Delta-CHB Statcom with Reduced Capacitance Through Third Harmonic Injection

Dayane do Carmo Mendonça; João Marcus Soares Callegari; Allan Fagner Cupertino; Heverton Augusto Pereira; Seleme Isaac Seleme Júnior

doi:10.18618/REP.2023.2.0052

Authors

Dayane do Carmo Mendonça Federal Center for Technological Education of Minas Gerais https://orcid.org/0000-0003-2425-0509
João Marcus Soares Callegari Federal Center for Technological Education of Minas Gerais https://orcid.org/0000-0001-6264-351X
Allan Fagner Cupertino Federal Center for Technological Education of Minas Gerais https://orcid.org/0000-0001-8418-1985
Heverton Augusto Pereira Federal University of Viçosa https://orcid.org/0000-0003-0710-7815
Seleme Isaac Seleme Júnior Federal University of Minas Gerais

DOI:

https://doi.org/10.18618/REP.2023.2.0052

Keywords:

Capacitor Voltage, Circulating Current, Delta-CHB, Energy Storage Requirements, STATCOM, Third Harmonic.

Abstract

This work investigates the third harmonic circulating current injection in delta-connected Cascaded H-Bridge (Delta-CHB) STATCOM, aiming the cell capacitance volume reduction. Firstly, analytical expressions for capacitor voltage ripple are derived without and with third harmonic injection. These expressions are used to obtain the third harmonic current waveform which minimizes the sum of capacitor voltages ripple in the whole operation range. These expressions are validated in an experimental setup based on 620 VA/220 V cell. Although this approach minimizes the ripple, an increase in the semiconductors current effort is expected. This paper quantifies the increase through analytical expressions and proposes an improved third-harmonic injection scheme which injects the third harmonic in a range of operating points. The performance of the proposed strategy is evaluated for a 17 MVA/13.8 kV Delta-CHB STATCOM with 24 cells per cluster. The results indicate a reduction of 17.2% in the theoretical cell capacitance. A physical realization of cell capacitor reveals that the proposed scheme, in the best scenario, reduces the volume in 25%. Finally, if the same power module and heatsink are employed, the proposed scheme leads to an increase in junction temperature of 13◦C for IGBT and diode.

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Author Biographies

Dayane do Carmo Mendonça, Federal Center for Technological Education of Minas Gerais

graduated in Electrical Engineering from the Federal University of Viçosa (UFV) in 2019. In April 2021, she was granted a Master’s degree in Electrical Engineering from the Graduate Program in Electrical Engineering at CEFET-MG/UFSJ. She is currently a doctoral student at the Graduate Program in Electrical Engineering at the Federal University of Minas Gerais (UFMG) and a specialist at the Gerência de Especialistas em Sistemas Elétricos de Potência (GESEP-UFV). Her main research interests include modular multilevel converters and renewable energy generation systems.

João Marcus Soares Callegari, Federal Center for Technological Education of Minas Gerais

graduated in Electrical Engineering from the Federal University of Viçosa (UFV) in 2019. In April 2021, he was granted a Master’s degree in Electrical Engineering from the Graduate Program in Electrical Engineering at CEFET-MG/UFSJ. He is currently a doctoral student at the Graduate Program in Electrical Engineering at the Federal University of Minas Gerais (UFMG) and a specialist at the Gerência de Especialistas em Sistemas Elétricos de Potência (GESEP-UFV). His current research and technical interests include design and control of grid-connected multifunctional inverters and reliability of power electronics based systems. Mr. Callegari was the recipient of the President Bernardes Silver Medal in 2019.

Allan Fagner Cupertino, Federal Center for Technological Education of Minas Gerais

was granted the B.S. degree in Electrical Engineering from the Federal University of Viçosa, Viçosa, Brazil, in 2013, the M.S. and Ph.D. degrees in Electrical Engineering from the Federal University of Minas Gerais, Belo Horizonte, Brazil, in 2015 and 2019, respectively. He was a guest Ph.D. student with the Department of Energy Technology, Aalborg University from 2018 to 2019. Since 2022, he has been with the Electric Engineering Department, Federal Center of Technological Education of Minas Gerais, where he is currently Assistant Professor of Power Electronics. His main research interests include renewable power generation systems, multifunctional inverters, MMC and reliability of power electronics based systems. Dr. Cupertino was the recipient of the President Bernardes Silver Medal in 2013. He is a member of the Brazilian Power Electronics Society (SOBRAEP) and Brazilian Society of Automatics (SBA).

Heverton Augusto Pereira, Federal University of Viçosa

received the B.S. degree from the Federal Federal University of Viçosa (UFV), Viçosa, Brazil, in 2007, the M.Sc. degree from the University of Campinas, Campinas, Brazil, in 2009, and the Ph.D. degree from the Federal University of Minas Gerais, Belo Horizonte, Brazil, in 2015, all of then in Electrical Engineering. He was a visiting Researcher from the Department of Energy Technology, Aalborg University, Denmark, in 2014. He worked as an Adjunct Professor with the Electric Engineering Department, UFV, since 2009. His main research interests include grid-connected converters for PV and wind power systems, and high-voltage dc/flexible ac transmission systems based on MMC.

Seleme Isaac Seleme Júnior, Federal University of Minas Gerais

holds a degree in Electrical Engineering from the University of São Paulo (1977), a Master’s degree in Electrical Engineering from the Federal University of Santa Catarina (1985) and a PhD in Automatique Produtique - Institut National Polytechnique de Grenoble (1994). He took postdocs at the Power Electronics Group at U. C. Berkeley (2002) and at the University of Toulouse, at the LAPLACE Laboratory (2015/16) with a CAPES grant. He is currently a professor at the Federal University of Minas Gerais, with experience in Electrical Engineering and emphasis on Electronic Process Control, Feedback. His activities involve induction motor, electric drives, energy minimization, non-linear control in power electronic converters with application in renewable energy sources and control of electronic ballasts. More recently, as a result of the 2015/16 post-doctorate, he has been working with multilevel converters, coordinating a CAPES-COFECUB cooperation project and supervising doctoral and master’s programs on the subject.

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