Research on Three-Phase Voltage Phase-Locked Loop Technology Based on QPR Control
Aiming at the problem that the traditional dual generalized integrator phase-locked loop(DSOGI-PLL)cannot achieve fast phase locking and frequency locking when the grid voltage state changes,a three-phase voltage phase-locked loop method based on quasi-proportional resonance(QPR)controller is proposed in this paper.That is,before the grid voltage enters the PLL section,the QPR method is used to process the grid voltage and filter out the harmonic components.The simulation results of voltage amplitude change,phase change and frequency change show that the proposed method has the advantages of fast phase locking and frequency locking compared with the traditional DSOGI-PLL method.
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