UM
Unbalanced voltage swell and over-voltage control in dynamic voltage restorer
Lam,C. S.1; Dai,Ning Yi1; Wong,M. C.1; Han,Ying Duo1,2
2005-10-25
Source PublicationDianli Xitong Zidonghua/Automation of Electric Power Systems
ISSN1000-1026
Volume29Issue:20Pages:35-39
AbstractThe unbalanced voltage swell and over-voltage compensation problems in a transformerless dynamic voltage restorer (DVR) are discussed. Installation of a diode rectifier circuit for charging the DC-link storage capacitor only allows DVR to inject active power to distribution system during compensation. When swells or over-voltages happen, it's possible for the DVR to absorb active power from the system side. Applying in-phase or phase-invariant voltage injection control scheme will cause the DC-link voltage level to rise rapidly, and excess rise of the DC-link voltage will damage the storage capacitor or switching devices (IGBTs). Applications of minimum energy compensation scheme still cannot solve the DC-link voltage rise problem during unbalanced situation. A novel unidirectional power flow control algorithm is proposed in this paper. By rotating the reference load output voltage a certain angle, DVR three-phase does not absorb active power from the distribution system under either balanced/unbalanced swell and over-voltage situations, and the compensated load output voltage is a balanced and sinusoidal nominal value. The maximum DVR compensation limit has also been considered inside the control algorithm, so that the injected voltage does not exceed its compensation limit. An additional alleviating control strategy for solving the unavoidable DC-link voltage rise situation is also proposed. Finally, simulation results are presented to prove the validity and effectiveness of the proposed control algorithm.
KeywordActive power Dynamic voltage restorer (DVR) Over-voltage Voltage swell
URLView the original
Language英语
Scopus ID2-s2.0-27944454843
Fulltext Access
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorLam,C. S.
Affiliation1.University of Macau,Macau,Macao
2.Tsinghua University,Beijing 100084,China
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Lam,C. S.,Dai,Ning Yi,Wong,M. C.,et al. Unbalanced voltage swell and over-voltage control in dynamic voltage restorer[J]. Dianli Xitong Zidonghua/Automation of Electric Power Systems,2005,29(20):35-39.
APA Lam,C. S.,Dai,Ning Yi,Wong,M. C.,&Han,Ying Duo.(2005).Unbalanced voltage swell and over-voltage control in dynamic voltage restorer.Dianli Xitong Zidonghua/Automation of Electric Power Systems,29(20),35-39.
MLA Lam,C. S.,et al."Unbalanced voltage swell and over-voltage control in dynamic voltage restorer".Dianli Xitong Zidonghua/Automation of Electric Power Systems 29.20(2005):35-39.
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