| Airport is an important component of modern transportation,and the safety of its power supply system is a basic guarantee for the normal operation of airport.Taiping Airport is an important aviation hub in northeastern provinces which plays an important role in civil aviation airports.However,the phenomenon of switching failure due to harmonic pollution once happened,which is a safety hazard.So the harmonic control of its power supply system cannot be delayed.The power supply system of Taiping Airport was analyzed and evaluated in this paper,and the navigation light system with more serious harmonic pollution was selected as the main research object.Though testing and analyzing the power quality and harmonic characteristics of the No.1 navigational lighting system,the paper found that the system has high current harmonic distortion rate,large harmonics,low power factor,insufficient power utilization,and the three-phase imbalance of the lighting station system was severe.In this paper,the property harmonic control scheme was analyzed and demonstrated,and APF was selected as the harmonic control method of the No.1 navigation light station.Variable loop hysteresis loop control was proposed to overcome the on-off frequency changing large problem of fixed loop hysteresis loop switch.The principle,structure and circuit design of the improved control method were explained.Simulation model was established for the hysteresis control before and after improvement.Through simulation comparison,it was found that the effect of new control method was obviously improved,and the accuracy of the compensation current was also improved.For the Taiping Airport No.1 navigational lighting system,the property APF and installation nodes was selected reasonably.The effect of harmonic control was tested in this paper.The test results showed that the current distortion rate was significantly reduced,the power factor was obviously improved,and the three-phaseload unbalance problem of the system was also alleviated. |
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