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International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.6, pp. 1925-1930
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.6, pp. 1925-1930

... controllers are tuned to control the VSC of the UPQC. The proposed system is modeled using Matlab/Simulink and simulation results are presented. The results revealed the fast recovery of stator, rotor, and dc link currents to their steady state values after fault removal. The electric torque, the ac ...
control strategy
control strategy

... and vice versa for critical loads was described in [7], where an extra static switch is required. A phaselocked loop (PLL) technique is commonly used in grid-connected converters to provide accurate estimation of phase angle for grid synchronization [8]. A PLL-based flexible transition control strat ...
Power on the move
Power on the move

... Per Skarby, Kenneth N. Jabrand, Alberto Zulati – Electricity market liberalization is ...
Power Quality Solutions
Power Quality Solutions

... sags and flicker, giving electric utilities and large electricity users the most cost-effective way to connect large loads to circuits. These systems are highly portable, configurable, and can be field-modified, reducing the costs normally associated with upgrades. More affordable than alternative s ...
O A RIGINAL RTICLES
O A RIGINAL RTICLES

... losses, load duration and changes of losses in various generating unit have been investigated. The developed distribution system provides a solution for improving the load flow of the system and their analysis. Key words: Distribution system, Load power, renewable distributed generation, voltage pro ...
if on the Internet, Press  on your browser to
if on the Internet, Press on your browser to

... Direct current could not easily be changed to higher or lower voltages. This meant that separate electrical lines had to be installed in order to supply power to appliances that used different voltages, for example, lighting and electric motors. This led to a greater number of wires to lay and maint ...
standing wave
standing wave

...  The standing wave conditions resulting from open- and short-circuited loads must usually be avoided in working with transmission lines.  However, with one-quarter and one-half wavelength transmissions, these open- and short-circuited loads can be used as resonant or reactive circuits. ...
Aalborg Universitet Asymmetrical Grid Fault Ride-Through Strategy of Three-phase Grid-connected
Aalborg Universitet Asymmetrical Grid Fault Ride-Through Strategy of Three-phase Grid-connected

... X. Guo is with the Key Lab of Power Electronics for Energy Conservation and Motor drive of Hebei province, Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China (e-mail: [email protected]) J. M. Guerrero is with the Department of Energy Technology, Aalborg University, Aalb ...
NRC INSPECTION MANUAL
NRC INSPECTION MANUAL

... A licensee’s ability to comply with Technical Specifications for OSP may depend on grid conditions and plant status; in particular, maintenance on, and degraded conditions of, key elements of the plant switchyard and offsite power grid can affect the operability of the OSP system, especially during ...
Power Quality issues and its improvement in wind
Power Quality issues and its improvement in wind

... be of large capacity, up to 2 MW, feeding into distribution network with high source impedance, particularly with customers connected in close proximity [1]. In case of fixedspeed wind turbine operation, all the fluctuation in the wind speed are transmitted as fluctuations in the mechanical torque, ...
Slides - Course Website Directory
Slides - Course Website Directory

... Used where higher service reliability is required Generally more expensive than radial systems Feeder conductors are sized to feed entire loop Loop systems can be used in underground residential distribution (URD), where faults are infrequent but are usually permanent ...
Grid Management Voltage Control Distribution Grid Voltage
Grid Management Voltage Control Distribution Grid Voltage

... • Utilities regulate the voltage on the distribution feeders so that the delivery voltage at the customers meter will stay within +/- 5% of nominal (ie. 120 V +/- 5% or 126-114V). The national standard related to this is ANSI C84.1 In some states, rules are slightly more stringent and may allow a sm ...
Three-level four-leg flying capacitor converter for renewable energy
Three-level four-leg flying capacitor converter for renewable energy

... mode of operation is possible and limit on maximal energy transfer in grid operation mode exists. Therefore in singlephase converter full utilization of produced energy may be not possible what cause the need to store or dissipate energy produced by the RES. These limits makes that the most common s ...
Eletronica de Potencia V18 - N4.indd
Eletronica de Potencia V18 - N4.indd

... gradual employment of Renewable Energy Sources (RES) as a non-pollutant and alternative sources of electrical energy. Firstly, photovoltaic (PV) systems were widely used to provide energy to remote areas, in standalone applications. However, with the power electronic development and the possibility ...
Aalborg Universitet
Aalborg Universitet

... disturbances, especially under unbalanced grid voltage conditions. Many interesting solutions have been reported in the last decades. In general, they can be clarified into two groups. One is the rotating-frame control strategy, and the other is the stationary-frame control strategy. A dual-sequence ...
III. Proposed controller design
III. Proposed controller design

... the measured stator voltage is decomposed sequences are used for current references calculation. Also, fundamental component is used for stator voltage phase-angle calculation. Finally, after current references are calculated, all of them will be transferred to the dq  reference frame, to avoid the ...
Doubly Fed Induction Generator for Wind Energy Conversion
Doubly Fed Induction Generator for Wind Energy Conversion

... generator and capacitor banks. Most of the wind turbines are fixed speed because of their simplicity and low cost. By observing and implementing wind turbine characteristics, one can clearly identify that for extracting maximum power, the machine should run at varying rotor speeds at different wind ...
1. introduction - Scientific Bulletin of Electrical Engineering Faculty
1. introduction - Scientific Bulletin of Electrical Engineering Faculty

... renewable energy technology, but also a mature electricity generation technology. A lot of different concepts have been developed and tested ([1], [2], [5], [6]). These developments have led to conceive many wind energy conversion systems schemes based on many criteria such: project size, WT models ...
Aalborg Universitet A generic inertia emulation controller for multi-terminal VSC-HVDC systems
Aalborg Universitet A generic inertia emulation controller for multi-terminal VSC-HVDC systems

... transmission system provides constant frequency and voltage amplitude for the wind farm network. As long as the frequency and AC voltage amplitude are maintained constant, the power generated by the wind farm is automatically absorbed by the WVSC and transferred to the DC link [11]. The WVSC should ...
The development of power electronics in Europe
The development of power electronics in Europe

... transformers. In contrast the rotary converter, system Leonard allowed an easy change of the DC voltage by regulating generator's excitation and load peaks could be reduce by the rotating mass. On the other side mercury arc rectifiers can work in a wide range of voltages and frequencies, so that one ...
Full Article
Full Article

... power stored in the DC link capacitor. Generally , premature removal of crowbar does not achieve good results and post late removal will make the machine to absorb more reactive power from the grid so, an automatic Crowbar protection is been employed which automatically works according to the requir ...
Challenge of Large Scale Wind Power Integration
Challenge of Large Scale Wind Power Integration

...  Increasing levels of wind penetration may increase the economic value of energy storage.  Energy storage may not be required up to 20% of wind power penetration levels. Value of storage is in the range of $ 1,000 - $ 1,600 / KW) depending on the generation mix of the system.  Higher levels of wi ...
EE14 paper1
EE14 paper1

... converters, the ground, and the high-pass filter form the closed loop for the harmonic current. Due to the unique characters of 3rd harmonic frequency components, it is selected to exchange the active power between series and shunt convertors in the DPFC. The reasons to select 3rd harmonic for excha ...
The Losses at Power Grid Caused by Small Nonlinear Loads
The Losses at Power Grid Caused by Small Nonlinear Loads

... fast in fields where relatively small investment provides huge savings of energy. The classical example represents incandescent lamps. Namely about 20% world consumption of energy is related to the light [2]. Therefore, this area represents the best place for involving a new technology for energy sa ...
27428 Demonstrate knowledge of grid-connected
27428 Demonstrate knowledge of grid-connected

... Providers must be granted consent to assess against standards (accredited) by NZQA, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment. Industry Training Organisations must be granted consent to assess against standards by NZQ ...
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Electrical grid



An electrical grid is an interconnected network for delivering electricity from suppliers to consumers. It consists of generating stations that produce electrical power, high-voltage transmission lines that carry power from distant sources to demand centers, and distribution lines that connect individual customers.Power stations may be located near a fuel source, at a dam site, or to take advantage of renewable energy sources, and are often located away from heavily populated areas. They are usually quite large to take advantage of the economies of scale. The electric power which is generated is stepped up to a higher voltage at which it connects to the electric power transmission network.The bulk power transmission network will move the power long distances, sometimes across international boundaries, until it reaches its wholesale customer (usually the company that owns the local electric power distribution network).On arrival at a substation, the power will be stepped down from a transmission level voltage to a distribution level voltage. As it exits the substation, it enters the distribution wiring. Finally, upon arrival at the service location, the power is stepped down again from the distribution voltage to the required service voltage(s).
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