How do you analyze and mitigate harmonics in electrical systems?

Harmonic analysis uses Fourier decomposition to identify frequency components. Measurement tools include power quality analyzers and spectrum analysis. Key metrics are THD (total harmonic distortion) and individual harmonic magnitudes per IEEE 519. Mitigation strategies include: passive filters tuned to specific harmonics, active harmonic filters, K-rated transformers, phase-shifting transformers, 12/18-pulse rectifiers, and PWM drives. Filter design must avoid resonance with system capacitance.