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Understanding Interharmonics: Key to Accurate Power Quality Analysis
This white paper explains the concept of interharmonics—frequency components at non-integer multiples of the line frequency—detailing their sources, measurement methods, and the IEC 61000-4-7 standard. It describes how interharmonic, harmonic groups, and subgroups are defined and used to effectively characterize and record power quality disturbances, especially as modern loads and inverter-based generation increase interharmonic presence in electrical systems.
Key topics include:
- Definition of Interharmonics
- Mechanisms Causing Interharmonics
- IEC 61000-4-7 Measurement Method
- Harmonic Groups
- Interharmonic Groups
- Harmonic Subgroups
- Interharmonic Subgroups
- Recording Interharmonics
Why utilities should care:
Accurate identification and aggregation of interharmonics enable more effective troubleshooting of power quality issues, optimize data recording strategies, and ensure compliance with standards as inverter-based resources and complex loads proliferate on the grid.
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