Abstract
This paper deals with a new torque ripple minimization method for a Switched Reluctance Generator (SRG). Although, the SRG has many advantages including simple and robust construction, and high power density as a generator, it has not been widely employed in the industry. One of the major drawbacks of the SRG is its high torque ripple that results in high noise operation of the generator. In this paper, a non-unity Torque Sharing Function (TSF) is proposed to minimize the torque ripple over a wide speed range of operation. Simulations as well as experimental results are presented to verify the effectiveness of the proposed torque ripple minimization technique.
Highlights
Switched Reluctance Generator (SRG) for wind power system does not have any winding and permanent magnets on its rotor
The electromagnetic torque equation of the SRG can be derived from the magnetization characteristics of one phase winding, which can be achieved through an experimental test or a finite element analysis (FEA)
It is desired to verify the effectiveness of the proposed torque ripple minimization technique for higher wind speed by considering the power captured from the wind turbine
Summary
Switched Reluctance Generator (SRG) for wind power system does not have any winding and permanent magnets on its rotor. The magnetic independence among phases permits the machine to keep operating when phase-lacking faults occur, if a proper power converter and related control procedure are used. This leads the SRG to have a better fault tolerance ability [2,3,4,5]. This high inductance prevents a current from building up to a desired value rapidly This phase current error, in turn, induces an additional torque ripple. A novel non-unity TSF will be introduced to minimize the torque ripple over a wide speed range of operation. Unlike the traditional TSFs, the sum of all the normalized phase torque references is not unity. Improvement in the performance of the proposed torque minimization technique will be demonstrated through simulation results and experimental results
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