**Special Issue on Standalone Renewable Energy System: Modeling and Controlling**

### **Rodolfo Dufo-López \* and José L. Bernal-Agustín**

Department of Electrical Engineering, Universidad de Zaragoza, C/María de Luna, 3, 50018 Zaragoza, Spain; jlbernal@unizar.es

**\*** Correspondence: rdufo@unizar.es

Received: 12 March 2020; Accepted: 13 March 2020; Published: 19 March 2020
