Meshed transmission systems explained for students and engineers

The role of transmission grids is becoming increasingly central as the energy transition progresses, creating a growing need for a rigorous understanding of the power system as a whole. Fundamentals of Power Transmission Systems covers transmission lines, synchronous and converter-connected generators, power transformers, and high voltage direct current links. Power flow calculations, the use of symmetrical components for unbalanced fault analysis, reliability assessment, and grounding methods are treated as well. The authors explain the underlying physical phenomena and derive the governing equations required to understand the power system behavior.

Further topics include voltage and frequency control as well as transmission system planning and operation. Five detailed case studies of large disturbances are presented—including the 2003 blackouts in North America, Italy, and southern Sweden and eastern Denmark, the 2006 Continental European system split, and the 2025 blackout on the Iberian Peninsula.

Fundamentals of Power Transmission Systems serves university students studying power systems and engineers seeking a current, equation-driven reference on transmission system analysis. The book also enables experienced professionals to refresh, update, and broaden their knowledge. In addition, readers will find calculation exercises with solutions to support self-study and practical application.

Liisa Haarla, DSc, is a Senior Advisor at the Finnish transmission system operator Fingrid Oyj. She previously served as Professor of Power Transmission Systems at Aalto University. Her expertise includes transmission system engineering and planning, power system dynamics, reliability, and security. Dr. Haarla is a CIGRE Honorary Member, a Senior Member of IEEE, and a member of the Finnish Academy of Technology. She received the CIGRE Women in Energy Award in 2021.

Janne Seppänen, DSc, is an Assistant Professor at Aalto University, where he leads the Power Transmission Systems research group. Before joining Aalto full-time, he held several positions at Fingrid Oyj and worked as a scientist at ABB Corporate Research in Switzerland. He also served as a part-time Professor of Practice at Aalto University. His expertise includes transmission system planning, power system dynamics and stability, and power system monitoring. He is a Senior Member of IEEE.