Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Rajkumar, K.

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    Performance Investigation of Transformerless DVR Based on T-type Multilevel Inverter with Reduced Switch Count
    (Institute of Electrical and Electronics Engineers Inc., 2019) Rajkumar, K.; Parthiban, P.
    Voltage sag is typically the most severe power quality problem in power systems. Dynamic voltage restorers (DVR) are recognized to be a cost-effective solution for protection of sensitive loads from the power quality problems. Continuation of cost reduction, reliability and efficiency can be achieved by eliminating the injection transformer. This paper explains transformerless DVR based on a T-type multilevel inverter. The proposed DVR will not have an injection transformer which leads to less cost, less weight, and small size. The controller of the DVR is implemented by d-q transformation. The simulation results of dynamic voltage restorer are generated by MATLAB/SIMULINK software. © 2019 IEEE.
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    Grid voltage detection method based on a novel adaptive notch filter for control of transformerless dynamic voltage restorer
    (Institute of Electrical and Electronics Engineers Inc., 2020) Rajkumar, K.; Parthiban, P.
    In the near future, the power system network may experience severe voltage distortions due to evolving concepts of microgrid, and the large penetration of power electronic based loads into a conventional grid. To protect sensitive loads from voltage disturbances under such severe grid conditions, the commonly used dynamic voltage restorer (DVR) requires control algorithms. Therefore, in this paper, widely used PI control strategy for transformerless single phase dynamic voltage restorer (DVR), based on a T-type multilevel inverter(MLI) is presented. In addition, the novel adaptive notch filter (NANF) is used for accurate extraction of DVR reference voltage for highly distorted grid conditions. Unlike conventional filters, NANF does not require phase-lock loop (PLL) or frequency-lock loop (FLL) for grid phase angle or frequency extraction. The performance of the system with the control algorithm is studied in MATLAB/Simulink to evaluate various power quality problems such as voltage sag, voltage swell, and harmonics. © 2020 IEEE.
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    Design, and Hardware Implementation of Semi-Z-Source Inverter based Transformer-less Dynamic Voltage Restorer
    (Institute of Electrical and Electronics Engineers Inc., 2023) Remya, V.K.; Parthiban, P.; Nandakumar, A.; Ansal, V.; Rajkumar, K.
    In this paper, design, and implementation of a semi-Z-source inverter based topology of Dynamic Voltage Restorer (DVR) is discussed. The topology utilizes the semi-Z-source buck inverter to synthesize the missing voltage for load compensation during power quality (PQ) events. The absence of filter components, elimination of shoot-through phenomenon, reduced size and cost of the SZS inverter are some of the attributes of the proposed DVR topology. The design and the hardware implementation of the laboratory prototype of the semi-Z-source inverter based DVR is elaborated in this paper. © 2023 IEEE.