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UHV: an efficient and optimized allocation of resources in China. Over the past 40 years of reform and opening up, China has made great progress in economic and social development and gradually improved people's living standards. In this process, the power industry has also made remarkable achievements, and China's electricity has achieved the transformation from small to large, from weak to strong, from decentralized isolation to interconnection. With the continuous promotion of economic and social development and scientific and technological progress, first, according to the cathode materials, it can be identified as ternary materials, lithium iron phosphate, lithium manganate and other types. Zhang takes UHV as the backbone, and a strong and intelligent AC and DC interconnected power has gradually formed, playing a huge role in providing power security, optimizing the allocation of resources, and helping green development

from weak dispersion to National Union

achieving world leadership

the 20th century is called the electrical age, and electric power is an important driving force for social progress and development. The increasing demand for social development has promoted the development of power industry

the development of China's power industry started in 1882, and it is one of the earliest countries in the world to have electricity. However, due to historical reasons, until the reform and opening up, China's electricity was still weak and scattered as a whole, mainly in relatively isolated provincial electricity and urban electricity, with little interconnection, and many regions did not have electricity coverage, lagging behind the world's electricity development process

In 1978, the major decision of reform and opening up opened a new journey for China. Over the past 40 years, great changes have taken place in China, and the achievements of reform and development have attracted worldwide attention

a number of large hydropower stations and pithead thermal power stations have been built in succession. As an intermediate link, electricity needs to be upgraded synchronously

in May, 1979, the China Electric Power Industry Conference clarified the development idea of the electric power industry - Taking the road of connection

the benefits of the alliance can be seen from Wenzhou, Zhejiang Province at the beginning of reform and opening up

Wenzhou took the lead in setting off a wave of entrepreneurship in the country, which can be described as "every household runs a factory, and every household has no idle people". With the rapid growth of the individual economy with the family as the unit, the first peak of power construction in Wenzhou also came

In 1983, Cihu substation, the first 220 kV power transmission and transformation project in Wenzhou, and Taiwan linwen power transmission line were completed, and the power from East China power was sent to Wenzhou. Ren Debao, the former deputy director of Wenzhou Electric Power Bureau, once served as the director of Cihu substation. He said, "Cihu substation is a hub substation connecting Wenzhou electric power and East China electric power. The commissioning of the 220 kV Taiwan linwen power transmission and transformation project has played a key role in alleviating the power shortage in Wenzhou."

after that, all parts of the country followed the "Wenzhou model" to achieve economic take-off, and the development of electricity also accelerated

from 1981, when the first 500 kV EHV transmission line - Pingdingshan, Henan to Wuchang, Hubei power transmission and transformation project was put into operation, to 1989, when the first ± 500 kV EHV Gezhouba to Shanghai DC transmission project was launched, to 2009, when China's first 1000 kV UHV transmission line Southeast Shanxi Nanyang Jingmen UHV AC test demonstration project was completed, North China power and central China power are connected into a synchronous power...

looking back on the development footprint, since the reform and opening up, China's electricity has made a step-by-step progress, realizing the scale from small to large, the transmission capacity from weak to strong, and the electrical structure from isolation to interconnection

in November 2011, the ± 400 kV Qinghai Tibet connection project was put into operation, marking the basic formation of the national connection pattern except Taiwan. Zhangguobao, former deputy director of the national development and Reform Commission and former director of the national energy administration, once lamented: "this is a great century project. If you go to Tibet now, at night, the bakor street in Lhasa is brightly lit, which is no different from the big cities in the mainland."

over the past 40 years, with the efforts of generations of power people, the overall level of electricity in China has changed from "catching up" to "leading". Today, China has built the world's largest national interconnected power, with UHV AC and DC transmission lines with the highest voltage level in the world, and so far there has been no large-scale blackout accident like that in America and Europe

The 21st century is an Internet era with rapid development. Internet sharing is the core feature of this era, and people know the world without leaving home. Power networks also need to allocate resources more efficiently and quickly, like interconnection, to help economic and social development. It is an inevitable requirement of the development of the times to further improve the large-scale trans regional transmission capacity

in 2003, most regions of the country suffered from power shortage, which fully reflects the problem of "heavy power generation and light supply" and that the development of electricity still cannot meet the needs of economic development

in Zhejiang, where economic development has always been at the forefront of the country, this contradiction is very obvious. At that time, Zhejiang enterprises "closed three times and opened four times a week". Some enterprises chose to move out, and some enterprises simply closed down. The shortage of electricity is rooted in the strong demand for electricity, while the local primary energy is extremely scarce, and relying on the power construction in the province is far from enough. Zhejiang is not alone. The natural endowment of reverse distribution of power demand and energy resources has made the country face the dilemma of power shortage on a large scale

it is UHV that turns this dilemma in one fell swoop

in 2004, after full investigation and demonstration, State Grid Corporation of China proposed to build UHV, give full play to its advantages of long-distance and large-capacity power transmission, connect various large-scale energy bases in the Northwest with the main load centers in the Middle East, and put into operation in 2011 to optimize energy resources on a large scale

1000 kV Southeast Shanxi Nanyang Jingmen UHV AC test demonstration project was started in 2006 and completed in January 2009. From then on, the thermal power of North China can be sent to central China, and the hydropower of central China can be sent to North China during the wet season, with significant energy mutual assistance

the starting point of the project is Shanxi, a major coal province, with an annual output of more than 400 million tons of coal. How to change the coal consumption mode and maximize the benefits of coal resources is an important topic for Shanxi to change its development mode. "The development of UHV is not only in line with the needs of the national energy strategy, but also in line with the reality of Shanxi's transformation and leap forward, which is of great significance for the country and the people." In 2011, Shen Lianbin, then Secretary of the Party group of the Standing Committee of Shanxi Provincial People's Congress, said

in July 2010, the ± 800 kV Xiangjiaba Shanghai UHV DC project was completed and put into operation, marking China's entry into the era of UHV AC/DC hybrid power. In the summer of that year, East China experienced continuous high temperature, and the number of days with high temperature of 35 ℃ and above in Shanghai amounted to 30 days. This ultra-high voltage will send clean water and electricity to central China. It is the same as whether this electromechanical device can provide enough power to the relay experimental machine. It has been introduced into eastern China, providing strong support for ensuring that Shanghai can smoothly pass the peak of power consumption

since the 18th CPC National Congress, the construction of UHV projects has been further accelerated, the all China electricity Federation has been further strengthened, and the power transmission capacity across provinces and regions has been significantly improved. With the commissioning of key projects such as Harbin Zhengzhou DC, binjin DC, Nanjing Zhejiang DC, Xitai DC and Zhaqing DC, a large-scale energy allocation pattern of West to East power transmission and north to South power transmission has been formed across the country

at present, 21 UHV transmission projects of "8 AC and 13 DC" have been completed by the State Grid, with a trans regional and trans provincial transmission capacity of more than 140million kW. By the end of 2017, the total power transmission of UHV transmission channels had exceeded 900billion kwh

helping green development

it is very important to speed up the construction of export channels

after 40 years of reform and opening up, China has formed a strong smart electricity with UHV as the backbone, which can not only ensure the safe and economic operation of electricity, but also play a significant role in delivering clean energy and helping pollution prevention and control

the time went back to 2011, when the UHV project was not long in operation in China, and its safety and economy were questioned

"UHV transmission technology is a resource-saving and environment-friendly technology, which has the advantages of large transmission capacity, saving line corridors, reducing losses, saving engineering investment, improving system stability and so on." In 2011, Chen Weijiang, an expert in the field of high voltage in China and then president of Wuhan High Voltage Research Institute, said in an interview with the media. Wuhan High Voltage Research Institute has been studying UHV technology since 1985. After more than 20 years of basic research, UHV has entered the stage of industrial experiment, and its safety and economy have been closely demonstrated by the expert team

in the past decade, China's large power has maintained long-term safe and stable operation, and there has never been a large-scale power outage

"we have successively developed large-scale power system analysis software and large-scale all digital real-time simulation device. At present, our application software in power system planning, design, dispatching and operation has achieved self-control." Zhou Xiaoxin, an academician of the Chinese Academy of Sciences and honorary president of the Chinese Academy of electrical Sciences, said in an interview in September this year

nowadays, big power has not only achieved safe, economic and stable operation and optimized allocation of resources, but also played an increasingly obvious role in promoting the consumption of clean energy, helping to save energy and reduce emissions, and preventing and controlling air pollution

since 2005, China's renewable energy power generation has continued to grow rapidly. At present, the installed capacity of hydropower, wind power and solar power generation ranks first in the world, and the combined proportion of the three in the overall energy supply exceeds 35%. In the "Three North" region with the most abundant renewable energy resources, the total installed capacity of new energy currently exceeds 170million kW, which cannot be consumed locally alone

it is crucial to further step up the construction of export channels. Relying on large-scale power to transmit the electric energy of large-scale hydropower, wind power and solar energy bases in the West and north to the load center in the East and central China economically and efficiently will not only reduce the losses of new energy power generation enterprises, but also greatly reduce the local coal-fired emissions of the load center

the ± 800 kV Hami South Zhengzhou UHV DC project, which was put into operation in January 2014, is the first UHV DC transmission project to implement "Xinjiang power transmission", effectively promoting the intensive development of coal power, wind power and solar energy in Northwest China

Xinjiang new energy development Co., Ltd. is one of the power generation enterprises that benefit. In December 2016, the company's 220 kV guodianjingxia Dongfeng Power Plant II was put into operation. Fengwenxin, the deputy director of the field, was sincerely happy to mention "electric power to aid Xinjiang": "now there is a large market for Xinjiang's surplus new energy, and our electric energy can be sent more to all parts of the country."

according to the data, in 2016, "power assistance to Xinjiang" benefited 27 thermal power enterprises and 337 new energy enterprises in 13 prefectures in Xinjiang, increasing the average utilization hours of thermal power by 194 hours and the average utilization hours of new energy power generation by 27 hours

in early October this year, the ± 800 kV ikzhao converter station in etokeqian banner, Inner Mongolia was officially put into operation, and all six UHV projects of "three AC and three DC" in Inner Mongolia were put into operation. There are large thermal power and wind power bases in Inner Mongolia. Since 2014, China National Household Appliance Co., Ltd. has invested 30.3 billion yuan in Inner Mongolia, and has successively started the construction of "three alternating and three direct" UHV transmission channels, increasing the power transmission capacity of Inner Mongolia to 70million kW, which not only improves the income of power generation enterprises, but also effectively relieves the pressure of power supply exceeding demand in Northeast China

UHV has not only brought benefits to power generation enterprises in the western and northern regions, but also sent clean electric energy to the region, helping regional energy conservation, emission reduction and green development, John Vickers, the project manager of the eastern and central regions, pointed out in today's press conference

in recent years, the haze problem in the central and eastern regions has attracted much attention. In 2013, the State Council issued and implemented the "prevention and control of air pollution"

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