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

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...

AI Technical Summary

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 for a single-phase pulse rectifier provided by the present invention solves the problem of inaccurate dq current detection values

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