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INTEGRAL ASSESSMENT CRITERION OF COMMUTATION MARGIN IN LINE COMMUTATED THYRISTOR INVERTER AT STATES OF ASYMMETRY IN THE POWER SYSTEM
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| Author(s) |
L. Frackowiak; G. Plenzler; J. Zyborski |
| Abstract |
Line commutated thyristor inverters used to energy transmission to the power system from DC constant voltage sources (e.g. MHD generator, regenerative load testing of large internal combustion engines, etc.) need special control procedure against AC fault conditions. The paper proposes a new original system to determination of the minimum angle of thyristors triggering advance at short circuits. The system being reported predicts required commutation margin. It analyses current load and time integral of wave form of commutation voltage. The paper presents schematic block diagram and performance of the inverter control system at different states of operation. Theoretical considerations are illustrated by exemplary wave forms of inverter current and thyristor voltages at faults in the power system. The wave forms were obtained by digital simulation. The reported inverter system is immune to the states of voltage asymmetry in AC mains. It can co-operate with either synchronous or asynchronous controller. |
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| Filename: | Unnamed file |
| Filesize: | 2.506 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-23 by System |
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