Simulation test and analysis of vibration and noise of Dry-type Air-core reactor under wide frequency condition

With the continuous expansion of power grid scale and increase in voltage level, the radiation noise problem caused by substation and converter station equipment to the surrounding environment is becoming increasingly serious. In this paper, electromagnetic-structural-acoustic coupling simulation of a dry-type air-core reactor is conducted using simulation software. The magnetic field distribution, vibration characteristics, and noise propagation characteristics of the dry-type air-core reactor under broadband harmonic conditions are analyzed, and the magnetic field, vibration, and noise generated by it are studied, along with suppression strategies. The results show that when the reactor height is increased by 2 m, the over-limit area of magnetic flux density on the grounding grid can be reduced by 99.7%, and the standard limit can be fully satisfied when the reactor height reaches 4.1 m. When the insulation support height increases to 1.1 m, the average low-order natural frequency decreases by 76.48%. The noise reduction effect of the “vertical and concave” sound insulation cover is remarkable: the “concave” type achieves a maximum noise reduction of 17.63 dB(A) at 2000 Hz and effectively reduces the propagation range of high-sound-pressure waves. The optimization scheme proposed in this study provides a new approach for substation noise control and has important application value.