Interleaved parallel dc-dc converter switching control method, controller and system

Abstract

The present disclosure provides a switching control method, controller and system for an interleaved parallel DC-DC converter. Among them, the switching control method of the interleaved parallel DC-DC converter includes: according to all the working states of the interleaved parallel DC-DC converter and Kirchhoff's law, the discrete-time model of the interleaved parallel DC-DC converter, namely the switching model , and then calculate the predicted values ​​of all phase inductor currents of the interleaved parallel DC-DC converter at the next moment; according to the switching model of the interleaved parallel DC-DC converter and the outer loop voltage control, predict the reference value of the inductor current at the next moment; With the goal of balancing the inductance currents of all phases of the interleaved parallel DC-DC converter, the predicted values ​​of the inductance currents of all phases at the next moment are compared with the reference values ​​of the inductance currents at the next moment to obtain all switch state combinations at the next moment; The switching state combination closest to the corresponding inductor current reference value is selected and applied to the next switching moment to obtain the optimal switching rate to control the operation of the interleaved parallel DC-DC converter.

Description

technical field [0001] The disclosure belongs to the field of power electronic control, and in particular relates to a switching control method, controller and system of interleaved parallel DC-DC converters. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] DC-DC converters are suitable for high-voltage conversion applications, such as photovoltaic power generation systems, uninterruptible power supplies, and distributed power generation. At present, DC-DC converters include two-level converters and three-level converters. The interleaved parallel technology reduces the current of the switching tubes to half, reducing the output voltage and current ripple. Although the structure of the current two-level bidirectional DC-DC converter is simple, the filter volume is large and the voltage stress of the switching tube is large. The circuit t...

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Problems solved by technology

The PI control method has the advantages of simple algorithm and good control effect, but the parameter design and selection process of the PI controller is cumbersome, and the small signal model based on the state space averaging method is approximated by ignoring the high-order items in the model. The inventors found that , these methods are only effective near the operating point. In the face of large signal disturbances such as input voltage mutations and load mutations, the system may be unstable, and large signal analysis of the system is required

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