The industry questioned UHV power grid: the United States, Japan and Russia have stopped only China built

The phenomenon of "electrical power" that broke out in some areas during the "electricity shortage" triggered discussions on the construction of an electric power transmission channel. The State Grid Corporation of China has used its influence to push its long-planned UHV line construction. In an interview, the reporter found that some regional power grid companies believe that the UHV is not better than the previous line in terms of economy and safety. The industry believes that behind the disagreement of this technology line is the game of interests between the State Grid and the regional grid.

On June 21, a person from East China Power Grid told the reporter that investment in the UHV AC project was too large. The planned investment in the three vertical and three horizontal UHV transmission lines exceeded 500 billion yuan, which is the input of the two Three Gorges Projects. “Compared with the 500-kilovolt power transmission line, it is economically debatable. Russia, Japan, and the United States have all stopped construction of UHV lines. Only China is building UHV.”

The source believes that the 500 kV EHV transmission line is a relatively good transmission line. "From the coal base in Huainan, electricity can be sent to Shanghai through the construction of a 500 kV line; Zhejiang is in short supply and Fujian is relatively affluent, and it is entirely conceivable to construct a Two 500-kV lines will be sent to Fujian from Fujian to achieve mutual adjustment between the two provinces."

The reporter learned from East China Power Grid that the annual investment in the power grid is about 300 billion yuan each year, and the investment in construction of UHV power grids is huge, which is bound to inhibit the construction of regional power grids. In addition, the controversy over the safety of UHV has also made some regional power grid users feel uneasy.

A Sanhua (North China, East China, Central China) area power grid official said in an interview with reporters that the use of AC ultra high voltage to connect the three major regional grids of Sanhua into a unified operating independent grid may affect grid security, and there is a large-scale power outage. Hidden accident. A senior industry official stated that there are differences between the State Grid Corporation and the regional power grid in the construction of a 500 kV line or an UHV line. In the final analysis, it is a game of interests. Some even think that the State Grid has strengthened the “nationwide network” through technical means and weakened it. The strength of regional power grids runs counter to the idea of ​​reform of the electric power system in 2002.

"The implementation of the UHV by the State Grid is to strengthen monopoly in the country and form a nationwide network, which may break the regional restrictions. This is inconsistent with the goal of developing the regional power grid identified by the State Council's 'No. 5 Document' in 2002." Senior power experts told reporters. In 2002, the State Council issued the "Electric Power System Reform Program" (referred to in the industry as "Document No. 5") and established the North China, Northeast, Northwest, East China and Central China Power Grid Corporations. As a result of these regional power grid company's business scope, the former National Power Company has a relatively large proportion of assets, and the State Grid Corporation of China is responsible for the establishment of the work.

The above-mentioned senior power experts told the reporter that the original idea of ​​the “Document No. 5” was based on regional power grids and cultivated the regional power market. However, since 2005, the centralized power of the State Grid Corporation has increased, and the responsibilities and powers of the regional power grid companies have greatly increased. Weakened, “a specific approach is that the State Grid Corporation will transfer the main operating assets of the regional grid company to the provincial grid company according to the principle of localization, so that the regional grid has no input without assets. In addition, the national grid will also manage some regional grids. Functionally received from the headquarters, and now many regional grid companies only have network transfer rights."

For such a situation, the reporter has been confirmed by the Northwest Power Grid, which does not oppose UHV construction. Due to the local surplus of electricity, the demand for electricity is not as good as that in the east, and the Northwest Power Grid supports UHV to build long-distance transmission of electricity. However, the Northwest Power Grid also admitted that the establishment of provincial power companies in the western provinces has weakened the strength of the Northwest Power Grid to a certain extent.

Due to the large number of queries, the national level has also been cautious in approving UHV projects. To date, only the Jindongnan-Nanyang-Jingmen 1000 kV UHV pilot demonstration project has passed acceptance. A person from the Planning and Development Department of the State Grid Corporation of China told the reporter that the approval cycle for UHV projects was very long and there was no approval for three to four years.