This book focuses on impedance source inverters, discussing their classification, advantages, topologies, analysis methods, working mechanisms, improvements, reliability, and applications. It summarizes methods for suppressing DC-link voltage spikes and duty loss, which can pose a problem for researchers; and presents novel, efficient, steady state and transient analysis methods that are of significant practical value, along with specific calculation examples. Further, the book addresses the reliability of impedance source inverters, adopting a methodology from reliability engineering to do so. Given its scope, it offers a valuable resource for researchers, engineers, and graduate students in fields involving impedance source inverters and new energy sources.