Energy Balancing Capability of a Three Phase Nine-Level Inverter for Solar Water Pumping Applications

Abstract

As agriculture is one of the highly respected and valued sectors of the economy of India, its level of water consumption pumped to eighty-five percent with respect to its resources. However, this factor brings us to an efficient way of energy usage. The present work is an effective presentation of the water pumping scenario with a specific eye on solar pumping application. Long lasting trait of a solar appliance and its low cost for maintenance makes it a great solution for the existing demand. Multilevel inverters have proved to be viable solutions with their reduced dv/dt stress of devices, better output quality, and minimal filter requirement. Quantity of voltage levels is directly proportional to the control complexity and device count for any conventional multilevel inverter. There is also a possibility of energy unbalance issue which obviously will affect the reliability of the system. Here, in this paper, an efficient model of a solar based water pumping system with energy balancing capability is proposed which can act as a effective replacement for the existing systems. A 3-$\Phi$ nine-level inverter topology is now proposed in this paper with the issues addressed there by having a minimal device count and maximum reliability factor. 4-Isolated DC sources with magnitudes of Vdc/4 (where Vdc is the voltage requirement for the conventional NPC multilevel inverter), constitute the PV sources. Energy balancing capability during the partial shading of PV panels is specifically worked out in the proposed topology. The mathematical analysis of energy balancing between the DC sources is also presented in this paper. Using MATLAB/Simulink the energy balancing issue is analyzed in this paper.