Abstract
Photovoltaic (PV) water pumping systems convert solar radiation into electricity via PV panels to feed and drive electric pumps. The electrical energy is produced in DC form and must be adopted and then converted into alternating current by employing inverters. Batteries are used to store energy and to improve the system performance. Solar battery-assisted water pumping technology is on the long-run cost-effective and sure environment friendly. PV must be controlled to achieve the maximum power point operating condition. The state of charge of the battery should be observed to guarantee a safe and long battery working hours. In this chapter, a simple and efficient off-grid battery-assisted quasi Z-source inverter (QZSI) was developed in a PV-pumping system as a replacement to the traditional two-stage converter (boost converter + voltage source inverter). Analysis and mathematical model of QZSI has been presented. MPPT from the solar panels and the battery state of charge (SOC) are to be considered in determining controller’s parameters. The controller produces the shoot through duty ratio (D) and modulation index of the inverter (M). The inverter switching pattern is prepared based on the simple boost modulation technique. The performance of the system under study is verified via MATLAB/Simulink simulation.