Control of PV-Battery Based Hybrid Water Pumping System Under Sudden Irradiance and Speed Changes

Abstract

This contribution presents the control of a hybrid water pumping system powered by a photovoltaic (PV) power source and a battery. This system comprises an induction motor (IM) and three static converters, including a boost converter, a bidirectional (BDC) buck-boost converter and a voltage source inverter (VSI). A maximum power point tracking (MPPT) controller based on a fuzzy logic controller (FLC) is designed to generate a variable step size reference current. Moreover, a sliding surface based on the current state variable is designed to force the boost inductor current to follow the reference current previously provided by the MPPT. The working principle of the bidirectional buck-boost converter is examined. Furthermore, two closed-loop proportional-integral (PI) controllers are designed for the power flow management between the DC-bus and the battery. Finally, the control scheme based on input-output linearization (IOL) is employed to control the induction motor. In order to assess the performances of the controlled three-stage hybrid water pumping system, a simulation is carried out using MATLABISimulink software, and the performances of the system are evaluated under sudden irradiance and speed changes.