Three-loop sliding mode variable structure control method for series-in parallel phase-shifted full-bridge converter

Abstract

The invention relates to a three-ring sliding mode variable structure control method for a series-in-parallel phase-shifting full-bridge converter. The three-loop sliding-mode variable structure of the phase-shifted full-bridge converter is more stable and more sensitive to parameters such as input voltage, output voltage and output current in the circuit structure. The three-loop control method coupled with the voltage feedforward link is proposed. At the same time, when the current inner loop adopts sliding mode variable structure control, the dynamic performance and robustness of the three-loop sliding mode variable structure of the series-in parallel phase-shifted full-bridge converter are improved.

Description

technical field [0001] The invention relates to a power electronic converter control system, in particular to a three-loop sliding mode variable structure control method based on a two-module phase-shifting full-bridge serial input and parallel output DC / DC converter. Background technique [0002] The development of social informatization and industrialization benefits from the good use of electric energy. How to use electric energy more efficiently and conveniently has also become one of the research hotspots that people pay attention to. Power electronics technology is a technology that uses power electronic devices to convert and control electrical energy. Power electronic converters refer to circuit systems that convert and control electrical energy. With the research and production of power electronic devices, power electronic converters have also developed rapidly. Electric energy includes DC and AC, so power electronic converters include DC / DC converters, DC / AC conv...

AI Technical Summary

Problems solved by technology

[0006] Disadvantage of prior art 1: when actually designing parameters of the control system, it is necessary to decouple the input voltage equalization loop and output voltage loop in the small signal model of the system before the design of control parameters can be carried out, which has certain complexity

[0008] The disadvantage of the second prior art: the control system is not very different from the traditional double closed-loop control system, and the accuracy of the control can only be guaranteed after reducing the hardware difference between the two modules through the existing technology

In other words, this control method needs to ensure that the parameters such as the transformation ratio of the transformers of the two modules and the leakage inductance of the transformer are almost the same, so as to ensure the steady-state voltage and current sharing accuracy of the system; it is necessary to control the input capacitance of the two modules to be almost the same Only when the system’s dynamic pressure and current balance accuracy can be guaranteed, in fact, when these are guaranteed, there is almost no problem of system voltage and current balance. Therefore, this control method cannot completely solve the problem of serial input and output Averaging of system voltage and current

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