Predictive current phase-shifting control method for three-port converter half-switching period sampling

Abstract

The invention discloses a predictive current phase-shifting control method for three-port converter half-switching period sampling. The method comprises the steps of: based on a Y-delta equivalent transformation and current ripple method, calculating the inductor current slope of a converter under different operating conditions; collecting the inductor currents at the zero point time and the midpoint time of each switching cycle, obtaining the inductor current reference value according to the PI controller, and calculating and generating the predicted shift ratio in half of the switching cycle based on the inductor current sampling value and the inductor current reference value, and updating the shift comparison after half of the switching cycle. The invention discloses the predictive current phase-shifting control method suitable for three-port converter half-switching period sampling, which can update the phase shifting ratio in real time according to the reference value of the inductor current and can effectively eliminate the direct current component in the inductor current.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and more specifically relates to a predictive current phase-shift control method for half-switching period sampling of a three-port converter. Background technique [0002] The three-port converter adopts a full-bridge topology, which has the advantages of high power density, bidirectional energy flow, and symmetrical three-port structure. It is widely used in distributed power generation systems, microgrid energy storage systems, and other occasions. [0003] The asymmetry of the switch tube drive signal parameters of the three-port converter or the inconsistency of the switch tube parameters cause the switch to be turned on and off at different times in one switching cycle of the converter. A direct current component leads to an inrush current in the switching tube, and the excessive current stress of the switching tube will affect the safe and stable operation of the converter...

AI Technical Summary

Problems solved by technology

[0003] The asymmetry of the switch tube drive signal parameters of the three-port converter or the inconsistency of the switch tube parameters cause the switch to be turned on and off at different times in one switching cycle of the converter. A direct current component leads to an inrush current in the switching tube, and the excessive current stress of the switching tube will affect the safe and stable operation of the converter. In the traditional double closed-loop control method, the inner loop of the controller uses a PI controller to generate a phase shift, which cannot be effectively Eliminates the DC component in the inductor current

[0004] In the existing predictive current phase-shift control technology, the sampling time of the inductor current is at the operating time of the switching tube, and the high-frequency current generated at the operating time of the switching tube will interfere with the sampling process, resulting in errors in the sampled inductor current

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