Some researchers told that HVDC is better transmission system .HVDC eliminates the problem of AC system as well as economical benefits ,on the other hand the initial cost of the FLAC(low frequency AC transmission )system is lower then HVDC System.
Dear Anand,
This is a very interesting question. I think it strongly depends on the transmission distance and the application (Offshore transmission, the interconnection between two asynchronous AC systems (50/60) Hz.. etc). I'm sure you will have many interesting answers below.
Best regards,
Youcef
https://www.researchgate.net/post/What_is_the_better_transmission_system_HVAC_or_HVDC
Conference Paper Comparative evaluation of HVDC and HVAC transmission systems
Conference Paper HVDC over HVAC Power Transmission System: Fault Current Anal...
Economy, Efficiency and Reliability are the main factor to be considered in transmission of bulk power from generating station to load area. With increased transmission voltage the current could be reduced and transmission of power would be more efficient and hence HVAC to EHVAC started with edvent in technology, and was good for medium and short transmission line. When power was needed to be transmitted for long dist, due to line capacitance the leakage current at EHVAC voltage, reduceses the efficiency considerably, and hence HVDC is the only solution, and is used with advent in semiconductor technology, and HVDC is more economical, efficient and reliable for long lines, for bulk power transfer. As power frequency could be considered as low frequency, it cold be considered as low frequency power transfer, more reduction in frequency would not give any considerable advantages, in economy, efficiency and reliability for medium and short transmission, hence EHVAC could be considered more economical and reliable than even HVDC...
Dear sir @youcef kemari ,Thank you so much for you wonderful answer. i get all the point which i have doubt.Thank you once again.
Regard
Anand.
Dear sir BHUPENDRA DESAI Thank you so much for giving such a wonderful answer, really this answer helps me alot to understand the basic ,fundamentals regarding HVDC &HVAC.
REGARD
ANAND.
Anand
Power is generated as SC system ( exceptio Photo voltaic...). For DC Transmission there is aneed to rectify and invert, this has a cost the Converter station.
For the same power DC line is less expensive than AC line and line losses are lower for DC.
Therefore the system cost (line+ losses + station) has a transiction point (break even point) about 1000 1400 km. below AC is bettewr, above DC is better. This is the key point.
This refers to Overhead lines long distance. For undersea or underground cable the distance is lower and AC cannolt be used for lenght grater than 200 km due to "line charging- capacitance).
The power flow is controlable in DC system and in condition that is not more economical sometimes is a better technical solution ( ex. interconnection between countris - see Europe)
we have been using AC system and HVAC system for the past 100 years. Now with the significant improvements in DC and the FACTS devices, Thyristors etc, the HVDC is becoming viable for long distance power transfer, the break even would be 700 kms and 1000 MW transfer which does not required reactive power compensation, requires less number of conductors and reduced losses. the greatest advantages would be to reduce the loop flows in the AC system if planned carefully. I think Germany is utilizing multi terminal HVDC systems effectively to mitigate the wind and solar variability.
I agree with Paramhesa and I have heard about multi terminal HVDC links for wind offshore parks. But still is the question related to economical or costs of investments?
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