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Impact of the switching frequency on the DC-side admittance in three-phase converter systems
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| Author(s) |
Jussi KOPPINEN, Marko HINKKANEN |
| Abstract |
Three-phase converter systems can be prone to negative impedance instability of the DC-bus. This paperstudies the dynamic interactions between the DC- and AC-sides of a current-controlled three-phase sys-tem in order to reveal possible risks of instability. The system is modelled by using a small-signal methodfrom a viewpoint of the DC-side. Time delays due to pre-calculation and discretization are considered.The stability analyses are performed for the small-signal model. The results of the stability analyses arecompared with time-domain simulations. Comparisons demonstrate good agreement. In addition, a stabi-lizing controller is developed for the example system. According to simulations, the proposed controllercan stabilize the system. |
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| Filename: | 0211-epe2014-full-10322635.pdf |
| Filesize: | 173.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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