A current sharing method, device and equipment for output parallel buck/boost converter

Abstract

The present invention provides a current equalization method, device and equipment for outputting parallel Buck / Boost converters, comprising: step 1, collecting DC input voltages, two inductor currents and DC output voltages of two parallel Buck / Boost converters; Step 2, taking the deviation of the two input voltages, the difference of the inductance value and the change of the load into the system model, and designing the second-order sliding mode control method of the super twist algorithm for the collected two inductor currents and the DC output voltage, The sliding mode surface including the output voltage error and the inductor current error is constructed, and the voltage is designed as an outer ring, and the current is designed as an inner ring. The current sharing method, device and equipment of the output parallel Buck / Boost converter provided by the present invention do not require additional hardware auxiliary circuits, which saves cost and reduces complexity; meanwhile, it also facilitates the design of the parallel current sharing link algorithm, and the method It is simple and practical, and effectively enhances the dynamic steady-state performance and current sharing effect of the output parallel Buck / Boost converter under the disturbance condition.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a current sharing method, device and equipment for an output parallel Buck / Boost converter. Background technique [0002] With the rapid development of distributed power generation systems, bidirectional DC-DC converters play an increasingly important role in the energy management of electric vehicles and energy storage. The characteristics put forward higher requirements. During the charging and discharging process of the system, stable voltage and current output characteristics need to be guaranteed. Superior dynamic and steady-state performance is an important condition for the safe and reliable operation of the system. At the same time, in order to increase the system capacity, the interleaved parallel scheme of bidirectional DC-DC converters has also been widely used. The interleaved parallel scheme can effectively reduce the stress on the switching devices, reduc...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an output parallel Buck / Boost converter current sharing method, device and equipment, the purpose of which is to solve the output parallel Buck / Boost converter current sharing problem and the problem of being easily affected by disturbances

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