Solid State Transformer

They are being installed in London as part of a flexible LV network

Do you have any report or any kind of written information that I can show to my teachers? I will be very thankful to you.

Actually I googled about this and I didn't get any information . Even there is no prototype available on internet about solid state transformer

First, learn how to search.

I googled "power electronics transformer" and got about 1,090,000 results (0.75 seconds)

So, go back and do some real research instead of asking others to do the search for you.

Lyn , there are only research papers available for this topic. There is no hardware implementation available or there is no video available for this .. you can google it ..

" you can google it .."

So can you.

How to Search the Internet Effectively | MediaSmarts

<Beam me up Scottie>

From my knowledge, conventional transformers are less expensive and more reliable. It's hard to beat the reliability of wire and iron. Conventional transformers are also highly efficient (~99%).

https://www.pes.ee.ethz.ch/uploads/tx_ethpublications/__ECPE_SST_Workshop_2016_SST_Concepts_Challenges_Opportunities_FINAL_JWK_270116.pdf

(See page 14).

I studied this report already .. but the thing is I want to know . Did anyone do some work on this project?

I agree 50/60Hz transfo is simple iron, insulation and copper and very reliable.

When I started electronics, most radios had thermionic bottles/tubes and heavy 50 Hz transfos. Televisions were more "advanced", the kilovolt 50 Hz transfos of the first TVs were avoided by series cathode heaters and EHT for picture tube from flyback of a small "iron dust" core 10 kHz line scan transfo.

When the PC computer came along, the standard "200 watt" PSU was switch mode, with isolation by 25 kHz & up ferrite transfo, a small lump in the box.

Now, even the smallest "plug-top" PSU has a 100 khz plus isolating transfo preceded by bridge rectifier to DC and followed by rectifiers for DC output. All this gear is very reliable.

Copper is becoming scarce and expensive, so DC-DC can cut out a lot of cost, as well as size and weight.

I can understand power distributers being interested by

1. Running existing cables with DC for 40% more transfer at lower loss [DC at peak voltage of AC service & same current].
2. Smaller, lighter equipment in substations allowing higher power in existing space with quick-change wheel-in,wheel-out modular additions/replacements and standby parallel capacity.
3. Being able to control direction and magnitude of power transfer between points - the ordinary transfo is two way and power transfer is tied inherently to a small % voltage difference from no-current between ends.
4. Being able to transfer between existing substations when needed, even if phase/voltage difference makes hard connection impractical.

I just bought an electronic ballast for a fluorescent light tube - it is rated for DC input 176 – 280 V (lamp start ≥ 198 V DC) as well as AC 198 – 264 V 50/60 Hz.

So the bits for the DC Home are already "commodities".

https://innovation.ukpowernetworks.co.uk/innovation/en/

everything i found is on paper. i cant find any prototype or any hardware on internet .. if you can provide me with some hardware knowledge

Pick up the phone or email the UK people doing this. See my comment above.

There are little needs for them as AC-AC units. As correctly pointed out above by others, this is for special applications where the frequency needs to be changed or a conversion to (or from) DC is needed. Think solar, wind...

Modern airplanes use them to save weight but they are often coupled with other functions.

In our field (water treatment, see diagram below) we use large power electronics converters (G11, G12) to feed the ozone generators (10kW to 2.5MW). We transform the line voltage (380-480, 3 phases) into a high voltage medium frequency (~1500Hz) using a "smaller" transformer (T13) not shown in the picture below. We cannot do without as some galvanic isolation is needed between the load and the line. Look up www.ozonia.com for application details.

I have been doing power electronics for Imalog for 20 years and implemented hundreds of industrial applications. I was never asked to simply step up or down the line voltage with a power converter. That would have been a waste of money. As already pointed out by others, power converters shine when the electricity waveform needs to be transformed. In simple AC voltage conversion, the good old magnetic transformer is usually the best choice.