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Comparison of Peak-To-Peak Current Ripple Amplitude in Multiphase PWM Voltage Source Inverters
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| Author(s) |
Jelena LONCARSKI, Claudio ROSSI, Gabriele GRANDI |
| Abstract |
Multiphase systems are nowadays consid¬ered for various industrial applications. Numerous PWM schemes for multi¬phase voltage source inverters with sinusoidal outputs have been developed, but just recently the im¬pact of these modulation schemes on the output peak-to-peak cur¬rent ripple am¬plitude has been consid¬ered. Determination of cur¬rent ripple in multiphase PWM voltage source inverters is important for both de¬sign and control purposes. This paper gives the comparison of the peak-to-peak cur¬rent ripple dis¬tribution over a fundamen¬tal period for multiphase VSIs, starting from three-phase and extended to the multiphase inverters, with emphasis on five and seven phases. Simplified expres¬sions to get maxi¬mum val¬ue of the rip¬ple are carried out and compared among inverters with different phase number. Although refer¬ence is made to the centered symmet¬rical PWM, being the most simple and effective solution to maximize the dc bus utili¬zation, leading to a nearly-optimal modulation to minimize the rms of the current ripple, the analysis can be readily extended to ei¬ther discontinu¬ous or asymmetrical modula¬tions, both carrier-based and space vector PWM. The results obtained by the proposed analytical approach are backed with the numeri¬cal simulations of the peak-to-peak ripple for inverters with different phase numbers and in case of different modulation indexes to prove the effec¬tiveness of mathe¬matical developments. |
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| Filename: | 0893-epe2013-full-11033818.pdf |
| Filesize: | 457 KB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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