Enhancing Efficiency in Residential PV Systems: Novel Maximum Power Point Tracking Strategy for Reduced DC Bus Capacitance in Differential Power Processing Architecture
Date
2024-07-11
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Abstract
Tracking efficiency, cost, and reliability are important factors when selecting PV architectures and converter topologies. PV systems require power converters to maximize power extraction, for which DC-DC converters are a common choice. Differential Power Processing (DPP) architectures can achieve higher efficiencies and lower cost by reducing the amount of power passing through these converters, while still providing Maximum Power Point Tracking (MPPT) capabilities. Single-phase grid connected PV systems, which are the most popular choice in residential applications, require a large capacitance in the DC bus to minimize the voltage ripple caused by double-line pulsating power, which has impacts on the cost and reliability of the system. This work introduces a new MPPT mode of operation for flyback converters in DPP architectures. The proposed MPPT method shows extremely fast dynamic performance and is capable of maximizing power extraction, even for extreme variations in the bus voltage. In this way, the proposed method enables a significant reduction in the DC bus capacitance, which contributes to reducing costs and facilitating the use of ceramic capacitors, while maintaining excellent tracking efficiency. The analysis incorporates comprehensive models that characterize the large-signal dynamic behaviour of ideal and non-ideal flyback converters, and it is supported by detailed mathematical procedures. The system performance behaviour and limits are validated through simulation and experimental results.
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Keywords
Maximum Power Point Tracking, MPPT, Differential Power Processing, DPP, Flyback Converter, Incremental Conductance, Reduced Bus Capacitance, Efficiency, Residential PV systems
Citation
Aguero Meineri, A. N. (2024). Enhancing efficiency in residential PV systems: novel maximum power point tracking strategy for reduced DC bus capacitance in differential power processing architecture (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.