Fixed-Slope Carrier Modulation for Indirect Matrix Converter

• Main Authors: Yen-Wen Chen, 陳彥文
• Other Authors: Tzung-Lin Lee
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/7qu94x

碩士 === 國立中山大學 === 電機工程學系研究所 === 106 === When it comes to AC/AC conversion, AC/AC converters that have a dc-link capacitor to be an energy buffer between two ac systems and regulate dc-link voltage are commonly used. However, this capacitor affects life and volume of the converter device and requires soft-start circuit to prevent excessive inrush current. In recent years, with the innovation and development of power electronics, indirect matrix converter was proposed; this topology is more complex in modulation, but no drawbacks that caused by a dc-link capacitance. In this thesis, a carrier-based modulation method is proposed to implement zero current commutation (ZCC) in an indirect matrix converter (IMC) with a fixed-slope carrier. This method reduces the difficulty of producing switching signals that follows ZCC by modifying reference signals of carrier-based PWM method that needs a varying-slope carrier. The modified reference signals can then be used in PWM processes with a fixed-slope carrier. Moreover, there is no jump discontinuity in the modified reference signals, which can avoid abrupt changes in control that cause switching errors. At the end, the feasibility of this method is verified by experiments as input power factor correction, output frequency limitation test and output load variation.