Noise Source Identification for a ±800kV Converter Station Based on Beam-forming Acoustic Imaging Technology

In this paper, a beam-forming acoustic imaging technology is applied to identify the spatial position and frequency characteristics of the main noise source on the key position of a ±800kV DC converter station. The test results show that the main noise sources of the AC filter field are the reactor group and the capacitor group, the noise of the reactor group has obvious peak value at 600Hz, and the noise of the capacitor group has obvious peak value at 100Hz. The main noise of DC filter field is from the reactor. The main noise source in the converter transformer area is the cooling fan array arranged outside the transformer. The maximum noise of the water cooling system is generated by the spray water on the bottom water pan of the cooling tower.