A New Configuration for Wind/Solar Water Pumping System Based on a Doubly Fed Induction Generator

This paper proposes a new configuration for a standalone hybrid water pumping system that consists of a small-scale variable-speed wind turbine, a doubly-fed induction generator (DFIG), a battery storage system, a PV array, a boost converter, and a centrifugal water pump driven by a squirrel cage induction motor. The DFIG is connected to an inverter to extract maximum power under variable wind speed conditions. This inverter is also responsible for stalling the turbine when operating above rated wind speed. A PV array is used to charge the battery and the P&O technique is implemented for MPPT since the PV cells have nonlinear P-V characteristics. In this work, a comprehensive model that considers the mechanical, electrical and aerodynamic characteristics of a wind turbine system is used to model the new water pumping system configuration. The paper discusses the proposed configuration along with its control strategy and modeling, and presents simulation results that confirm its feasibility.