage Variation Events

• Published in: 2018 IEEE Power & Energy Society General Meeting (PESGM) pp. 1 - 5
• Main Authors: Bastos, Alvaro Furlani, Santoso, Surya, Todeschini, Grazia
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-08-2018
• Subjects: Discrete wavelet transforms; Estimation; fault; inception point; Power quality; recovery point; Threshold voltage; Transient analysis; Voltage fluctuations; Voltage measurement; voltage sag; voltage swell
• ISSN: 1944-9933
• DOI: 10.1109/PESGM.2018.8585977

Voltage sags and swells occur often in power systems; however, determining the duration of these events is not straightforward. Seven methods for estimating the inception and recovery points (and consequently, the duration) of voltage sags and swells are surveyed: threshold rms voltage, waveform envelope, discrete wavelet transform, missing voltage, dq transformation, numerical matrix, and peak detector. Each method has its own strengths and weaknesses; however, no one method works on all conditions. An algorithmic approach to determining inception and recovery points is suggested. Such approach employs one method in combination with other methods based on the event characteristics.