Harmonic Resonance Analysis in Grid-Connected Power Systems
Summary
Harmonic resonance analysis in grid-connected power systems examines the dynamic interactions between power electronic converters, passive network elements and the wider electrical grid. As renewable energy sources and inverter-interfaced resources proliferate, the frequency-dependent impedances of converters and network branches may align to form resonant loops, amplifying distortion and risking system instability. Contemporary approaches employ impedance-based stability criteria, such as Nyquist-type methods, to predict resonance frequencies and assess damping margins. Advanced modelling techniques capture both low-order and high-order harmonic currents, while control-based damping schemes—ranging from virtual resistance emulation to adaptive filter tuning—serve to suppress adverse oscillations. A comprehensive analysis integrates nodal admittance matrices, equivalent circuit representations and real-time simulation to ensure robust operation under weak-grid conditions, fluctuating power injections and evolving grid codes. Practical applications span offshore wind farms, distribution-level microgrids and multi-inverter clusters, underscoring the global significance of maintaining power quality and system resilience in decarbonised energy networks.
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Harmonic Resonance Analysis in Grid-Connected Power Systems publication trend
The graph below shows the total number of articles in harmonic resonance analysis in grid-connected power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Harmonic Resonance: A condition in which nonlinear converter or network elements excite the power system at frequencies that coincide with its natural resonant modes, resulting in amplified voltage or current distortion.
Impedance: The frequency-dependent complex ratio of voltage to current at a network node or converter terminal, determining the magnitude and phase of harmonic interactions.
Admittance: The inverse of impedance, often used in nodal admittance matrices to represent the connectivity and resonance properties of an electrical network.
Point of Common Coupling (PCC): The physical interface where a generation source or converter connects to the utility grid, serving as the principal measurement point for power quality and resonance analysis.
Virtual Conductance: A control-based technique that emulates resistive damping at the PCC to attenuate resonant oscillations without adding additional passive components.
References
- Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System. Electronics (2023).
- Analysis and Mitigation of Harmonic Resonances in Multi–Parallel Grid–Connected Inverters: A Review. Energies (2022).
- Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster. Energies (2022).
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