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Phase-locked loop for microprocessor with reduced complexity voltage controlled oscillator suitable for inverters

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2 Author(s)
Baker, D.M. ; Centre of Renewable Energy Syst. Technol. Australia (CRESTA), Curtin Univ. of Technol., Perth, WA, Australia ; Agelidis, V.G.

For grid-connected inverter applications it is necessary to produce a sinewave that is synchronised with the grid to act as a reference to produce an output waveform. The reference waveform is normally required for generating pulse width modulation (PWM) information or as a comparison waveform for the inverter controller. The phase-locked loop in this paper produces a sinusoidal output that matches phase and frequency using the zero crossing information only. This allows simplified phase detection methods to be used. The new all-digital phase-locked loop is based on a novel iterative technique to calculate the sine and cosine waveforms. This technique uses less computation to generate similar quality results to traditional multiterm Taylor series expansion techniques. A full derivation of the iterative algorithm is provided for examination. Graphs are presented that illustrate the errors of the voltage controlled oscillator and simulation results are presented for a phase-locked loop that attempts to reduce phase jitter and phase offset.

Published in:

Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings. 1998 International Conference on  (Volume:1 )

Date of Conference:

1-3 Dec. 1998