Single phase angle tracking method for power switches gating synchronization

摘要

This paper proposes a novel method for generating the pulses needed to fire power electronic switches that can be used for single-phase power converters. Simple operations based on the three-phase arctangent method are used within a digital signal controller or microcontroller to generate a sawtooth carrier signal phi, with an amplitude of 2pi and concurrent to the period of time of the sinusoidal input. With this signal and using standard Pulse Width Modulation techniques, gating is obtained directly. Two orthogonal signals are the basis of the arctangent method of synchronization; these signals are obtained by numerical differentiation, and normalized using frequency of the same amplitude. This strategy shortens the time consumed. The synchronizing method proposed is validated through MATLAB simulations, and used with several single-phase grid variations, such as sag, swell, flicker, frequency or phase jump. Infinite impulse response (IIR) Butterworth filter is added to take into consideration harmonic contamination on the grid. Experimental results of gating signals are presented to show the proposal's feasibility.