A Parallel Matrix Converter System
A Parallel Matrix Converter System
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DOI：
10.1109/pesc.2006.1711881
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发表时间：
2006-06
影响因子：
2.2
通讯作者：
H. Ayano;H. Inaba;S. Ogasawara
中科院分区：
文献类型：
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作者：
H. Ayano;H. Inaba;S. Ogasawara
提出了一种大规模矩阵变换器系统，该系统将两个主电路并联，并且每个主电路的载波相位差为180度。矩阵转换器需要LC滤波器，这不仅是因为LC滤波器用作减少由转换器切换引起的高频纹波的常规滤波器，而且还因为LC滤波器的电容器用作虚拟电压源。因此，该滤波器必须连接在输入侧。该系统可以消除LC滤波器，因为流入LC滤波器的电流的谐波仅包含载波的偶数次谐波，并且可以提高LC滤波器的截止频率。例如，当截止频率加倍时，LC滤波器的电感器或电容器可以减小到1/4。通过仿真从理论上验证了提高滤波电流频率的原理。此外，在所提出的系统中，输入电流波形变得类似于3电平转换器的波形，并且输出电压波形变得类似于5电平转换器的波形。因此，输入电流和输出电压的失真变得比传统的单矩阵转换器小，并且还可以降低引起电磁干扰（EMI）的共模电压。另一方面，所提出的系统需要一个额外的电感，以减少交叉电流之间的并联主电路流动。然而，它表明，交叉电流的峰值可以保持低，通过应用控制，以减少它，如果一个大的电动机被使用和电动机电流增加。
This paper proposes a large-scale matrix converter system which connects two main circuits in parallel and in which the carriers operating each main circuit have a phase difference of 180 degrees. A matrix converter needs an LC filter, not only because it acts as a conventional filter which reduces high frequency ripples caused by the converter switching, but also because the capacitor of the LC filter acts as a virtual voltage source. Therefore, this filter must be connected at the input side. The proposed system can miniaturize the LC filter because the harmonics of the current flowing into the LC filter contain only the even number harmonics of the carrier and the cut-off frequency of the LC filter can be raised. For example, when the cut-off frequency is doubled, the inductor or the capacitor of the LC filter can be reduced to 1/4. The principle of raising the filter current's frequency is verified theoretically using simulation. Furthermore, in the proposed system, the input current waveforms become similar to those of a 3-level converter and the output voltage waveforms become similar to those of a 5-level converter. Therefore, the distortions of the input currents and the output voltages become less than with a conventional single matrix converter, and the common mode voltage, which causes electromagnetic interference (EMI), can also be decreased. On the other hand, the proposed system needs an additional inductance to reduce a cross current that flows between the parallel main circuits. However, it is shown that the peak value of the cross current can be kept low by applying a control to reduce it, if a large motor is used and the motor current increases.