717 publications from this institution
This paper discusses a distributed constant circuit model of power cables for representing high-frequency oscillatory currents, and evaluates electromagnetic interference (EMI) generated by a PWM inverter-fed induction motor drive system. While the lumped constant circuit model which has already been proposed by the authors has only one resonant frequency, the distributed model proposed here can simulate plural resonant phenomena existing in a high frequency range over the first resonant frequency. Frequency characteristics of both common-mode and normal-mode currents are analyzed by using a circuit simulator with the distributed model. As a result, it is shown experimentally and theoretically that the resonant phenomena in the high frequency range are originated from behavior of the power cables as the distributed constant circuit, and that the common-mode transformer (CMT) and the normal-mode filters (NMF's) can damp the resonances.
This paper considers the transient performance and stability of a recurrent discrete Fourier transform (DFT) based control method for a series active filter integrated with a 12-pulse diode rectifier. The control method targets specific harmonics and/or the negative sequence fundamental component of the supply current, and is intended for use with nonsinusoidal/unbalanced supply voltages. The proposed control method is based on DFTs instead of the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</i> -method, and a simple approach is used to account for small frequency variations found in practical power systems.
