Power Quality & Harmonics
Modern power systems contain increasing penetrations of non-linear loads such as variable frequency drives (VFDs), rectifiers, UPS systems, and renewable inverters that inject harmonic currents into the network. MEPCO performs comprehensive harmonic load flow, frequency scans, resonance assessments, and harmonic filter designs to safeguard equipment and guarantee grid code compliance.
Figure 1: Harmonic spectrum frequency scan and resonance analysis displayed at MEPCO computational center.
Technical Scope & Engineering Capabilities
MEPCO Engineering Projects brings specialized domain knowledge, rigorous modeling standards, and practical site experience to every assignment. Our scope covers:
- Harmonic Load Flow Analysis: Calculating voltage Total Harmonic Distortion (THD) and individual harmonic voltages across all network buses.
- Current Distortion (TDD) Evaluation: Calculating Total Demand Distortion (TDD) and individual harmonic currents at the Point of Common Coupling (PCC).
- Impedance Frequency Scan: Plotting system driving point impedance vs. frequency to identify parallel and series resonance frequencies that could amplify harmonics.
- Harmonic Filter Design: Sizing and tuning passive harmonic filters (single-tuned notch filters, high-pass filters) and active harmonic filters (AHF).
- Power Factor Correction Harmony: Verifying power factor correction capacitor banks to avoid resonance with upstream supply transformers.
Software Platforms & Computational Tools
Primary Tool: ETAP Harmonic Analysis & Frequency Scan Modules.
Secondary Tool: PSCAD/EMTDC for high-frequency harmonic propagation and active filter modeling.
Applicable Standards & Grid Codes
Harmonic Limits: IEEE 519-2022 (Standard for Harmonic Control in Electric Power Systems).
Power Quality Standards: IEC 61000-3-6, IEC 61000-2-4, and National Utility Grid Code Power Quality Regulations.
Methodology & Project Delivery Workflow
Our engineering delivery aligns with MEPCO’s structured 6-stage project execution framework, ensuring quality throughout input verification, design modeling, and client handover:
- Stage 01 — Scope & Criteria Definition: Establish study boundaries, utility tie-in data, single-line diagrams, and client objectives.
- Stage 02 — Data Audit & Modeling Assumptions: Collect, verify, and validate manufacturer datasheets, impedance tolerances, and site operating configurations.
- Stage 03 — Simulation Model Development: Build detailed, validated mathematical digital models in specialized power software.
- Stage 04 — Computational Analysis & Verification: Execute base-case and contingency scenarios, conducting rigorous internal peer reviews.
- Stage 05 — Client Review & Approval: Present study findings, address technical comments, and participate in technical clarification sessions.
- Stage 06 — Final Handover: Deliver formal certified engineering reports, executive summaries, and native simulation model files.
Figure 2: Harmonic filter capacitor bank and active filter integration into industrial switchgear.
Completed Project References (From MEPCO Profile)
Selected project assignments delivered by MEPCO demonstrating our technical execution and regional client trust:
| Project Name | Client / Authority | Location | Tools / Mode | Scope Executed |
|---|---|---|---|---|
| Petrokemya North Plant | Saudi Petrochemical Company (SABIC) | Saudi Arabia | ETAP | Harmonic Distortion Analysis, Frequency Scan, and Transient Stability. |
| GAS-Jubail Industrial Plant | National Industrial Gases Company | Saudi Arabia | ETAP | Harmonic Analysis of VFD Drives, Resonance Assessment, and Filter Sizing. |
Key Engineering Deliverables & Outputs:
- Harmonic Analysis Engineering Report with individual and total distortion spectra.
- Impedance vs. Frequency Scan Curves identifying resonance frequencies.
- IEEE 519 Compliance Evaluation Tables comparing calculated VTHD and ITDD against utility limits.
- Harmonic Filter Sizing Datasheets (inductance, capacitance, damping resistance, tuning frequency).
- Native ETAP study model file.
Inquire About This Service
Contact MEPCO’s engineering team for technical proposals, study scope definition, or project consultations:
Email: m.khaled@mepco-tds.com | Phone: +20 11 2696 7082 | HQ: 5 Al-Ibrahimia Street, Cairo, Egypt