Orlando, Natalia Angela5; Liserre, Marco2; Mastromauro, Rosa Anna4; Dell’Aquila, Antonio4
1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science, Aalborg University, VBN3 Politecnico di Bari4 Converters, Elictrical Machines, and Drives Research Team, Politecnico di Bari5 Politecnico di Bari
In the field of wind energy generation particular interest has been focused in recent years on distributed generation through small wind-turbines (power unit 200 kW) because of their limited size and lower environmental impact. The field of small generation was dominated by the use of asynchronous generators directly connected to the grid, while recently permanent magnet synchronous generators (PMSG) with power converter, either partially or fully controlled, became popular. This paper reviews the control issues related to these small wind-turbine systems: generator torque control, speed/position estimation, pitch control, braking chopper control, dc/dc converter control, and grid converter control. Specific issues for small wind-turbines arise in the wind energy extraction optimization and limitation and in the innovative concept of “universal” wind-turbine operation, that leads these system to operate grid-connected, standalone or in load supporting mode.
I E E E Transactions on Industrial Informatics, 2013, Vol 9, Issue 3, p. 1211-1221
Back-to-back converter; Universal control strategy; Wind-turbine systems