Zero sequence ring current suppression method for direct current bus-shared open-end winding asynchronous motor system

An asynchronous motor and zero-sequence circulating current technology, applied in the field of zero-sequence circulating current suppression of common DC bus open-winding asynchronous motor systems and inverter control, can solve the problem of large common-mode voltage, without considering the zero-sequence voltage component of the inverter, Issues such as zero-sequence voltage are not considered

Active Publication Date: 2017-09-22
HEFEI UNIV OF TECH
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Problems solved by technology

[0011] (1) Schemes 1), 2), and 3) do not take into account the zero-sequence voltage component caused by the nonlinearity of the inverter;
[0012] (2) Schemes 1), 2), and 3) do not take into account the zero-sequence voltage generated by the zero-sequence component in the back electromotive force of the open-winding asy

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  • Zero sequence ring current suppression method for direct current bus-shared open-end winding asynchronous motor system
  • Zero sequence ring current suppression method for direct current bus-shared open-end winding asynchronous motor system
  • Zero sequence ring current suppression method for direct current bus-shared open-end winding asynchronous motor system

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[0081] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of this patent.

[0082] The present invention proposes a space vector PWM modulation scheme with controllable zero-sequence voltage. By actively controlling the zero-sequence voltage of the common DC bus open-winding asynchronous motor system, the suppression of zero-sequence circulating current is realized, and at the same time avoiding the use of zero-sequence vectors, reducing The common-mode voltage of an open-winding motor system.

[0083] figure 1 It is the topology structure of the common direct current bus open-winding asynchronous motor involved in the invention. ...

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Abstract

The invention aims to solve the technical problems of obvious stator current distortion and zero-sequence ring current of the direct current bus-shared open-end winding asynchronous motor caused by pure suppression of the zero sequence ring current in a modulation strategy link and neglecting of non-linearity and counter electromotive force zero sequence component in the prior art; on the basis, the invention provides a space vector PWM modulation scheme with controllable zero sequence voltage; by performing active control on the zero sequence voltage of the direct current bus-shared open-end winding asynchronous motor system, suppression of the zero sequence ring current is realized; and meanwhile, use of a zero vector is avoided, so that the common-mode voltage of the open-end winding asynchronous motor system is lowered.

Description

technical field [0001] The invention belongs to the inverter control technology in the field of electrical engineering, and in particular relates to a method for suppressing zero-sequence circulating current in a common DC bus open-winding asynchronous motor system. Background technique [0002] Compared with the traditional single-inverter driven asynchronous motor speed control system, the common DC bus open-winding asynchronous motor system has the advantages of high fault tolerance, flexible topology, and low DC side voltage level. Based on this, the common DC bus open-winding asynchronous motor system has attracted more and more attention from the academic circle. [0003] Although the common DC bus open-winding asynchronous motor has a good application prospect, as a relatively new motor topology, it still faces many problems to be solved, one of which is the zero-sequence circulating current problem of the system. The zero-sequence circulating current of the system i...

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Application Information

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IPC IPC(8): H02M7/493H02M1/12H02P21/00H02P27/08
CPCH02M1/12H02M7/493H02P21/0003H02P27/085H02M1/123
Inventor 杨淑英姚乐张兴李浩源谢震
Owner HEFEI UNIV OF TECH
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