Comparison of Different Energy Storage Techniques Integration into Grid-Connected PV System for Green RMG Factory

Nowadays the Readymade Garments (RMG) sector is facing significant pressure to adopt sustainable energy solutions. The most suitable option for RMG owners to introduce renewable energy is the rooftop solar PV systems. However, the average sunlight (required for solar power generation) hours in a day is generally less than the average working hours of a typical RMG factory. Therefore, energy storage systems integrated with solar PV systems can ensure a sustainable, green, and efficient power supply during grid disruption, cloudy days, or even when there is not enough PV power output. In addition, energy storage can work as a backup power supply by replacing diesel generators and overall carbon emissions can be reduced. This paper aims to compare the techno-economic and environmental assessment of three different energy storage techniques integrated into grid-connected solar PV systems for a small RMG factory. Three distinct types of energy storage technologies are- lead-acid batteries, lithium-ion batteries, and supercapacitors. The Net Present Cost (NPC), Cost of Energy (COE), and Renewable Fraction (RF) are the main comparative indicators for this study. The comparative analysis shows that the PV-Grid system with Li-ion battery achieves the lowest COE and NPC compared to other storage-connected systems. From an environmental point of view, the renewable fraction for all three storage integrated systems can be around 40% which can reduce a huge amount of CO
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