The hottest power transmission and distribution te

2022-07-22
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Power transmission and distribution energy-saving technology promotes the development of power energy conservation. China's power consumption is second only to the United States, ranking second in the world. Among them, the inefficient utilization of power and the high power consumption per unit output value are the key factors affecting the power situation. Promoting power energy conservation has important strategic significance

recently, the national development and Reform Commission (NDRC) issued a plan to strengthen power saving, namely, the assessment plan for power enterprises to implement power demand side management objectives (for Trial Implementation), which stipulates that power savings in power transmission and distribution systems of power enterprises can be included in their own power savings. The implementation of this scheme will greatly mobilize the enthusiasm of power transmission and distribution system of power enterprises for power saving, drive the application of new energy-saving technologies, new materials and new equipment in power transmission and distribution system, and boost the development of energy-saving industry

as an important focus of power saving, the power transmission and distribution system has great potential for power saving. Just taking the reduction of line loss rate as an example, the annual power saving can reach about 40billion kwh for each percentage point reduction in line loss rate. The line loss rate in China is 7.7%, while that in the United States and Japan are 6% and 3.89% respectively. In this way, there is a lot of room for China to reduce line loss rate

UHV power transmission, smart power, improving distribution power factor and promoting energy-saving transformers are the main measures for energy conservation and consumption reduction in transmission and distribution systems. The National Engineering Research Center for power transmission and distribution and power saving technology (hereinafter referred to as the Engineering Center), as an important institution for power saving, has made great efforts to carry out the development of key technologies and devices for power transmission and distribution energy saving in recent years, so as to promote the national power company to build a resource-saving society. Requirements for the utilization of universal tensile testing machine fixture:

UHV power construction can greatly reduce the line loss of long-distance transmission, and complete the research and development of UHV series compensation device and UHV controllable shunt reactor, which is of great significance to the energy conservation of transmission and distribution system. Among them, the UHV series compensation device can greatly enhance the stability of the power system, improve the operation power, and then review the pressure of the oil return pipe and the voltage distribution along the line, so as to reduce the loss and realize the optimal allocation of resources in a wider range. On december16,2011, the UHV series compensation device was officially put into commercial operation, marking the successful development of the world's first UHV series compensation device

UHV controllable shunt reactor is an important equipment to solve the contradiction between overvoltage limitation and reactive power compensation of long-distance heavy load lines in UHV transmission system. It has the characteristics of optimizing reactive power distribution, reducing losses and improving the stability of UHV system. In 2011, the engineering center completed the development of the world's first set of key equipment such as high impedance transformer body and large capacity self cooling thyristor valve for UHV controllable shunt reactor, which has the conditions for demonstration application

flexible AC transmission technology in intelligent power construction is also one of the key technologies for transmission energy conservation and loss reduction, so as to identify the quality of data under dynamic load. In 2011, the engineering center also made significant progress in the research and equipment development of EHV flexible AC transmission technology. The mobile 100 MVA STATCOM key technology research project undertaken by the engineering center has passed the acceptance of the State Grid Corporation of China and reached the international advanced level. In addition, the 750 kV controllable high catalytic activity nano carbon based material and utilization technology shunt reactor of Dunhuang substation in Gansu Province have successfully passed all the test projects, and the voltage stabilization and reactive power compensation effects are remarkable

promoting renewable energy is also an important part of energy conservation and consumption reduction in power system. Flexible DC transmission technology can not only promote the integration of renewable energy, but also make the system more energy-saving and environmental friendly, and improve the quality of distribution power. On july25,2011, the Shanghai Nanhui wind farm flexible DC transmission demonstration project undertaken by the engineering center was officially put into operation, marking that the complete set design capacity of the flexible DC transmission system independently developed by the engineering center and the manufacturing capacity of core equipment such as converter valves have reached the world leading level

in terms of energy-saving technology, the engineering center has established an energy monitoring and management system based on reactive power optimization of enterprise distribution, which has finally achieved the goals of distribution power factor greater than 0.94, system energy efficiency greater than 90% and energy-saving rate not less than 8%, and has successfully passed the acceptance of the Ministry of science and technology. The project has been operated and demonstrated in Jinan Iron and Steel Co., Ltd. for more than half a year, and has achieved remarkable results in compensating reactive power, improving power factor, stabilizing voltage level and reducing system loss. This also indicates that the engineering center has mastered the core technology of comprehensive electrical energy saving in large industrial enterprises and promoted the application of energy-saving technology in China

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