Found 1972 related files. Current in page 1
This paper presents the design and construction of charge controller for wind energy source. The charge controller is a small prototype that is suitable to charge small battery. The maximum charging current of the charge controller is about 7 A. The charge controller is designed using PIC 16F877A microcontroller, liquid-crystal display (LCD), silicon-controlled rectifier (SCR), rectifier diodes and other electronic components. The SCR and rectifier diodes in conjunction with other components are used to charge the battery. The battery charging is controlled by the microcontroller circuit. The LCD module displays the status of the battery while it is charging. At the same time the voltage level of the battery is also displayed. The microcontroller controls the charging circuit and diverted the charging current to the diverted load if the battery is fully charged. The microcontroller also produces signal to the audible alarm circuit in the case of full charge battery.
Due to the rapid technological progress, the consumption of electric energy increases continuously. But the transmission systems are not extended to the same extent because building of new lines is difficult for environmental as well as political reasons. Hence, the systems are driven closer to their limits resulting in congestions and critical situations endangering the system security. Power Flow Control devices such as Flexible AC Transmission Systems (FACTS) provide the opportunity to influence power flows and voltages and therefore to enhance system security, e.g. by resolving congestions and improving the voltage profile. Several kinds of FACTS controllers have been commissioned in various parts of the world. This paper presents various types of FACTS devices such as: load tap changers, phase-angle regulators, static VAR compensators, thyristorcontrolled series compensators, interphase power controllers, static compensators, and unified power flow controllers.
In this research work of Gas Metal Arc Welding(GMAW) show the effect of Current(A),Voltage(V),Gas Flow rate(L/Min) and Speed(M/Min) on Ultimate Tensile Strength(UTS) of st-37 low alloy steel material, In this Experiment we done Experiment by using L9 orthogonal Array to find out UTS and also perform confirmatory Experiment to find out optimal run set of current, voltage speed and gas flow rate.
Voltage control and fast reactive power compensation are two main application area of Static Synchronous Compensator (STATCOM), which is a shunt connected voltage source converter (VSC) based FACTs controller using power semiconductor devices (particularly IGBT, GTO etc.).However, the total Statcom circuitry has complex and coupled system dynamics which require advanced controllers to achieve well performance. In our paper, we have represented a sixty pulse VSC for producing higher pulse number by combining a twelve pulse converter with a five level VSI in order to obtain the overall performance of the said VSC in a three phase system. As the number of levels increases in the VSI of the Statcom, it will produce a staircase wave with lower value of THD. The simulation results are presented and it is observed that the STATCOM shows excellent response to step change in the reactive current reference & the value of THD is also within the acceptable limit.
At the time of power swing the measured impedance lies inside the relay operating region. There is undesired tripping of Distance relay during power swing without having any fault. So relay must be blocked & must trip after a fault occur during power swing. This paper presents new technique to detect fault during power swing. In the proposed technique process starts by simulating the double transmission line with one line series compensated. When we connect a fixed capacitor in one transmission line, fault detection become more difficult. The detection of symmetrical fault during swing is more difficult. So the proposed technique can easily detect any fault during swing with series compensated line. Sampled data of current and voltage passes through wavelet transform. It decomposes it into different levels. Then we calculate total energy of some selective levels of current and voltage. A double circuit line model is simulated in EMTDC/PSCAD.
Circuit Breaker Market & Fuse Market categories the Global Market by type (Medium, High, Low Voltage), Application Non-Residential/Residential Construction, Electronic/Electrical Equipment, Transportation Equipment (Automotive/Non-Automotive) & by Geography
Abstract- Accurate estimation of state of the charge (SOC) is vital for electric vehicle batteries. This paper presents a novel method to estimate the SOC based on a neural network which can be programed into a low cost microcontroller. The microcontroller monitors the battery voltage and takes four samples immediately after the battery is disconnected from the load and monitors the steady state terminal voltage when the vehicle is parked for more than 30 minutes to train a neural network. Each time the battery is disconnected from the load while driving, the microcontroller takes four voltage samples to estimate the SOC using the previously trained neural network. In order to increase the accuracy, the battery temperature is also taken as an input.
The paper presents the modeling, simulation and analysis of an AC-DC converter based PWM rectifier. It provides a suitable control algorithm for a pulse width modulation rectifier which reduces ripple from the DC output side as well as shapes the input current properly. The basic objective of a PWM rectifier is to regulate the DC output voltage and also ensure a sinusoidal input current and unity power factor operation. This is implemented by high speed IGBT switches connected in anti parallel mode across the rectifier diodes
This paper proposes a coordinated control of rotor side converters (RSCs) and grid side converters (GSCs) of variable speed doubly-fed induction generator (DFIG) based wind generation systems under unbalanced voltage conditions. The control scheme uses stator flux-oriented control for the rotor side converter and grid voltage vector control for the grid side converter. System behaviours and operations of the RSC and GSC under unbalanced voltage are illustrated. The cocoordinated control schemes manage to restore the wind turbines normal operation after the clearance of fault
In this paper, we give an overview of the power line communication (PLC) technology. This paper presents an overview of the research, applications, standards and importance of the power line communication. Power line communication is an emerging home network technology that allows consumers to use their already existing wiring system to connect home appliances to each other and to the Internet. Noise in power line communication and impulsive noise are presented in this paper. The PLC channel is discussed to such an extent