The three-phase isolated ac–dc matrix converter (3P-IMC) inherits all the merits of the conventional matrix converter. But it also suffers from a large number of bidirectional switches and cannot operate safely in an open-circuit fault condition. Hence, with a general space vector PWM (SVPWM) model presented in this article, three types of asymmetrical SVPWM (ASVPWM) schemes are first proposed for normal and open-circuit fault-tolerant operation. The ASVPWM schemes have more kinds of synthetic vectors with asymmetrical distribution, however, also feature a higher freedom and flexibility to further improve the system performance. Then by sectional combining the above ASVPWM schemes with the conventional one, the 3P-IMC could be continued to operate with a tight dc output voltage regulation under single-switch open-circuit fault condition, which has an inherent open-circuit fault-tolerant capability. Compared with the conventional two-phase fault-tolerant operation, the proposed strategy has a smaller output voltage ripple, lower current stress, lower current harmonic, higher maximum output power, etc. The safety and reliability of the converter are greatly improved. Finally, a 3P-IMC experimental prototype is built up to verify the performance of the proposed ASVPWM schemes.

中文翻译：

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具有正常和开路容错操作能力的一系列非对称 SVPWM 方案，适用于三相隔离 AC-DC 矩阵转换器


三相隔离交直流矩阵变换器（3P-IMC）继承了传统矩阵变换器的所有优点。但它也存在大量双向开关的问题，无法在开路故障情况下安全运行。因此，通过本文提出的通用空间矢量 PWM (SVPWM) 模型，首先提出了三种类型的非对称 SVPWM (ASVPWM) 方案，用于正常和开路容错操作。 ASVPWM方案具有更多种类的非对称分布的合成矢量，但也具有更高的自由度和灵活性，可以进一步提高系统性能。然后通过将上述ASVPWM方案与传统方案进行分段组合，3P-IMC可以在单开关开路故障条件下继续以严格的直流输出电压调节运行，具有固有的开路容错能力。与传统的两相容错运行相比，该策略具有更小的输出电压纹波、更低的电流应力、更低的电流谐波、更高的最大输出功率等，大大提高了变换器的安全性和可靠性。最后，建立了一个3P-IMC实验原型来验证所提出的ASVPWM方案的性能。