SINGLE STAGE AC-DC STEP UP CONVERTER USING BOOST AND BUCK- BOOST CONVERTERS

ABSTRACT: This paper presents a single stage AC-DC step up power converter that avoids the bridge rectification and directly converts the low AC input voltage to the required high DC Output voltage at a higher efficiency. In order to convert AC-DC we need a bridge rectifier and boost converter for step up the DC output voltage to meet the load demand. This twostage conversion process increases the converter cost and reduces the efficiency of converter due to presence of more no. of semi conductor devices. The proposed converter consists of a boost converter in parallel with a buck-boost converter. Boost converter operated in the positive half cycle and buck-boost converter in the negative half cycle. As a result we obtain a high DC output voltage from a low AC input voltage in single stage conversion. The proposed converter has been designed by using MATLAB

A Hybrid Particle Swarm Optimization Approach for Solving Optimal Power Flow With Thyristor Controlled Series Capacitor

ABSTRACT: This paper presents an application of Hybrid Particle Swarm Optimization (HPSO) to obtain the optimal settings of control variables. The HPSO technique is used to find the Optimal Power Flow (OPF) problem solution for minimization of fuel cost as objective function. The suitability of this approach is examined on the standard IEEE 14 bus test system with TCSC. Simulation results shows that the HPSO algorithm with TCSC gives better solution to enhance the system performance

A Fuzzy Logic Based Two Inductor Boost Converter System

Abstract: In many power factor correction applications, the power level can reach maximum value and sometimes the input voltage also will be too high. For high power and high voltage applications the inductor volume and weight is the major concern of the conventional boost converter. In this paper the two inductor boost converter is adopted which uses smaller inductors yielding high power density. This paper deals with the simulation of Fuzzy Logic based two inductor boost converter system. Fuzzy Logic controller is designed in MATLAB environment for the closed loop control model. Simulation results of converter for closed loop control strategy with both PI and fuzzy logic control techniques are discussed and compared

Multi-objective optimization in the presence of practical constraints using non-dominated sorting hybrid cuckoo search algorithm

A novel optimization algorithm is proposed to solve single and multi-objective optimization problems with generation fuel cost, emission, and total power losses as objectives. The proposed method is a hybridization of the conventional cuckoo search algorithm and arithmetic crossover operations. Thus, the non-linear, non-convex objective function can be solved under practical constraints. The effectiveness of the proposed algorithm is analyzed for various cases to illustrate the effect of practical constraints on the objectives' optimization. Two and three objective multi-objective optimization problems are formulated and solved using the proposed non-dominated sorting-based hybrid cuckoo search algorithm. The effectiveness of the proposed method in confining the Pareto front solutions in the solution region is analyzed. The results for single and multi-objective optimization problems are physically interpreted on standard test functions as well as the IEEE-30 bus test system with supporting numerical and graphical results and also validated against existing methods

IMPLEMENTATION OF LOAD FOLLOWING IN MULTI AREA HYDROTHERMAL SYSTEM UNDER RESTRUCTURED ENVIRONMENT

This paper presents the method in implementing the concept of load following adapted in an Automatic Generation Control (AGC) under restructured scenario. Open transmission access and the evolving of more socialized companies for generation, transmission and distribution affects the formulation of AGC problem. To accommodate new constraints associated with territorial of the traditional AGC two area system is modified to take into account the role of AGC in open market system. This paper investigates the performance of a load following controller on each generator involved in bilateral contracts. A suitable control strategy is also proposed for the generators taking part in load following to share a portion of the uncontracted power demanded by the customers. The concept of Disco Participation is employed and reflected in the two-area block diagram. The proposed system is tested for a two area hydrothermal system considering without and with contract violation. Simulation results show that the concept of load following is successfully implemented in the syste