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SPACE VECTOR PWM STRATEGY FOR 3-LEVEL INVERTERS WITH DIRECT SELF-CONTROL
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| Author(s) |
A. M. Walczyna; R. J. Hill |
| Abstract |
A novel pulse width modulation (PWM) strategy for induction motor drives with direct self-control and a free-running 2-level torque controller is descrlbed. The technique is based on space vector modulation achieved with look-up tables and logic circuits. The method is very flexible allowing the generation of many PWM patterns, including switching preferences and avoiding 3-level inverter switching collisions. In the paper, detailed consideration is given to the PWM patterns consisting of full, intermediate and half voltage vectors. The techniques of generating a dodecagonal flux trajectory and of reducing stator current reactive distortion with 2-level torque control are demonstrated. Methods for neutral point voltage control are proposed and the problem of a drive transition from a 6-pulse to a 12-pulse mode is discussed. The properties of the method are illustrated by simulation of a high-power traction drive. |
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| Filename: | Unnamed file |
| Filesize: | 3.586 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-08 by System |
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