Harmonic Resonance Risk Assessment Workbook (IEEE 519-2022 Aligned)

Harmonic resonance poses a critical stability and reliability threat in modern grids increasingly populated by inverter-based resources (IBRs), whose nonlinear switching behavior injects harmonic currents that may excite resonant modes in the system’s natural impedance characteristics. The workbook operationalizes IEEE 519-2022’s updated harmonic limits and planning guidelines—particularly Sections 4 (System Planning), 5 (Measurement and Analysis), and Annex B (Resonance Assessment)—by embedding standardized calculation workflows for impedance modeling (R-L-C network approximations), frequency sweep analysis (1–50th harmonics), and Q-factor–based resonance severity classification. It employs a tiered assessment methodology: first identifying candidate resonance frequencies via eigenvalue-based or analytical impedance ratio methods; second computing harmonic voltage amplification (HVA) and current amplification (HCA) indices at those frequencies using short-circuit and load-flow derived impedances; and third assigning qualitative risk ratings (Low/Medium/High/Critical) based on amplification thresholds, proximity to dominant harmonic orders (e.g., 5th, 7th, 11th, 13th), and IEEE 519-2022 compliance margins. The tool supports scenario comparison (e.g., base case vs. solar farm expansion), sensitivity analysis (capacitor bank switching, filter tuning), and documentation traceability for regulatory reporting and interconnection studies.