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COMPARISON OF z-TRANSFORMATION AND PULSE TRANSFER FUNCTION METHODS FOR THE STABILITY ANALYSIS OF SAMPLED DATA SYSTEMS
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| Author(s) |
H. A. Kojori; F. P. Dawson |
| Abstract |
Stability analysis and closed loop design of power converter systems by direct computation of their open-loop pulse transfer function is presented. This technique is compared with the z-transformation method and its advantages are discussed. As an illustrative example. the pulsed stability analysis of a current controlled AC-DC thyristor converter with a PI controller which is a typical sampled data system is considered. lt will be shown that the prediction of the region of absolute stability by the z-transformation method is quite tedious and does not provide any information about the relative stability of the system. In contrast, the pulse transfer function method is based on a direct computation in the s-domain and is therefore much simpler. Furthermore, the concept of absolute stability may be extended to predict relative stability of the system. The predicted region of stability and the dynamic performance of the illustrating example are verified with the Electro-Magneric Transients Program (EMTP). |
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| Filename: | Unnamed file |
| Filesize: | 2.143 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-09 by System |
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