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Performance Improvement of DC-link Control for a Dynamic Voltage Restorer with Power Feedforward Compensation
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 Title & Authors
Performance Improvement of DC-link Control for a Dynamic Voltage Restorer with Power Feedforward Compensation
Ji, Kyun Seon; Jou, Sung Tak; Lee, Kyo-Beum;
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 Abstract
This paper proposes a power feedforward technique for the performance improvement of DC-link voltage control in the dynamic voltage restorer (DVR). The DC-link Voltage is able to be unstable for an instant owing to any change in the load and voltage sag. The distortion of the DC-link voltage leads to the negative influence on the performance of DVR. To mitigate the distortion of the DC-link voltage, the power feedforward component is calculated by the load power and the grid voltage, and then it is added to the reference current of the conventional DC-link voltage controller. By including output power feedforward component on the DC-link controller, the DC-link voltage can settle down more quickly than when the conventional DC-link voltage controller applied. The proposed technique was validated through the simulation and experimental results.
 Keywords
Dynamic voltage restorer;Power feedforward;DC-link voltage control;
 Language
Korean
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