This paper is concerned with the adverse effect of subharmonics generated by a pulsewidth-modulation-controlled voltage source converter supplying an ultrahigh-speed induction machine (USIM) and also with the calculation, simulation, and test of the subharmonic generation. It is mostly believed, except for a few publications, that the impact of subharmonics is negligible in most modern drives. Our finding is the contrary, i.e., it can cause significant additional losses that might lead even to breakdown in special cases like USIMs applied in systems developed for renewable and waste energy recovery. After a brief description of the system, the generation of subharmonics and the additional losses resulting from subharmonics in USIMs are discussed.
Bibliographical noteFunding Information:
Manuscript received September 1, 2009; revised May 13, 2010, July 28, 2010, and October 5, 2010; accepted November 15, 2010. Date of publication December 10, 2010; date of current version March 11, 2011. This paper was supported in part by the Hungarian Research Fund (OTKAK72338), by the Control Research Group of the Hungarian Academy of Sciences, by the Hungarian Science and Technology Foundation in the framework of IT-20/2007 project, and by the European Economic Area (EEA)/Norwegian Financial Mechanism—HU0121-GAN-00064-E-V1. This work is connected to the scientific program of the “Development of quality-oriented and cooperative R+D+I strategy and functional model at BME” project. This project was supported by the New Hungary Development Plan (Project ID: TAMOP-4.2.1/B-09/1/KMR-2010-0002).
- Harmonic analysis
- high-speed induction machines
- pulsewidth-modulated power converters