It's easier to stay DC for the long transmission. It's easier to pool power at a nominal DC intermediate voltage, simplifying control. Wind turbines tend to be connected in short hops to hubs before being connected to a single long distance transmission line (very long in the case of offshore). They are more mature than matrix converters, so with the long planning involved in electrical infrastructure are more likely to have been chosen. However, I can think of many advantages to using an intermediate DC link.ĪC-DC and DC-AC converters are being made in large numbers, in large sizes for DC links where long distance transmission is a factor. They are becoming increasingly used for motor drives. Regulating Fixed DC Voltage Applications AC to DC Converters AC to DC Converters are one of the most important elements in power electronics. With suitable timing of the switch instants, and suitable input and output filters, it can create a similar output voltage to the input. It contains 9 switches in a 3x3 matrix, to connect any phase to any other. There is an all electronic route directly from 3 phase AC at one frequency to another, it's called a Matrix Converter.
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FREE delivery Tue, May 2 on 25 of items shipped by Amazon. It's often accidents of history, or advantages to one or the other depending on local industries, or common components. ALITOVE AC to DC Converter 100V 240V to 12V 10A 120W Power Supply Adapter Car Cigarette Lighter Socket AC/DC Transformer for Car Vacuum Cleaner, Car Refrigerator and Other Car Devices. When two routes are possible, there is rarely a good answer for why one particular one was chosen. A six switch inverter is extremely versatile.
This limitation is fine for marine which typically uses 400Hz electrical supplies so generating 40Hz isn't too limiting for propulsion It, however, has a limitation of only being able to synthesise an output frequency around 1/10th of the input frequency.
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There is a variant of the matrix converter called the cycloconverter which uses thyristors and does not suffer the same issues as a full matrix converter. It converts alternating current (AC) to direct current (DC) using mechanical energy.
It is point #2 that makes the topology impractical as a simple loss of power will cause the inverter to blow up.
It also has the additional benefit of not needing any power passives (in theory), or no large capacitor, no large inductors. In theory it can take many phases in and produce many phases out at quite a wide range of frequencies. There is a type of converter which can do this: the matrix converter. Matin, 'Implementation of AC to DC Converters Using Thyristor in ATP', IOSR Journal of Engineering (IOSRJEN), Volume 2, Issue 11, PP 06-11, November 2012.
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