**Preface to "Modeling, Simulation and Control of Wind Diesel Power Systems"**

Welcome to the Special Issue: "Modeling, Simulation and Control of Wind Diesel Power Systems (WDPS)". Seven articles have been published in this Special Issue. The article that best follows the "spirit" of the Special Issue is the "Review on Dynamic Simulation of Wind Diesel Isolated Microgrids". I recommend that potential readers start with this article. Two more articles deal strictly with WDPS: "Flywheel Energy Storage and Dump Load to Control the Active Power Excess in a Wind Diesel Power System" presents dynamic simulations of a WDPS that includes a flywheel energy storage system (FESS) and shows how the FESS stabilizes the microgrid and improves the system power quality. "Study of the Intelligent Control and Modes of the Arctic-Adopted Wind–Diesel Hybrid System" shows the architecture of an advanced control system with different control options for WDPS located in the artic area, and how to tackle the very low temperatures and the icing of the blades of the wind turbine generators (WTGs). Another two articles also present dynamic simulations of isolated microgrids: "Study and Simulation of a Wind Hydro Isolated Microgrid" deals with modeling a high-penetration wind-hydro microgrid, and its main simulation is a transition from the only wind operation to the wind-hydro operation. "An Adaptive Control Scheme for Variable Speed Wind Turbines Providing Frequency Regulation in Isolated Power Systems with Thermal Generation" presents adaptative control that commands variable-speed WTGs to support frequency in an isolated system with controlled thermal generators, minimizing the WTGs mechanical and electrical efforts. Last but not least, two articles show logistic simulations: "Long-Range Integrated Development Analysis: The Cuban Isla de la Juventud Study Case" studies 25% and 100% scenarios of renewable energy penetration in the Cuban island of "la Juventud". "Taking into Consideration the Inclusion of Wind Generation in Hybrid Microgrids: A Methodology and a Case Study" presents methodology to facilitate the addition of wind power generation to photovoltaic-diesel isolated microgrids.

I hope that this Special Issue is helpful to students, researchers, and professors.

> **Rafael Sebasti´an Fern´andez** *Editor*
