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Articles by S.U. Prabha
Total Records ( 4 ) for S.U. Prabha
  S.U. Prabha , B.S. Dayasagar and C. Venkataseshaiah
  A morphological decimation technique has been proposed and implemented to analyze the available power transfer capability in a transmission power network. The method creates a graphical image of the power network with thickness of the lines proportional to their respective rated megavolt ampere (MVA) capacity. Based on ac load flow solution, another image was created to represent the power flow in Megawatt (MW) between the buses. Proper scaling procedure has been discussed for the construction of graphical images. The novelty of this research lies in the application of mathematical morphological techniques for decimating the created images. The image created for the MW capacities of the power lines were decimated into categories and grouped into different colors for better visualization. The multi-color image is superimposed on the input image which is created for the MVA capacity of the network. The proposed method has been tested on an IEEE test system. The results from the present approach can help the planner and operator in a power station, to get a better visualization of the power network. This is the first time this kind of multi-color visualization is presented and it can be used to find the optimal path for power transfer from one bus to another.
  M. Srinivasan and S.U. Prabha
  This syudy is based on the reduction of power quality issues, using converter topology for Compact Fluorescent Lamp (CFL) applications. While concentrating on the parameters such as Total Harmonic Distortion (THD), Power factor and output voltage DC-DC converter topology is compared. On the performance analysis of Single-Ended Primary-Inductor Converter (SEPIC) and CUK converter, all the above parameters for the various duty ratio are analyzed and measured. To obtain steady state output voltage of both the converter are made to be operated in the closed loop system using PI Controller. In order to reduce the switching losses and achieving the Zero Voltage Switching (ZVS) the switching frequency of the Series Resonant Parallel Loaded Inverter (SRPLI) made to be greater than the resonant frequency. To analyze the above parameter for the various duty cycle value of the above converter topology are designed by using MATLAB/Simulink Model. The observed values of THD, power factor and output voltage are tabulated and compared.
  P.M. Balasubramaniam and S.U. Prabha
  The shunt active power filters are used in power systems for the compensation of harmonic currents generated for non linear loads. A reference current estimation method for control of SAPF using a digital filter based synchronous reference frame theory is presented. To extract the fundamental component of source current, the Synchronous Reference Frame (SRF) theory is suitable because of its easy mathematical calculation compared to the d-q Control algorithms. The compensation process is based on sensing line currents only which require sensing of harmonics or reactive power components of the load. Various simulation results are presented under steady-state conditions and the performance of PI controllers. Simulation results obtained with MATLAB and testing results on an experimental SAPF are presented to validate the proposed method. The synchronous reference frame based SAPF System to meet IEEE Standard 519 recommended harmonic standards for different rated nonlinear loads under balanced supply conditions.
  S. Chinnaiya and S.U. Prabha
  Matrix converter allows the direct ac/ac power conversion without dc energy storage links, in this study matrix converter and its working principles with harmonics in input side is analyzed. A model is proposed to represent the matrix converter, power semiconductors are modeled as ideal bidirectional switches and the matrix converter is controlled using ANFIS (Adaptive Neuro-Fuzzy Inference System) combine with optimum Venturini Modulation Method. The study deals the method to be utilized to eliminate the harmonics which is present in input supply side of matrix converter. Simulation for Matrix Converter System which shows the effectiness of proposed compensation scheme is discussed with MATLAB simulation results.
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