User Defined Model Development
Modern power system operators demand accurate, validated mathematical simulation models to evaluate the dynamic impact of new power plants. MEPCO develops, tunes, and validates custom User-Defined Models (UDM) in PSSE and PSCAD/EMTDC for conventional gas/steam turbines, combined-cycle plants, renewable wind turbine generators (WTG), solar PV inverter stations, Battery Energy Storage Systems (BESS), and specialized protection controllers.
Figure 1: Mathematical control block diagram and parameter tuning for PSSE user-defined dynamic model at MEPCO.
Technical Scope & Engineering Capabilities
MEPCO Engineering Projects brings specialized domain knowledge, rigorous modeling standards, and practical site experience to every assignment. Our scope covers:
- Custom Generator & Turbine Modeling: Developing dynamic models for multi-shaft gas turbines, steam turbines, speed governors, and excitation systems (AVR / PSS).
- Renewable Inverter-Based Resource (IBR) Models: Formulating generic and vendor-specific models for wind turbines (Type 3 DFIG, Type 4 Full Converter) and solar PV inverters with fast active/reactive power control.
- PSSE Fortran Code Development: Writing, compiling, and debugging custom user-written dynamic models (UDM) integrated into Siemens PTI PSSE dynamic engine.
- PSCAD / EMTDC Detailed Electromagnetic Models: Building detailed converter control loops (PLL, inner current control, DC bus control) for electromagnetic transient assessment.
- Model Benchmarking & Step-Response Verification: Subjecting models to frequency, voltage, and mechanical power step disturbances to verify mathematical convergence and physical reality.
Software Platforms & Computational Tools
Primary Tool: Siemens PTI PSSE (Fortran compiler, user-defined dynamic libraries).
EMT Tool: PSCAD / EMTDC (custom component modeling, C/Fortran interface).
Applicable Standards & Grid Codes
Dynamic Guidelines: WECC Dynamic Modeling Guidelines, IEEE Task Force on Generator Model Validation.
Grid Code Specs: EETC, SEC / National Grid SA, and DEWA dynamic modeling specifications.
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: Conventional thermal power plant modeled and validated through custom dynamic simulation blocks.
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 |
|---|---|---|---|---|
| Rabigh IPP-2 Conventional Power Plant | Elsewedy PSP Company | Egypt / KSA | PSSE | Developing PSSE User-Defined Models for Turbine, Governor & AVR; Load Flow & Short Circuit; Dynamic Model Acceptance. |
Key Engineering Deliverables & Outputs:
- Compiled Model Object Files and DLLs for PSSE and PSCAD execution.
- Documented Source Code and Transfer Function Block Diagrams.
- Model Parameter Sheets detailing all gain, time constant, and limiter values.
- Step-Response Benchmark Test Reports confirming dynamic stability.
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