Power System Studies
Harmonic Analysis
Power-quality studies for facilities with VFDs, UPS systems, and other non-linear loads. We diagnose distortion before it damages equipment.
Overview
Variable-frequency drives, rectifiers, and UPS systems pull non-sinusoidal current that distorts voltage waveforms across the facility. Excessive harmonic distortion causes transformer overheating, capacitor failure, neutral overload, and nuisance tripping. We measure existing distortion with power-quality recorders, model the system in ETAP or EasyPower, and recommend filters, transformer K-factor specifications, or VFD configuration changes that bring you back into IEEE 519 compliance.
What's included
Scope of work
On-site harmonic measurement (typically 7–14 days with PQ recorders)
Source impedance characterization
Frequency-domain modeling of the distribution network
Voltage and current distortion calculation at the point of common coupling
IEEE 519 compliance evaluation
Mitigation recommendation: passive filters, active filters, K-factor transformers, or drive-side mitigation
Methodology
How the engagement runs
We agree on inputs, responsibilities, and deliverables before the work begins, then keep the design decisions connected through each stage.
Harmonic Analysis: how the engagement runs
- 1PQ recordingClass A power-quality meters deployed at the service and selected feeders for 7–14 days.
- 2Network modelingFrequency-domain model built reflecting transformer impedances, cable, and VFD/rectifier sources.
- 3Distortion analysisTHD-V and THD-I evaluated against IEEE 519 limits at the PCC and at problem buses.
- 4Mitigation designFilter tuning, transformer phase-shifting, or drive-side LCL filter recommendations modeled and verified.
- 5ReportPE-stamped report with measurement data, simulation results, and prioritized recommendations.
Engineering scope
Project-specific
Disciplines, deliverables, licensing, and sealing requirements confirmed for your project before work begins.
Response
1 day
We respond to every inquiry within one business day to discuss scope, next steps, and the information needed for a proposal.
Veteran-owned
VOSB / SDVOSB
SAM.gov registered. UEI H6HAZKAD4LJ7 · CAGE 08E02. Set-aside eligible.
When you need it
Triggers
- →Wastewater or pump-station VFD installations
- →Transformer or capacitor overheating
- →Neutral conductor overheating in 3-phase 4-wire systems
- →Utility power-factor or distortion penalty
- →New VFD or UPS commissioning
What you receive
Deliverables
- PE-stamped harmonic analysis report
- PQ measurement data exports
- Single-line and harmonic-source identification
- Mitigation design package (filter specs, transformer specs, drive settings)
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Let’s define the right scope for your project.
Share your project location, current plans, and target schedule. We’ll follow up to confirm the scope and information needed for a proposal.