矩阵变换器变步长换流策略

Varying-Step Commutation Strategy of Matrix Converter

分析了传统四步换流及改进的四步换流策略的特点,以安全可靠换流和改善输出波形质量为目标,提出一种新的矩阵变换器变步长安全换流策略。该换流策略以电压法四步换流为基础,综合考虑了电压大小和电流方向,并据此划分了安全区域与不安全区域,在不同区域采用不同换流策略,既充分保证了换流可靠性,也减少了换流时间,改善了输出波形质量。最后,通过实验验证了所提出变步长安全换流策略的有效性与可靠性。

Aiming at safe commutation and improving quality of output waveforms,the paper presents a new varying-step safe commutation strategy of matrix converter by analyzing the character of traditional four-step commutation and improved four-step commutation strategy. With the input-voltage-based commutation this new strategy synthetically considers the magnitude of input voltage and output current direction and accordingly distinguishes the safe and the unsafe partition. Then different commutation strategies adopted in different partition which improving the reliability of commutation and decreasing the commutation time to improve the quality of output waveform. Finally,experimental results demonstrate the availability and reliability of varying-step commutation strategy of matrix converter.