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It is understood that China's large-scale renewable energy is mainly distributed in the three northern regions, while the load is mainly concentrated in central, eastern and southeastern China, which are far
apart.
Therefore, the development of UHVDC transmission technology is an effective means to solve the problem of long-distance large-capacity power transmission in China, and multi-terminal DC and DC power grid technology will be an effective supplement.
Flexible DC is widely used in renewable energy grid-connected and other fields, and it has no transmission distance limitation problem, in addition, due to the use of XLPE DC cable, there is no environmental pollution problem
.
For large-scale urban power supply, the use of flexible DC transmission technology can improve the ability to isolate grid faults without increasing the short-circuit power of the system, and the transmission power can reach 1.
5 times or more
than that of AC cables.
In addition, the DC grid enables independent and fast regulation
of active and reactive power.
Intelligent and stable AC/DC hybrid wide-area transmission network
with advanced energy management system.
The next ten years will be the rapid development stage of China's flexible HVDC transmission technology construction, and the AC/DC interconnected power grid with strong AC and DC interconnection will become the basic form of
China's power grid architecture.
With the continuous improvement of the manufacturing level of switchable devices and DC cables, flexible DC transmission will become the most important transmission method
in DC power grids.
It is expected that within 5~10 years, a regional DC power grid
based on flexible DC, with a backbone network of 500kV and above, and a transmission capacity of 10GW and above will be built worldwide.
It is understood that China's large-scale renewable energy is mainly distributed in the three northern regions, while the load is mainly concentrated in central, eastern and southeastern China, which are far
apart.
Therefore, the development of UHVDC transmission technology is an effective means to solve the problem of long-distance large-capacity power transmission in China, and multi-terminal DC and DC power grid technology will be an effective supplement.
Flexible DC is widely used in renewable energy grid-connected and other fields, and it has no transmission distance limitation problem, in addition, due to the use of XLPE DC cable, there is no environmental pollution problem
.
For large-scale urban power supply, the use of flexible DC transmission technology can improve the ability to isolate grid faults without increasing the short-circuit power of the system, and the transmission power can reach 1.
5 times or more
than that of AC cables.
In addition, the DC grid enables independent and fast regulation
of active and reactive power.
Intelligent and stable AC/DC hybrid wide-area transmission network
with advanced energy management system.
The next ten years will be the rapid development stage of China's flexible HVDC transmission technology construction, and the AC/DC interconnected power grid with strong AC and DC interconnection will become the basic form of
China's power grid architecture.
With the continuous improvement of the manufacturing level of switchable devices and DC cables, flexible DC transmission will become the most important transmission method
in DC power grids.
It is expected that within 5~10 years, a regional DC power grid
based on flexible DC, with a backbone network of 500kV and above, and a transmission capacity of 10GW and above will be built worldwide.
