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CONTROL OF THE NEUTRAL POINT OF A THREE-LEVEL-INVERTER
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| Author(s) |
H. L. Klaver |
| Abstract |
Since many years several types of inverters are used for the drive of squirrel cage induction machines. The upper limit in power is shifted over the 1 MW since the introduotion of three-level inverters and the availability of large GTO-switches. This type of inverter ia also called Neutral-point-clamped inverter. This inverter is a voltage source inverter in which the dc link capacitor is split into two to create a third level. One of the key items in controlling a three-level inverter is keeping the neutral point (= zero level) at a constant value of half the overall voltage. For that reason an extra control loop shall be integrated in the PWM of a three-level inverter. Simulations of the PWM with the extra control loop have been carried out for different operating points and gave good results. Tests on a prototype of 3 MVA are planned for the summer of 1991. |
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| Filename: | Unnamed file |
| Filesize: | 2.468 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-16 by System |
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