The hottest UHV debate is over

The debate on "UHV" is not over.

although there are many voices around, the prospect of exchanging UHV projects this year is unclear

UHV has become a hot topic in the energy field at the national two sessions this year. CPPCC members from Shandong, Inner Mongolia, Ningxia and other provinces and autonomous regions have called for accelerating the construction of UHV

although there have been few newspapers about UHV for nearly half a year, there has been no silence. After 23 experts jointly opposed the exchange of UHV Sanhua power plan in 2011, on February 22, 2012, 25 experts, including Jiang zhaozu, former director of the fuel and Power Bureau of the State Development Planning Commission, Shen Gencai, deputy chief engineer of the Ministry of raw water and power, jointly submitted a report to the Party Central Committee and the State Council, and once again unequivocally opposed the plan

AC UHV sanhualian has planted an indefinite bomb for national major power outages. In an interview at home on March 11, Shen Gencai, 87, expressed his anxiety

sanhualian

according to the national power plan, by 2015, the electricity in North China, East China and central China will be connected through UHV AC frames to form Sanhua synchronous electricity with three vertical and three horizontal lines, and by 2020, the pattern of five vertical and six horizontal lines will be completed

however, this vision of Guodian was opposed by many old experts

this is not a power system. Five vertical and six horizontal are connected everywhere. This is a highway map. The power system should not be connected everywhere like this. Shen Gencai wrote in a letter to Liu Tienan, director of the national energy administration, in September 2011

what will happen to sanhualian

Bai Jianhua, deputy chief economist of the National Energy Research Institute, said in an interview with China Science Daily that the power system has been expanding both at home and abroad

at present, there are fewer and fewer faults in China's power system, and there have been no major power outages in recent years, which shows that there is no direct relationship between voltage level, system coverage and large-scale power outages. Bai Jianhua said

Bai Jianhua also told that even if an accident occurred, it would not affect a large area like burning a camp. There are switches everywhere on the lines and transformers, and there are many controls, "explained Christopher Wilson, senior vice president of ultrahigh polymers in the global business line of Solvay polymers. The control strategy can be isolated in case of failure. In addition, we have done a lot of simulation calculations after the power planning

safety question

for Bai Jianhua's statement, the former professor level senior engineer of the production department of the Ministry of electric power, CIGRE and IEEE members hold different opinions

there have been 23 major power outages in the world in history, and the United States is the most serious. Why is there only one occurrence in Taiwan in China? Because over the past 30 years, we have conscientiously implemented the guidelines for the safety and stability of power systems. According to the zoning principle, electricity is divided into six regions. The scope of each region is small, and DC connection is mainly used between regions, so that the failure of any region will not affect the adjacent region. Meng Dingzhong said

Meng Dingzhong said that sanhualian is to integrate the three regions into a super large region. Once an instability accident occurs, it will affect the whole region. In addition, the "guidelines" stipulates that it should be layered, that is, the highest voltage is radially connected to the lower, and the upper and lower levels cannot be connected through transformers to form an electromagnetic ring, which is the cause of China Central power accident in 2006. However, sanhualian needs a 1/500000 V electromagnetic ring, otherwise each circuit will not send 3million kW

he also pointed out that according to the guidelines, only by decentralizing the point-to-point transmission of external power supply to the load center can we prevent major accidents caused by line failure and load transfer. However, sanhualian has closely connected all power supplies, which completely violates the guidelines issued by government departments in 2001 and should be seriously implemented so far, and will once again embark on the path of blackouts in the United States

Shen Gencai also said that accidents can be prevented only by preventing in advance when planning electrical structures

there is also a problem of stability limit in AC power system. If the sent current exceeds the stability limit, it will immediately cause the power oscillation of the whole system, and the whole power will be cut off within two minutes. This is beyond human control. Shen Gencai said

in addition, Meng Dingzhong told China Science Daily that the instability oscillation that caused a major power outage was not caused by the fault tripping of oneortwo components. Based on the calculation of 500 ~ 600 branch components at all levels of sanhualian, if the calculation was based on the interlocking tripping of two components, the simulation calculation of 250000 ~ 360000 cases had to be done

we checked the report "Research on the construction of power receiving terminal of our current technology and production capacity can also meet the production of relevant customized products" issued by the Academy of electrical Sciences in June 2010, and only simulated the tripping of one or two individual components. It is impossible to take simple calculation as the basis of safety, because five, 11, or even 15 components have tripped in many major power outages in the United States, causing instability oscillation, Therefore, the instability of AC UHV sanhualian is difficult to simulate, analyze and evaluate, and it is also difficult to prevent and save. Meng Dingzhong said

is the west east power transmission unsustainable

although experts suggested that it should be based on regional power, the fact is that since last May, Guodian has implemented a comprehensive adjustment focusing on the decentralization of assets and the collection of powers in the four major regional power stations in northwest, northeast, East and central China

in the reportage "call on Yang Mingzhou and his nine submissions" published in 2010, Yang Mingzhou, a professor level senior engineer of the information center of the State Electricity Regulatory Commission, pointed out that the compulsory implementation of UHV AC by the state power company will technically weaken the dominant position of regional power companies. Because once UHV AC is formed, the whole country will be declared to be formed, and monopoly will form a barrier technically. The 500 kV frame of regional electricity must be separated and become distribution electricity. The regional electricity companies will be overhead, and the system mode of regional electricity companies and regional electricity market will lose their trust

in an interview with China Science Daily, Bai Jianhua said that from a worldwide perspective, there is no universal model of power system reform, especially in the stage of rapid development of China's power industry

in the future, the scale of cross regional power transmission in China will become larger and larger. There is no basic self balance in a region. This requires us to establish a large platform with nationwide power allocation, so that we can efficiently allocate all kinds of packaging bag energy based on plastic, kraft paper and whiteboard. Bai Jianhua said

Bai Jianhua said that by 2020, the ideal state of power transmission from energy rich areas to Sanhua power will reach 350million kW

however, the opinions of the experts interviewed by China Science Daily are different

it (referring to national household appliances) is only a carrier and cannot play a leading role. Ding Gongyang said

as for the increasing scale of cross regional power transmission mentioned by Bai Jianhua, Ding Gongyang believes that at a certain stage, cross regional power transmission is possible because of uneven development. But in the long run, most provinces in the country are energy deficient except the northwest region. And it is impossible to have large-scale power transmission and exchange between energy deficient areas

for example, the power generation of the Three Gorges power station is 18.2 million KW. At that time, central China could not absorb so much electricity, so it had to send electricity to East China and Guangdong. Now, the power consumption in Central China has reached 500billion kwh, and the power shortage is very serious. So we are also proposing to redistribute the power of the Three Gorges power station. Ding Gongyang said

Meng Ding pointed out that by 2050, China will rely heavily on nuclear power, and nuclear power stations are mostly built along the coast or near load centers. Wind power and solar energy should be dispersed, distributed, and used locally and nearby. In order to save energy and reduce emissions, the northwest should still transport coal far away and should not transmit electricity far away. In the future, there will not be a large number of power transmission from west to East, and the power transmission will be less and less

the electromechanical used by the company's tensile machine is Panasonic all digital exchange servo Electromechanical. The prospect of the 2012 AC UHV project is unclear.

from March 2 to 3, 2012, the State Grid Corporation of China held the 2012 AC UHV working conference in Hefei

Sun Xin, assistant to the general manager of the State Grid Corporation of China, made arrangements for the key work of the construction of the exchange UHV project in 2012, including Solidly Promoting the construction of the South Anhui east power transmission project (Huainan Shanghai exchange UHV demonstration project) under construction, and cooperating with the requirements of project approval, completing all the preliminary thematic evaluations of the Ximeng Nanjing, Huainan Nanjing Shanghai, Mengxi Changsha, Ya'an South Anhui UHV exchange project, Strive to start the construction of the project within 2012

a securities analyst who asked for anonymity told China Science Daily that the focus of exchange UHV this year should still be approval. The possibility of all four exchange UHV projects being approved is still relatively low, and it is likely that only oneortwo projects will be approved

the person further explained that, on the one hand, the dispute over AC UHV has not subsided. On the other hand, from the current projects approved by the national development and Reform Commission, such as Huainan to Shanghai, the route is relatively short and the demand is urgent

due to the high investment of each AC UHV line, the national development and Reform Commission is also cautious in approving the project, and will consider many aspects such as technology, energy institutions and economic benefits. The person said

this issue should be considered more systematically, not just from the perspective of one company. If we continue to accumulate through UHV technology, there is no end. He Jun said. (original poem cute)