摘要
分析了基于双电压合成策略的传统四步换流的特点,以安全换流和改善输出波形质量为目标,提出了改进的四步安全换流策略.改进策略包括改变PWM脉冲顺序、采用变换流时间的四步换流策略以及基于双电压合成控制策略的简化PWM脉冲产生方法.改进的换流策略既充分保证换流的可靠性,也减少了换流时间,并设计了简化脉冲产生方法使得PWM脉冲形成更为简单.换流策略的改进使得输出波形质量得到了改善,消除了换流过程中存在的开、短路故障.并通过试验验证了改进安全换流策略的有效性与可靠性.
Aiming at increasing the safe commutation and improving the quality of output waveform, an improved safe commutation method based on two line voltage synthesis is presented by analyzing the character of traditional four-step commutation. The improved method includes exchanging the switching PWM sequence and introducing variable commutation time four-step commutation strategy. A simplified method of generating PWM pulse is presented on the basis of two line voltage synthesis strategy. Improved commutation strategy can improve the reliability of commutation, decrease the commutation time and simplify the generation of PWM pulse design. Improved commutation strategy can enhance the quality of output waveform and eliminate the fault of short circuit and open circuit. Finally, experiment results demonstrate the availability and reliability of improved commutation strategy of matrix converter based on two line voltage synthesis.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2008年第1期61-65,共5页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(60474043)
关键词
电力
矩阵变换器
换流策略
双电压合成
换流时间
四步换流
electric power
matrix converter
commutation strategy
two line voltage synthesis
commutation time
four-step commutation
