Optimal Torque Control of PMSG-based Stand-Alone Wind Turbine with Energy Storage System

In this paper optimal torque control (OTC) of stand-alone variable-speed small-scale wind turbine equipped with a permanent magnet synchronous generator and a switch- mode rectifier is presented. It is shown that with OTC method in standalone configuration, power coefficient could be reached to its maximum possible value, i.e. 0.48. An appropriate control algorithm based on turbine characteristic is designed to extract maximum power from the turbine within a whole range of wind speed changes. Besides, energy storage devices (battery bank) are used to ensure continuous supplying loads and power quality. The AC loads are connected to the system via a single-phase inverter as domestic appliances. Dynamic stability of the system is also investigated to have a complete surveillance on the system operation in the conditions of hard wind speeds and maximum loads demand. The presented control method, and the other components of the system are modeled in MATLAB/SIMULINK environment. Simulation results show the good performance of the presented wind system in all case studies as well as active power balance.