Hybrid PV-Battery Pumping System Based on Quasi Z Source Boost and Bidirectional DC-DC Converters

In this work, a hybrid PV-battery pumping system based on quasi Z source boost and bidirectional DC-DC converters is presented. To resolve the problem of low voltage produced by many renewable energy sources, the addition of a reliable power electronics interface is inevitable. For that, two innovative quasi Z source DC-DC converters are integrated. The first is associated to the PV panels to elevate the produced voltage and follows the maximum power point tracking MPPT. The second one is connected to the battery storage system to ensure the charge and discharge of the batteries. The objective of this present study is the control of hybrid PV-battery pumping system with quasi Z source DC-DC converters. For that, the system is modeled and controlled by Perturb and Observe MPPT algorithm to generate the duty cycle of the quasi Z source boost DC-DC converter and by regulating the DC output voltage (DC pump) of the quasi Z source bidirectional DC-DC converter. The results obtained in MATLAB/Simulink environment show clearly the viability, performance, and the robustness of the system and its control strategy.