Informatics Publishing Limited

Chinnusamy Sujitha ¹, A. Ananthi Christy ¹, S. Rajasomashekar ², S. Ravi ³, R. Brindha ¹, P. U. Poornima ¹, Siddharth Pachpor ²

Affiliations
1 Department of EEE, SRM University, Chennai – 603203, Tamil Nadu, IN
2 Department of Electrical Engineering, Annamalai University, Chidambaram – Chidambaram, Tamil Nadu, IN
3 Department of Electrical Engineering, Botswana International University of Science and Technology, BW

Abstract

Background/Objectives: The objective of this research owes to propose a fixed voltage controller for wind energy based individual Self-Excited Induction Generator (SEIG). The ideology is that simple as to exploit the use of a voltage source inverter, employing with the fundamental principle of PWM technique that in corporate an individual battery source for the smooth operation. Methods/Statistical Analysis: The incidence of depressed voltage regulation because of the unexpected alteration in the speed and the load is one of the main demerits of the SEIG. In order to overcome this complicated situation, a modification of phase shift in the sinusoidal PWM is introduced, which standardizes the voltage of SEIG, when it is subjected to unexpected alteration in the load. Findings: It is likely to attain a fixed value of voltage when the load is altered from empty load to the complete load. The simulation of the presented scheme has been carried out by MATLAB/SIMULINK modeling. The consistency of the proposed model is determined by the outcomes of the prototype testing. Application/Improvements: By varying the modulating index of the voltage source inverter, the stabilization of output voltage for SEIG has been achieved. One of its major advantages is that by simply checking the dc link voltage, the characteristics of the current state can be predictable.

Keywords

Alteration in Load, Induction Generator, PWM, Self-Excited, Voltage Controller, Voltage Source Inverter.

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A. Ananthi Christy ¹, R. Brindha ¹, P. Ajay D. Vimal Raj ², S. Rajasomashekar ³, P. U. Poornima ¹, C. Sujitha ¹

Affiliations
1 Department of EEE, SRM University, Chennai - 603203, Tamil Nadu,, IN
2 Department of EEE, Pondicherry Engineering College, Pondicherry - 605014, Tamil Nadu, IN
3 Department of EE, Annamalai University, Annamalainagar - 608002, Tamil Nadu,, IN

Abstract

Objectives: Batteries have to be charged with constant current when they have very low charge and have to be charged at constant voltage when they have high charge. Methods/Statistical Analysis: To take care of the above mentioned objective a bidirectional battery charger is developed which can work as buck converter to boost converter from one direction to another. The buck operation can be used to charge a low voltage battery from a high voltage source and the boost operation is for vice versa. Findings: A Magnetically Coupled Bidirectional Battery Charger, the low voltage battery and high voltage battery have smooth and stable transition from Constant Current (CC) to Constant Voltage (CV) that can be achieved using neither control loop nor any extra switches. Applications/Improvements: To amplify the dc input voltage to the required high voltage level, an LC-circuit with high quality factor (Q-factor) is employed, in which, to make and break a high current pulse through the inductance, a power switch of MOSFET is employed. Usually, energy is stored in an inductance, when the current is made to flow through the inductance and if this current is cut, then the stored energy in the inductance is transferred to capacitance, which results in a high voltage across the capacitor that is filtered to be used to charge the high voltage batteries.

Keywords

Bidirectional Battery Charger, Buck/Boost Converter, Magnetically Coupled, Quality factor (Q-factor).

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S. Rajasomashekar ¹, A. Ananthi Christy ¹, P. U. Poornima ², R. Brindha ², C. Sujitha ², H. Bharath Varma ², Arul Mecloy Lobo ³

Affiliations
1 Annamalai University, Annamalai Nagar, Chidambaram - 608002, Tamil Nadu, IN
2 Department of EEE, SRM University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN
3 Bin Salim Enterprises, Sultanate of Oman, OM

Abstract

Background / Objectives: This paper narrates a novel strategy employing fuzzy logic for voltage profile enhancement and loss minimization in power systems. Linearized model is utilized and limit violations of control variables translated into fuzzy set notation. Methods/Statistical Analysis: The method adopted here for the voltage profile enhancement consists of certain number of load buses with definite VAR compensation schemes. In this work, it is mainly aimed to enhance the system voltage profile and thereby reducing power losses in it. Here, the linearization of objective functions and constraints is done about the current operating point. Findings: The equality and inequality constraints include dependent and independent variables. Later, power flow studies are used to calculate the limit violations of bus voltage magnitude and thereby a viable solution set that aims for voltage profile improvement as well as power loss reduction is finally obtained using appropriate operations of the fuzzy sets. In order to demonstrate the efficacy of this approach, IEEE 14 –bus test system is implemented. Application/Improvement: Due to the application of fuzzy logic, the control of variables in the problem is global and it involves less computational time and the results can have more accuracy.

Keywords

Fuzzy-based Strategy, Fuzzification and Membership Functions, Linearized Model, Reactive Power Scheduling, Voltage Profile Enhancement.

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A. Ananthi Christy ¹, K. Balamurugan ², P. Ajay D. Vimal Raj ³, S. Rajasomashekar ⁴, Kolla Srikanth ¹, Arul Mecloy Lobo ⁵

Affiliations
1 Department of EEE, SRM University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN
2 School of EEE, SASTRA University, Thanjavur - 613401, Tamil Nadu, IN
3 Department of EEE, Pondicherry Engineering College, Puducherry - 605014, Tamil Nadu, IN
4 Department of Electrical Engineering, Annamalai university, Annamalai Nagar, Chidambaram – 608002, Tamil Nadu, IN
5 Bin Salim Enterprises, Sultanate of Oman, IN

Abstract

Background/Objective: In power systems, the dispatch of real power plays a pivotal role in mitigating the transmission congestion, yet at a very low and affordable cost. Thus, in this paper, the rescheduling of real power generation has been dealt with a view to manage the congestion in transmission. Methods/Statistical Analysis: In this paper, the congestion management in a deregulated electricity market has been endeavored for the problems of Combined Economic and Emission Dispatch (CEED) by employing a novel technique of optimization through Artificial Bee Colony (ABC) algorithm. In a real time transmission system, the congestion is an inevitable condition that occurs when the power flow in the line exceeds than that of its limit. In this work, the optimized solution for CEED problem has been obtained via ABC algorithm. An encoding scheme based on generating unit is used. Findings: By employing a robust and efficient methodology using ABC algorithm, an optimal technique on congestion management has been proposed, which takes into account of corrective re-dispatch of real power through the transmission system, under the CEED – environment on a restructured power system. The proposed method has been tested on an IEEE 30-bus system and their results have also been validated to show the efficacy of the proposed methodology, which throw light upon the fact that it has emerged out as an effective tool in handling the transmission congestion in a deregulated environment that results in the minimization of cost of re-dispatch on one hand and in a secured operating condition on the other. Application/Improvements: This work can be extended in the future by including reactive power support, which can further minimize the total operating cost of the system.

Keywords

Artificial Bee Colony, Combined Economic Emission Dispatch, Congestion Management, Deregulated Electricity Market, Transmission Congestion.

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