Direct Voltage Control in Grids With Intermittent Sources Using UPFC

Silvangela. L. S. Lima; Robson F. S. Dias; Edson H. Watanabe

doi:10.18618/REP.2014.3.260267

Authors

Silvangela. L. S. Lima Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil
Robson F. S. Dias Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil
Edson H. Watanabe Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil

DOI:

https://doi.org/10.18618/REP.2014.3.260267

Keywords:

Direct Voltage Control (DVC), Indirect Voltage Control (IVC), Static Synchronous Compensator (STATCOM), Wind Generator (WG), Unified Power Flow Controller (UPFC)

Abstract

This paper proposes the use of a circuit with topology similar to an UPFC for direct voltage control in electric grids with highly intermittent generation sources such as wind generators. The variable characteristics of these sources strongly affect the voltage profile in the grids. The objective of this paper is to show through a conceptual analysis that it is possible to obtain precise and fast voltage control by using an UPFC. It is shown that the UPFC rating is smaller than that of a STATCOM or SVC, which should be necessary for indirect voltage control. The UPFC does not have limitation due to the number of operation per day as in the case of transformers with on load tap changer. The UPFC based on single-phase VSC is analyzed and the series converter is connected directly to the grid without transformer. It controls the voltage independently in each phase, therefore balancing it, if necessary. Simulation results using PSCAD/EMTDC are presented to confirm all these advantages of the use of UPFC for direct voltage control. The models used in this work are classic and well validated, being sufficient to prove the principles proposed.

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Author Biographies

Silvangela. L. S. Lima, Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil

was born in São Luís-MA, Brazil, in 1980. She received the B.Sc. degree in Electrical Engineering from the Federal University of the Maranhão and the master degree in electrical engineering from the Federal University of Rio de Janeiro (UFRJ) in 2007. She received the Ph.D degree in Electrical Engineering from the Federal University of of Rio de Janeiro (UFRJ) in 2013. Currently she works with electrical engineering department at UFRJ as a researcher. Her main research area includes FACTS performance in transmission and distribution systems and renewable generations (wind and solar).

Robson F. S. Dias, Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil

was born in Rio de Janeiro, Brazil, in 1978. He received the B.Sc. degree in Electrical Engineering from the Federal University of Pará and Ph.D. degree in electrical engineering from the Federal University of Rio de Janeiro (UFRJ), in 2002 and 2008, respectively. Currently his is a associate professor with electrical engineering department at UFRJ. His main research area includes FACTS technologies, transmission lines and electromagnetic transient studies.

Edson H. Watanabe, Universidade Federal do Rio de Janeiro - Electrical Eng. Dept. - COPPE, Rio de Janeiro, Brasil

got the Electronic Engineering and Master in Electrical Engineering degrees, in 1975 and 1976, respectively, from Federal University of Rio de Janeiro. In 1981, he got the Doctor of Engineering (D. Eng.) from Tokyo Institute of Technology, Japan. Since 1981, he is a professor at the Electrical Engineering Department, COPPE / Federal University of Rio de Janeiro. He has supervised 50 Master and 21 Doctors Thesis. His field of interest is Power Electronics Applied to Power Systems, including renewable generations (wind, solar and wave). He is one of the co-authors of the book “Instantaneous Power Theory and Applications to Power Conditioning”, published by IEEE Press /Wiley. Dr. Watanabe is a member of IEE-Japan, The Brazilian Society for Automatic Control, The Brazilian Power Electronics Society, CIGRE and PE, PEL and IA Societies of IEEE. He is a member of the National Academy of Engineering and received the 2013 IEEE-PES Nari Higorani FACTS Award.

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