一种提高矩阵变换器电压增益的空间矢量调制法

与传统的电压源型逆变器相比,矩阵变换器主要的缺点之一是在输入及输出电流为正弦时,输出输入电压传输比限制在0.866。为克服此缺点,在传统的矩阵变换器空间矢量调制方法的基础上,提出了一种提高电压增益的调制策略,进行了详细说明,概念清楚、控制简单,不需要复杂的数学计算。此调制策略没有使用零矢量,较传统方法换流数量减少,输出输入电压传输比提高到0.95以上,但输出电压及输入电流波形出现了一定程度的畸变。通过仿真证实了理论分析,也显示了此调制策略的优缺点。

Method to Enhance the Voltage Transfer Ratio Based Space Vector Control of Matrix Converter

The main disadvantage of the matrix converter is the voltage transfer ratio is limited to 0.866,as sinusoidal input/output currents,compared with conventional voltage source inverter.In order to enhance the voltage transfer ratio,a method which enhances the voltage transfer ratio based on conventional space vector control of matrix converter was proposed.The process modulation for matrix converters with a indirect space vector control approach was explained fairly legible,and because of it's simple control algorithm to avoid complex mathematical operation.The forming of input/output waveform without using zero vectors,it enables to reduce switching times compare with conventional space vector control strategy,the output/input voltage transfer ratio can be increased to upwards 0.95.But,it leads to the distortion of waveform input current and output voltage at a certain extent.Simulation results verify the theoretical analysis and the advantage and disadvantage is showed.