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Passivity Improvement of the Grid Connected VSI using Active Damping and Investigation of Inaccuracy of the Direct Discrete Plant Model
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| Author(s) |
Gyanendra Kumar SAH, Michael SCHÜTT, Hans-Günter ECKEL |
| Abstract |
It is proved in this work that even the most accurate direct discrete-time plant model fails to exactly represent the PWM-based Voltage Source Inverter (VSI) connected to the grid via L-filter for all grid conditions due to the incapability to sample the present average voltage at the Point of Common Coupling (PCC). Thus, a state observer derived from the direct discrete-time plant model can not accurately estimate future signals to compensate for the unavoidable digital delays forall frequency ranges. Therefore, this compensation method does not provide passivityto the PWM-based converter. Active damping is a simple and straightforward solution to improvethe passivity of the converter by increasing the converter's positive resistance. But the activedamping in the discrete-time domain could deteriorate the passivity plot if not done correctlydue to delays in the system. An accurate way to realize the active damping is proposed to improvethe passivity of a PWM-based power converter. |
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| Filename: | 0080-epe2023-full-10264167.pdf |
| Filesize: | 1.818 MB |
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| Type |
Members Only |
| Date |
Last modified 2023-09-24 by System |
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