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    Analysis of enhancement in available power transfer capacity by STATCOM integrated SMES by numerical simulation studies
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2016) Ananthavel, Saraswathi; Padmanaban, Sanjeevikumar; Shanmugham, Sutha; Blaabjerg, Frede; Ertas, Ahmet H.; Fedak, Viliam
    Power system researches are mainly focused in enhancing the available power capacities of the existing transmission lines. But still, no prominent solutions have been made due to several factors that affect the transmission lines which include the length, aging of the cables and losses on generation, transmission and distribution etc. This paper exploited the integration of static synchronous compensator (STATCOM) and superconducting magnetic energy storage (SMES) which is then connected to existing power transmission line for enhancing the available power transfer capacity (ATC). STATCOM is power electronic voltage source converter (VSC) which is connected to the transmission system for shunt reactive power and harmonics compensation. SMES is a renowned clean energy storage technology. Feasibility of the proposed power system can control the real as well as reactive power flow independently between the transmission lines and STATCOM-(SMES) units. Complete proposed power system is implemented in numerical simulation software (Matlab/Simulink) and its performance is validated based on obtained investigation results. (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.
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    Transfer Function Modeling of Parallel Connected Two Three-Phase Induction Motor Implementation Using LabView Platform
    (Ieee, 2015) Gunabalan, R.; Sanjeevikumar, P.; Blaabjerg, Frede; Wheeler, Patrick W.; Fedak, Viliam; Ertas, Ahmet H.
    This paper presents the transfer function modeling and stability analysis of two induction motors of same ratings and parameters connected in parallel. The induction motors are controlled by a single inverter and the entire drive system is modeled using transfer function in LabView. Further, the software is used to perform the stability analysis of the parallel connected induction motor drive under unbalanced load conditions. It is very simple compared with the methods discussed so far to study the performance of the drive under unbalanced load conditions. Control design and simulation toolkits are used to model the drive system and to study the stability analysis. Simulation is done for various operating conditions and the stability investigation is performed for different load conditions and difference in stator and rotor resistances among the two motors.