Design On Vary Frequency Control Of Motor Speed System For Circulating Hydrogen Gas Compressor

Regular script in the national economy in many fields, especially in petroleum, chemical industry, metallurgy, refrigeration, food, pharmaceutical, fermentation, power, air, and other industries, centrifugal compressor has been widely used, is the production process is very important key type equipment, used to transport all kinds of process gas or mixed gas, through the impeller compression and improve its pressure, meet the follow-up process needs of the various working conditions of the gas. Along with our country petroleum chemical industry’s rapid development, to centrifugal compressor unit and centrifugal compressor unit much condition, variable speed control requirements also more and more high, and green energy saving also appears especially important.Therefore, in order to recycle hydrogen compressor integral form a complete set of high frequency control of motor speed control system must be able to ensure the safe and stable operation of compressor, and the best play compressor performance, compressor in the energy saving under the working conditions of for users to create the greatest benefits.This paper research content mainly includes the following several aspects:(1) analysis of the centrifugal compressor working principle, points out centrifugal compressor structure and high voltage asynchronous motor structure and explosion classification, for circulating hydrogen compressor frequency control of motor speed system design content established research target.(2) through the centrifugal compressor flow characteristics, control method and the joint operation of the network and the paper, a more comprehensive considering the compressor operation of possible problems. Considering the energy saving, through the coupler speed control and frequency control of motor speed contrast, determine the frequency converter speed control scheme to realize the control function of centrifugal compressor for flow and pressure control, to ensure that the compressor load meet the technological requirements.(3) according to the compressor shaft power to select motor capacity, and then choose the capacity of the frequency converter. Then explains the working principle of frequency converter and classification, then according to the compressor class load characteristic, through the multiple frequency converter production house factory products compared with each other, and finally determine the compressor selection Siemens perfect harmony high voltage frequency converter to complete the control function, and the frequency converter function, performance and application of the system is introduced.(4) Some factory circulating hydrogen compressor unit machine high voltage variable frequency speed regulation for design object, the completion of the high voltage variable frequency speed regulation system control logic design and control system design, and start-stop frequency inverter power supply the complete design.(5) for Siemens frequency converter operation panel function description, through the operation panel on the keyboard and display function, to complete the realization of the function of frequency control of motor speed, but can be by PC remote set speed given value to achieve frequency control of motor speed.