A Phase Locking Method Based on Instantaneous Virtual Reactive Power Detection
A power detection and phase-locking technology, applied in the field of phase-locked loops, can solve problems such as complex control structure and elimination of third-harmonic interference in three-phase power grids, so as to simplify the control structure, eliminate third-harmonic interference, and improve phase-locking accuracy Effect
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[0045] see Figure 5 , Figure 5 (a) is a three-phase grid voltage fundamental wave frequency simulation diagram, Figure 5 (b) The simulation diagram of the voltage waveform with the third harmonic added, in which the third harmonic with an amplitude of 1 is added to the three-phase grid voltage, and the fundamental frequency of the three-phase grid voltage changes from 50Hz to 45Hz in 0.03 seconds. see Figure 6 , Figure 6 (a) is the simulation diagram of the phase-locked loop output frequency, Figure 6 (b) The output voltage waveform simulation result diagram, wherein the output voltage of the phase-locked loop does not contain the third harmonic component of the power grid, which verifies that the present invention has the advantage of eliminating the third harmonic of the power grid. Because the PLL phase-locking speed of the present invention is very fast, cannot from Figure 6 The process and time of phase-locking are observed. Therefore, see Figure 7 , the wa...
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