Harmonic Analysis in Power Systems
Summary
Harmonics refer to sinusoidal disturbances at integer multiples of a system’s fundamental frequency, introduced by non-linear loads and power electronic converters that pervade contemporary power networks. The proliferation of renewable energy sources, variable-speed drives and advanced lighting systems has elevated the importance of harmonic analysis as a tool to safeguard voltage and current waveform integrity, minimise additional losses and ensure compliance with stringent grid codes. Through both frequency- and time-domain techniques—such as Fourier transform, empirical mode decomposition and state estimation—engineers characterise harmonic spectra, determine source contributions at the point of common coupling and model network impedance across multiple frequencies. Emerging computational approaches integrate artificial intelligence and optimisation algorithms to estimate harmonic impedance, enhance detection accuracy in unbalanced systems and support real-time monitoring. Practical applications span the design of passive and active filters, the development of compensation strategies in distribution networks and the integration of microgrids. The global significance of harmonic analysis lies in its role in maintaining power quality across interconnected systems, reducing equipment overheating, limiting electromagnetic interference and facilitating the seamless uptake of low-carbon technologies.
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Harmonic Analysis in Power Systems publication trend
The graph below shows the total number of articles in harmonic analysis in power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Harmonic: A sinusoidal component of a voltage or current waveform whose frequency is an integer multiple of the system’s fundamental frequency.
Total Harmonic Distortion (THD): A quantitative measure of harmonic content, defined as the ratio of the root sum square of all harmonic components to the fundamental component.
Point of Common Coupling (PCC): The node in a power system where multiple users or sources are connected, serving as the reference for power quality measurements.
Impedance: The frequency-dependent opposition that a circuit presents to the flow of alternating current, comprising resistance and reactance.
Photovoltaic (PV) Inverter: A power electronic device that converts direct current generated by solar panels into alternating current suitable for grid connection.
References
- Time domain harmonic state estimation in unbalanced power networks based on optimal number of meters and the principle of half‐wave symmetry. IET Generation Transmission & Distribution (2017).
- Harmonic Detection Technology for Power Grids Based on Adaptive Ensemble Empirical Mode Decomposition. IEEE Access (2021).
- Study on Harmonic Impedance Estimation and Harmonic Contribution Evaluation Index. IEEE Access (2020).
- Harmonic Distortion Prediction Model of a Grid-Tie Photovoltaic Inverter Using an Artificial Neural Network. Energies (2019).
- Harmonic Loss Analysis of Low-Voltage Distribution Network Integrated with Distributed Photovoltaic. Sustainability (2023).
- Modeling and open source implementation of balanced and unbalanced harmonic analysis in radial distribution networks. Electric Power Systems Research (2022).
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