Harmonic Distortion Analysis in Power Systems
Summary
Harmonic distortion arises when electrical waveforms deviate from their ideal sinusoidal shape, a phenomenon commonly introduced by non-linear devices such as power electronic converters, variable-speed drives and modern lighting. These distortions propagate through generation, transmission and distribution networks, degrading power quality and compromising system reliability. Analytical approaches combine frequency-domain models, which represent harmonic sources as equivalent current injections, with time-domain simulations that capture dynamic interactions among components. Harmonic load-flow techniques extend conventional power-flow studies by incorporating harmonic impedance matrices, enabling the prediction of voltage and current distortion levels at different network nodes. Measurement campaigns employ specialised meters to evaluate total harmonic distortion (THD) and individual harmonic orders, guiding the design of mitigating measures. Active and passive filters, adaptive controllers and distributed compensation units attenuate dominant harmonics, while power factor correction schemes minimise current distortion at source. Emerging strategies integrate demand-side management and real-time monitoring to balance economic operation with stringent power quality standards. As renewable generation, electric vehicle charging and distributed resources proliferate, the accurate analysis and mitigation of harmonics remain critical to safeguarding equipment, reducing losses and ensuring regulatory compliance on a global scale.
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Harmonic Distortion Analysis in Power Systems publication trend
The graph below shows the total number of articles in harmonic distortion analysis in power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Harmonic distortion: Deviation of a periodic waveform from its fundamental sinusoid due to superimposed integer-multiple frequencies.
Total Harmonic Distortion (THD): Ratio of the root-sum-square of all harmonic components to the magnitude of the fundamental frequency, expressed as a percentage.
Non-linear load: An electrical device whose current–voltage relationship is not proportional, causing waveform deformation and harmonic generation.
Harmonic load-flow: Extension of conventional power-flow analysis that accounts for voltage and current harmonics by including complex frequency-dependent impedances.
Power factor correction (PFC): Techniques or circuits designed to align current waveform with supply voltage, thereby reducing reactive power and current harmonics.
References
- Time-series quasi-dynamic load flow analysis with seasonal load variation to resolve energy nexus for a practical distribution network in Puducherry smart grid system incorporating harmonic analysis and mitigation. Energy Nexus (2023).
- State-of-the-Art Power Factor Correction: An Industry Perspective. Encyclopedia (2024).
- Power Quality Mitigation via Smart Demand-Side Management Based on a Genetic Algorithm. Energies (2022).
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