Accelerating EMT Studies by Merging Interconnected Transmission Lines with Applications in Protection and Stability Analysis

EasyChair Preprint 16026

Abstract

With the penetration of inverter-based resources in power grids, phasor-domain analysis (RMS analysis) is becoming less effective, and the demand for Electromagnetic Transient (EMT) analysis is growing. However, EMT analysis is computationally intensive, particularly for large-scale grids when a small simulation timestep is required. One of the grid components that limits the maximum allowable timestep is the Transmission Line (TL). Among different TL models, the Bergeron TL model is widely used in EMT studies on grid dynamics and protection. However, it restricts the maximum simulation timestep to the shortest propagation delay of the TLs in the grid. This paper proposes a mathematical method for merging the Bergeron models of interconnected TLs (i.e., TLs connected to a common bus) to allow the use of a simulation timestep up to twice the minimum propagation delay. This increases the speed of EMT simulations. The proposed model is evaluated using EMTP-RV. The results demonstrate that the proposed model enhances the simulation speed by nearly 41% for the test cases. However, the error in the results remains smaller than 2.1% in the test cases.

Keyphrases: Bergeron model, EMT, computational burden, model reduction, transmission line

@booklet{EasyChair:16026,
  author    = {Nasib Khadka and Reza Jalilzadeh Hamidi},
  title     = {Accelerating EMT Studies by Merging Interconnected Transmission Lines with Applications in Protection and Stability Analysis},
  howpublished = {EasyChair Preprint 16026},
  year      = {EasyChair, 2026}}