Doubly Fed Induction Machine-Based DC Voltage Generator with Reduced Oscillations of Torque and Output Voltage

The doubly fed induction machine (DFIM)-based DC voltage generator is equipped with a stator-connected diode rectifier. six-pulse rectifier as nonlinear circuit introduces harmonics in the stator and rotor current distorts voltage, well flux. This causes electromagnetic torque oscillations instantaneous power components oscillations. adversely impact mechanical parts of drive-train p component influence DC-bus can be somewhat cancelled by control methods. However, cancellation not strictly coupled power. paper presents an analysis methods aimed at reduction on output level stand-alone DFIM-based generator. Field-oriented FOC controllers space vector modulation-based direct DTC-SVM flux module regulation have been compared which one commanded variables, whereas second variable dot product vectors. contributions this are introduction new path method instead length proof that it reduce DFIG-DC system. Additionally, reveals for proper stator-to-rotor-turns ratio necessary converter power, lower obtained than required full realization side requested controllers. reason why, regardless method, cannot always fully cancelled, comparative study these conditions has conducted simulation laboratory tests.