**Altan Gencer**

Department of Electrical and Electronics Engineering, Nevsehir H.B:V. University, Nevsehir 50300, Turkey; altangencer@nevsehir.edu.tr; Tel.: +90-5058-3962-85

Received: 24 April 2019; Accepted: 11 June 2019; Published: 15 June 2019

**Abstract:** Recently, wind energy conversion systems in renewable energy sources have attracted attention due to their effective application. Wind turbine systems have a complex structure; however, traditional control systems are inadequate in answering the demands of complex systems. Therefore, expert control systems are applied to wind turbines, such as type-1 and interval type-2 fuzzy logic control (IT-2 FLC) systems. An IT-2 FLC system is used to solve the complexity of the wind turbine system and increases the efficiency of the wind turbine. This paper proposes a new control approach using the IT-2 FLC method applied to a wind turbine based on a permanent magnet synchronous generator (PMSG) to improve the transient stability during grid faults. An IT-2 FLC was designed to enhance the fault ride-through performance of a wind turbine and was implemented to control the machine side converter and grid side converter of a wind turbine. The proposed algorithm performance of a wind turbine based on a PMSG was investigated for different types of grid fault. The analysis results verify that the interval type-2 fuzzy logic control system is robustly utilized under different operational conditions.

**Keywords:** permanent magnet synchronous generator; fault ride-through; interval type-2 fuzzy logic system; wind energy conversion
