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A DIGITAL COMPUTER MODEL OF THREE-PHASE RECTIFIER / INVERTER SYSTEMS FOR TRANSIENT STUDIES
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| Author(s) |
R. J. Harrington; S. A. Gawish |
| Abstract |
The waveform and transient response of a three-phase rectifier bridge, a three-phase forced commutated inverter and a three-phase naturally-commutated inverter were simulated on a digital computer from basic circuit theory. The "real" characteristics of the thryristors were also simulated. The simulations were further modified to allow for three-phase currents with adjustable frequency to be used for adjustable speed drives or start-up of synchronous motors. The interaction between the load and the inverter circuit was investigated during the normal operation of the naturally-commutated inverter. The operations of that inverter during faults occurring both on the line and in the inverter circuit were also investigated. These faults included three-phase short circuit, line-to-line faults and thyristor failure. Each of the three FORTRAN developed computer programs has three subprograms. The first contains the logic concerned with the operation of six thyristors (and diodes) of the bridge. Depending upon which thyristors (and diodes) are conducting, the second subprogram determines the corresponding differential equations which will be solved in the third subprogram. |
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| Filename: | Unnamed file |
| Filesize: | 2.998 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-12 by System |
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