Multi-objective optimization control method for full power range of dual-active bridge converter

Abstract

The invention discloses a multi-objective optimization control method for a dual-active full-bridge DC-DC converter based on triple phase shift control. The multi-objective optimization control method is characterized in that: voltage and current information of the converter is collected, inductive current stress serves as an optimization target, under the constraint condition of zero-voltage switching-on of a switching tube, an equation is built through a KKT condition method, the optimal phase-shifting angle control quantity with a simple expression form is obtained, and efficiency optimization of the converter within the range from low power to high power is achieved; and meanwhile, a virtual voltage component is introduced to compensate for an error generated between actual transmission power and output power due to power loss of the converter, and online estimation is performed on the transmission power of the converter according to the virtual voltage component and acquired voltage and current information, so that the dynamic performance of the converter is improved. Compared with a traditional single-phase-shift control method, the multi-objective optimization control method has the advantages that the efficiency of the converter is improved within the full-power range, the dynamic performance is obviously improved, and the control method is suitable for the working environment with complex working conditions and variable loads.

Description

Technical field [0001] The present invention relates to the field of DC transform in electrical engineering, and more particularly to a multi-objective optimization control method of efficiency and dynamic performance based on a dual-transparent bridge converter in a single power range under soft switch conditions. Background technique [0002] With the continuous development of new energy technologies, the two-way DC converters are earnestly valued, and are widely used in distributed power generation systems, DC distribution networks and electric vehicles. Among them, the DUAL Active Bridge, DAB DC-DC converter has received the attention and research of many scientific research workers due to the advantages of simple control, electrical isolation, high power density. [0003] The traditional single-phase control method is the most common control method of the DAB converter, which has the characteristics of simple control, easy implementation, but the method is in the low power s...

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Problems solved by technology

[0003] The traditional single-phase-shift control method is the most commonly used control method for DAB converters. It has the characteristics of simple control and easy implementation. However, this method has the phenomenon of excessive current stress and return power in the low-power section of the converter, especially in the The problem is especially severe in the case of mismatched input and output voltages, resulting in inefficient converters

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