Open AccessTransformer‐less dynamic voltage restorer based on a three‐leg ac/ac converter
Author(s) -
Zhou Min,
Sun Yao,
Su Mei,
Li Xing,
Lin Jianheng,
Liang Jian,
Liu Yonglu
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5396
Subject(s) - transformer , voltage , commutation , capacitor , computer science , control theory (sociology) , topology (electrical circuits) , electrical engineering , electronic engineering , engineering , control (management) , artificial intelligence
A transformer‐less dynamic voltage restorer (DVR) with bipolar voltage gain capability is proposed in this study. The DVR is formed by a three‐leg ac/ac converter with its output capacitor in series with the transmission line. Since the energy used for voltage compensation is obtained from the grid, long‐time voltage disturbances can be compensated without using bulky energy storage elements. As a result, the proposed DVR has the features of compact structure, light weight, and low cost. Moreover, it also has a high reliability as the commutation problem is avoided by adopting the proposed modulation strategy. A detailed analysis of the topology structure and operation principle is given, followed by the developed control method. Finally, simulations and experimental results are presented to verify the validity of the DVR.