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Digital Repetitive Control of a Three-Phase Flat-Top-Modulated Grid Tie Solar Inverter
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| Author(s) |
Stefan ENGEL, Klaus RIGBERS, Rik W. DE DONCKER |
| Abstract |
Grid connected solar inverters are used to feed energy generated by a photovoltaic generator into the mains. High efficiency is a major requirement. Furthermore a low total harmonic distortion (THD) of the output current is needed to comply with regulations. This paper presents the control for a new highly efficient inverter topology. Due to disturbances of the grid voltage and non-linear effects such as dead-time effects in the output stage of the inverter, the output current is distorted, especially when using small output inductors. Furthermore, the investigated inverter is operated with 120° flat-top modulation to improve efficiency. However, this modulation scheme in combination with an LCL output filter leads to higher THD. As the current distortion is periodic with the grid voltage, a repetitive learning controller can be used to compensate it. In this paper, the design of a vector control including a repetitive controller is outlined. The results of the implementation of the control algorithm on hardware are presented. |
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| Filename: | 0280-epe2009-full-16402303.pdf |
| Filesize: | 796.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2010-01-27 by System |
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