Title :
Line interharmonic currents in frequency changers
Author :
Graham, A. David
Author_Institution :
Stoyerman Controls Ltd., Twyford, UK
Abstract :
Harmonic studies of power rectifiers usually ignore the noninteger harmonics because there is no agreed method of either calculating them or measuring them. This paper shows one way of estimating the DC side current harmonics of a frequency changer and converting them to the AC line current harmonics with the aid of the current switching function. This method is extended to characteristic and noncharacteristic DC harmonics to enable the AC line current to be reconstructed including the integer and noninteger modulation harmonics
Keywords :
frequency convertors; power conversion harmonics; rectifying circuits; switching; AC line current harmonics; AC line current reconstruction; DC side current harmonics estimation; characteristic DC harmonics; current switching function; frequency changers; integer modulation harmonics; line interharmonic currents; noncharacteristic DC harmonics; noninteger modulation harmonics; power rectifiers; Commutation; Discrete Fourier transforms; Equations; Frequency estimation; Impedance; Inductors; Inverters; Power system harmonics; Rectifiers; Voltage;
Conference_Titel :
Harmonics and Quality of Power Proceedings, 1998. Proceedings. 8th International Conference On
Conference_Location :
Athens
Print_ISBN :
0-7803-5105-3
DOI :
10.1109/ICHQP.1998.760137
