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Proceedings of the Second International Energy 2030 Conference,
November 4-5, 2008, Abu Dhabi, U.A.E.

Improved CSI Fed Induction Motor Drive for Oil Pumps in ADNOC

Abdul Rahiman Beig

The Petroleum Institute, UAE

Majid Poshtan

The Petroleum Institute, UAE

Abstract
Current source inverter fed drives have short circuit protection and built in regeneration capability. Hence they are most suitable for medium voltage high power applications such as fan drives, pump drives in heavy industries like oil and gas industry [1-3]. The conventional CSI fed induction motor drives use large capacitor across motor terminals to smooth the voltage waveforms by suppressing the voltage spikes caused due to inverter switching. The presence of these capacitors results in resonance between motor inductor and capacitor [1,3]. In order to avoid the resonance, the CSI fed induction motors employ selective harmonic elimination PWM, are not operated at low speeds and are accelerated at rapid rate during starting [3]. Also these drives inject harmonics to the power system. In order to reduce these harmonics, the conventional drives use multi pulse rectifier and passive filter. Multi pulse rectifier requires an additional transformer, which adds to the system cost [3]. This paper proposes an improved CSI fed induction motor drive which not only overcomes the limitations of the existing drive and also results in sinusoidal motor waveforms and sinusoidal input waveforms.




 

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