【摘要】 矩阵变换器是一种AC/AC直接变换器,电网的任何非正常输入将直接恶化其输出电压特性。文中基于SPWM矩阵变换器提出了一种前馈补偿方案。通过检测输入线电压包络,对参考正弦进行预调制,使得正弦脉宽调制输出脉冲在宽度上给予自适应地补偿。文章分析了补偿原理并介绍了实现方法。采用Matlab/Simulink对补偿前后的输出特性进行了仿真对比。分析和仿真表明该方案可以有效地改善矩阵变换器在非正常条件下的输出特性,验证了方案的有效性和正确性。该方案具有简单易行的优点,既便于硬件实现,又便于数字实现,而且计算量小。更多还原

【Abstract】 Matrix converter (MC) is a direct energy conversion device, which output characteristics and reliability will be degraded due to the abnormal inputs at the AC line side because of its lack of DC line elements. To improve its performance, a feed-forward control scheme based on SPWM matrix converter is proposed. Each pulse is compensated differently in width of SPWM by pre-modulation of reference sine waveform according to envelop of input line voltages. The compensation algorithm is simple and the control scheme is easy to be implemented by hardware. Analyze and simulation studies demonstrate that the proposed compensation scheme improve effectively the output characteristics of MC under abnormal input conditions.更多还原