DC bus voltage soft start method of dual-active full-bridge bidirectional DC/DC converter

Abstract

The invention discloses a DC bus voltage soft start method of a dual-active full-bridge bidirectional DC / DC converter. According to the method, an optimal internal phase shift angle alpha p_opti = (1-m) pi between the upper bridge arm driving signals of a first upper and lower complementary bridge arm and a second upper and lower complementary bridge arm is calculated, wherein m = battery voltageVbatt*transformer transformation ratio / DC bus voltage Vbus; an internal phase shift angle alpha p' of a DC / DC converter is acquired; a register dead time is converted into the phase angle alpha p1_DZof the first upper bridge arm driving signal and the phase angle alpha p3_DZ of the second upper bridge arm driving signal; according to the optimal internal phase shift angle alpha p_opti, the internal phase shift angle alpha p' and the phase angles alpha p1_DZ and alpha p3_DZ, the adjustment degrees of freedom alpha p1 and alpha p3 corresponding to the first upper bridge arm driving signal and the second upper bridge arm driving signal are respectively obtained; and according to the alpha p1 and the alpha p3, the driving signals of four switches on the low-voltage side of the DC / DC converterare given. According to the invention, the problem of overlarge starting current in the DC bus voltage soft start process of the dual-active full-bridge bidirectional DC / DC converter is solved whilethe DC bus voltage soft start is effectively realized.

Description

technical field [0001] The invention relates to a method for soft-starting DC bus voltage of a double-active full-bridge bidirectional DC / DC converter. Background technique [0002] Energy is the foundation of national economic development and human daily life. At present, the main energy sources are many non-renewable energy sources such as coal, oil and natural gas. With the rapid development of society and rapid economic growth, the demand and consumption of energy are increasing worldwide. However, the reserves of non-renewable energy are limited, and with energy consumption, the energy crisis is becoming more and more serious. At the same time, the development and use of non-renewable energy has caused serious pollution to the environment, the emission of greenhouse gases such as carbon dioxide has led to global warming, and the sulfide of non-renewable energy has also seriously affected the survival and development of human beings. [0003] In order to alleviate the...

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Problems solved by technology

[0008] In view of the above-mentioned technical problems, the object of the present invention is to provide a method for soft-starting the DC bus voltage of a dual active full-bridge bidirectional DC / DC converter. Solve the problem of excessive starting current during the starting process, and at the same time effectively realize the soft start of the DC bus voltage

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