A short overview of the electrical machines control based on Flatness-technique

Optimal linear controllers and high computational non-linear controllers are normally applied to control the nonlinear systems. Flatness control method is a control technique for linear systems as well as nonlinear systems by static and dynamic feedback namely as endogenous dynamic feedback. This method takes into account the non-linear behavior of the process while preventing complicated computations. An important feature of flat systems is that their states and inputs can be expressed in terms of flat output variables and a finite number of its derivatives. Systems with flat properties have several advantages in different categories such as power electronics, electrical hybrid systems, electrical machines, etc. The objective of this paper is to provide an overview of this control method in electrical machines. In this application, using this control technique prepares the power and frequency regulation, prevents the system from the uncontrollable behavior, etc. Since the outputs of flat systems are not unique and no systematic method exists to figure out these outputs, in this paper the flat variables are introduced to help researchers to comprehend flat systems components.