The frequency conversion speed regulation function of the inverter (hereinafter referred to as -VFD) is to convert the three-phase power frequency (50Hz) AC power supply (or any power supply) into a three-phase AC power supply with adjustable voltage and frequency. Variable frequency speed control devices, sometimes referred to as VVVFs, are mainly used to regulate the speed of AC motors (asynchronous or synchronous).
The role of VFD in energy conservation and power environmental protection
1. The AC motor frequency conversion speed regulation system is composed of three parts: AC motor and controller. Among them, the key core equipment is the VFD, which can achieve smooth changes in the voltage and frequency of the motor.
2. Frequency conversion speed regulation is incomparable with the previous voltage regulation, pole change speed regulation, cascade speed regulation, differential speed regulation, and hydraulic coupling speed regulation in terms of frequency modulation range, static accuracy, dynamic quality, system efficiency, perfect protection function, and easy to realize automatic control and process control. It is recognized as the most ideal and promising speed regulation scheme for AC motors, and represents the development direction of future electric transmission.
3. In the past 30 years, VFD speed regulation has been widely used in steel, metallurgy, petroleum, chemical, textile, chemical fiber, light industry, papermaking, rubber, plastics, electric power, water supply and other industries. The application of low-voltage motor frequency conversion speed regulation has been very popular and mature. The frequency conversion speed regulation of high-voltage motors is also being paid attention to and gradually applied. In addition to excellent speed regulation performance, AC motor frequency conversion speed regulation also plays an important role in saving electric energy and protecting the environment. It is an ideal speed regulating device for enterprise technological transformation and product upgrading.
Frequency conversion speed regulation of fans and water pumps is energy-saving
1. The contradiction between power supply and demand (short supply) The power gap is large and needs to be saved. According to the statistics of relevant departments, in 2002, China's installed power generation capacity was 31.9 billion kilowatts, and the annual power generation capacity was 1,346.6 billion kilowatt hours. Although the scale of electricity is the second in the world, the per capita electricity consumption is the lowest in the world. In addition, the rapid development of China's economy requires more electricity. In accordance with the requirements of 8% national economic growth and 11% growth of electricity, by 2010, China's installed power generation capacity should be 5700-600 million kilowatts, and the annual power generation capacity will reach 28000-29000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 In the summer of 2003, the continuous high temperature caused a shortage of power supply in some provinces and cities, and forced to take power rationing measures. The local power system is unstable because the power grid is overloaded. The above shows that China's electricity supply and demand are unbalanced, and the supply is less than the demand. Therefore, it is necessary to conserve electricity.
2. Energy-saving benefits of frequency conversion speed regulation of fans and pumps
(1) The total installed capacity of electric motors in China is 450 million kilowatts, accounting for about 65% of the country's power generation. Therefore, how to achieve motor power saving is very important. There are generally two ways to save energy of motors: one is to improve the efficiency of the motor and achieve long-term efficient operation, which is mainly used for constant speed machinery; The other is to improve the control accuracy of the motor speed, so that the motor runs at the most energy-saving speed.
(2) Fans, pumps, and compressors are motor-driven equipment, which are widely used in national economic production. The total capacity of the motor is 150 million, and the electricity consumption accounts for about 35% of the country's power generation, of which about 20% - 30% of the fans and pumps need to be adjusted.
(3) VFD speed regulation is the best energy-saving solution for fans and pumps. According to fluid theory, the shaft power of centrifugal fans and pumps is a power of three functions of rotational speed. The speed is reduced, and the power consumption is also greatly reduced. For example, at 50% rotational speed, the mechanical power of the shaft is only 12.5%. Of course, the efficiency of speed control schemes is quite different. After the slip, the efficiency of the hydraulic governor is not high, η≈ (1-s), at 50% speed, η vs≈ 50%, while the efficiency and efficiency coefficient of the inverter governor is higher, η VVF≈ 95% - 98%, and almost unchanged. Therefore, among the many speed regulation schemes, the energy-saving benefits of frequency conversion speed regulation are good, and it should be the best scheme.
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