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CASCADE SYSTEM WITH VARIABLE INVERTERS STRUCTURE OF THE TYPE CVI-DC FOR HIGH POWER DRIVES
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| Author(s) |
W. Koczara; L. Grzesiak; H. Drechsler |
| Abstract |
In the paper the cascade system with variable inverters structure of the type CVI-DC is shown. Cascade systems with slip-ring induction motor are most frequently applied to high power drives of pumps and funs. To reduce the disadvantagageous reaction on supplying network these drives are build with 12-pulse inverters. Additional application of system with variable structure of inverters switched in function of angular speed of the motor to serial or parallel action enables reduction of reactive power absorbed from the grid. Furthermore, rated power of inverters and transformers is smaller. In the paper decomposition method for analysis of CVI-DC system is proposed Mathematical models of individual block in decomposed system (i.e. motor, inverter, transformer) are presented. Equations of multi-port networks are derived and original method for transients calculations in decomposed system is proposed which takes advantage of solutions distribution on to free and forced components and introduces the notion of instantaneous transmission coefficients. |
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| Filename: | Unnamed file |
| Filesize: | 3.609 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-03 by System |
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