To main content

Time Domain Implementation of Rational Models of Power System Components With Calculation of Instantaneous Power Dissipation and Absorption

Abstract

Frequency-dependent modeling of components and subsystems using rational functions allows fast and accurate representation of the component's terminal behaviors in electromagnetic transient simulation studies. One shortcoming with general state-space model formulations of the rational model is that it is not possible to directly simulate the component's active losses during transient excitations, for instance when the losses are to be used as input for thermal calculations. In this work we propose applying an add-on secondary model for calculation of the losses. The secondary model is based on a circuit equivalent formulation which takes the component terminal voltages as input. Precise calculation of instantaneous power dissipation (active losses) is achieved by using currents/voltages through/over resistors as state variables. The power absorption in dynamic elements is also calculated. The proposed approach is verified via theoretical examples and applied to a cable system within a motor drive.

Category

Academic article

Language

English

Author(s)

Affiliation

  • SINTEF Energy Research / Elkraftteknologi
  • Mexico

Year

2025

Published in

IEEE Transactions on Power Delivery

ISSN

0885-8977

Page(s)

10 - 10

View this publication at Norwegian Research Information Repository