EMC issues of controlled rectifiers

Power electronic converters produce not only characteristic harmonics, but also both non- characteristic harmonics and interharmonics. This paper presents the physical background of both non- characteristic harmonics and interharmonics. Generation causes are explored and discussed in detail. Extensive series of simulation of different causes of harmonics arising have been provided and some of them are compared with experimental results and existing standards. This research offers missing background for standards covering low-frequency EMC.