http://localhost:8080/xmlui/handle/123456789/214 Sun, 26 Apr 2026 02:01:21 GMT 2026-04-26T02:01:21Z http://localhost:8080/xmlui/handle/123456789/3902 Title: An SVPWM Scheme for the Suppression of Zero-Sequence Current in a Four-Level Open-End Winding Induction Motor Drive With Nested Rectifier-Inverter Authors: Reddy, B. Venugopal; Somasekhar, V.T. Abstract: A four-level open-end winding induction motor (OEWIM) drive is known to suffer from two perennial problems. One is the problem of zero-sequence current in the motor phases, which is causedbytheexistence of zero sequence voltage in them. The other is the overcharging of the dc-link capacitor of the inverter operated with lower dc-link voltage by its counterpart operated with a higher dc-link voltage. This paper investigates the applicability of a special variant of space vector pulse width modulation (SVPWM) scheme for a recently proposed power circuit configuration, in which a rectifier–inverter combination is nested within the conventional two-level inverter configu ration to achieve four-level inversion. This PWM scheme is named as the sample-averaged zero-sequence elimina tion (SAZE) SVPWM scheme, wherein the zero sequence voltage is suppressed in each sampling time period in the average sense. Both of the aforementioned problems encountered in this drive are successfully overcome for this power circuit configuration by resorting to the pro posed SVPWM strategy Description: NITW Fri, 01 Jan 2016 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3902 2016-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3901 Title: A solar PV water pumping solution using a three-level cascaded inverter connected induction motor drive Authors: Ramulu, Chinthamalla; Sanjeevikumar, Padmanaban; Karampuri, Ramsha; Jain, Sachin; Ertas, Ahmet H.; Fedak, Viliam Abstract: 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 condi tions. This helps in improving the THD of IM phase current, thereby reducing the torque ripple. In addi tion, 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 sim ulation 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. Description: NITW Fri, 01 Jan 2016 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3901 2016-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3900 Title: Dual MPPT algorithm for dual PV source fed Open-End Winding Induction Motor Drive for pumping application Authors: Jain, Sachin; Ramulu, Chinthamalla; Padmanaban, Sanjeevikumar; Ojo, Joseph Olorunfemi; Ertas, Ahmet H. Abstract: 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 algo rithm operate the two PV sources at or near maximum power point (MPP) irrespective of its configura tion. 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 oper ated using decoupled Pulse Width Modulation (PWM) technique with V/f control along with the proposed dual MPPTtechnique. The maximumpowerextracted bythedual MPPT algorithm fromtwoPVsources is optimally utilized by the OEWIM. This can be supported by the low slip value at all the operating condi tions. The detailed analysis of proposed system and the simulation results are presented Description: NITW Fri, 01 Jan 2016 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3900 2016-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3899 Title: Bat algorithm and firefly algorithm for improving dynamic stability of power systems using UPFC Authors: Vijay Kumar, B.; Srikanth, N.V. Abstract: In this paper a hybrid method for improving the dynamic stability of the power system using UPFC is proposed. The novelty of the proposed method is combined performance of the Bat-inspired algorithm and Firefly Algorithm (FA), which provides improved searching ability, automatic subdivision and random reduction. Here, the bat-inspired algorithm optimizes the maximum power loss bus while the generator fault occurs, which inturn affects the power flow constraints like voltage, power loss, real and reactive power. For improving the dynamic performance, the optimum capacity of UPFC has been determined with minimum cost by using the FA algorithm. The attained capacity UPFC has been located in the affected location and analyzes the power flow of the system. The proposed method is implemented in the MATLAB/simulink platform with IEEE 30 and IEEE 14 standard bench mark system. The proposed method performance is evaluated by comparison with different techniques like hybridized Gravitational Search Algorithm (GSA) and Bat algorithm. The comparison results proved the effectiveness of the proposed method and confirm its potential to solve the problem. Description: NITW Fri, 01 Jan 2016 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3899 2016-01-01T00:00:00Z