VOLTAGE AND FREQUENCY CONTROL OF SEIG FOR STAND ALONE RENEWABLE ENERGY SYSTEM

K.Sasikumar ¹, N.Chitra ²

¹PG student- Department of EEE – S.K.P Engineering College, Thiruvannamalai,Tamilnadu, India.

² Assistant Professor- Department of EEE – S.K.P Engineering College, Thiruvannamalai,Tamilnadu, India.

            Induction generators are increasingly being used in nonconventional energy systems. The advantages of using an induction generator instead of a synchronous generator are well known. Some of them are reduced unit cost and size, ruggedness, brushless (in squirrel cage construction), ease of maintenance, self-protection against severe overloads and short circuits, etc. In isolated systems, squirrel cage induction generators with capacitor excitation, known as self-excited induction generators (SEIGs), are very popular. This paper discusses the regulation of the voltage and frequency of a stand-alone wind energy conversion system (WECS) based on a self-excited squirrel-cage induction machine. The proposed new closed loop PWM controller (AC-DC-AC) is used to maintain constant voltage and constant frequency at the output of the generator against varying rotor speed, changing load conditions and  as well as to generate optimum power from the induction generator. The feasibility of the proposed system is simulated by using MATLAB/ Simulink.

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GSM BASED AUTOMATIC ENERGY METER READING & LOAD CONTROL

S.Balaji ¹, S.Jegedeeswaran ²,  M.Rajeshwaran ³,  V.Kumarasamy ⁴

^{1 2 3}UG student- Department of EEE – Vickram College of Engineering, Enathi Tamilnadu, India.

⁴Assistant Professor - Department of EEE – Vickram College of Engineering, Enathi Tamilnadu, India. 

           Traditional metering method for retrieving the energy data is not convenient and the cost of the data logging systems is high. So this paper presents of design and development of Automatic meter reading (AMR) system. AMR system is a boom for remote monitoring and control domestic energy meter. AMR system give the information of meter reading, power cut, total load used, power disconnect and tempering on request or regularly in particular interval through SMS. This information is being sent and received by concerned energy Provider Company with the help of Global system for mobile communication (GSM) network. Energy provider receives the meter reading within a second without visiting person. AMR minimize the number of traditional visits required by employs of energy Provider Company. This system not only reduces the labor cost but also increase meter reading accuracy and save hugs amount of time.

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REDUCTION OF COGGING TORQUE AND MAXIMIZING BACK EMF BY ROTOR OPTIMIZATION IN BLDC MOTOR

M.Bharathi¹, M.Santhi ²

¹PG student- Department of EEE – Sethu Institute of Technology, Kariapatti, Tamilnadu, India.

²Professor - Department of EEE – Sethu Institute of Technology, Kariapatti, Tamilnadu, India.

          At present, most of the electric vehicles are using BLDC motors for various advantages such as high efficiency, compactness, easy controllability etc. But sometimes their efficiency is poor due to the presence of cogging torque and minimized back EMF, hence increasing THD level. The main aim of this work is to reduce the cogging torque and maximize back EMF in order to optimize the rotor shape. Although so many control strategies are employed for minimization of cogging torque, we have used pole arc combination method in this proposed paper. This method is done by Genetic Algorithm using MATLAB. Due to the magnetic saturation and relative complex structure, the cogging torque in IPM brushless machines is more complicated than that in the surface permanent magnet brushless machines. Pole arc combination method offers a better alternative for cogging torque reduction. The motor parameters are taken to do this process. Due to the reduction of cogging torque, THD level is also decreased. In future, FEM analysis is carried out to increasing back EMF.

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DESIGN AND SIMULATION OF MULTILEVEL CURRENT SOURCE INVERTER USING DUALITY PRINCIPLE

M.Madhu Shobini ¹, Rathina Prabha²

¹PG student- Department of EEE – Mepco Schlenk Engineering College, Sivakasi Tamilnadu, India.

²Professor- Department of EEE – Mepco Schlenk Engineering College, Sivakasi Tamilnadu, India.

This paper explores the issue of constructing Multilevel Current Source Inverter (MCSI) topologies using the duality principle on the existent Multilevel Voltage Source Inverter (MVSI) topology. In order to apply the duality principle for three phase power electronic circuits which are non-planar, two methods for planar treatment with three phase VSI are established - (a) By adding an extra leg. (b) By adding an extra voltage source. While implementing any one of these methods, an improved topology of three phase flying capacitor multilevel voltage source inverter is obtained. Then a new kind of three phase MCSI topology is derived from the application of duality on such MVSI topology. Finally, operational principle of this new MCSI is analysed and simulation model has been built up to verify the proposed MCSI structure.

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A SINGLE-SWITCH RESONANT POWER CONVERTER FOR DC TO DC ENERGY CONVERSION APPLICATIONS

K.Ramya¹, A.Srinivasan ²

¹PG student- Department of EEE – Sethu Institute of Technology, Kariapatti, Tamilnadu, India.

²Professor - Department of EEE – Sethu Institute of Technology, Kariapatti, Tamilnadu, India.

In this paper presents a single-switch resonant power converter topology suitable for DC to DC energy conversion applications. The single-switch resonant converter has numerous well-known advantages compared to the traditional hard-switching converters. The active power switch is controlled by pulse width modulation at a fixed switching frequency and a constant duty cycle. In addition, this technique offers many other advantages such as small volume, and light weight of components due to high switching frequency and high efficiency. This paper presents a resonant DC to DC converter which operating at a fixed frequency. Input and output stage of the converter is filtered by means of a low pass filter. A PID controller is provided in feedback loop for enhanced performance, maintain and control the voltage. Operating principles are derived, and analyses are carried out based on the equivalent circuits for the proposed power converter under different operating modes. The active power switch can be operated with ZVS, and a measured energy conversion efficiency of the proposed topology of 99.3% can be achieved under PLECS software environments. Simulation results are presented to verify the operation of the conversion system.

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SOFT-SWITCHING PWM CONVERTERS WITH CURRENT SHARING IN SWITCHES

E.Subbulakshmi ¹, B.V.Manikandan ²

¹PG student- Department of EEE – Mepco Schlenk Engineering College, Sivakasi Tamilnadu, India.

²Professor- Department of EEE – Mepco Schlenk Engineering College, Sivakasi Tamilnadu, India.

A new family of soft-switching pulse width modulation (PWM) converters has been presented in this work. In  this  family  of  converters, two switches  operate  out of  phase  and  share  the  output  current  while   providing  soft-switching  condition  for  each  other. A  buck converter, from this  family  of  converters  is  analyzed  and  its  operating  modes are  discussed. The  adoption  of  the  regular PWM  control  circuit  to  the  proposed  converters  is  simulated using simulink tool in MATLAB  environment.

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STATIC DEVICE AND TRANSMISSION LINE MONITORING USING ARDUINO

S.Hariharan ¹, A. Arun Pandian², M. Ganesh Kannan ³, P.Pavunraj⁴

^{1 2 3}UG student- Department of EEE – Vickram College of Engineering, Enathi Tamilnadu, India.

⁴Assistant Professor - Department of EEE – Vickram College of Engineering, Enathi Tamilnadu, India.

The transformer monitoring and protection on electrical power lines are important factors in power system.  The Paper proposes the idea of monitoring of transformer and Power lines using SMS based GSM Technology. The Proposed methodology is designed and implemented using Adruino processing board to monitor load fluctuations with respect to current and voltage in electric power lines. The proposed on-line monitoring system is installed at the  site  and above mentioned parameter are read analog port in the Arduino board .The acquired parameters are processed in the system memory. If there is any abnormality according to some predefined instruction and policies that are stored on the Arduino board memory then GSM alerts to concerned control room immediately. This mobile system will help the utilities to optimally utilize the protection of transformer and power line and identify problems before any catastrophic failure.

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