Performance and Operation Management - Wind Energy Systems for Electric Power Generation - page 136

6.3.2.2 Vector Control
Vector control is an advanced method to control electrical machines [Quan08]. An
example of vector control of a WES with doubly-fed asynchronous generator is il-
lustrated in Fig. 6.14 [Mue02]. Generator power and reactive power are controlled
independently by means of two PI-controllers. From measured values of terminal
voltage and current actual values of the control variables P G and Q G are calculated
and compared with set values P G , set and Q G , set . Stator and rotor current components
in dq-frame, i Rdq and i Rdq , are calculated from phase currents by means of vector
Fig. 6.15 Waveforms of the WES quantities during an example wind regime