Introduces the recent characteristics of inverter industry development in our country

by:V&T Technologies     2020-03-15
The inverter is power converter in the motion control system. Today's motion control system is contains a variety of subject areas of technology, the general development trend is: drive communication, the high frequency of power converter, the control of digital, intelligent and networked. Therefore, frequency converter as an important power conversion system components, provide controllable high performance variable voltage variable frequency ac power and got rapid development. After about 30 years of research and development and application practice, with the new power electronic devices and the application of high performance microprocessor and the development of control technology, the performance of the inverter is more and more high, more and more small volume, and factory continues to improve reliability of frequency converter to achieve further small, lightweight, high-performance, multi-functional and sanitary and making new efforts. Converter performance, depends on the output voltage harmonic of motor, the influence of the second, we must look for grid harmonic pollution and input power factor, the energy loss in the third, we need to look at itself ( The efficiency) How to? Here only in enormous quantity wide cross - straight - to pay inverter as an example, expounds the development trend of it: 1, the main circuit power switch components from shut off, the modularization, integration, intelligence, constantly improve the switch frequency, further reduce the switching loss. 2, inverter main circuit topology structure, the network side of the inverter converter device of low-voltage small capacity usually adopt six pulse converter, and to the middle of the large capacity device USES multiple over 12 pulse converter. Load side converter of low pressure small capacity unit often USES two level of bridge type inverter, and to the middle of the large capacity device adopts multilevel inverter. For four quadrant operation of transmission, in order to implement the converter feedback and save energy, renewable energy to the grid side converter should be reversible converter, at the same time, the power can be two-way flow of dual PWM converter, the network side properly controlled inverter can make the input current is close to sine wave, reduce the pollution of power grid. At present, the low and medium voltage inverter has this kind of product. 3, PWM control method of variable pressure transducer can be used in a sinusoidal pulse width modulation ( 变频调速) Control and eliminate the specified number of harmonic PWM control, the current tracking control, voltage space vector control ( Flux trace control) 。 The next page 12 >
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