Three-Phase Unbalanced Power System Modeling & Analysis

This course focuses on understanding and analyzing unbalanced three-phase power systems, which are becoming increasingly common in modern power networks. Traditionally, transmission systems were assumed to be balanced because loads were spread evenly across phases. However, with the rapid growth of electric mobility such as AC electric railways, electric vehicles, fast chargers, and other power-electronic-based loads, this assumption is no longer valid. These new types of loads often draw power unevenly, causing significant imbalance in the network.In this course, students will learn why and how unbalanced conditions occur in transmission systems and why conventional balanced analysis methods are insufficient in such cases. The course introduces detailed three-phase modeling techniques that accurately represent unbalanced loads, lines, and network components. Learners will gain a clear understanding of how voltages, currents, and power flows behave differently under unbalanced conditions.The course also covers analysis methods to study the impact of unbalance on system performance, including voltage unbalance, power losses, and stress on equipment. Special emphasis is given to quasi-steady state estimation, which helps in monitoring and assessing the operating condition of unbalanced power networks in real time. Practical insights are provided so that learners can relate theory to real-world power system operation.Overall, this course is designed to help students, researchers, and practicing engineers move beyond traditional balanced system assumptions and develop the skills required to analyze and operate modern power systems that include electric transportation and other emerging unbalanced loads.

Source: IIT Roorkey July 2018 [Youtube Channel]