Analysis of the application of high-tech industry development electronic technology in power system Xiong Jiejia Huang Jialin (Foshan Nanhai Hualin Electric Appliance Installation Co., Ltd. Foshan 528211, Guangdong) The application of technology in power system engineering has successively researched many kinds of equipment. A brief analysis of some applications of electronic technology in power systems.
1 The role of power electronics technology in power systems optimizes electrical energy. We can use the power electronics technology to process electric energy, optimize electric energy, use electric energy reasonably, and realize the high efficiency, saving and optimization of electric energy usage. For example, the promotion and application of power electronic technology in many industries such as light industry papermaking, fan water pump, rolling mill smelting, induction heating, power involvement, chemical industry, industrial furnace, electric welding, electrolysis, etc. can achieve 10% -40% energy saving effect. At present, this energy saving measure has been promoted and applied in many places in China.
Transform traditional industries and develop emerging industries. According to the predictions of some developed countries, 95% of the electrical energy may be used again after being processed by power electronics technology in the future. Power electronics technology is a kind of strong electricity technology. It controls strong electricity through weak electricity. It is an important interface connecting electromechanical equipment and computers. It combines information processing and power processing, providing technical support for automation, mechatronics integration, and intelligence. It has created conditions for traditional industries and emerging industries to adopt electronic technology.
Promote the development of electromechanical equipment to high frequency. The development of power electronics technology in frequency conversion technology and high frequency has made electromechanical equipment break through the tradition of power frequency and develop towards high frequency. The volume of the electromechanical equipment is reduced, the speed of the electromechanical equipment is increased, the best working efficiency is achieved, and it can adapt to any reference signal with or without noise.
2 Application of power electronic technology in power system Hydropower. China's hydropower resources account for 14.3% of the world's total hydropower resources, which is relatively rich. Therefore, we can give full play to the advantages of hydropower resources and vigorously develop hydropower. According to predictions, China's hydropower generation will reach 300 million kWh by 2020. However, hydropower generation has a shortcoming, that is, the speed of the generator set will change with the changes in the head of the wet season and the dry season. The power electronics technology can solve the impact of head changes. When the power generation is running, the traditional DC excitation is converted into ultra-low frequency variable frequency AC excitation through power electronics technology. By using the change in excitation frequency to compensate for the unsteady change in the generator rotor speed, this can be used to ensure that the water head falls during the estimated water period. The hydro generator continues to generate electricity.
wind power. In the near future, wind power will become the third largest power source. China's wind energy resources are also very rich. Wind energy resources at a height of 10m have about 3.226 billion kW, of which 253 million kW can be developed and utilized. It is estimated that the total installed capacity of wind power in China will reach 30.15 million kW by 2020. However, the direction of the wind continues to change, and the effective power of wind power generation is proportional to the cube of the wind speed. To maximize the capture of wind energy, the blades of the wind turbine When the wind direction changes and the direction changes automatically, it is necessary to adopt variable speed constant frequency control technology. By controlling the constant frequency operation of the power converter, the parameters such as the phase and frequency of the power grid are consistent with the output power, and the power system and the power grid are adjusted in both directions. This solves the problem of uncertain wind direction of wind power generation.
solar energy generation. China's vast land is rich in resources, and its solar energy resources are also quite large. China's 2/3 land area has more than 2200 hours of sunshine hours, and the average annual radiation is about 5900M / m2. At present, China's solar energy resources are mainly distributed in the southeast and west regions. It is expected that China will install 100MW photovoltaic power generation during 2010-2020. Regardless of whether an independent or grid-connected system is used, when performing high-power solar power generation, the inverter with the maximum power tracking function must be used to convert the DC power generated by the solar array to AC power, which requires the support of power electronics technology.
The first is the application in DC transmission and light DC transmission. Because of its large transmission capacity, flexible control and regulation, and good stability, it is especially suitable for submarine cable transmission and long-distance transmission. Since the world's first crystal transistor converter was born in 1970, power electronics technology has been formally applied to DC transmission. Later, crystal converter valves have been widely used in DC transmission projects. The second is the application in flexible AC transmission. Flexible AC transmission technology is a transmission technology based on power electronic technology and modern control technology to quickly and flexibly adjust the voltage, impedance and phase of the AC transmission system. It came out in the late 1980s. Its equipment structure is relatively simple and the cost is low. Easy to control, greatly improving the stability of the power system. At present, this technology has been applied in actual power system engineering.
How to improve the power quality and strengthen the reliability of power supply is a problem that the current distribution system needs to solve urgently. Power quality control must not only meet the requirements of frequency, voltage, harmonics and asymmetry, but also be able to suppress various transient disturbances and fluctuations. The power electronics technology provides technical support for these. With the continuous development of power electronic devices, power equipment has also entered a period of rapid development.
At present, China is facing this severe energy situation challenge. Building a resource-saving society is our goal, and power electronic technology can effectively support electrical energy storage and peak and valley adjustment.
Due to the continuous changes in electricity consumption, the installed capacity of power generation should be prepared according to the maximum load, which will cause a reduction in the average utilization rate of the generator. We can use electronic technology to convert AC power at night into DC power and store it in a parallel combination of large capacitors. When power is needed during the day, we can use power electronics to convert the DC power stored at night into usable AC power. Improve the thermal efficiency of the system. In addition, we can also use high magnetic permeability motors to replace the previous ordinary motors, achieve power saving operation of the motors through frequency converters, reduce the motor no-load rate, and for small and medium-capacity fans and pumps, low-voltage frequency conversion technology can be used to save energy Large-capacity fans and pumps can use high-voltage frequency conversion speed regulation technology to save energy, and the energy-saving effect is very good.
The future will be an important period for greater breakthroughs and development in new technologies, new products and new applications for power electronics. Although we have made some achievements in the application of power electronic technology in the power system, compared with developed countries in the world, China is relatively backward in the development of power electronic technology.
Therefore, we must continuously improve our technology, track the world's advanced level, and make independent innovations, so that power electronic technology can be more widely used in various industries and serve us better.
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