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Full-Text Articles in Engineering
Control Method For The Wind Turbine Driven By Doubly Fed Induction Generator Under The Unbalanced Operating Conditions, Xiangpeng Zheng
Control Method For The Wind Turbine Driven By Doubly Fed Induction Generator Under The Unbalanced Operating Conditions, Xiangpeng Zheng
ETD Archive
This thesis illustrates the principle and the behavior for doubly fed electric machines used in variable speed wind power systems under the balanced and unbalanced operating conditions. A generalized control method for complete stator pulsating power elimination and harmonic elimination in grid currents with adjustable power factor of a doubly fed induction generator under the unbalanced operating conditions is proposed. The theoretical analysis of this proposed control method is presented and then demonstrated by the simulation in Powersim®. The grid ride-through-fault ability by using the proposed method is also tested
Dspace Implementation Of A Generalized Method Of Harmonic Elimination For Pwm Boost Type Rectifier Under Unbalanced Operating Conditions, Ke Chen
ETD Archive
In this thesis, the implementation of a generalized method of harmonic elimination for the PWM boost type rectifier under severe fault conditions in the power system is presented. This method has been implemented by using DSPACE RT1104 digital control system. Control loop has been designed for real-time DC link voltage regulation. The simulation and experimental results verify the feasibility of the control scheme for input-output harmonic elimination. With the proposed method, unity power factor can be achieved as well as low-order harmonic elimination. High quality input and output waveforms of the three-phase PWM boost type rectifier are obtained under extremely …
A Novel Cascaded Multilevel Converter, Rajmohan Rangarajan
A Novel Cascaded Multilevel Converter, Rajmohan Rangarajan
ETD Archive
A novel cascaded multilevel converter is proposed in this thesis. The thesis proposes to produce more voltage levels from fewer H-bridges in a cascaded multilevel converter. The converter uses fewer H-bridges and the proposed switching scheme renders more voltage level in the staircase waveform with equal steps. Since the resulting voltage levels are equal, the angles are determined for the complete elimination of more unwanted harmonics. The implementation of the switching scheme, in single and three-phase configurations were simulated with Ansoft Simplorer♭ and the frequency spectrum of the resulting waveform and its total harmonic distortion are shown to verify the …