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Improved performance of a single-phase to three-phase converter using a 4-switch Quasi Z-source inverter

机译:使用4开关准Z源逆变器的单相至三相转换器的性能得到改善

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This paper proposes an improved space vector pulse width modulation (PWM) control method for a 4-switch single-phase to three-phase converter using a Quasi Z-source (QZs) network that can be utilized in induction motor drive applications. Without using any extra filtering circuits, this method can work well to reject the effect of DC-link voltage ripple on the inverter output voltage, which can be accomplished by either power supply or voltage variations in the 4-switch structure. This closed-loop control strategy recognizes and senses any unbalanced voltage that occur across two split capacitors and by applying the changes in the vector's activation interval time, the three-phase output voltage can be balanced. In traditional methods, the DC-link voltage without ripple is often achieved at the expense of larger DC-link capacitors that lead to a bulky and heavy DC-link filter with slow response and increase in cost. The simulation results of the proposed control method demonstrate its efficiency and the potential of the structure to be further developed.
机译:本文提出了一种改进的空间矢量脉宽调制(PWM)控制方法,该方法适用于使用准Z源(QZs)网络的4开关单相至三相转换器,该方法可用于感应电动机驱动应用。在不使用任何额外滤波电路的情况下,该方法可以很好地抑制直流母线电压纹波对逆变器输出电压的影响,这可以通过电源或4开关结构中的电压变化来实现。这种闭环控制策略可以识别并感测两个分离电容器之间出现的任何不平衡电压,并且通过应用矢量激活间隔时间的变化,可以平衡三相输出电压。在传统方法中,通常以较大的直流母线电容器为代价来实现无波动的直流母线电压,这会导致笨重且笨重的直流母线滤波器,响应速度慢且成本增​​加。所提出的控制方法的仿真结果证明了该方法的效率以及该结构有待进一步开发的潜力。

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