Z-source two-stage matrix converter with fault-tolerant topology and its control method

Abstract

The invention discloses a Z-source two-stage matrix converter with a fault-tolerant topological structure and a control method thereof, belonging to the technical field of matrix converter control. The two ends of the three-phase bridge arm of the rectification stage of the Z-source two-stage matrix converter are connected in parallel to replace the fourth bridge arm of the open bidirectional switch; for the open circuit failure of the bidirectional switch tube of the rectification stage, the space vector sector of the rectification stage is re-divided so that each The sector contains a unique non-zero vector to adjust the fault-tolerant control strategy of the rectifier stage. When the expected vector of the rectifier stage is located in the faulty sector, the duty cycle of the through vector of the faulty sector is adjusted to adjust the fault-tolerant control strategy of the inverter stage. Aiming at the open circuit failure of a certain bidirectional switching tube of the rectification stage, the invention utilizes the fourth bridge arm and the fault-tolerant control strategy to realize the fault-tolerant operation of the Z-source two-stage matrix converter, thereby improving the reliability and safety of the matrix converter.

Description

technical field [0001] The invention discloses a Z-source two-stage matrix converter with a fault-tolerant topological structure and a control method thereof, belonging to the technical field of matrix converter control. Background technique [0002] The AC power converter is the core of the AC frequency conversion system and the most important part of many electrical equipment. With the advancement of power electronics technology and the emergence of high-performance semiconductor power devices, AC power converters have also developed rapidly. Among them, the matrix converter, as a new type of AC converter, has the advantages of compact structure, small volume, good stability and long service life. The dual-stage matrix converter evolved from the matrix converter not only has the advantages of the traditional matrix converter, but also overcomes the disadvantages of the traditional matrix converter, such as complex commutation and the need for clamping circuits. [0003] ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a Z-source two-stage matrix converter with a fault-tolerant topology and its control method, and propose a two-stage matrix converter with a fault-tolerant topology for the rectification stage. The converter and the fault-tolerant control method for the failure of the rectification stage of the two-stage matrix converter solve the technical problem that the converter cannot continue to operate after the failure of a bidirectional switch tube in the rectification stage of the two-stage matrix converter.

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