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G. Pandian ¹, S. Rama Reddy ²

Affiliations
1 Electrical and Electronics Engineering Department, Sathyabama University, Chennai, IN
2 Electrical and Electronics Engineering Department, Jerusalem College of Engineering, Chennai, IN

Abstract

This paper presents the simulation of three phase nine level inverter fed induction motor drive. The poor quality of voltage and current of a conventional inverter fed induction machine is due to the presence of harmonics and hence there is significant level of energy losses. The nine level inverter is used to reduce the harmonics. The inverters with a large number of steps can generate high quality voltage waveforms. The nine levels can follow a voltage reference with accuracy and with the advantage that the generated voltage can be modulated in amplitude instead of pulse-width modulation. An active harmonic elimination method is applied to eliminate any number of specific higher order harmonics of multilevel converters with unequal dc voltages. The simulation of three phase nine level inverter fed induction motor model is done using Simulink.

Keywords

Induction Motor, Multilevel Converter, PWM

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R. Sowmya ¹, S. Rama Reddy ²

Affiliations
1 Sathyabhama University, Chennai, IN
2 EEE Dept., Jerusalem College of Engineering, Chennai, IN

Abstract

This paper deals with modelling and simulation of high step up DC – AC converter with micro source at the input. The 15V DC is stepped up to 230V DC using high step up DC-DC Converter. This DC is converted into AC using a single phase inverter. The DC-AC converter system is modeled and simulated using the blocks of simulink and the results are presented in this paper.

 

Keywords

DC to AC Converter.

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P. Usha Rani ¹, S. Rama Reddy ¹

Affiliations
1 EEE Department, Jerusalem College of Engineering, Chennai, IN

Abstract

The Dynamic Voltage Restorer (DVR) provides an advanced and economical solution for both voltage sag and swell problems. The voltage-restoration process involves real-power injection into the distribution system. The Interline DVR (IDVR) proposed in this paper provides a way to compensate the voltage deviation caused in a feeder. The IDVR consists of several DVRs connected to different distribution feeders in the power system sharing common energy storage. Here, one DVR in the IDVR system works in voltage-sag/swell compensation mode while the other DVR in the IDVR system operate in power-flow control mode. The single phase model of the IDVR system is illustrated which is operated by Multiple Pulse Width Modulation (PWM). A new topology based on Z-source inverter is presented in order to enhance the voltage restoration property of dynamic voltage restorer. Z-source inverter would ensure a constant DC voltage across the DC-link during the process of voltage compensation. The modeling of Z-source based dynamic voltage restorer is carried out component wise and their performances are analyzed using MATLAB software. The simulation results shows that the control technique is very effective and yields excellent compensation for voltage sag/swell mitigation.

Keywords

Power Quality, Dynamic Voltage Restorer (DVR) Interline Dynamic Voltage Restorer (IDVR), Dynamic Voltage Restorer (DVR), Interline Power Flow Controller (IPFC), Z-Source Inverter (ZSI), Pulse Width Modulation (PWM), Total Harmonic Distortion (THD).

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S. Nagarajan ¹, S. Rama Reddy ²

Affiliations
1 Jerusalem College of Engineering, Center for Collaborative research with Anna University, Chennai, IN
2 Electrical and Electronics Engineering Department, Jerusalem College of Engineering, Center for Collaborative Research with Anna University, Chennai, IN

Abstract

This paper deals with detection of broken bars in three phase squirrel cage induction motor using finite element model of the induction machine. Finite element method is more precise than the winding function approach, as it is based on the actual geometry of the machine. The machine model can easily be modified to study the effect of faults on the machine‟s performance. Accurate models of the machine under healthy and faulty conditions are developed. The static two-dimensional analysis is done for broken bar fault. The machine parameters like flux linkage, flux density and stored magnetic energy are obtained for healthy and faulty motor. The results examined under various conditions are compared and the observations are presented.

Keywords

Three Phase Squirrel Cage Induction Motor, Broken Bars, Field Distribution, Flux Density, Finite Element Analysis.

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K. Narasimha Rao ¹, V. C. Veera Reddy ², S. Rama Reddy ³

Affiliations
1 JNTU and S.V. University, Tirupati, IN
2 Department of Electrical Engineering, S.V. University, Tirupati, A.P., IN
3 Electrical and Electronics Engineering Department, Jerusalem College of Engineering, Chennai, IN

Abstract

This paper deals with the implementation of input parallel, output series QRC fed DC servo drive. The salient feature of QRC is that the switching devices can be either switched on at zero voltage or switched off at zero current, so that switching losses are zero ideally. Switching stresses are low, volumes are low and the power density is high. This property imparts high efficiency and high power density to the converters. The output of QRC is regulated by varying the switching frequency of the converter. Hence it is called Frequency modulated Zero current/zero voltage switching quasi resonant converter. The present work deals with the simulation and implementation of DC Servo motor fed from Input parallel output series ZCS—QRC. Simulation results show that the ZCS-QRC’s have low total harmonic distortion. Input parallel output series QRC fed DC servo drive is simulated and the results are presented. This converter is proposed for DC servo motors with higher voltage rating. The experimental results are compared with the simulation results.

Keywords

Input Parallel Output Series Converter (IPOSC), Interleaved Buck Converter (IBC), Pulse Width Modulation (PWM), Quasi Resonant Converter (QRC).

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D. Kirubakaran ¹, S. Rama Reddy ²

Affiliations
1 St. Joseph‟s Institute of Technology, Chennai, IN
2 Jerusalem Engineering College, Chennai, IN

Abstract

An embedded controlled single-switch parallel resonant converter is introduced for induction heating applications. The circuit comprises of an input LC-filter, a bridge rectifier and a controlled power switch. The switch operates in the soft commutation mode and serves as a high frequency generator. This scheme overcomes the shortcomings of the previous schemes i.e. the presence of the DC component in the load current. The steady-state analysis of the converter is given. The theoretical analysis and the computer simulation satisfy the experimental results.

Keywords

Power Electronics, AC-AC Parallel Resonant Converter, Induction Heating, Closed Loop Control, Embedded Control.

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A. Suresh ¹, S. Rama Reddy ²

Affiliations
1 Sathyabama University, IN
2 Jerusalem College of Engineering, Chennai, IN

Abstract

Highly efficient LLC resonant inverter fed ferromagnetic load with asymmetric voltage-cancellation control technique is the state of the art technique. It uses a full-bridge topology for induction heating application. The converter operates effectively even for fluctuating source and it operates in zero-voltage switching mode (ZVS). In spite of variation in load magnitude, the operating frequency is automatically adjusted to maintain a constant lagging power angle. The switching devices need only a single DC power supply for gate driver circuitry which reduces the overall cost of the system. The output power is controlled by using the asymmetrical voltage-cancellation technique, which results in increase in the overall efficiency of the ferromagnetic load. The drawbacks in series or parallel resonant inverters are alleviated in LLC inverter. The present paper is targeted at the validation of the simulation results obtained by the same author through experimental results and compare the same with conventional voltage control method.

Keywords

Induction Heating, LLC Resonant Inverter, Zero Voltage Switching (ZVS).

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