UHV: When will the "AC-DC" Argument be Closed?

UHV Transmission Success Reports

In March, the 1000-kilovolt Jindongnan-Jingmen UHV AC pilot demonstration project passed the acceptance by the National Standardization Administration on the 26th. It is China's first national major project standardization demonstration project, marking the formation of the world’s first UHV AC transmission standard system.

This acceptance not only marked that China’s UHV AC transmission technology has become the world’s first set of standards, but also gave the most favorable practical proof of the development of AC transmission technology in China. In this UHV AC transmission project, there are 7 categories of UHV AC transmission standard system with 79 standards covering all aspects of system research, equipment manufacturing, commissioning test, and operation and maintenance. In 2010, it won the Chinese standard innovation contribution. First prize. At the same time, it also promoted the industrialization and standardization of UHV AC transmission technologies, which enabled China to seize the “commanding heights” of international UHV transmission technologies, enhance China’s discourse power in the formulation of international standards, and promote China’s UHV transmission technologies. And equipment to open up the international market.

Similarly, UHVDC transmission is also beneficial. At the 2014 Power Planning Development Forum held on April 2, the relevant person in charge of the National Grid did not evade the recent controversy over the construction of UHV lines. Instead, it disclosed five verticals. The latest planning progress of the 27 horizontal UHV lines. Article 27 of the UHV route planning to the economic development of the power equipment industry will also be able to imagine the economic revenue, the market will usher in a new round of outbreaks.

Even the news said that the top officials of the State Grid have already spoken and the UHV must be on this year. Wu Xinxiong, deputy director of the National Development and Reform Commission and director of the National Energy Administration, publicly stated that in order to reduce pressure on power generation in the eastern region, 12 cross-regional power transmission channels have been planned and constructed, including 4 UHV DC lines, 4 UHV AC lines, and 3 500 kV high voltage line.

Not only from the policy point of view can UHV's development this year, from the UHV's own technology development has also become an important boost to promote UHV construction, in 2014, China's UHV power grid approval once entered the fast lane, the future It will surely be a new round of industry outbreak.

The U.S. high-pressure dispute has not broken

Although achievements have been made in UHV AC transmission, the dispute over UHV has never stopped. Where is the focus of the controversy, we will first comb everyone again.

U.S. high-voltage is still not on, this dispute has continued for many years. One of the controversies lies in the safety and stability of technology; the other lies in its economy and necessity.

However, as the haze of the Beijing-Tianjin-Hebei region, the Yangtze River Delta, and the Pearl River Delta has become more and more serious in recent years, the main means of “treating the iron fist” have begun to shift to reducing the use of coal in the region. There is no controversy over electricity generation. From this perspective, the UHV is an inevitable choice. At present, the focus of debate is mainly on the UHVDC or AC UHV.

DC ultra-high voltage, in simple terms, is biased towards point-to-point power transmission, and AC ultra-high voltage has advantages in large-area mesh transmission.

At present, there are many domestic trials of DC UHV. Prior to this, China Southern Power Grid established a DC UHV for the purpose of sending clouds and electricity to the east. Cai Guoxiong said that China Southern Power Grid covers 20% of the country's territory and is also suitable for direct-current transmission from a geographical point of view. However, the national grid covers 80% of the area, and it will be transported from Tibet, Xinjiang, and Northeast China to North China, East China and Central China.

When will the U.S. U.S

Previously, industry sources stated that the 1000KV AC UHV transmission technology was in essence a retrogression. Ding Gongyang believes that China's practice in the past 10 years has further proved that the 1000KV AC UHV has low power transmission capability, huge investment, and extremely low economic efficiency. defect. And the exchange of UHV in the long-distance large-capacity transmission must be eliminated by the DC transmission technology, is one of the root causes of its loss of vitality.

Under the premise that smog continued to increase, UHV has been continuously put on an important development position. On February 12 this year, Premier Li Keqiang presided over the executive meeting of the State Council to study and deploy to further strengthen the governance of air pollution such as haze. The first major measure proposed was to speed up the adjustment of the energy structure, and implementation of cross-regional power transmission projects was one of its main contents.

The UHV power grid construction under the premise of controlling haze is on the one hand an urgent requirement for solving haze pollution, and on the other hand is an important test for the exchange of UHV. One side is to speed up UHV construction, and the other is opposed to the exchange of UHV construction. When will the U.S. high-pressure debate really get a draw?