The Research On The Suppression Technology Of Active Harmonic Of The Grids Of Aircraft AC

With the rapid development of modern aviation and advances in technology, the power supply system of the aircraft also achieved continuous development. To meet the requirements of high-altitude, high-speed and large motorized flight, military aircraft’s main power system was dominated by low-voltage DC power system gradually into the AC power. Airborne equipment in the power supply module had non-linear characteristics, therefore, it resulted in harmonic pollution to the aircraft’s AC power system. Harmonic pollution seriously affected Aircraft AC grids and the quality of air power grid, and even caused the failure of the air power outage, seriously threatening the completion of the safety of aircraft and combat mission. So for military aircraft, it was very necessary to discuss the governance of the aircraft AC power system’s harmonic pollution.The problem of the pollution of power electrical equipment to the power grid had long been attracted attention in the industrial and civil field. In the past few decades, surrounding the issue, each country made a lot of theoretical and experimental research. In order to limit the harmonic pollution, Active Power Factor Correction (APFC) device urgently needed to be introduced into electrical equipments. In recent years, with the development of power electronic technology and power semiconductor devices, the technology was more and more attracted attention. APFC had been the favor of lots of scholars for its remarkable performance. The small total harmonic content and high power factor etc were the advantages of APFC technology. After electrical equipments using the active power factor to correct the circuit, the input current could track the change of the input voltage and the waveform was close to the sine. The technology got fully development and extensive application in the industrial and civil products.In this paper, on the basis of the analysis and testing of airborne equipment load characteristics, and respectively analyzed the changes of the harmonic in the single-phase and three-phase bridge rectifier circuit, with the input frequency, capacitor and circuit load changing. Then the paper introduced the composition and working principle of the Boost converter. The parameter settings of the main and control circuit were analyzed. Specifically the paper studied the airborne equipment power factor correction circuit under115V/400HZ conditions by simulation and testing to improve the aircraft AC grid quality.