Voltage feedforward-based direct current voltage boosting converter control method

Abstract

The invention provides a voltage feedforward-based direct current voltage boosting converter control method. The control method comprises the following steps of detecting the input voltage, output voltage, input current and output current of the direct current voltage boosting converter; calculating the voltage feedforward duty ratio and calculating the current duty ratio by using a PI closed-loopalgorithm; judging whether the voltage feedforward duty ratio is less than a set maximum voltage duty ratio or not; if so, calculating the final duty ratio according to the current duty ratio and thevoltage feedforward duty ratio; and if not, calculating the final duty ratio according to the current duty ratio and the maximum voltage duty ratio, and controlling a power tube switch of the directcurrent voltage boosting converter based on the final duty ratio. The method has the advantages as follows: on the basis of the conventional current PI closed loop control direct current voltage boosting converter, voltage feedforward control is added, so that interference of fuel cell output voltage high fluctuation to the current PI closed loop control is suppressed, and the reaction speed of the direct current voltage boosting converter is increased.

Description

technical field [0001] The invention relates to a control method, in particular to a voltage feed-forward-based DC boost converter control method. Background technique [0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy generated by the reaction of hydrogen and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high power generation efficiency and low environmental pollution, so it is widely used in the automotive field. However, the output voltage of the hydrogen fuel cell is relatively low, and the voltage needs to be increased by a DC boost converter to meet the demand for powering the vehicle. The DC boost converter should ensure the stable output of the hydrogen fuel cell to ensure the smooth operation of the vehicle. The existing DC boost converters all use the current closed-loop feedback control method to ensure the stable and smooth output of the hydrogen fuel cell current. ...

AI Technical Summary

Problems solved by technology

[0003] While the vehicle is running, many external factors, such as road conditions, vehicle braking, etc., will have a greater impact on the voltage on the power battery bus, which in turn will cause fluctuations in the input current of the DC boost converter.

If the performance of the power battery is seriously attenuated, the maximum fluctuation range of its output voltage can reach more than 100V, and the current closed-loop feedback control of the traditional current PI regulation used in the current DC boost converter is in the face of a large power battery voltage fluctuation range. , cannot respond to changes in output voltage in time, resulting in the hydrogen fuel cell being unable to provide a stable output current

Images