An Optimal Energy Management Technique Using the epsilon-Constraint Method for Grid-Tied and Stand-Alone Battery-Based Microgrids

Author(s)

Agnoletto, Elian J. ^[1] ; De Castro, Daniel Silva ^[1] ; Neves, Rodolpho V. A. ^[2] ; Machado, Ricardo Quadros ^[1] ; Oliveira, Vilma A. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, BR-13566590 Sao Carlos - Brazil

^[2] Univ Fed Vicosa, Dept Elect Engn, BR-36570900 Vicosa, MG - Brazil

• Document type: Journal article
• Source: IEEE ACCESS; v. 7, p. 165928-165942, 2019.
• Web of Science Citations: 0

Abstract

The intermittent characteristics of microgrids (MGs) have motivated the development of energy management systems (EMSs) in order to optimize the use of distributed energy resources. In current studies, the implementation of an EMS followed by experimental-based analyses for both grid-tied and stand-alone MG operation modes is often neglected. Additionally, the design of a management strategy that is capable of preserving the storage device lifetime in battery-based MGs using a power gradient approach is hardly seen in the literature. In this context, this work presents the application of an EMS for battery-based MGs which is suitable for both grid-tied and stand-alone operation modes. The proposed EMS is formulated as an optimal power flow (OPF) problem using the epsilon-constraint method which is responsible for computing the current references used by the EMS to control the MG sources. In the optimization problem, the total generation cost is minimized such that the active power losses are kept within pre-established boundaries, and a battery management strategy based on power gradient limitation is included. Finally, the effectiveness of the proposed EMS is evaluated by two scenarios which enable detailed analyses and validation. The first considers a dispatchable and a non-dispatchable source, whereas the second a dispatchable source and a storage device. The experimental results showed that the proposed EMS is efficient in both operation modes and is also capable of smoothing the state of charge (SoC) behavior of the storage device. (AU)

• FAPESP's process: 16/25017-1 - Measurement-Based Control and Its Applications
• Grantee: Vilma Alves de Oliveira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50851-0 - INCT 2014: National Institute of Science and Technology for Cooperative Autonomous Systems Applied in Security and Environment
• Grantee: Marco Henrique Terra
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/20721-4 - Sistem for interconection of distributed generators to the grid: sintesis of micro grids
• Grantee: Ricardo Quadros Machado
• Support Opportunities: Regular Research Grants