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    Dual MPPT algorithm for dual PV source fed Open-End Winding Induction Motor Drive for pumping application
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2016) Jain, Sachin; Ramulu, Chinthamalla; Padmanaban, Sanjeevikumar; Ojo, Joseph Olorunfemi; Ertas, Ahmet H.
    This paper presents a single-stage solution for a dual Maximum Power Point Tracking (MPPT) technique for a solar Photovoltaic (PV) fed water pumping system. The proposed solar PV fed pumping system uses a three-phase Open-End Winding Induction Motor (OEWIM) coupled to a centrifugal water pump. The OEWIM is connected via two time tested two-level three-phase inverters powered by two independent solar PV arrays. These two PV arrays can be configured independently and the employed dual MPPT algorithm operate the two PV sources at or near maximum power point (MPP) irrespective of its configuration. Usage of different array configurations may help in attaining more number of levels (greater than or equals to three) in the inverter output voltage (OEWIM phase voltage). Furthermore, the system is operated using decoupled Pulse Width Modulation (PWM) technique with V/f control along with the proposed dual MPPT technique. The maximum power extracted by the dual MPPT algorithm from two PV sources is optimally utilized by the OEWIM. This can be supported by the low slip value at all the operating conditions. The detailed analysis of proposed system and the simulation results are presented. (C) 2016 Karabuk University. Publishing services by Elsevier B.V.
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    A solar PV water pumping solution using a three-level cascaded inverter connected induction motor drive
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2016) Chinthamalla, Ramulu; Padmanaban, Sanjeevikumar; Karampuri, Ramsha; Jain, Sachin; Ertas, Ahmet H.; Fedak, Viliam
    This paper presents a single-stage solution for PV fed three-phase induction motor (IM) water pumping system. The given solution uses time tested, two two-level cascaded H-bridge inverters to give three-level voltage output to the IM pump drive. The proposed system is operated using the control strategy which includes Maximum Power Point Tracking (MPPT), Space Vector Pulse Width Modulation (SVPWM) and V/f control. The MPPT algorithm generates the modulation index 'ma' which is used to operate the cascaded inverter and generates three-level output voltage under all environmental conditions. This helps in improving the THD of IM phase current, thereby reducing the torque ripple. In addition, the 'ma' value is used to define the IM operating frequency. This helps in further improvement in the IM performance. All the details of the proposed system regarding the system modeling along with simulation and experiment results are given in the manuscript. In addition, the comparison of the propsoed solution with the conventional system i.e., two-level inverter connected PV pumping system is presented. (C) 2016 Karabuk University. Publishing services by Elsevier B.V.