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| Received:February 25, 2011Revised:June 15, 2011 |
| 基金项目:This work was supported by the National Natural Science Foundation of China (No. 61074086), and the Fundamental Research Funds for the Central Universities (No. HIT. NSRIF. 2009145). |
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| Energy-based modeling and control for grid-side converter of doubly fed wind generator |
| Huihui SONG,Yanbin QU |
| (School of Information Science and Engineering, Harbin Institute of Technology at Weihai) |
| Abstract: |
| To avoid dealing with the zero dynamics limitation brought by the bidirectional power flow through the back-to-back converter in a doubly fed wind generator, a new energy-based modeling and control approach for the gridside converter is presented. During the modeling process, the grid-side converter is divided into two subsystems with the feedback interconnection structure, and the interactive matrix of the model takes into account the concrete port structure. Then, an energy-based controller is proposed to realize the grid-side control objectives based on the new model. Simulation studies are carried out in MATLAB/Simulink. Comparative results between the proportional-integral controller and the energy-based controller show that the latter one can obtain faster convergence rate and global stability as the load current varies. Moreover, the energy-based controller is also competent for grid-side control when simulated in a 2 MW wind energy conversion system with random wind. |
| Key words: Wind energy Grid-side converter Energy-based control Port-controlled Hamilton |
