| Mine hoists are important production equipment widely used by mining enterprises.The high-power impulsive load of the mine power distribution system causes low system power factor and severe voltage waveform distortion on the power grid,which affects the safety of the power grid and the stable operation of the hoist equipment.In view of the above problems,the harmonic control and reactive power compensation of the DC hoist in the 46-row auxiliary shaft of Jinchuan Group Co.,Ltd.were studied.The 46-row auxiliary shaft hoist adopts thyristor-DC motor(SCR-D)transmission mode for power supply.In this paper,active power filter(APF)and dynamic reactive power compensation(SVG)devices are used to perform harmonics on the 46-row auxiliary shaft hoisting system.Research on Filter Treatment and Reactive Power Compensation.(1)This paper introduces the problems of high voltage and current distortion rate,low power factor and serious harmonic influence in 46-row in the three mining areas.In view of the problem of harmonic pollution and reactive impact of 46-rowl distribution systems,the present situation and development trend of harmonic suppression and reactive compensation are expounded.The principle of dynamic reactive power compensation device and the principle of filter design are deeply analyzed.On the basis of comprehensive analysis,the program is optimized and designed,and the dynamic reactive power compensation program in practical application is proposed.(2)The original filter compensation device of 46-row can no longer meet the demand for use,in order to solve the power quality problem of 46-row distribution system,the principle of design and dynamic reactive power compensation of active filters is introduced,which provides the preferred basis for the 46-row harmonic control and reactive compensation equipment upgrading scheme.(3)Based on the analysis of the main problems of power quality in the mine distribution system,the theoretical study of power factor,current distortion,voltage fluctuation and other indicators is based on the principle of harmonic generation of the three-phase bridge rectifier circuit,and provides a method for the analysis of the power quality of 46-row.(4)The 46-row auxiliary shaft hoist and supporting electrical equipment in the third mining area are introduced in detail.Aiming at the power quality of the auxiliary shaft power distribution system,the research and analysis are carried out from the aspects of the hoist load characteristics,the power quality of the main incoming line,and the power quality of the rectifier and transformation.Based on the results of the test data,the power quality of the distribution system is analyzed to provide the best solution for harmonic control and dynamic reactive power compensation.(5)Based on the power quality analysis results of the 46-row auxiliary shafts in the third mining area,it is proposed to use active filter(APF)and dynamic reactive power compensation(SVG)to achieve harmonic control and reactive power compensation.According to the configuration plan,install APF and auxiliary shafts in the 46 auxiliary shafts SVG equipment,through the realization of the plan to test the power quality data after treatment,comparing the data before and after treatment,it is found that the power quality of 46-row of auxiliary shafts has been effectively improved.This research and analysis is useful for improving the safe and stable operation of mine production equipment Realistic meaning. |
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