Partial State-of-Charge Mitigation in Standalone Photovoltaic Hybrid Storage Systems

Iván Sanz-Gorrachategui, Carlos Bernal Ruiz, Estanis Oyarbide Usabiaga, Antonio Bono Nuez, Sergio Jesús Artal Sevil, Erik Garayalde Pérez, Iosu Aizpuru Larrañaga and Jose María Canales Segade
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Iván Sanz-Gorrachategui: Departamento de Ingenierı́a Electrónica y Comunicaciones, Universidad de Zaragoza, C/Marı́a de Luna 1, 50018 Zaragoza, Spain
Carlos Bernal Ruiz: Departamento de Ingenierı́a Electrónica y Comunicaciones, Universidad de Zaragoza, C/Marı́a de Luna 1, 50018 Zaragoza, Spain
Estanis Oyarbide Usabiaga: Departamento de Ingenierı́a Electrónica y Comunicaciones, Universidad de Zaragoza, C/Marı́a de Luna 1, 50018 Zaragoza, Spain
Antonio Bono Nuez: Departamento de Ingenierı́a Electrónica y Comunicaciones, Universidad de Zaragoza, C/Marı́a de Luna 1, 50018 Zaragoza, Spain
Sergio Jesús Artal Sevil: Departamento de Ingenierı́a Electrónica y Comunicaciones, Universidad de Zaragoza, C/Marı́a de Luna 1, 50018 Zaragoza, Spain
Erik Garayalde Pérez: Departamento de Electrónica, Mondragon Universitatea, C/Loramendi 4, 20500 Arrasate-Mondragon, Gipuzkoa, Spain
Iosu Aizpuru Larrañaga: Departamento de Electrónica, Mondragon Universitatea, C/Loramendi 4, 20500 Arrasate-Mondragon, Gipuzkoa, Spain
Jose María Canales Segade: Departamento de Electrónica, Mondragon Universitatea, C/Loramendi 4, 20500 Arrasate-Mondragon, Gipuzkoa, Spain

Energies, 2019, vol. 12, issue 22, 1-20

Abstract: Energy Storage in photovoltaic installations has increased in popularity in recent years due to the improvement in solar panel technology and energy storage systems. In several places where the grid is not available, in remote isolated rural locations or developing countries, isolated photovoltaic installations are one of the main options to power DC micro-grids. In these scenarios, energy storage elements are mandatory due to the natural day-night cycles and low irradiation periods. Traditionally, lead-acid batteries have been responsible for this task, due to their availability and low cost. However, the intermittent features of the solar irradiance patterns and load demand, generate multiple shallow charge–discharge cycles or high power pulses, which worsen the performance of these batteries. Some Hybrid Energy Storage Systems (HESSs) have been reported in the literature to enhance the lifetime and power capabilities of these storage elements, but they are not intended to overcome the Partial State of Charge (PSoC) issue caused by daily cycles, which has an effect on the short and mid-term performance of the system. This paper studies the impact of the already proposed HESSs on PSoC operation, establishing the optimal hybrid ratios, and implementing them in a real installation with a satisfactory outcome.

Keywords: Energy Storage Systems; Standalone Photovoltaic Systems; Hybrid Energy Storage Systems; LiFePO 4 batteries; Lead Acid batteries (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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