1. In HVDC no corona loss is there as incase of HVAC.
2. For longer distance,HVDC system is very economical as compared to the HVAC system.
3. Allowing power transmission between unsynchronized AC distribution systems.
4. HVDC increases the capacity of an existing power grid in situations where additional wires are difficult or expensive to install.
5. For  DC  frequency is 0.Therefor there is no inductive reactance drop, result of it is improve voltage regulation.
6. There is no problem of stability as in AC.
7. There is no skin effect in DC.
8. AC require 3 wire for transmission but DC require only 2 .
9. There is no ferranti effect in DC{it doesnt  mean that capacitance is absent in DC,capacitance act as open CKT for DC}

• Power is generated from Synchronous machines (Alternators) which rotate at a particular speed called the synchronous speed given by

1. Number of poles in machine
2. Speed of machine

• Coming to your actual questions about transmission of power at high frequency , We need to realize the model of transmission line

1. Drop across inductor will increase as V = I*X =I*2*3.14*f*L (f being the frequency).
2. A higher drop will cause the line voltage to sag.Hence the coveted flat voltage profile will not be obtained.
3. The voltage will decrease with increase in length and  it will be  less most at the receiving end (where it is needed the most).
4. Corona loss is directly proportional to frequency, hence the losses due to corona will increase
5. This will cause more interference with communication/telephone lines.
6. High losses in transmission wires due to skin effect.
7. Because of skin effect , the cost of conductor material will increase  as the conductor is not utilized fully at high frequencies.
8. Economy of transmission is a major point while designing transmission lines . increasing the cost of conductor will make the system uneconomical
9. Since the resistance due to skin effect increases ( assume Rac=1.6Rdc), line losses (I^2R ones) will increase and hence the power transmission capability will decrease
10. FACTS devices or compensators will be required for reactive power demand/supply making the system even more costly.

1. We use a lot of power electronic devices. A high frequency will cause large switching losses.
2. Harmonics of higher frequencies being fed back to grid , filter requirements might be there.
3. Poor voltage regulation
4. Possibility of  thermal noise/shot noise /white noise (high frequency ) interference with home appliances

Fastest Internet in the World was launched at South Korea

South korea is about to launch the First 5G service- Fastest Internet in the World.

Fastest internet in the world launched at South Korea is to present a bursting quick 5g portable network access, enough to download a full length movie in under a second.
While a large portion of the world has yet to encounter the enhancements offered by 4g administrations, the innovatively exceptional nation has affirmed a £900million (1.6 trillion won) in its successor.
South Korea’s science service said it plans to execute the innovation, which is something like 1,000 times speedier than the 4g, inside six years.
5g will permit clients to download a 800-megabyte film record in one second, contrasted and 40 seconds utilizing 4g, the science service said, including that such speeds might help South Korean firms win abroad arrangements.
A service agent said: ‘We helped fuel national development with 2g administrations in the 1990s, 3g in the 2000s and 4g around 2010. Not withstanding the time it now, time to make preemptive move to create 5g and to create record for the Fastest internet in the World.

Competition for the Fastest Internet in the World :

Nations in Europe, China and the US are attempting forceful deliberations to create 5g engineering … what’s more we accept there will be wild rivalry in this business sector in a couple of years,’ it said.

Under the guide, a trial 5g administration will be taken off in 2017 and a completely business benefit in December 2020.
Necessity will be provided for creating key characteristics for the new system, including Ultra-HD and visualization transmission and also bleeding edge long range informal communication administrations.
Related businesses will have the ability to rack up offers of 5g-related apparatuses and base supplies worth 331 trillion won from 2020 to 2026, the service evaluated.
The administration wants to execute the arrangement with speculation and participation from specialists, for example, SK Telecom and Korea Telecom and in addition handset producers like Samsung and LG given support for the Fastest Service in the World.
It likewise plans to extend the telecom framework supplies industry, which is moderately weaker than the relentless versatile apparatus part.
Headed by Samsung – the world’s top handset producer – South Korea has a heading 30-percent stake in the worldwide portable unit market and tried much to provide the  Fastest Internet in the world
‘Anyway the (telecom) foundation gear industry has just a 4.4 percent experience the worldwide business sector, with fares extremely constrained,’ the service said.
Chinese gear creators including Huawei have extended their vicinity in the worldwide business from 12 percent in 2007 to 26 percent in 2012.
Huawei proclaimed in November that it was taking a gander at a 5g business rollout by 2020, with a base financing of $600 million to create the engineering.
Seoul means to consume to a 20 percent stake on the planet’s telecom base supplies showcase by 2020, consistent with the service to provide the Fastest Internet in the World.
New chances South Korea is famous for being at the front line of web engineering with broadband speeds that reliably out-pace those in Europe or the United States to provide the Fastest Internet in the World
Authorities said the new administration might likewise mean individuals on slug trains running speedier than 500 kilometres (310 miles) a hour might even have the ability to gain access to the Internet, contrasted and 300 kph right now.
‘Projectile prepares around the globe continue getting speedier, with some in China running as quick as 500 and 600 kilometres for every hour,’ said one service official who declined to be named.
‘In the event that we have the innovation to permit quick Internet gain access to in these trains, it can open new chances for us comprehensively,’ he said about the Fastest Internet in the World.
Samsung Electronics advertised back in May that it had effectively tried 5g innovation(Fastest Internet in the World), overseeing information transmission of more than one gigabyte for every second over a separation of two kilometres.
Samsung said it had figured out how to saddle millimetre-wave groups which have turned out to be a staying focus for the versatile business to date.
The test utilized 64 recieving wire components, which the tech titan said defeated the issue of ‘unfavourable proliferation attributes’ that have avoided information bridging long separations utilizing the groups.
Then again, it made clear that the innovation might not be accessible industrially before the finish of the decade and thus people of South Korea experience the Fastest Internet in the World.

I need feedback openion and comment to keep this topic alive.Thank You!