Coordinative Control of Tuned Fuzzy Logic and Modified Sliding Mode Controller in PMSG-Based Wind Turbines

Abstract

The work reported in this research chapter is to implement the power maximization control technique toward the rectifier side of the PMSG-based grid-connected WECS. To prove that, proposed tuned two input fuzzy-based maximum power point tracking controller is better than the normal fuzzy-based single input MPPT controller. The simulation results of both the controllers are realized and the substantiating improvement in terms of real power produced across the grid is analyzed. It is found that the performance of tuned FLC is better. In most of the existing literatures, commonly occurring asymmetrical faults are taken for consideration to assess the transient study of the WECS. As a second part of analysis, in the proposed work, rarely occurring faults such as three-phase symmetrical fault (LLL) are also taken into account along with asymmetrical fault and the study is thoroughly conducted by injecting the fault towards the grid side in MATLAB Simulink environment. The motive of this study is that, though the symmetrical fault is rarely occurring, the negative impact it creates on the system is very high. It is a main factor that has to be considered while designing the controllers. SMC is proposed in order to bring the system back to the normal state during the period of fault occurrence for any kind of fault towards the grid side. This chapter throws light on a fact that even during grid fault conditions, the proposed tuned FLC and SMC holds good in coordination of system functions. The entire wind system is modeled in such a way that there is perfect coordination between tuned FLC and SMC during steady-state and transient-state conditions.