| Abstract |
HVDC systems with thyristor converter technology do, due to their fundamental design and modulation, generate a disturbing acoustic noise emission in the vicinity of the converter station. The energy of acoustical noise is concentrated to a few distinct frequencies and the
psychacoustical impact is serere. Acoustic noise reduction is usually achieved with mechanical isolation, which is rather expensive due to the high voltages involved. In this paper a method is proposed, where the modulation strategy is altered to spread the acoustical energy in a wider spectrum, thus creating an acoustical noise similar to the soughing sound of the wind. Other consequences arc reduced need for filtering of distinct frequencies and a slightly reduced dynamic capability of the current control loop. The method is applicable also for other systems involving the
same kind of converter technology, like DC drives. |
