Voltage Fluctuation Analysis in Power Systems
Summary
Voltage fluctuation analysis is concerned with the characterisation, measurement and mitigation of variations in power system voltage amplitude. Fluctuations arise from dynamic loads, renewable generation intermittency, switching operations and fault conditions. Short-duration voltage sags and swells, long-term voltage variations and fast transients all contribute to power quality issues that can impair equipment operation, reduce efficiency and trigger nuisance tripping. Quantitative assessment relies on time-domain and frequency-domain analysis, including root-mean-square detection, envelope extraction and spectral decomposition. Standards such as IEC 61000-4-30 define measurement protocols, while flickermeter methodologies quantify perceptible light modulation. Recent advances in smart metering and real-time monitoring leverage high-resolution sensors, distributed phasor measurements and machine learning to localise disturbance sources and predict events. Analytical models incorporate network impedance, source characteristics and load coherency, enabling simulation of propagation paths and severity indices. Mitigation strategies range from static VAR compensators and active filters to adaptive control of distributed energy resources. Global networks face rising challenges from widespread adoption of power-electronic converters, variable renewable infeed and increasingly sensitive electronic loads, underscoring the need for robust fluctuation analysis to ensure reliability, support grid integration and safeguard industrial and residential applications.
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Voltage Fluctuation Analysis in Power Systems publication trend
The graph below shows the total number of articles in voltage fluctuation analysis in power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Voltage fluctuation: Variation of the instantaneous voltage magnitude around its nominal value over time.
Voltage sag: Short-duration decrease in RMS voltage typically lasting from 0.5 cycles to a few seconds.
Voltage swell: Short-duration increase in RMS voltage that can stress insulation and electronic devices.
Flicker: Perceptible light modulation caused by rapid voltage fluctuations within the flicker frequency range.
Short-circuit impedance: Equivalent impedance at a grid point representing fault or disturbance propagation paths.
Empirical wavelet transform: Signal processing technique that decomposes non-stationary signals into adaptive wavelet components.
References
- Selective Identification and Localization of Voltage Fluctuation Sources in Power Grids. Energies (2021).
- Propagation of Voltage Fluctuations and Assessment of LED Lamps Light Flicker in Low Voltage Networks. IEEE Access (2023).
- Characteristics of voltage fluctuations induced by household devices and the impact on LED lamps. International Journal of Electrical Power & Energy Systems (2022).
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