How to apply power drag automatic control system to realize green sustainable development

1, power system automation technology overview of the power system consists of power generation, transmission, substation, power distribution and electricity and other links. Generators, transformers, switches, and transmission lines and other equipment called the primary equipment of the power system, in order to ensure safe, stable and reliable operation of the primary power equipment and power production to run in a more economical way, it is necessary to carry out on-line measurement and control of the primary equipment, protection, scheduling control, etc., the power system will be measured and controlled by these devices, protection devices, communication equipment, all levels of the grid scheduling and control centers. Power system will be these measurement and control devices, protection devices, communication equipment, all levels of power grid scheduling control center computer system, (thermal) power plants, (water nuclear energy, wind energy) power stations and substations, computer monitoring system, collectively referred to as the power system of the secondary equipment, which covers the power system automation of the main technical content.1.1 power grid scheduling automation 1.2 substation automation 1.3 power plant decentralized measurement and control system 2, the current power system automation relies on the development of IT technology, an important hot spot of the technology currently Power system automation depends on electronic technology, computer technology to continue to develop the main hot spots are: 2.1 power primary equipment intelligent conventional power primary equipment and secondary equipment installation sites are generally separated by dozens of meters to hundreds of meters away from each other with a strong signal power cables and high-current control cables connected to each other, while the power primary equipment intelligent refers to the primary equipment structural design considerations will be part of a conventional secondary device Or all the functions of the primary equipment structure design considerations will be part of the conventional secondary equipment in situ to achieve, save a lot of power signal cable and control cables, usually briefly described as a device with measurement and protection functions. Such as the common "intelligent switch", "intelligent switchgear", "intelligent box-type substation" and so on. The main problem of power primary equipment intelligence is that the electronic components are often subjected to high intensity electromagnetic field interference caused by the field of large current on and off, the key technology is electromagnetic compatibility, power supply of electronic components and external communication interface protocol standards and other technical issues. 2.2 Power primary equipment on-line condition detection of the primary equipment of the electric power system, such as generators, steam turbines, transformers, circuit breakers, switches and other equipment, important Long-term continuous online monitoring of operating parameters of power system primary equipment such as generators, turbines, transformers, circuit breakers, switches and other important equipment can not only monitor the real-time operating status of the equipment, but also analyze the trend of changes in a variety of important parameters to determine whether there is a precursor to failure, so as to prolong the maintenance cycle of the equipment, improve the utilization rate of the equipment, and provide a guarantee that the electric power equipment is overhauled from regular maintenance to condition maintenance. In recent years, the power sector has invested a lot of power and universities, scientific research units or the introduction of technology to carry out online condition detection technology research and practice and made some progress, but due to the technical difficulties, specialization, detection of harsh environmental conditions, to develop a satisfactory product will take some time. 2.3 Photoelectric Power Transformer Power transformers are indispensable and important equipment in the transmission line, its role is to press a certain proportion of the transmission line to the transmission line, and the power transformer will be used in the transmission line. A certain proportion of the transmission line will be the high voltage and high current value down to the standard value can be measured directly with the instrument in order to use the instrument to measure directly. The disadvantage is that with the voltage level of the insulation is more difficult, the greater the volume and quality of the equipment; signal dynamic range is small, resulting in current transformer saturation phenomenon, or signal distortion; transformer output signal can not be directly with the microcomputerized measurement and protection equipment interface. Therefore, many developed countries have successfully researched a new photoelectric and electronic transformers, the International Electrotechnical Association has issued a standard for electronic voltage and current transformers. Domestic colleges and universities and scientific research units are stepping up research and development and achieved promising results. Currently the main problem is the material with the influence of temperature coefficient and stability is not ideal. Another key technology is that the photoelectric transformer output signal than the electromagnetic transformer output signal is much smaller, generally milliamperes level, can not be like electromagnetic transformer can be sent to the measurement and control and protection devices through the longer cable, the need to be converted into digital signals in situ through the fiber-optic interface to send out the analog-to-digital conversion, photoelectric conversion, and other electronic circuitry part of the structure needs to be integrated with the transformer design. The electronic circuitry such as analog-to-digital conversion and photoelectric conversion needs to be structurally integrated with the transformer. Here, electromagnetic compatibility, insulation, environmental conditions, electronic circuit power supply is also one of the technical difficulties. 2.4 Adaptation of photoelectric transformer technology of the new relay protection and measurement and control devices power system using photoelectric transformer technology, the secondary equipment related to it, such as measurement and control equipment, relay protection and other devices, the structure and internal function of the structure and the function will be greatly changed. First of all, the device eliminates the internal isolation transformer, )* + conversion circuit and part of the signal processing circuit, thus improving the response speed of the device. But need to solve the important key technology to meet the needs of numerical calculations related to the data from different transformers how to realize synchronous sampling, followed by efficient and fast data exchange communication protocol design. 2.5 The development of secondary equipment in the ultra-high-voltage power grids in the late Tenth Five-Year Plan, in response to the economic and social development of the demand for electric power, power grids, the pace of scientific and technological progress in enterprises. In the late Tenth Five-Year Plan, in response to the demand for power for economic and social development, power grid enterprises have accelerated the pace of scientific and technological progress. In the field of ultra-high voltage, which represents the highest level of power transmission technology in the world today, the feasibility study of the State Grid Corporation's Jindongnan, Nanyang, Jingmen ultra-high voltage test and demonstration project has passed the review in late - month, and is expected to start construction by the end of the year, the ultra-high voltage transmission voltage of the test and demonstration project is 1,000 KV. In addition, China's South China Grid is also ready to build an 800 KV Yun-Guang ultra-high voltage direct current transmission line. line. The primary and secondary equipment for the UHV transmission lines need to be re-developed or imported from abroad. The main technical key point of developing UHV transmission secondary equipment is the solution of UHV grid stability control technology and field equipment electromagnetic compatibility, anti-interference ability, insulation and other special problems. 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