Harmonic Phasor Estimation Method Considering Dense Interharmonic Interference

Area of Science:

• Electrical Engineering
• Power Systems Analysis
• Signal Processing

Background:

• Harmonic and interharmonic components with close frequencies often overlap due to limited frequency resolution and signal windowing.
• Dense interharmonic (DI) components near harmonic spectrum peaks significantly reduce harmonic phasor estimation accuracy.

Purpose of the Study:

• To propose a novel harmonic phasor estimation method that effectively accounts for DI interference.
• To improve the accuracy of harmonic phasor estimation in the presence of significant interharmonic components.

Main Methods:

• Utilizing spectral characteristics (phase and amplitude) to detect DI interference.
• Establishing an autoregressive model based on signal autocorrelation for data extrapolation.
• Enhancing frequency resolution and mitigating interharmonic interference through data extrapolation.

Main Results:

• The proposed method accurately estimates harmonic phasor parameters even when DIs are present.
• Demonstrated capability in improving frequency resolution and eliminating interharmonic interference.
• Simulation and experimental results confirm the method's effectiveness and robustness.

Conclusions:

• The developed method provides accurate harmonic phasor estimation in the presence of DI interference.
• The technique exhibits good anti-noise capability and dynamic performance for power system monitoring.
• This approach enhances the reliability of power quality analysis in complex electrical environments.