*Article* **Multi-Objective Tabu Search for the Location and Sizing of Multiple Types of FACTS and DG in Electrical Networks**

#### **Othón Aram Coronado de Koster \* and José Antonio Domínguez-Navarro \***

Department of Electrical Engineering, University of Zaragoza, María de Luna 3, 50018 Zaragoza, Spain

**\*** Correspondence: 544299@unizar.es (O.A.C.d.K.); jadona@unizar.es (J.A.D.-N.);

Tel.: +52-834-175-6334 (O.A.C.d.K.)

Received: 21 April 2020; Accepted: 22 May 2020; Published: 28 May 2020

**Abstract:** Flexible AC transmission systems and distributed generation units in power systems provide several benefits such as voltage stability, power loss minimization, thermal limits enhancement, or enables power system managemen<sup>t</sup> close to the limit operation points; and by extension, economic benefits such as power fuel cost and power loss cost minimization. This work presents a multi-objective optimization algorithm to determine the location and size of hybrid solutions based on a combination of Flexible AC transmission systems devices and distributed generation. Further, the work expands the types of FACTS usually considered. The problem is solved by means of a Tabu search algorithm with good results when tested in a network of 300 nodes.

**Keywords:** flexible AC transmission systems; tabu search; multi-objective; power systems
