Application Of Differential Evolution Technique For Short Term Hydrothermal Scheduling And Its Comparision With Other Meta Heuristic Search Algorithms

Vol. 6 No. 3

Year: 2013

 
Issue: Jan-Mar

Title: Application Of Differential Evolution Technique For Short Term Hydrothermal Scheduling And Its Comparision With Other Meta Heuristic Search Algorithms  

Author Name: S.Padmini, C. Christober Asir Rajan

 

Synopsis:

This paper proposes an application of Differential Evolution Technique(DE) for solving short- term scheduling problem.Generally Short-term hydrothermal scheduling involves the hour by hour scheduling of all generation on a system to achieve minimum production cost.A set of starting conditions is given and the optimal hourly schedule that minimizes the desired objective,while meeting hydraulic and steam constraints is sought and solved using Differential Evolution. . The results are examined to validated the effectiveness of the algorithm in comparision with other Meta heuristic algorithms like GA, GS, IFEP, SA and PSO.

Design and Simulation of AC to DC Single Stage Converter for Low Voltage Application

Vol. 6 No. 3

Year: 2013

 
Issue: Jan-Mar

Title : Design and Simulation of AC to DC Single Stage Converter for Low Voltage Application 

  

Author Name : Honey Susan Eldo, Dhayalini. K

Synopsis :  

In this paper, an ac/dc converter is presented that can boost very low ac voltages to a higher dc voltage. The converter is based on a new hybrid form of boost converter and a buck boost converter and it is suitable for power harvesting applications too. The measured prototype can supply 3.3V by converting an input voltage of 400mV delivered by an electromagnetic microgenerator. Detailed analysis of converter is carried out and based on that control schemes are proposed to operate the converter.

Simulation and Performance of Matrix Converter with Faulty Conditions

Vol. 6 No. 3

Year: 2013

 
Issue: Jan-Mar

Title : Simulation and Performance of Matrix Converter with Faulty Conditions   

Author Name : Dr.S.Sankar, Dr.S.Saravanakumar , M.Padmarasan 

Synopsis : 

This paper presents a matrix converter for power flow management. The matrix converter has several advantages over traditional rectifier-inverter type power frequency converters. It provides sinusoidal input and output waveforms, with minimal higher order harmonics and no sub harmonics. The matrix converter having the ability to generate multilevel output voltages, this converter is able to produce better quality output waveforms than conventional matrix converter in terms of harmonic content. This paper gives the performance of a matrix converter and the qualitative analysis of some performance parameters is carried out. Some numerical results based on a simulation model of a matrix converter system are also presented. The simulations results of different load conditions are presented .The open loop controlled system is simulated and the waveform output is predicted at various conditions.

Investigation on Symmetrical Three Phase Hybrid Cascaded Multilevel Inverter With Reduced Number of Switches

Vol. 6 No. 3

Year: 2013

 
Issue: Jan-Mar

Title : Investigation on Symmetrical Three Phase Hybrid Cascaded Multilevel Inverter With Reduced Number of Switches

Author Name : V. Vidhya, C.R.Balamurugan , S.P.Natarajan

Synopsis :

This work proposes investigation on symmetrical three phase hybrid cascaded multilevel inverter topology with reduced number of switches and is able to create five level output. The main advantage of the proposed work is to reduce the number of switches when compared to the Cascaded Multi Level Inverter (CMLI). The reduced number of switches reduces the switching losses and improves the efficiency of the inverter. The variation of Total Harmonic Distortion (THD) in the inverter output voltage is observed for various modulation indices. Simulation is performed using MATLAB-SIMULINK. By comparing the various PWM techniques, such as COPWM-1, COPWM-2, COPWM-3 and COPWM-4, it is observed that Carrier Overlapping Pulse Width Modulation-3 (COPWM-3) provides output with relatively low distortion for all strategies and better DC bus utilization is obtained in (COPWM-1) and also comparing the various variable amplitude techniques, such as  VACOPWM-1, VACOPWM-2, VACOPWM-3 and VACOPWM-4, it is observed that Variable Amplitude Carrier Overlapping Pulse Width Modulation-3 (VACOPWM-3) provides output with relatively low distortion for all strategies and better DC bus utilization. Finally comparing the various PWM techniques with  the various variable amplitude techniques, It is observed that Variable Amplitude Carrier Overlapping Pulse Width Modulation-3 (VACOPWM-3) provides output with relatively low distortion for all strategies and better DC bus utilization is obtained in (VACOPWM-2).

Analysis of Temperature Field in Switched Reluctance Machine Based on Regression Technique

Vol. 6 No. 3

Year: 2013

 
Issue: Jan-Mar

Title : Analysis of Temperature Field in Switched Reluctance Machine Based on Regression Technique

Author Name : Annie elisabeth jebaseeli, S.Paramasivam

Synopsis : 

This paper presents   a novel method  for the  determination of   temperature rise in rotating electrical machine. Rise in the winding temperature was determined from the  estimated values of winding resistance during the heat run test conducted as per IEC standard. The estimation of hot resistance was modeled  using multiple variable linear regression . The modeled hot resistance helps to find the load losses at any load situation without using complicated measurement set –up. This technique was applied for the hot resistance estimation for Switched Reluctance Machine using the input variables as cold resistance, ambient temperature and temperature rise. The results are compared and they show a good agreement between measured and the computed values. The proposed method was verified using experimental results obtained from temperature rise test on a 2 H.P 8/6 Switched Reluctance Machine.