Browsing by Author "Nisha, K C R"

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    PV Powered Performance enhanced three-stage cascaded quasi Z-source inverter fed induction motor drive
    (2015-03-23T05:54:14Z) Nisha, K C R; Sanjay, Jain
    This paper proposes the use of performance enhanced multi-stage Cascaded quasi Z-source Inverter (CqZSI) topology for adjustable speed drives in Photo Voltaic (PV) applications. For the same boost factor, a new PV powered three-stage CqZSI system has an advantage of lesser shoot-through duty ratio compared to the disadvantage of traditional ZSI with very less boost ratio, increased shoot-through ratio and high component stress at the power switches. A 25% reduction in shoot-through duty cycle is achieved by using the three-stage cascaded solution. The boost factor of the proposed system is 1.5 times higher than single-stage system for the same input voltage. Simulation of the three-stage CqZSI fed induction motor drive is done and verified by experimental results. The performance of the cascaded three-stage qZSI system is compared based on efficiency boost factor and shoot-through performance. This paper illustrates that the performance enhanced CqZSI topology is a good alternative topology for efficient and highly reliable PV power generation system.
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    PV Powered Performance Enhanced Three-stage Cascaded quasi Z-source Inverter fed Induction Motor Drive
    (2015-09-03T10:00:48Z) Nisha, K C R; Sanjay, Jain
    This paper proposes the use of performance enhanced multi-stage Cascaded quasi Z-source Inverter (CqZSI) topology for adjustable speed drives in Photo Voltaic (PV) applications. For the same boost factor, a new PV powered three-stage CqZSI system has an advantage of lesser shoot-through duty ratio compared to the disadvantage of traditional ZSI with very less boost ratio, increased shoot-through ratio and high component stress at the power switches. A 25% reduction in shoot-through duty cycle is achieved by using the three-stage cascaded solution. The boost factor of the proposed system is 1.5 times higher than single-stage system for the same input voltage. Simulation of the three-stage CqZSI fed induction motor drive is done and verified by experimental results. The performance of the cascaded three-stage qZSI system is compared based on efficiency boost factor and shoot through performance. This paper illustrates that the performance enhanced CqZSI topology is a good alternative topology for efficient and highly reliable PV power generation system.
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    PV Powered Switched-Inductor Embedded DC-link Impedance-source Inverter System
    (2015-06-19T05:16:51Z) Nisha, K C R; Dharmambal, V; Sanjay, Jain
    Background: The traditional embedded impedance-source inverter topology exhibits the disadvantages of low boost factor and higher cost due to additional PV sources. Objective: This research paper deals with the performance improvisation of embedded impedance-source inverter topology called Switched-Inductor DC-link Embedded Zsource Inverter (SL-DC-link EZSI). Switched inductor concept is employed to the reduced source DC-link EZSI to achieve the strong boosting ability in terms of short shoot-through period. Results: Simulation of PV powered SL-DC-EZSI fed induction motor drive is performed. The operating principle and the topological analysis are given. Boost factor performance, capacitor voltage and DC-link voltages as a function of shoot-through ratio of the SL-EZSI system is compared with the proposed SL-DClink EZSI system and the results are presented. Conclusion: PV powered Switched inductor DC-link EZSI topology is proposed and the results are presented. The propounded topology has the characteristics of high boost ratio, minimum shoot through period, reduced voltage stress and low cost.
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    Solar Powered Switched-Capacitor Reduced-source DC-link Impedance-source Inverter System
    (2015-09-03T09:52:57Z) Nisha, K C R; Sanjay, Jain
    The current fed impedance source inverter that was proposed earlier exhibits the same features of buck-boost inverter in a single stage. These Z-source inverters are more sturdy and reliable as they are vulnerable to electromagnetic noises. But the boosting gain of classical impedance source inverters is compromised by low modulation index and high component stress across the devices. To overcome these limitations of current fed impedance source inverter, this paper deals with a high performance switched capacitor reduced source DC-link Z-source. This utilizes the switched capacitor concept to the reduced source DC-link EZSI to achieve the strong boosting ability in short open-circuit period. Simulation of solar powered SC-DC-link EZ-source CSI system is performed. The proposed current-fed impedance-source topology has high boost ratio with less voltage stress than the classical current-fed inverters. The operating principle and the topological analysis are given. Boost factor performance and inductor current as a function of open-circuit ratio of the proposed SC-DC-EZSI system is compared with SC-EZSI system and the results are presented.