Dq current detection method of single-phase pulse rectifier without phase-locked loop

A technology of pulse rectification and no phase-locked loop, which is applied in the field of converters, can solve problems such as inaccurate dq current detection values, and achieve the effects of simple implementation, elimination of influence, and strong versatility

Inactive Publication Date: 2019-06-21
SOUTHWEST JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, a dq current detection method without a phase-locked loop f

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  • Dq current detection method of single-phase pulse rectifier without phase-locked loop
  • Dq current detection method of single-phase pulse rectifier without phase-locked loop
  • Dq current detection method of single-phase pulse rectifier without phase-locked loop

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[0045] The following describes the specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments, for those of ordinary skill in the art, as long as various changes These changes are obvious within the spirit and scope of the present invention defined and determined by the appended claims, and all inventions and creations using the concept of the present invention are protected.

[0046] Such as figure 1 As shown, a single-phase pulse rectifier dq current detection method without phase locked loop includes the following steps:

[0047] S1, such as figure 2 As shown, the controller generates a reference sine signal and a reference cosine signal, multiplies the reference sine signal and the reference cosine signal with the voltage and current of the power grid respectively, and obtains low-frequency voltage components a...

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Abstract

The invention discloses a dq current detection method of a single-phase pulse rectifier without a phase-locked loop. The influence of SOGI and the phase-locked loop on the dq current observation valuecan be effectively eliminated. The method has high transplantability and is suitable for the single-phase AC/DC or DC/AC device and easy to realize and has high universality.

Description

technical field [0001] The invention relates to the field of converters, in particular to a dq current detection method without a phase-locked loop for a single-phase pulse rectifier. Background technique [0002] In the dq current control of single-phase AC / DC or DC / AC converter, the dq current acquisition method generally adopts the second-order generalized integrator (SOGI) or delays a quarter cycle to obtain the αβ current component, Then use the phase-locked loop to obtain the instantaneous phase of the voltage, and finally use the rotating coordinate transformation to obtain the dq axis current. However, the grid voltage and frequency fluctuate, and SOGI is more sensitive to frequency; and the grid voltage is distorted and unbalanced, and the phase-locked loop is greatly affected by voltage distortion and unbalance, which may lead to loss of lock in severe cases. The above factors may cause the problem that the observed value of dq current is inaccurate with the actua...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 熊成林宋智威黄路杨皓雷海冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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