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http://dx.doi.org/10.5370/JEET.2016.11.6.1645

Modeling and Control Design of Dynamic Voltage Restorer in Microgrids Based on a Novel Composite Controller  

Huang, Yonghong (School of Electrical and Information Engineering, Jiangsu University)
Xu, Junjun (School of Electrical and Information Engineering, Jiangsu University)
Sun, Yukun (School of Electrical and Information Engineering, Jiangsu University)
Huang, Yuxiang (School of Electrical and Information Engineering, Jiangsu University)
Publication Information
Journal of Electrical Engineering and Technology / v.11, no.6, 2016 , pp. 1645-1655 More about this Journal
Abstract
A Dynamic Voltage Restorer (DVR) model is proposed to eliminate the short-term voltage disturbances that occur in the grid-connected mode, the switching between grid-connected mode and the stand-alone mode of a Microgrid. The proposed DVR structure is based on a conventional cascaded H-bridge multilevel inverter (MLI) topology; a novel composite control strategy is presented, which could ensure the compensation ability of voltage sag by the DVR. Moreover, the compensation to specified order of harmonic is added to implement effects that zero-steady error compensation to harmonic voltage in specified order of the presented control strategy; utilizing wind turbines-batteries units as DC energy storage components in the Microgrid, the operation cost of the DVR is reduced. When the Microgrid operates under stand-alone mode, the DVR can operate on microsource mode, which could ease the power supply from the main grid (distribution network) and consequently be favorable for energy saving and emission reduction. Simulation results validate the robustness and effective of the proposed DVR system.
Keywords
Dynamic voltage restorer; Microgrid; Short-term voltage disturbance; Composite control strategy; Compensation to harmonic voltage in specified order;
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