This book provides an in-depth introduction to the dynamic characteristics of Integrated Energy Systems (IES). It establishes a unified energy network model, elucidating the complementarities between various forms of energy, the conversion efficiencies, and the interactions and influences on operating costs. The book proposes methods for the planning, configuration, and operational control of IES and develops a simulation system for the integration of multi-physical field analog, hybrid transient, and steady-state conditions. The established mathematical models and simulation system are utilized to conduct a series of analyses under typical integrated energy scenarios. These analyses evaluate the operational performance and economic benefits of IES across different conditions. This book serves as a valuable resource for professionals involved in the research, planning, design, consulting, research and development, and operation of businesses related to integrated energy systems. It also serves as an essential reference for educators and college students.