A control strategy for grid-side converter of DFIG under unbalanced condition based on Dig SILENT/Power Factory

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Han, Pingping^1 ; Zhang, Haitian^1 ; Chen, Lingqi^1 ; Zhang, Xiaoan^2

New Energy Utilization and Energy Saving Laboratory, Hefei University of Technology, Hefei

230009, China^1

Intelligent Manufacturing Institute, Hefei University of Technology, Hefei

230009, China^2

关键词: Doubly Fed Induction generators (DFIG);    Grid side converters (GSC);    Negative sequence voltage;    Negative-sequence currents;    Rotating reference frame;    Unbalanced condition;    Unbalanced grid conditions;    Uninterrupted operations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/5/052025/pdf
DOI  :  10.1088/1755-1315/108/5/052025

来源: IOP

【 摘 要 】

The models of doubly fed induction generator (DFIG) and its grid-side converter (GSC) are established under unbalanced grid condition based on DIgSILENT/PowerFactory. According to the mathematical model, the vector equations of positive and negative sequence voltage and current are deduced in the positive sequence synchronous rotating reference frame d-q-0 when the characteristics of the simulation software are considered adequately. Moreover, the reference value of current component of GSC in the positive sequence frame d-q-0 under unbalanced condition can be obtained to improve the traditional control of GSC when the national issue of unbalanced current limits is combined. The simulated results indicate that the control strategy can restrain negative sequence current and the two times frequency power wave of GSC's ac side effectively. The voltage of DC bus can be maintained a constant to ensure the uninterrupted operation of DFIG under unbalanced grid condition eventually.