The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
According to the growth of power generated by wind farms and the increased number of non-linear loads, providing a high quality electrical power, should be considered. This paper is addressed the issue of application and analysis of a Dynamic Voltage Restorer (DVR) to enhance the quality of power flows in a stand-alone microgrid, including wind energy conversion systems and the sensitive loads. The...
This paper introduces a low cost Smart Meter Architecture to suit vast and diverse Indian market. An extensive review on Smart Meters research and market has been presented. In addition, we propose a low cost add-on device for the existing electromechanical energy meters to update the customers about the billing and usage. A discussion on available and feasible communication technologies is included...
Finding a compromise for the use of several energy sources in order to meet the power demand of an electrical powertrain system is the objective of energy global optimization. The challenge is to design more efficient algorithms that give better result on consumption costs and require less computing time. The purpose remains to minimize the criterion “hydrogen consumption” whilst satisfying the power...
This paper proposes a method and an algorithm for determining the power flows of industrial electrical networks that contain induction motors. The paper describes the iterative algorithm for calculating the unbalanced power flow, an algorithm involving two steps: determination of slip and impedance and determination of the sequence voltages and currents within the network. The calculation of the induction...
In this paper, a data reduction technique is proposed for incremental learning of SVDD. Two methods are used in order to train a lot of data. One method is to remove redundant data. The other one is to remove the data that almost does not affect to next training. The removed data is located inside of the boundary mostly. As a result, a computation load is reduced and the storage space can be more...
Some of the most severe faults in electrical power networks are caused by faulty insulation or short-circuits. These events are accompanied by traces of partial discharges and traveling waves and recording such pulsed signals accurately is the key for providing effective on-line status monitoring of power lines. Capturing the high-frequency transients is very essential to protection means of local...
The aim of this paper is to present a harmonic model of wind farms using DFIG whereas all power system components are modeled in harmonic domain. After analyzing the effects of harmonics in power system, it is tried to model all the power system components such as transmission line, transformer, shunt reactor, load and back to back converter in harmonic domain. When the inverter DC voltage is converted...
Transmission and generation expansion planning (TEP and GEP) considering loadability limit of power system is studied in this paper. Artificial neural network (ANN) technique is used to evaluate loadability limit of the power system because of its sensitivity characteristic. Power system restructuring and separation of decision-making organizations of transmission and generation expansion, make coordination...
Fault occurrence in power system not only affects on reliability of system but also stability too. In many cases, fault occurrence in power system leads to voltage depressions -dips or sags- that damages to power system components. In this paper, using stochastic technique in appropriate modeled power system simulated in PSCAD/EMTDC software, maximum voltage sag will be calculated based on the Monte...
This paper investigates the modeling of energy carriers (electricity and gas) systems in the form of “energy hubs” in IRAN. In an energy hub, different energy carriers can interact with each other and an optimization problem can be solved to provide electricity and heat considering constraints on natural gas and electricity networks. Since IRAN has abundant natural gas resources, integrating electricity...
Distribution transformers are one of the most important equipment in power network. Because of, the large number of transformers distributed over a wide area in power electric systems, the data acquisition and condition monitoring is a important issue. This paper presents design and implementation of a mobile embedded system and a novel software to monitor and diagnose condition of transformers, by...
The aim of designing the wind turbine rotors is to improve the power capture ability. Since the rotor control technology is currently limited to controlling the rotor rotational speed and the pitch of the blades, an increasing concern has been given to the morphing blades. In this paper, a numerical code has been developed and validated based on the blade element momentum theory (BEMT). Then we compare...
This paper proposes a simple yet versatile rotor position computation algorithm (RPCA) for the rotor position and speed of a Wound Rotor Induction Machine (WRIM). The rotor position is computed in a straight-forward manner obviating the need for estimation. The resolved components of stator flux vector are computed using measurable stator and rotor quantities. Although it is an open loop technique,...
This paper introduces a new fault detection tool for Extra High Voltage (EHV) busbars. The new tool is to be used by extra high speed digital relays to detect busbar faults besides differentiating between close up line faults and busbar ones. The suggested tool uses a new technique that squares both of the instantaneous voltage signal and its complement to produce a unity relation in normal operating...
The aim of this paper is to present an impedance-based technique in order to fault detection in transmission overhead lines. When a fault happens in a power system, fast and reliable fault detection methods are not only desirable but also necessary. In this paper, an impedance-based fault detection technique is presented which applied in ANN. In this regard, using the zero sequence impedance values...
In order to avoid unnecessary loss of supply especially for high priority loads, distributed generators (DGs) stand-alone operation is getting more attention. However, to ensure more reliability, the islanded distribution network must reconnect to the grid as soon as the quality of supply from grid is refined. As the circuit breaker (CB) which had been opened for unintentional/intentional islanding...
Optimum placement of DG in distribution system, is highly dependent on the goal of using it. One of main purposes is to increase the reliability of power system. In order to evaluate reliability of system, some quantized indices are used in different levels of power system. Considering recent progresses made in technology and taking DGs into account as reliable power sources, authors of this paper...
The article discusses the possibility of usefulness of the energy potential of renewable energy. It focuses primarily on wind and solar energy, for which there is a great recently boom. The main part of the contribution is the identification and analysis of the theoretical potential share of the total power from renewable energy sources in networks selected member countries of the European Union....
A Strength Pareto Honey Bee Mating Optimization (SPHBMO) based Multi-stage Fuzzy (MSF) PID controller is proposed in this paper to solve the Load Frequency Control (LFC) problem in a deregulated environment. The power system LFC problems are caused by small load perturbations which continuously disturb the normal operation of power system. The objectives of LFC are to minimize the transient deviations...
Overhead power lines are the prevailing facilities to carry electric energy along big distances. Their proper functioning is very important for the current society due our highly electrical-dependent lifestyle. During their working, overhead power lines are under different phenomena, such as short-circuits, high-speed winds, extreme temperature conditions and impacts, which can disturb their operation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.