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AN IDEAL PWM-VSI INVERTER WITH FEEDFORWARD AND FEEDBACK COMPENSATION
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| Author(s) |
John K. Pedersen; Frede Blaabjerg; Johnny W. Jensen; Paul Thogersen |
| Abstract |
This paper presents different compensation techniques based on feedforward and feedback techniques for obtaining an ideal PWM-VSI inverter to AC-machines. Unlinearities like blanking-time, voltage drop across the power devices and DC-link voltage ripple cause torque and speed fluctuations in the AC-machine. Different techniques are proposed and tested for eliminating these unlinearities. The blanking-time compensation is done by both a phase current feedforward and a voltage vector feedback. The voltage drop compensation is realized with a current feedforward and finally the DC-link voltage ripple is compensated by a feedforward of the measured DC-link voltage. A comparison and the influence of the different compensation technique are done on a 16-bit microcontroller based PWM-VSI inverter. Test results show a significant improved performance of the AC-machine at no load and at low speed when the compensation techniques are used. |
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| Filename: | Unnamed file |
| Filesize: | 4.115 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-06-04 by System |
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