Transmission Modeling and Analytics
Models, tools and methods to ensure resilient, reliable and clean transmission networks.
Research and Development Challenges
EPRI’s Transmission Planning research area supports the development and validation of planning study models, planning processes and frameworks, and reliability and resiliency assessment analytics. These are required to build a reliable, resilient, and economic transmission grid that integrates an evolving generation mix to supply an increasingly complex load, that can also act as a system resource. A major focus is on accurately representing emerging loads—such as EV charging stations, data centers, and hydrogen electrolyzers—alongside enhancements to the composite load model and support for utility adoption. Measurement-based approaches are being developed to improve load modeling accuracy, while aggregated DER models are being refined to support FERC Order 2222, ensuring better representation of distributed resources in transmission planning. Significant advancements are also being made in modeling and control of HVDC systems, including offshore wind integration and grid-forming capabilities. Generic models for FACTS and HVDC are being updated to reflect evolving system dynamics. Stability analysis is being strengthened through improved screening methods and new guidelines for sub-synchronous oscillation (SSO) analysis in EMT environments. Tools like the Advanced Reliability Toolset (ARTS) are being enhanced to support high-IBR systems, with improvements in contingency screening and node-breaker modeling using EMS data. On the planning front, frameworks such as the Resilient System Investment Framework (RSIF) and High Level Screening (HiLS) tool are being upgraded to support decarbonization pathways. Automated powerflow case creation and coordinated expansion planning tools (JHSMINE and ACEP) are being refined for co-optimization. Data analytics and outage statistics are being leveraged to improve reliability assessments, while topical webcasts and insights are being offered to keep stakeholders informed. Power quality and harmonic compliance remain critical, with updates to tools like GICHarm and B2E, and new guides addressing flicker, TRV, lightning transients, and temporary overvoltage. IBR harmonic models and study guides are also being revised. Finally, planning frameworks like CPLANET are being enhanced to integrate Grid Enhancing Technologies (GETs), with updated reference guides supporting their deployment. Collectively, these efforts aim to ensure grid reliability, resilience, and adaptability in the face of rapid technological and structural change.
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Related Deliverables
Validation of Reduced System Models
3002029744
Summarizes impedance scanning techniques to validate reduced models.
Inverter Interaction Screening
30020297824
This document strategizes how to pre-emptively screen for inverter interactions and plan for mitigation as required.
Impedance Characterization of PE Loads
3002029829
Assessing stability impact of large PE loads on power system using impedance characteristics.
GDO Reference Guide
3002029831
A reference for creating geomagnetic disturbance (GMD) operating guidelines.
Transmission Solution Software (CPLANET)
3002029839
Ooptimized transmission solutions that combined advanced transmission technologies, energy storage and conventional projects.
Advanced Methods for TRA
3002029834
Ooptimized transmission solutions that combined advanced transmission technologies, energy storage and conventional projects.
Line Rating in Transmission Planning
3002029841
Analyze the implications of using advanced line rating technologies, such as AAR and DLR, for long-term transmission expansion planning
HVDC Planning Guide - 2024 Update
3002029844
Summary of HVDC planning processes, study types, and modeling and simulation tool guidelines.
System Impact of HVDC Connections
3002029847
Provides insight into system reliability implication of HVDC links, identifies mitigation options, including advanced use of converter control capabilities.
IBR Short-Circuit Network Equivalencing
3002030169
Documents results of network equivalencing methods for fault and protection studies in systems dominated by IBRs.
IBR SC Modeling
3002030170
Summarizes the latest research and developments in short-circuit modeling of inverter-based resources.
Modeling of IBR and Load Interactions
3002030173
Summarizes the latest research on inverter-based resources and load interactions.
Boundary between EMT-RMS Domain TI
3002030470
The aim is to identify the characteristics that can help define the boundary between EMT and RMS domains.
Modular Eigenvalue Analysis
3002031345
Provides an overview of a modular technique to evaluate small signal stability of the power system.
Grid Strength Assessment Tool
3002030167
Helps in evaluating various system strength metrics during planning.
Key projects and Related Efforts
Area Leads