A Grid Connected Photovoltaic Inverter with Battery-Supercapacitor Hybrid Energy Storage
Víctor Manuel Miñambres-Marcos1, Miguel Ángel Guerrero-Martínez2, Fermín Barrero-González3
1Power Electrical and Electronic Systems Research Group, Escuela de Ingenierías Industriales, Universidad de Extremadura, Avda. de Elvas, s/n, 06006 Badajoz, Spain. vminmar@unex.es.
Sensors (Basel, Switzerland)
|August 12, 2017
Summary
This study introduces a hybrid energy storage system combining batteries and supercapacitors for renewable power sources. The new control scheme enhances battery lifespan and ensures stable power delivery from photovoltaic systems.
Area of Science:
- Renewable Energy Systems
- Energy Storage Technologies
- Power Electronics
Background:
- Renewable energy sources like solar power exhibit inherent variability and fluctuations.
- Energy storage systems (ESS) mitigate these fluctuations but face challenges with battery cost and limited lifespan.
- Existing research on hybrid ESS often overlooks specific applications in residential and large-scale photovoltaic (PV) systems.
Purpose of the Study:
- To propose a novel combined topology and control scheme for managing power sharing between batteries and supercapacitors in PV systems.
- To introduce a method for sizing hybrid ESS and distribution networks based on PV power generation curves.
- To enhance the lifespan of batteries and ensure consistent power output from PV installations.
Main Methods:
- Development of a selected hybrid topology integrating batteries and supercapacitors.
- Design of a new control scheme for optimized power sharing between storage components.
- Implementation of a sizing methodology for ESS and hybrid distribution networks tailored to PV power profiles.
- Validation through detailed simulations and experimental testing.
Main Results:
- Reduced stress on batteries, leading to an extended lifespan.
- Consistent power injection into the grid over specified time intervals.
- Effective power management between batteries and supercapacitors in PV systems.
- Validated performance of the proposed scheme via simulations and experiments.
Conclusions:
- The proposed hybrid ESS with a new control scheme effectively addresses the limitations of standalone battery storage for PV systems.
- The innovative sizing method optimizes ESS and distribution network design for enhanced performance and longevity.
- This approach significantly improves the reliability and efficiency of renewable energy integration.
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