**Preface to "Power Converter of Electric Machines, Renewable Energy Systems, and Transportation"**

Nowadays, energy is becoming more electrical in each field of engineering application, thus power converters have assumed an increasingly relevant role for electric machines, renewable energy and transportation systems. The converters' design and control are critical, as they are evolving into an essential component to interface and integrate different power systems. In this evolution, power converters' topology and technology play an enabling role in the advancement of electrical machines performances, renewable energy integration and emerging transport applications. The use of reliable and efficient electric machines is crucial in allowing the higher penetration of renewable energy in electrical systems, as well as in the ongoing change transport sector. Moreover, energy storage systems can be the way towards higher system flexibility and reliability. Consequently, it is necessary to develop innovative systems "devoted" to the specific application under study. Indeed, in recent years, research has been very active in working to improve each electric subsystem to achieve advantages in terms of system performances, robustness, easy installation, and maintenance. It is necessary to continue on this path in order to obtain significant technological advances.

> **Adolfo Dannier, Gianluca Brando, Marino Coppola** *Editors*

*Review*
