Compensation of Oscillating Instantaneous Power in Modern Microgrids Based on the Conservative Power Theory

José de A. O. Filho; Helmo K. Morale- Paredes; Jakson P. Bonaldo; Augusto M. S. Alonso; Fernando P. Marafão; Marcelo G. Simões

doi:10.18618/REP.2020.3.0017

Authors

José de A. O. Filho Universidade de São Paulo - USP, Sorocaba – SP, Brazil
Helmo K. Morale- Paredes Universidade de São Paulo - USP, Sorocaba – SP, Brazil
Jakson P. Bonaldo Universidade Federal de Mato Grosso - UFMT, Cuiabá – MT, Brazil
Augusto M. S. Alonso Universidade de São Paulo - USP, Sorocaba – SP, Brazil
Fernando P. Marafão Universidade de São Paulo - USP, Sorocaba – SP, Brazil
Marcelo G. Simões Colorado School of Mines, Golden – CO, USA

DOI:

https://doi.org/10.18618/REP.2020.3.0017

Keywords:

Conservative Power Theory, Instantaneous Power Oscillations, Microgrid, Multifunctional Grid-Tied Inverters, Power Quality

Abstract

Considering the application of multi-functional grid-tied inverters in modern microgrids, this paper proposes a novel control strategy derived from the Conservative Power Theory (CPT), which makes possible the compensation of instantaneous power oscillations. Such approach is based on the instantaneous power and instantaneous reactive energy terms defined by the CPT, allowing the extraction of oscillating power components directly in the abc frame. Simulation results are presented to demonstrate the applicability of the control strategy considering the scenario of a weak microgrid with linear, non-linear, and unbalanced loads, as well as comprising a three-phase multi-functional grid-tied inverter with LCL filter. The results show that active power dispatchability can be offered by the inverter, while concomitantly supporting the microgrid to operate at constant instantaneous power. Experimental results comprising a 3.6 kVA inverter prototype also validate the proposed decomposition of oscillating power terms, showing that they can be satisfactorily employed on compensation purposes.

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Author Biographies

José de A. O. Filho, Universidade de São Paulo - USP, Sorocaba – SP, Brazil

received the B.S. degree in Electrical Engineering from the Federal University of Mato Grosso do Sul, Brazil, in 2017. He received the M.S. degree in Electrical Engineering from the São Paulo State University (UNESP/FEB), Brazil, in 2019. His main interests are power electronics and power quality.

Helmo K. Morale- Paredes, Universidade de São Paulo - USP, Sorocaba – SP, Brazil

received the B.S. degree from the San Agustin National University Arequipa, Peru, in 2002, and the M.Sc. and Ph.D. degrees from UNICAMP, Brazil, in 2006 and 2011, respectively, all in electrical engineering. In 2009, he joined the Power Electronics Group, University of Padova, Italy, as a Visiting Student. In 2014, he joined the PEMC Group, University of Nottingham, U.K., as a Visiting Scholar. In 2018, he joined the Colorado School of Mines, USA, as a Visiting Scholar. Since 2011, he has been with UNESP, as an Associated Professor and he is the Leader of the Group of Automation and Integrating Systems. His current research interests include power theories under nonsinusoidal condition, harmonics propagation, power quality, accountability, revenue metering, and power electronics applied for distributed generation and renewable energy systems.

Dr. Morales-Paredes was a recipient of a Prize Paper Award from the IEEE TRANSACTIONS ON POWER ELECTRONICS in 2011 and currently he is an Associate Editor for the IEEE Latin America Transactions. He is a member of SOBRAEP, SBA and IEEE

Jakson P. Bonaldo, Universidade Federal de Mato Grosso - UFMT, Cuiabá – MT, Brazil

received the B.S. degree in electrical engineering from Federal University of Mato Grosso, Cuiaba, in 2008, and M.S. and Ph.D. degrees in electrical engineering from the University of Campinas, Campinas, Brazil, in 2010 and 2015, respectively. From 2010 to 2011 he was with Padtec Optical Components and Systems as a firmware engineer. From 2013 to 2018 he was with the Department of Electronics at Federal University of Technology – Parana. Since 2018 he is with the Department of Electrical Engineering at Federal University of Mato Grosso as assistant professor. His main interests are power quality, smart microgrid and renewable energy. He is member of SOBRAEP.

Augusto M. S. Alonso, Universidade de São Paulo - USP, Sorocaba – SP, Brazil

received the B.S. degree in automation and control engineering from the Federal University of Ouro Preto, in 2014, with a sandwich period at the University of New Mexico, USA, between 2012-2013. He received the M.S. degree in electrical engineering from the São Paulo State University (UNESP), Brazil, in 2018. Currently, he is a FAPESP scholar working toward a double Ph.D. degree at UNESP and at the Norwegian University of Science and Technology, Norway. In 2019, he was a recipient of the SOBRAEP award for the best M.S. thesis of the year. His main interests are control of power converters, microgrid control, power quality, and energy policies.

Fernando P. Marafão, Universidade de São Paulo - USP, Sorocaba – SP, Brazil

received the B.S. degree in electrical engineering from UNESP, Brazil, in 1998, and the M.Sc. and Ph.D. degrees from UNICAMP, Brazil, in 2000 and 2004, respectively. In 2002, he joined the Power Electronics Group, University of Padova, Italy, as a visiting student. In 2013, he joined the Colorado School of Mines, USA, as a Visiting Scholar. Since 2005, he has been with UNESP, as an Associate Professor with the Group of Automation and Integrating Systems. His current research interests include smart grid technologies, distributed generation, energy management, power electronics and power theories. He is a member of SOBRAEP, SBA and IEEE.

Marcelo G. Simões, Colorado School of Mines, Golden – CO, USA

received the B.Sc. and M.Sc. degrees from USP, Brazil, the Ph.D. degree from The University of Tennessee, USA, in 1985, 1990 and 1995, respectively. He was a US Fulbright Fellow for AY 2014–15, Aalborg University, Denmark. He is a pioneer to apply neural networks and fuzzy logic in power electronics, motor drives, and renewable energy systems. His leadership in modeling fuel cells is internationally and highly influential in providing a basis for further developments in fuel cell automation control in many engineering applications. Dr. Simões was a recipient of the "2018 IET Renewable Power Generation Premium Award." He is an IEEE Fellow, Class of 2016, with the citation: "for applications of artificial intelligence in control of power electronics systems." He is currently serving as the Chair for the IEEE Industrial Electronics Society Denver Chapter.

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