A Piecewise Linearization Based Method for Crossed Frequency Admittance Matrix Model Calculation of Harmonic Sources.

Area of Science:

• Electrical Engineering
• Power Systems Analysis
• Harmonics and Power Quality

Background:

• Large-scale power electronic equipment integration exacerbates power system harmonic issues.
• Existing harmonic models lack accuracy and detail in mechanism and complexity.
• Accurate harmonic modeling is crucial for mitigation and evaluation.

Purpose of the Study:

• To propose an accurate analytical model for phase-controlled power electronic harmonic sources.
• To address deficiencies in existing harmonic modeling techniques.
• To improve the accuracy and simplify the construction of harmonic models.

Main Methods:

• Developed a crossed frequency admittance matrix (CFAM) analytical model using piecewise linearization.
• Established unified harmonic models for single-phase and three-phase bridge rectifiers under intermittent and continuous load conditions.
• Validated the model through Matlab/Simulink simulations and experimental case studies.

Main Results:

• The proposed piecewise linearization CFAM model significantly improves harmonic modeling accuracy.
• The method simplifies the analytical model construction process.
• Demonstrated higher accuracy and stable performance in harmonic current estimation compared to traditional models.

Conclusions:

• The novel CFAM analytical model offers a more accurate and stable approach to modeling power electronic harmonic sources.
• This method effectively addresses limitations of previous harmonic modeling techniques.
• The findings contribute to better power quality management in systems with extensive power electronics.