Minimization of Circulating Currents in Parallel DC-DC Boost Converter Using Non-Linear Droop Control for Battery Energy Storage System

  • B. C. Chakrapani Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India
  • C. R. Arunkumar Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India
  • Punna Srinivas Electrical Engineering Department, BVRIT HYDERABAD College Engineering for Women, Hyderabad, Telangana-500090, India
  • Udaya Bhasker Manthati Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India
Keywords: Battery storage converter, Non-Linear Droop control, Circulating Current minimization, Converter redundancy

Abstract

Battery is considered the most dominant energy storage device for renewable energy-based DC microgrid systems (RE-DCMG) because of its ability to store energy for a longer duration. Here the power electronic converter plays a vital role, which acts as a bridge between the energy storage system and DC microgrid. One of the main reasons for the failure of battery systems due to the failure of the power electronic converters. To improve the redundancy and converter failure issues of battery energy storage systems (BESS), parallel operation of multiple converters are required. However, the parallel operation faces an issue of voltage imbalance between the converters which gives rise to an input circulating current. To address these issues, in this paper, we propose a nonlinear droop control based parallel DC-DC boost converter for battery energy storage system. The nonlinear droop control strategy ensures the equal battery current sharing between the parallel converters and good output voltage regulation. Moreover, SOC based controller avoids over-charging and over-discharging of the battery and the parallel converters ensure the redundancy in operation. The proposed system is designed and implemented in the MATLAB/Simulink and compared with the existing linear droop control.

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Author Biographies

B. C. Chakrapani, Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India

B. C. Chakrapani received his B.Tech. degree in Electrical and Electronics Engineering from Institute of Aeronautical Engineering, Dundigal, Hyderabad, India in 2016 and Master’s in Power Electronics and Drives from National Institute of Technology-Warangal, India in 2020, respectively. His research interest are energy storage systems, power electronic converters and applications.

C. R. Arunkumar, Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India

C. R. Arunkumar received B.Tech and M.Tech degree in Electrical and Electronics Engineering and Power Electronics and control from Mahatma Gandhi University Kottayam, Kerala in 2013 and 2016 respectively. He is presently working towards Doctoral Program from National Institute of Technology-Warangal, India. His research interests include DC microgrid, Hybrid Energy Storage systems and DC-DC converters.

Punna Srinivas, Electrical Engineering Department, BVRIT HYDERABAD College Engineering for Women, Hyderabad, Telangana-500090, India

Punna Srinivas received B.Tech degree in electrical and electronics engineering from JNTU, Hyderabad, India in 2006. The Masters (M.Tech) and Ph.D in Power Electronics and Drives from National Institute of Technology-Warangal, India in 2009 and 2021 respectively. Currently, he is working as Assistant Professor at BVRIT Hyderabad College of Engineering for Women, Hyderabad, India. His research interests include design and modeling of DC-DC converters for Energy storage systems, DC microgrid integrated hybrid energy storage system for linear and non-linear control technique.

Udaya Bhasker Manthati, Electrical Engineering Department, National Institute of Technology Warangal, Telangana-506004, India

Udaya Bhsaker Manthati received B.Tech degree in electrical and electronics engineering and M.E. in Power Electronics & Drives in 2003 and 2006 and Ph.D. in electrical engineering in 2011. Since 2012, he has been working as Assistant professor in department of electrical engineering at National Institute of Technology-Warangal, India. In 2011, he worked as Assistant professor at Manipal University Jaipur-India. He was a research assistant at CITCEA-UPC, Spain during 2007–2011. His research interest include bi-directional DC-DC converters, power electronics application to micro grid and smart grid technologies, energy storage systems, digital control and synchrotrons power supplies. He is a recipient of SLL-UPC fellowship during 2007–2010.

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Published
2022-02-22
Section
SPECIAL ISSUE: Energy Access & Off-Grid Systems for Residential Microgrids/Nanog