Conference Papers

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

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

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    Simulation of four quadrant operation & speed control of BLDC MOTOR on MATLAB / SIMULINK
    (2008) Vinatha Urundady, U.; Pola, S.; Vittal, K.
    BLDC motors have been gaining attention from various Industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor drive system along with control system for speed and current has been presented using MATLAB / SIMULINK. In order to evaluate the model, various cases of simulation studies are carried out. Test results thus obtained show that, the model performance is satisfactory.
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    On line fault detection and an adaptive algorithm to fast distance relaying
    (2008) Srivani Iyengar, S.G.; Vittal, K.
    This paper presents the design of an hybrid scheme of wavelet transforms and an adaptive Fourier filtering technique for on line fault detection and phasor estimation to fast distance protection of transmission lines. The wavelet transform is used as a signal processing tool. The sampled voltage and current signals at the relay location are decomposed using wavelet transform- Multi Resolution Analysis (MRA). The decomposed signals are used for the fault detection and as input to the phasor estimation algorithm. The phasor estimation algorithm possesses the advantage of recursive computing and a decaying dc offset component is removed from fault signals by using an adaptive compensation method. Fault detection index and a variable data window scheme are embedded in the algorithm. The proposed scheme provides capability for fast tripping decision, taking accuracy into account. Extensive simulation tests and comparative evaluation presented prove the efficacy of the proposed scheme in distance protection. © 2008 IEEE.
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    A heuristic approach for distributed generation sources location and capacity evaluation in distribution systems
    (2008) Sharma, K.M.; Vittal, K.; Seshagiri, P.
    Distributed Generation (DG) sources are becoming more prominent in distribution systems due to increased demand for the electrical energy. The locations and capacities of DG sources will have an impact on system losses, voltage profile characteristics of distribution network. This paper presents a heuristic approach for selection of optimal location and determination of optimal capacity of DG sources. The technique adopts Genetic Algorithms and Optimal Power Flow to facilitate the decision making process. The developed technique is incorporated with the flexibility so that the network planner can choose the total number of DGs to be included, their constraints on maximum power outputs, non-feasible locations for DG insertion which are to be excluded from search. The proposed approach is tested for IEEE 69 bus system and the results have indicated the versatility of the technique.