Advanced Materials Research Vol. 768

Abstract: This paper proposes a shunt active filter to mitigate the power quality issues like unbalanced load current during nonlinear load. The proposed shunt active filter is constructed with the combination of cascaded H-Bridge multilevel inverter for achieving reduced %THD along with multiband hysteresis controller for accurate tracking of the reference signal followed by switching pulse generation for the MLI. The time domain based SRF controller is utilized for precise estimation of the reference signal. To authenticate the dynamic performance of the proposed shunt active filter, a test system is modeled in MATLAB / Simulink.

Abstract: The main objective of this work is to synthesize polyaniline/ferric chloride composite and to measure the conductivity of the as prepared composite. And also, to analyze the ability of using Ferric Chloride doped polyaniline as an electrode material for the fabrication of supercapacitor application. By in-situ polymerization method, polyaniline in pure form and doped form with the ferric chloride were synthesized using ammonium persulfate as initiator in HCl medium. Polyaniline nanoparticles and its composite are characterized by UV-Vis spectroscopy, FTIR, XRD and Conductivity meter.

Abstract: This paper presents the modelling and simulation of Dynamic Voltage Restorer (DVR) for mitigation of voltage sags and swells which are the major problems and issues on non linear loads.The Dynamic Voltage Restore (DVR) has become popular as a cost effective solutions for the protection of sensitive loads from voltage sags and swells.. The control of compensation voltages in DVR based on a-b-c to d-q-0 algorithm is discussed. The proposed control technique is cost effective and simple to design. Computer simulations are carried out in a suitable test system to investigate the effectiveness of control technique by using MATLAB/SIMULINK software.

Abstract: Power quality is one of major concerns in the present era. It has become important, especially, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply. To improve the power quality, custom power devices are used. The device considered in this work is DVR. This work presents a control strategy for a DVR to improve the stability in wind farms based on SCIG. The DVR controller is designed to work under unbalanced conditions, which allows overcoming most faults in the power grid. The proposed strategy is capable of balancing voltages at wind farm terminals obtaining several advantages. Firstly, negative-sequence currents are eliminated; thus, overheating, loss of performance, and decreasing of generator useful life are avoided. Secondly, by nullifying negative sequence voltages, 2ω pulsation in the mechanical torque is prevented, reducing high stress in the turbine mechanical system, especially in the gearbox. The power system, DVR converter, and controller were implemented in the Sim power Systems blockset of SIMULINK/MATLAB®.

Abstract: Reliability analysis plays a very vital role in designing and planning of radial distribution systems that operate for minimal interruption of customer loads. The Distributed Generation (DG) in a radial distribution network has been slowly increasing for the last few years due to advancement of technologies and institutional changes in the electric power industry. This paper presents a reliability analysis for large scale, radial (with respect to substation) and reconfigurable electrical distribution systems. This paper evaluates the improvement in reliability over a time varying load curve.

Abstract: This paper gives an overview on Speed control of Induction Motor via Pic Controller using Lab VIEW. For Monitoring and controlling the Induction motor speed we can use the Lab View Simulation software. Lab VIEW Software can be used for continuous monitoring in an Real Time System applications. Most of the Industrial Automation control process are done by Lab VIEW software only. Lab VIEW Software plays major role in Industrial Monitoring and control systems. There are various types of controller used in Drive control systems in order to perform some actions such as Speed control, Run Motor in both forward and reverse direction. Here we have used Pic Controller for speed control process. From Lab VIEW software we can send Signals to Pic Controller to Run Induction Motor in either Forward/Reverse Direction and we can set the Speed of the Motor.

Abstract: This paper presents a method using nodal pricing for optimal allocating distribution generations (DG) for profit maximization, reduction of loss in distribution network along with social welfare maximization. Inclusion of distributed generation (DG) resources in power system changes the power flows and the magnitude of network losses at the distribution side. A detailed analysis has been simulated in MATLAB with 33 bus distribution system. The Genetic algorithm optimization is used in this work to find optimal location and size of DG in radial distribution system. Applying nodal pricing to a model distribution network, it shows significant price differences between buses reflecting high marginal losses and by finding optimal size of DG maximizes the profit of distribution companies that use DG in their networks for obtaining multiple benefits.

Abstract: Distributed generators (DG) are much beneficial in reducing the losses effectively compared to other methods of loss reduction. It is expected to become more important in future generation. This paper deals with the multi DGs placement in radial distribution system to reduce the system power loss and improve the voltage profile by using the optimization technique of particle swarm optimization (PSO). The PSO provides a population-based search procedure in which individuals called particles change their positions with time. Initially, the algorithm randomly generates the particle positions representing the size and location of DG. The proposed PSO algorithm is used to determine optimal sizes and locations of multi-DGs. The objective function is the combination of real, reactive power loss and voltage profile with consideration of weights and impact indices with and without DG. Test results indicate that PSO method can obtain better results on loss reduction and voltage profile improvement than the simple heuristic search method on the IEEE33-bus and IEEE 90-bus radial distribution systems.

Abstract: Transient stability is an important aspect in planning and operation of an electric power system. The application of Fuzzy logic and Adaptive Neuro Fuzzy Inference System (ANFIS) approach to power system problems has received increased attention in recent years. This paper investigates the fuzzy logic based Unified Power Flow Control (UPFC) methods namely in-phase voltage control and quadrature voltage control in improving transient stability of power system using energy function method. The potential of the two control methods in transient stability enhancement is identified in Single Machine Infinite Bus System (SMIB) system. UPFC is connected in SMIB system in middle of the transmission line. Results indicate that significant reductions in the transient swings are obtained with UPFC. The result shows that the transient stability margin is substantially improved with in-phase voltage control higher than the quadrature voltage contro1.

Abstract: This paper presents a novel application of full-bridge series parallel resonant converter (FBSPRC) for dc source and secondary battery interface. Secondary batteries has been widely used in the application of residential, industrial and commercial energy storage systems because of its low energy conversion loss, which enhances the systems overall efficiency. A series parallel loaded resonant converter (SPRC) which is a subset of DC-DC converter can be operated with either zero-voltage turn-on (above resonant frequency) or zero current turn off (below resonant frequency) to eliminate the turn on and turn-off losses of the semiconductor devices. This converter is widely used to achieve reduction in size of the passive components of the converter such as inductor, capacitor and transformers. Simulation results based on a 12V 45Ah battery charger are proposed to validate the analysis and to demonstrate the performance of the proposed approach. Satisfactory performance is obtained from the measured results. The simulation results validate the effectiveness of the chosen battery charger.