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gui chao cable news: flexible hvdc technology ushered in the rapid development period
from：guichao author：admin click： 379 addtime：2017-04-08 17:08:52
because of china's large-scale renewable energy sources such as wind power,
solar energy and hydropower are mainly distributed in the three north area,
the load is mainly concentrated in central, eastern and southeastern regions,
thousands of miles apart. therefore,
development of ultra high voltage direct current transmission technology is an effective way to solve the problem of long distance and large capacity power transmission in china,
for china's regional integration and consumption of new energy,
multiterminal dc and dc grid technology will be an effective complement.
flexible dc is widely used in renewable energy,
in the field of dynamic reactive power compensation, there is no transmission distance restriction problem,
in addition, due to the use of xlpe dc cable, no environmental pollution problems.
for large city power supply, flexible hvdc transmission,
it can improve the fault isolation ability of the power grid, and will not increase the short circuit power,
transmission power can reach 1.5 times and above ac cable.
for the power supply of offshore drilling platform, flexible dc transmission has the ability to supply power to the passive system,
frequency conversion speed control function, the flow valve using modular design, on-site installation, short cycle.
in addition, the dc power grid can be independent and fast regulation of active and reactive power.
intelligent, stable ac / dc hybrid wide area transmission network with advanced energy management system.
it can be predicted that the next ten years will be the rapid development of china's flexible hvdc technology and construction,
the ac / dc interconnected power grid with strong cross links will be the basic form of china's power grid structure.
with the continuous improvement of the level of the switch off device and the dc cable,
flexible hvdc will become the most important transmission mode in the dc power system.
flexible dc project cost has been reduced to the same capacity of conventional dc 1.1~1.5 times,
as the loss is reduced to 1.4%, the capacity of flexible dc engineering is increasing,
into large-scale practical phase.
expected in 5 ~ 10 years, the world will be expected to build on the basis of flexible dc,
the main network is 500kv and above grade, 10gw and above the transmission capacity of the regional dc power grid.