The hottest power transmission and transformation

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The power transmission and transformation technology upgrading industry has entered the intelligent era

[introduction: not long ago, following the discussion on the future development trend of the power generation equipment industry, the China Electrotechnical Society also organized an Expert Symposium on the future development strategy of power transmission and transformation equipment in Beijing.]

the increasing demand for electricity, energy conservation and emission reduction, the adjustment of power supply structure, the development of power security and power market, the new construction of power facilities, the renewal and transformation of old equipment, and the application of new technologies will promote the continuous development and change of power transmission and transformation technology

then, where will the technological development of power transmission and transformation equipment go in the future

is it intelligent? Flexible transmission? Or high temperature superconducting technology

not long ago, following the Symposium on the future development trend of the power generation equipment industry, the China Electrotechnical Society also organized an Expert Symposium on the future development strategy of power transmission and transformation equipment in Beijing

intelligent electric technology is emerging.

to explore the development direction of future power transmission and transformation technology, we should first pay attention to what the future electricity will be like. Xiao Liye, director of the Institute of electrical engineering, Chinese Academy of Sciences, has a clear view

he believes that with the continuous development of renewable energy, the pattern of primary energy dominated by renewable energy and terminal energy dominated by electricity will become a reality in the future. This major change in the energy system will bring major challenges and serious impacts to electricity. The development of new technologies, such as information technology, communication technology, new material technology and energy storage technology, provides technical support for coping with these major challenges

therefore, Xiao Liye believes that intelligent electricity using modern information technology, new material technology, energy storage technology and new electrical organization structure and operation mode can accommodate the access of new energy systems on a large scale and realize optimized adaptive interaction in all links of electricity. It can be said that smart electricity and clean energy complement each other and are indispensable. Smart electricity can also be called future electricity or next generation electricity

Shi Zuming, a professor level senior engineer of Shanghai electric power transmission and distribution group, holds basically the same view. He said that the focus of future energy is energy efficiency, renewable energy, energy storage and plug-in "ocean clearing". The team plans to launch such system electric vehicles from the coastline of the San Francisco Bay area within a few weeks. These solutions will rely on smart electricity. Therefore, smart electricity is the foundation of sustainable energy in the future

intelligence has become a new trend in the development of electricity in the world. Given that the development of smart electricity plays an important role in ensuring energy security, improving energy efficiency, improving energy structure, coping with climate change and improving service levels, some countries have incorporated it into their national energy strategies, and some have taken it as an important measure to deal with the current international financial crisis. Wang Gang, a professor engineer of Henan PingGao Electric Co., Ltd., said

he believes that it is feasible to take UHV and smart electricity as the main trend of power development in the future, both conceptually and practically. The future development strategy of power transmission and transformation equipment should also be based on UHV and smart electricity

in fact, intelligence is one of the most frequently used words in the symposium that day. Wu Wei, deputy general manager of TBEA Co., Ltd., also gave his own view that the future technology of power transmission and transformation equipment manufacturing enterprises should develop in the following directions: first, ultra-high voltage, second, intellectualization, third, energy-saving and environmental protection equipment, and fourth, system integration technology, to intensive development

flexible transmission technology has broad prospects

based on the development concept of large power supply in the future and the power supply pattern formed by the development of new energy, Liu Dongsheng, deputy chief engineer of Tianwei BaoBian Electric Co., Ltd., believes that in addition to AC and DC UHV equipment technology and intelligent transmission and transformation equipment technology, the future development direction of transmission and transformation equipment technology also includes light DC or flexible transmission technology, low-cost and low loss equipment new technology

the so-called flexible AC transmission system is a transmission technology based on the application of power electronics technology and modern control technology to flexibly and quickly adjust the impedance, voltage and phase of AC transmission system

Shi Zuming said that the flexible AC transmission system technology is called the product of the second silicon initiated revolution of the power system in foreign countries, followed by the gold silver system control technology. It can be called one of the frontier topics with revolutionary influence in the modern power system. It has a wide range of applications from EHV transmission series compensation, static var compensation to power quality control technology and equipment of distribution system

he believes that in order to improve the transmission capacity of China's transmission lines and improve the stability and safety of the system, the focus of the promotion and application of flexible AC transmission technology in China is the series compensation technology, including the promotion and application of fixed series compensation and controllable series compensation. At present, flexible AC transmission equipment, such as active power filter, fast switching switch, dynamic voltage restorer and so on, has been applied in the power distribution field after the completion of most of Lamborghini's R & D work

with the expansion of power transmission scale, the increase of power transmission capacity at the receiving end and the increase of landing points, there is an increasing demand for voltage support and dynamic voltage stability devices of the receiving end system, which requires that static var compensation and advanced static synchronous compensation devices will also be widely used in a wider range. Shi Zuming further said that static var compensation is the first domestic product and has been popularized and applied

As one of the high-tech technologies with strategic significance in the 21st century, high-temperature superconducting technology, which can be widely used in the fields of energy, information, medical treatment, transportation, national defense scientific research and national defense industry, has also been widely mentioned

it is understood that the superconducting power equipment mainly researched and developed abroad at present mainly includes high-temperature superconducting cables, superconducting fault current limiters, superconducting energy storage devices, superconducting transformers, superconducting motors and high-temperature superconducting synchronous generators for reactive power compensation

Shi Zuming said that HTS cable has large current carrying capacity, low loss and small volume, and the transmission capacity will be 3-5 times higher than that of conventional cable. With the increasing power load in big cities, the penetration of high-voltage overhead lines into urban load centers is affected by many factors, and it is often necessary to use underground cables to transmit power to urban load centers. In this case, the use of high temperature superconducting transmission cable has obvious advantages, which is an important way to solve the problem of large capacity and low loss transmission

since the 1990s, the United States, Japan, Denmark and South Korea have successively carried out research on superconducting transmission cables. China has also made outstanding progress in the development of superconducting cables

the efficiency of superconducting motor can be increased by 0.5%~0.8% compared with conventional motor, the weight of the whole machine can be reduced by 1/3~1/2, and the single machine capacity can reach more than one million KVA. Shi Zuming, for example, said that according to the prediction of American superconductor company, if the 10 MW direct drive generator is manufactured with traditional technology, its weight will reach about 300t, while the 10 MW Generator manufactured with superconductor technology weighs only about 120t

because the superconducting energy storage coil is almost lossless, compared with other energy storage systems, the superconducting energy storage has a conversion efficiency of up to 95% and a reaction speed of up to a few milliseconds. In order to remove the damage layer generated during polishing as soon as possible, because of this, the superconducting energy storage device can not only be used to adjust the peak and valley of the power system, but also be used to reduce or even eliminate the low-frequency power oscillation of electricity, so as to improve the voltage and frequency characteristics of electricity. In addition, it can also be used to adjust reactive power and power factors to improve the stability of the system. Shi Zuming said

with the development and application of the second generation of superconducting materials, the application of superconducting technology and superconducting power devices is bound to make a new leap. He said

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