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New protection issues of a matrix converter: design considerations for adjustable-speed drives

机译:矩阵转换器的新保护问题:可调速驱动器的设计注意事项

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摘要

Induction motors are traditionally controlled by standard pulsewidth modulation voltage-source inverters. An alternative is the matrix converter, which consists of nine bidirectional switches. This converter has benefits compared to a standard inverter, like sinusoidal input current and bidirectional power flow. The main disadvantage is the lack of a bidirectional switch, because such a switch may be done by two transistors and two diodes. An important topic is protection of the matrix converter, and this paper proposes two new protection circuits for matrix converters with a reduced number of components. The number of protection diodes is reduced by six. Design expressions of the protection circuit are calculated and validated by simulation. The standard protection circuit and the new circuits are demonstrated by simulation to have the same performance. Experimental results on an 8 kVA matrix converter show the design expressions are correct. It is concluded that it is possible to reduce the necessary power components in a matrix converter.
机译:传统上,感应电动机由标准脉宽调制电压源逆变器控制。另一种选择是矩阵转换器,它由九个双向开关组成。与标准逆变器相比,该转换器具有优势,例如正弦输入电流和双向功率流。主要缺点是缺少双向开关,因为这种开关可以由两个晶体管和两个二极管完成。一个重要的话题是矩阵转换器的保护,本文提出了两个新的用于矩阵转换器的保护电路,其元件数量减少了。保护二极管的数量减少了六个。通过仿真计算并验证了保护电路的设计表达式。通过仿真演示了标准保护电路和新电路具有相同的性能。在8 kVA矩阵转换器上的实验结果表明设计表达式是正确的。结论是可以减少矩阵转换器中必要的功率分量。

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