Advantages and Disadvantages of High Voltage Inverter
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Author:lytrannet
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Published time: 2019-06-02
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The advantages of high-voltage frequency converter in metallurgy, chemical industry, power, municipal water supply and mining industries are widely used pump load, accounting for about 40% of the total energy consumption of electrical equipment, electricity costs in water plants and even 50% of the cost of water production. This is due to: on the one hand, equipment design, usually leave a certain margin; on the other hand, due to changes in working conditions, demand pump output different flow.
The advantages of high-voltage frequency converter in metallurgy, chemical industry, power, municipal water supply and mining industries are widely used pump load, accounting for about 40% of the total energy consumption of electrical equipment, electricity costs in water plants and even 50% of the cost of water production. This is due to: on the one hand, equipment design, usually leave a certain margin; on the other hand, due to changes in working conditions, demand pump output different flow. With the development of market economy and automation, and the progress of intelligence level, it is beneficial not only to improve the process and improve the quality of production, but also to save energy and economic operation of equipment to control the stop speed of pump load by using high-voltage frequency converter. Frequency converter is the inevitable trend of sustainable development. There are many benefits to stop speed control of pump load. From the application examples, most of the converters have achieved good results (some can save up to 30%-40%). The cost of water production in water works has been greatly reduced, the automation level has been improved. The converter is also conducive to the depressurization operation of pumps and pipe networks, and the leakage and tube burst have been reduced. The service life of the equipment can be prolonged.
The output voltage waveform is close to sinusoidal waveform by multiple PWM control. (2) Rectifier circuit with multiple pulses, high power factor and low input harmonics. (3) Modular design, compact structure, convenient maintenance and enhanced the interchangeability of products. (4) Direct high voltage output without output transformer. Very low dv/dt output, no filter in any way. Some of them use optical fiber communication technology, which improves the anti-interference ability and reliability of products. _The power unit automatic bypass circuit can complete the function of fault non-stop. With the rapid development of modern power electronic technology and computer control technology, the technical reactions of electric drive have been promoted. AC speed regulation replaces DC speed regulation, and computer digital control replaces analog control has become the trend of development. Frequency conversion speed regulation of AC motor is a main method to save electric energy, improve consumption process, improve production and quality, and improve operation environment. Frequency converter speed regulation is regarded as the best way out for its high efficiency, high power factor, excellent speed regulation and start-brake performance. In recent years, some new devices will change this situation, such as IGBT, IGCT, SGCT and so on. The high voltage frequency converter composed of them has excellent performance and can realize PWM inversion and even PWM rectification. Not only has the harmonic small, the power factor also has the very big level progress. The defect of high-voltage converter. When the control mode of high-voltage converter is in low frequency, because of the low output voltage, the influence of the stator resistance voltage drop on the torque is comparatively significant, which reduces the output torque. In addition, its mechanical characteristics are not as hard as DC motors, and its dynamic torque capability and static speed regulation performance are not satisfactory.
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