Load characteristics
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Mainly air compressor, pump load. Load fluctuation is small, but the power factor is low, generally only about 0.8, the harmonic content to 5 times, 7 times, 11 times based.
There are a large number of pharmaceutical companies pump and motor load, and many are equipped with frequency converter. The large number of applications of the frequency converter makes the harmonic content in the distribution system greatly increased. Fermentation is one of the industries where frequency converters exist. It is an important link in the production of APIs. Therefore, fermenters are inseparable from this core. With the continuous expansion of product output, continuous updating of new processes and continuous improvement of new varieties Increase, on the fermenter control methods, mixing frequency and time adjustment and put forward different requirements. For heavy heavy load more, power consumption is relatively large, the fermentation cycle is relatively long, the fermentation in recent years, manufacturers also took a variety of ways, a lot of equipment, frequency control is the best that can meet Production process requirements, but also energy saving mode. Frequency converter in the fermentation tank on the increasingly popular application for the fermentation industry, industrial automation and control provides a good production and process benefits. However, with the continuous improvement of the degree of automation, the degree of contamination of the power supply by automation equipment is also getting deeper and deeper, and the corresponding interference to the automatic control system is also getting stronger and stronger. The requirements for filtering, purifying and obtaining a relatively stable green power supply Also higher and higher. As we all know, the inverter is a rectifier circuit, filter circuit, inverter circuit. Which rectifier circuit and inverter circuits are used in the semiconductor switching components, the control is used in the PWM control mode, which determines the inverter input, output voltage and current in addition to the fundamental, but also contains many high Subharmonic components. In addition to the lower harmonics that make up the reactive power loss of the power supply, there are many harmonic components at high frequencies. They will be in a variety of ways to spread their energy out of the formation of the inverter itself and other devices interfere with the signal. These higher harmonic components will cause distortions in the grid voltage waveform and create radio interference waves that adversely affect the surrounding equipment, including the drive motor of the frequency converter. At the same time due to the use of the inverter, the power supply voltage will produce higher harmonic components, will guide the power waveform deformity. Therefore, the power electronics represented by the frequency converter is one of the most important harmonic sources in the utility grid, which has an important influence on the power quality in the power system. Currently, the commutation of most inverters is the application of 6-pulse rectifier to convert AC to DC, so the resulting harmonics to 5 times, 7 times, 11 times the main. At the same time, pharmaceutical companies often have labs and automated production lines, and there are a large number of sophisticated devices that in many cases are both generators of harmonics and victims of harmonics. Harmonic wave will affect the normal work of equipment in the laboratory, making the ongoing experiment fall short; harmonics will also affect the automated production line intelligent controller, PLC system, so that automatic control equipment failure. In many national laboratories, pharmaceutical companies have automated production lines have Xiebo influence caused by equipment failure. Therefore, the pharmaceutical companies more profound impact of the harmonic problems, serious harm, in urgent need of governance.
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solution
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Selection of high-voltage automatic reactive power compensation complete sets of equipment, high-pressure side of reactive power concentrated compensation. Low-voltage side of the active filter configuration
