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CALCULATION OF THE PASSIVE AND ACTIVE COMPONENT STRESS OF THREE PHASE PWM CONVERTER SYSTEMS WITH HIGH PULSE RATE
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| Author(s) |
Johann W. Kolar; Hans Ertl; Franz C. Zach |
| Abstract |
This paper treats the simplified purely analytical estimation of the stress of passive and active components of PWM converter systems. The approximation of the actual system behavior thereby is gained according to the generation of limit values or mean values, respectively. This is done by transition from a summation of the "local" contributions of the single pulse periods (related to the interval center) to the integration of a quasi-continuous time function of equal local power loss. The latter function is gained via shifting the pulse interval through the period given by the (voltage or current) fundamental period. A modification of the phase modulation functions allows furthermore the minimization of the harmonic losses on the AC side. (This minimization is immediately clear after transformation of the system variables into space vectors). When compared to harmonic optimal modulation methods known so far the optimization given here results in considerably lower current harmonics rms values in the upper modulation region. Therefore it is especially well applicable to the control of PWM rectifier systems. As the comparison of the approximate solutions and of the results of a digital simulation shows, already for relatively low converter switching frequencies (low compared to the output frequency) a good consistency of the results is given. Therefore, the relationships derived can be applied immediately for the dimensioning of converter systems using FETs, BTs or IGBTs. |
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| Filesize: | 826.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-10 by System |
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