An overview of harmonics in power transmission networks

Today problems associated with the harmonics have become a serious problem due to increased use of power electronics and converters, the fact that the nature of the system is changing and because of elements that can impact the change of a network impedance, such as long cables or transmission lines etc. This paper gives an overview on nonlinear components which may cause harmonics in power transmission networks, such as HVDC links, wind power plants, Flexible Alternating Current Transmission System devices (FACTS), variable frequency drives (VFDs) that power electric motors, Static Var Compensators (SVC) and other voltage source converter technologies.