After rapid development in recent years, the amount of renewable energy in Gansu reached the second in the country. Among them, Jiuquan City, located at the western end of Hexi Corridor, Gansu, can develop more than 40 million kilowatts of wind resources and an available area of ​​nearly 10,000 square kilometers. Gansu proposed the strategic goal of "building a wind power corridor in Hexi and rebuilding the Three Gorges on the west." In this "big fast" situation, the issue of new energy consumption and delivery is particularly prominent.

Extra-high pressure delivery channel became the main delivery

According to the data of Gansu Power Grid, Jiuquan's 10 million-kilowatt-class energy base has approved and carried out preparatory work for a total capacity of 23.06 million kilowatts of installed power, of which 9.66 million kilowatts are for coal and 13.4 million kilowatts for wind power. With the construction needs of Jiuquan wind power base, Gansu Province has completed the preliminary work of large thermal power projects such as Jiuquan Suzhou Power Plant, Wuwei Thermal Power Plant and Jinchang Thermal Power Plant.

It is expected that by the end of 2013, Gansu Province will have installed electricity of 35.49 million kilowatts, of which 8.23 ​​million kilowatts of hydropower installed capacity, 16.08 million kilowatts of thermal power, 10.88 million kilowatts of wind power and 300,000 kilowatts of solar power. However, the maximum load of Gansu power grid is only about 1705 million kilowatts. The above shows that the local consumption capacity is far from meeting the power supply capacity, which requires strengthening the delivery capacity of the outgoing channel.

Jiuquan Energy Base Phase II 3 million kilowatts of wind power will be put into operation by the end of 2013, when Gansu wind power installed capacity will reach 10 million kilowatts, of which Jiuquan area of ​​958 kilowatts. After the second channel between Xinjiang and the Northwest is put into operation, Jiuquan has two 750-kilovolt channels to the main network with a transmission capacity of about 7 million kilowatts. Considering that the main grid power in Xinjiang is 4 million kilowatts, the wind power in Jiuquan can not be guaranteed to be sent out. Limit output of about 2.67 million kilowatts (equivalent to 425 million kilowatts of wind power installed capacity). At the same time, the peaking capacity of Gansu Power Grid can not meet the requirements of peak operation of wind farms, power consumption can not be absorbed in the province, wind will send contradictions will be further highlighted. Jiuquan wind power to address the second phase of the pressure on the grid to adapt to the sustainable development of wind power in Gansu, Jiuquan million kilowatt-class wind power must be sent through the UHV project can be fundamentally resolved.

Jiuquan new energy delivery to add a new channel

In April 2011, two Gansu and Hunan provincial government signed a "framework agreement to the power transmission Gansu, Hunan," Hunan clear need to receive part of a foreign power to meet the electricity needs of rapid economic development, by UHV transmission and transformation electrical drive construction, can Sending surplus electricity from Gansu, such as the new energy base of the 10-million-kilowatt wind power base of Jiuquan to Hunan, has a positive impetus to the two provinces in realizing complementarities and common development.

Jiuquan - Hunan UHV transmission line is undoubtedly tailored to the Jiuquan renewable energy delivery.

Reporters learned from the State Grid, Jiuquan - Hunan DC project a total investment of about 26 billion yuan, the line from the Jiuquan wind power base to the central Hunan straight line distance of about 2,000 km, ± 800 kV UHVDC transmission mode, the rated delivery capacity of 7.5 million kilowatts .

From the perspective of the receiving party, from 2015 to 2020, the electricity shortage in Xiangdong Power Grid is 347-4.78 million kilowatts, and the power gap in southern Hunan Power Grid is 3.45-610 million kilowatts, basically meeting the needs of the line.

Wind and fire tied to solve the wind power send technical problems

Wind energy is intermittent, fluctuating and random. From the perspective of the annual output of wind power, the output of wind power in most parts of China shows the characteristics of spring, winter and smaller in summer and autumn. From the characteristics of sunrise power, the output of wind power in China is mostly smaller during the daytime load peak, After midnight load trough larger period, showing significant anti-tune peak characteristics. Large-scale wind power access to power system FM peaking has posed a serious challenge. Therefore, a good power supply structure and sufficient backup capacity are the basis for wind power consumption. Wind power development objectively needs a certain amount of flexible power supply to be matched.

Wind fire bundling is the relative optimal choice of wind power DC delivery. China is a country lacking in oil and gas, and hydropower resources in the western and northern regions are strained. The bundling of wind power with oil and gas sources is not in line with China's resource conditions and the cost is relatively high. The western and northern regions are rich in coal resources and are capable of simultaneously developing large-scale coal-fired power and wind power bases. The focus of coal power development will be adjusted to the west and north, leaving the market space in the central and eastern regions. Without increasing the total coal power in the country, implementing wind and fire bundling can speed up the development of the wind power industry and optimize the power supply structure.

According to relevant technical documents, according to the premise of meeting the peak load balance of the system, the principle of maximizing the installed capacity of wind power should be considered and a reasonable proportion of wind and fire bundling should be considered. China's large-scale wind power base wind bale DC delivery reasonable ratio is generally 1: 1.5-1: 2.2. According to the proportion of wind and fire bundled to 1: 1.5 to calculate, through the Jiuquan to Hunan UHV DC transmission of wind power scale of 5 million kilowatts, which requires supporting thermal power installed capacity of 7.5 million kilowatts.

This reporter learned from the Gansu Provincial Development and Reform Commission, supporting the Jiuquan new energy base 8.4 million kilowatts peak-load thermal power project has been included in the State Grid Corporation of power construction planning, has built 2 × 330,000 kilowatts of cogeneration, Datang 803 plant 100,000 Kilowatts, Yumen hydropower plant 123000 kilowatts three projects, Shenhua State Power Suzhou plant 2 × 600,000 kilowatts, Gansu electric power plant Gualazhou Changle Power Plant 2 × 100 million kilowatts two peak-load thermal power project demonstration work has been reported National Energy Board.

The technical characteristics of UHVDC transmission make it become an important way for large-scale wind power outsourcing. From a technical and economic point of view, wind and fire tied UHVDC is the strong support for the development of new energy. (Jia Yuanpei)

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