Modeling and Simulation: Electric Machines and Power Systems

Simulation and modeling are two powerful tools that help in simplifying analysis and providing critical insights into real-life systems. Not only they are easier to conduct but also ensure repeatability. In addition to saving an enormous amount of manufacturing time, simulating a system can also forecast and predict results based on the operating conditions.

A part of this work is an attempt to model and simulate induction machines which are one of the key elements of power electronics and power systems. The first chapter deals with design of an induction machine where multivariable implicit differential equations are solved. An important and well-established problem of high inrush current during starting has been. Three primary methods namely direct-online start, star-delta start, and constant V/Hz operation have been carried out and their performances have been compared across various parameters and conditions. The foundation and principles of using a six-step inverter to run constant V/Hz operation are also studied in chapter one. A more crucial problem of microgrid stability has been addressed in later sections. Many island-based homes and factories get disconnected from the grid in case of bad weather and natural disasters. Therefore, the islands must be capable enough of self-sustaining themself with distributed energy resources that can help in powering up while being cut off from the utility grid. Chapter two models and simulates a microgrid operating before and after islanding. The main aim of this work is to help understand the stability of microgrid and calculate the time taken for the frequency and amplitude to reach back to the rated values.