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Xinhua:China Constructs UHV DC Projects with World's Biggest Transmission Capacity to Solve the Imbalance of Energy Distribution
Xinhua, Urumqi, May 13th (Reporter: Xiong Congru, Liu Bing, Wang Wen).
On May 13th, the ±800kV UHVDC Transmission Project from Hami in Xinjiang to Zhengzhou in Henan started its construction in the wide-open gobi in the east of Xinjiang. Upon completion by 2014, it will set a new record of transmission capacity in the world.
"Energy distribution in China is rich in the west and the north while short in the east and the south, thus China needs trans-regional transmission."Director General of National Energy Advisory Committee, Zhang Baoguo said,"UHV Transmission Project can meet the energy demand with imbalanced energy distribution."
Hami is rich in coal in western China, and Zhengzhou is a hub city for energy exchange in central China. According to the constructor, SGCC, the 2,210-km-long line goes through Xinjiang, Gansu, Ningxia, Shaanxi, Shanxi and Henan, with a total investment of 23.39 billion yuan. It is designed to have a transmission capacity of 8GW upon completion in 2014, setting up a new world record.
Xinjiang is an important base of energy supply and reserve in China, with over 2 trillion tons of coal reserves, accounting for 40% in the whole country. Hami's coal reserves account for 1/3 of Xinjiang, and is also one of the seven 10GW wind power bases.
SGCC President Liu Zhenya said the Hami-Zhengzhou ±800kV UHVDC Transmission Project would take advantage of its high voltage to transfer the local abundant coal and wind power into electricity and transmit power to central China. It could ease the power supply tension in mid China, improve Xinjiang's self-developing capabilities, reduce 317 thousand tons of sulfur dioxide emission and 267 thousand tons of nitrogen oxides emission, effectively ease the pressure of air pollution, and save a lot of land resources.
Executive Vice President of Xinjiang Electric Power Company of SGCC, Sarahmu Mamat explained the so-called Ultra High Voltage (UHV) refers to the voltage levels of 1000kV or above in AC, and ±800kV or above in DC. Currently, the main grids of most grids in China use the voltage level of 500kV.
The Second Xinjiang-Northwest Main Grid 750kV HVDC Transmission Line started construction at the same time as the Hami-Zhengzhou ±800kV UHVDC Transmission Project. With an investment of 9.56 billion Yuan, the 2,180-km-long line will become an important channel for transmitting the wind power and solar power in Gansu Jiuquan, Xinjiang Hami and Qaidam area in Qinghai upon completion, and promote resource accommodation in a larger scale.
In recent years, the electricity shortage has become increasingly intense in certain areas throughout China, which is the main impetus for choosing long-distance and high power transmission. Since March 2011, several provinces and municipalities such as Zhejiang, Hunan, and Chongqing, have been running short of supplies of electricity and coal reserves. Later, China Electricity Council said that this was the most severe electricity shortage in China since 2004, with unprecedented effects and wide range. A conservative estimate of electricity supply is 30GW short in the whole country.
Deputy Director of SGCC DC Construction Department Ding Yongfu said that the development perspective of thermal power in eastern China is very limited. Thus it is necessary to transmit power in a large scale from the energy bases in the west and the north via trans-regional grids. However, the trans-regional transmission capacity has long been insufficient; the abundant power in the northeast and northwest could not support the eastern and the central regions. For a distance over 1000km, UHV is the most suitable technology for trans-regional transmission, featuring low energy consumption.
For the resource-abundant provinces such as Xinjiang and Inner Mongolia, UHV is a pivotal way to transmit power and build energy bases. While for the central and east provinces which lack electricity, UHV has become the biggest expectation to alleviate power supply stress.
As early as in 2009, China's first UHV transmission line-1000kV Jindongnan-Nanyang-Jinmen UHV AC Project was put into operation successfully, and was expanded again at the end of last year. Now the project's single-circuit transmission line capacity has reached 5GW, which means China’s UHV long-distance transmission technology matures gradually.