Parallel operation of portable solar-battery storage systems



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In the United States, severe weather conditions such as thunderstorms, hurricanes, and blizzards are the leading cause of power outages. These power outages have caused life-threatening situations in the recent past for some cities. Historically, during some natural disasters and emergencies, the primary electrical grid gets damaged or fails to provide electricity to the affected areas efficiently. Especially in remote areas, such effects become even worse. Hence, there is a need for a sustainable electricity generation method to conduct regular operations and human survival in some cases. Additionally, the stress caused on the environment due to traditional power generation methods, there is a need for a clean and green energy system. Solar energy is a highly researched energy system, and PV battery-based systems were used in past studies. However, the power output of one PV battery system is not enough to supply power to great critical electricity demand. Therefore, there is a need to increase the power output of the PV battery system. To fulfill these needs, the research question developed for this analysis was 'can multiple PV-battery systems operated in parallel and islanded mode provide sustainable and portable electricity to support critical electricity demands and supply energy to remote places?' To answer the research question, the objectives developed were (1) attaining the synchronization between the two PV-battery systems, (2) achieving voltage and frequency regulations, (3) establishing proportional real and reactive power sharing between PV-battery systems, and (4) achieving smooth operation in the islanded mode for multiple PV-battery systems. For this analysis, a portable PV-battery-based electricity generation system with six serial-connected 180W solar panels, a 2.1KWh battery pack, and a SYNDEM power converter is developed. Two PV-battery systems are operated in parallel using self-synchronized universal droop controller. Advanced power electronics control technologies are employed to achieve the autonomous operation of the PV battery systems. The incremental conductance-based Maximum power point tracking (MPPT) algorithm is used for harnessing maximum power from the PV panels. The result demonstrated that synchronization was achieved between the two systems. As a result, power output was maximized, and the system can support a load of 700W with only two systems in parallel. This project provides alternative solutions for community resiliency and energy independence. In remote monitoring applications, such as oil field monitoring systems, pipeline monitoring systems, communications, and critical electronic systems, also require continuous electricity supplies. This research provides a portable and sustainable electricity delivery system, a promising solution to address the above power demands.

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Self-Synchronization, Solar Energy, Power Electronics