This book is an open access book. This book provides an overview of the ERIGrid validation
methodology for validating CPES a holistic power system testing method. It introduces readers
to corresponding simulation and laboratory-based tools including co-simulation real-time
simulation and hardware-in-the-loop. Selected test cases and validation examples are provided
in order to support the theory discussed. The book begins with an introduction to current power
system testing methods and an overview of the ERIGrid system-level validation approach. It then
moves on to discuss various validation methods concepts and tools including simulation and
laboratory-based assessment methods. The book presents test cases and validation examples of
the proposed methodologies and summarises the lessons learned from the holistic validation
approach. In the final section of the book the educational aspects of these methods the
outlook for the future and overall conclusions are discussed. Given its scope the book will
be of interest to researchers engineers and laboratory personnel in the fields of power
systems and smart grids as well as undergraduate and graduate students studying related
engineering topics.