Performance Improvement of Standalone Solar PV Pumping System Using Supercapacitor

Engineering notes

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Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

Water scarcity and unreliable grid electricity are two of the most pressing challenges facing rural communities in arid and semi arid regions. Stand alone solar photovoltaic (PV) pumping systems have emerged as a clean, low maintenance alternative to diesel powered pumps, yet their performance is constrained by the intermittent nature of sunlight and the limited energy buffering capacity of conventional batteries. This study investigates the integration of a high power, high energy density super capacitor bank as a hybrid storage element in a 5 kW PV driven water pumping installation. A comprehensive modeling framework was developed in MATLAB/Simulink that couples a detailed PV array model, a variable speed centrifugal pump, a maximum power point tracking (MPPT) controller, and a dual storage management algorithm capable of dynamically allocating power between the super capacitor and a modest Li ion battery pack. Field trials were conducted over a six month period in a remote agricultural site in the Sahel, with real time monitoring of solar irradiance, pump flow rate, system efficiency, and state of charge of both storage devices. Key findings demonstrate that the super capacitor module mitigates the short duration power dips caused by passing clouds, delivering a 22 % increase in average pump flow (from 3.1 m³ h⁻¹ to 3.8 m³ h⁻¹) and a 17 % reduction in the depth of discharge cycles imposed on the Li ion battery, effectively extending its service life by an estimated 40 %. Also the results demonstrates that, average pump flow in Sunny days is 99%, in cloudy days is 88% and in partially cloudy days it 83% of its rated flow. The results substantiate the premise that super capacitors, when judiciously orchestrated with conventional batteries, can substantially uplift the reliability, efficiency, and economic viability of off grid solar water pumping solutions.

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