DIGITAL QUASI-RANDOM MODULATED SFAVM PWM IN AN AC-DRIVE SYSTEM

被引：15

作者：

PEDERSEN, JK

BLAABJERG, F

机构：

[1] Aalborg University, Institute of Energy Technology, Department of Electrical Energy Conversion, DK-, 9220 Aalborg East

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 1994年 / 41卷 / 05期

关键词：

D O I：

10.1109/41.315270

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A main research topic in PWM-VSI inverter-driven electrical machines is to reduce the generated acoustic noise which often is dominated by a multiple of the switching frequency in the inverter. This paper proposes a modulation scheme for reducing the acoustic noise effect from an AC-machine which can be implemented digitally for low and high performance systems. The scheme is based on a Stator-Flux Asynchronous Vector Modulation (SFAVM) imposed by a digital band limited PWM white noise generator for varying the switching frequency randomly. The white noise generator can be used for 8-, 16-and 32-bit microcontrollers. The modulation strategy is tested in a 1 kVA high performance 16-bit microprocessor controlled ac-drive system. Voltage-spectra on the line-to-line voltage and the acoustic noise spectra are presented and show that the new modulation strategy can decrease the noise effect. The stator-flux-polygon and the line current are measured and demonstrate the random modulation strategy. Finally, the total sound pressure level from the ac-machine is investigated with fixed switching frequencies and with different randomly modulated frequency spans. It is concluded that a properly chosen fixed switching frequency has the lowest total sound pressure level. However, the random modulation strategy distributes the noise frequencies and the noise is more comfortable and less annoying.

引用

页码：518 / 525

页数：8

共 13 条

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