Development of applications of energy storage systems in modern distribution systems

Author(s)

Caio Oriente Pereira

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
• Defense date: 2022-05-26

Examining board members

Walmir de Freitas Filho; Jose Carlos de Melo Vieira Junior; Ahda Pionkoski Grilo Pavani; Madson Cortes de Almeida; Fernanda Caseño Trindade Arioli

• Advisor: Walmir de Freitas Filho

Abstract

nergy Storage Systems (ESSs) have been drawing great interest worldwide from all the agents involved in the electric sector as part of the effort to modernize distribution systems. In fact, globally, there is a strong trend to diversify the energy supply mix driven by (a) aim of decarbonization and (b) increasing demand for electricity. As a result, renewable energy sources, mainly solar and wind, have been explored as alternative for electricity generation. However, such sources are intermittent, which hampers a steady supply of energy as well as may cause Power Quality (PQ) issues. Under this scenario, the Energy Storage Systems stand out as an adequate technology that enables better use and integration of intermittent and renewable energy sources, mitigates their technical impacts, and improves PQ levels. More precisely, this context occurs in greater degree in Modern Distribution Systems (MDSs), in which photovoltaic generators, electric vehicles, metering and monitoring systems have been deployed at an accelerating pace. In this sense, this Ph.D. thesis developed and evaluated applications for ESSs in MDSs at three levels, to demonstrate their potential to benefit the grid: (i) small-scale – ESSs installed at MV networks consumers; (ii) medium-scale – ESSs connected to service transformers (MV/LV) and (iii) large-scale – ESSs integrated to distribution substations (HV/MV). The main applications, by level, are: (i) economic saving and payback according to tariff; (ii) loading reduction, energy balance and islanded operation in microgrid; (iii) backup and contribution to short-circuit currents. Besides, for any level, (iv) voltage control capacity by reactive power and (v) analysis of PQ impacts through field measurements. Real data from Brazilian networks combined with computational simulation and analytical studies were used to develop, evaluate, and improve these applications. Field measurements collected as part of a Brazilian R&D project were also considered during this Ph.D. research (AU)

• FAPESP's process: 16/23754-9 - Development of Applications for Electrical Energy Storage Systems in Modern Distribution Systems
• Grantee: Caio Oriente Pereira
• Support Opportunities: Scholarships in Brazil - Doctorate