Search results for: A.D. Rajkumar
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2008 Annual IEEE India Conference > 2 > 431 - 436
The use of STATCOM is a practical method for improving quality of power in distribution systems. In this paper direct power control of three-phase pulse width modulated converter based STATCOM without line voltage sensors is presented. This system is based on virtual flux estimation. Theoretical principles of this method are presented along with simulation results. Advantages of VFDPC-SVM over other...
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IET Science, Measurement & Technology > 2008 > 2 > 5 > 275 - 285
Frequency response analysis (FRA) is an emerging, powerful non-intrusive condition monitoring and diagnostic tool for verifying the mechanical integrity of power transformers. FRA results are graphical in nature and require trained experts to interpret test results. The work reported discusses numerical-criteria- based evaluation techniques. Persons not familiar with interpreting the FRA results can...
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This paper proposes a method for reduction of cogging torque with reduced stator tooth width and bifurcated active surface area using finite element analysis. For the proposed changes in the motor design the variation in the flux density distribution in the air gap, cogging torque and reluctance torque ripple are determined. The variations in the torque developed by the motor, cogging torque, output...
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The work reported concern with the simulation of a sensor controlled PMBLDC motor for trapezoidal and sinusoidal excitations. For both types of excitations Trapezoidal current control strategy is adapted. The simulated model is used to study the variation of speed, torque and current for various loads. A comparative study has been made for both types of excitations. The dynamic response was found...
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Reactive power management in a power distribution network of a power utility and industry plays a major role in reducing distribution loss, in maintaining constant distribution voltage and in improving power factor. The paper presents the simulation studies on a cascaded H-bridge converter based DSTATCOM for power factor improvement in power distribution set-up using load side compensation. In this...
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In the present scheme, modeling and simulation of sensorless control of permanent magnet brushless DC (PMBLDC) motor is carried out using zero-crossing back e.m.f technique. Since the neutral point of star connected machine is floating and not accessible to detect zero-crossing points, line back e.m.f information is considered. The motor is commutated at zero-crossing point of back e.m.f at 0deg delay...
