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What are the advantages and disadvantages of flexible ac transmission systems?
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∙ 10y ago
K. S. Hook, Y. Liu, and S. Atcitty, "Mitigation of the wind generation
integration related power quality issues by energy storage," EPQU J.,
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∙ 10y ago
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What were the advantages and disadvantages of ac over dc?
The most significant advantage for people who do not know much/anything about electricity is that polarity (+/-) doesn't matter with alternating current. You can read everything about the "War of Currents" at: http://en.wikipedia.org/wiki/War_of_Currents
Does any country use DC?
No country distributes electrical energy to homes or industry as d.c., but many country use high-voltage d.c. transmission systems -particularly for long-distance transmission (lower losses than a.c.), or for interconnecting independent grid systems (no synchronisation problems), or for undersea cables (no reactive currents),
Why is ac more useful then DC?
Firstly, AC is not always used for transmission rather than DC, DC transmission is becoming a frequently useful form of transmission and has several advantages in certain circumstances. Though the reason AC is used more than DC is as follows: Firstly, the output of power stations comes from a rotary turbine, which by it's nature is AC and therefore requires no power electronics to convert to DC. Secondly it is much easier to change the voltage of AC electricity for transmission and distribution. thirdly the cost of plant associated with AC transmission (circuit breakers, transformers etc) is much lower than the equivalent of DC transmission AC transmission provides a number of technical advantages. When a fault on the network occurs, a large fault current occurs. In an AC system this becomes much easier to interrupt, as the sine wave current will naturally tend to zero at some point making the current easier to interrupt. It is also easier to meter AC connections, to monitor power flows accross a network. DC transmission however, is used to link two completely different AC systems. An AC link would require the two systems to be entirely in sync, with the peaks and troughs of the AC wave to occur at the same time. With a DC transmission link, this can be negated allowing the link of, for example, the UK and European transmission network. (See National Grid website for information on the HVDC England - France connector) We can make a d.c transmission plant like a.c because we can't get uninterrupted power supply like a.c .after a certain time d.c source (battery) need charge for recharging it self .
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