双电压合成策略矩阵变换器开关模式的研究

Study on Switching Pattern of Matrix Converter Based on the Line-to-line Voltage Synthesis Strategy

矩阵变换器作为一种新型变频变压控制方案,其三相输出通过双向功率开关与任一输入相直接相连。通过一定的调制策略来控制这9个双向开关,从而得到期望频率和幅值的输出电压。调制策略的好坏直接影响矩阵变换器的输入输出特性,而开关模式的选取是调制策略的关键。在分析双电压合成策略的基础上,讨论了不同的开关模式对开关损耗、输入、输出特性以及双向开关换流可靠性的影响,并得出两边对称模式是一种优良的开关模式的结论。最后通过仿真和实验验证了结论的正确性。

As a new variable frequency and variable voltage control scheme, the three output phases are connected to any one of the three input phases by the bi-direetion power switches. The expected output voltage of certain frequency and amplitude can be deserved by controlling the nine bi-direetion switches with some kind of modulation strategy. The input and output characteristics of matrix converter depends on the modulation strategy directly and the selection of switching pattern is the key of modulation. Based on the line-to-line voltage synthesis method, the various switching patterns were discussed, as well as their influence on the switc- hing losses, input/output characteristics and the commutation reliability of the bi-direetion switches. Mean- while, the symmetrical pattern is the best among these switching patterns. Finally, the simulation and experiment results were given to verify the correctness of the conclusions.