Three-Phase Dynamic Simulation of Power Systems Using Combined Transmission and Distribution System Models

TL;DR

This paper introduces a three-phase hybrid modeling method for power system transient analysis, enabling detailed study of unbalance effects without electromagnetic transient simulation, and presents the TPDA software for practical application.

Contribution

The paper develops a novel three-phase hybrid simulation methodology and implements it in TPDA, improving accuracy in transient stability analysis of unbalanced power systems.

Findings

TPDA accurately simulates electromechanical transients in hybrid models.

The methodology captures load and generation unbalances effectively.

TPDA offers improved stability assessment over traditional balanced models.

Abstract

This paper presents a new method for studying electromechanical transients in power systems using three phase, combined transmission and distribution models (hybrid models). The methodology models individual phases of an electric network and associated unbalance in load and generation. Therefore, the impacts of load unbalance, single phase distributed generation and line impedance unbalance on electromechanical transients can be studied without using electromagnetic transient simulation (EMTP) programs. The implementation of this methodology in software is called the Three Phase Dynamics Analyzer (TPDA). Case studies included in the paper demonstrate the accuracy of TPDA and its ability to simulate electromechanical transients in hybrid models. TPDA has the potential for providing electric utilities and power system planners with more accurate assessment of system stability than traditional dynamic simulation software that assume balanced network topology.