Multi-target parameter optimization design method based on dual-active full-bridge three-phase bidirectional AC/DC converter

Abstract

The invention discloses a multi-target parameter optimization design method based on a dual-active full-bridge three-phase bidirectional AC / DC converter, and the method comprises the steps: selecting an energy transmission inductance value, a high-frequency transformer turn ratio and a phase shift ratio as three optimized parameters, and determining the three parameters as optimization objects; selecting a ratio of reactive power to active power of the high-frequency transformer, an energy transmission inductive current effective value and a current peak-to-peak value as optimization targets, and calculating to obtain expressions of the optimization targets and the optimization objects; determining constraint conditions among the energy transmission inductance value, the turn ratio of the high-frequency transformer and the phase shift ratio; the expressions of all the optimization targets are synthesized into a single-target optimization function according to the weight coefficients; a genetic algorithm and chaos search combined method is adopted to carry out iterative optimization to obtain a plurality of groups of optimal solutions, loss analysis is carried out according to an actual hardware circuit, and values of an energy transmission inductance value, a high-frequency transformer turn ratio and a phase shift ratio when the circuit loss is minimum are selected. The method is simple in optimization algorithm and good in optimization effect.

Description

technical field [0001] The invention relates to a three-phase bidirectional AC / DC converter technology, in particular to a multi-objective parameter optimization design method based on a dual active full-bridge three-phase bidirectional AC / DC converter. Background technique [0002] In recent years, the number of renewable energy systems used to solve environmental problems has been increasing, and the power generation of renewable energy systems such as solar power generation and wind power generation fluctuates greatly, which often causes grid instability. To avoid this effect, battery energy storage systems are used to regulate power and compensate for grid fluctuations. The connection between the battery energy storage system and the power grid requires a bidirectional AC / DC converter, which needs to achieve its high efficiency and high power density while ensuring power quality. The dual-active full-bridge three-phase bidirectional AC / DC converter uses a high-frequency...

AI Technical Summary

Problems solved by technology

[0003] Most scholars have conducted research on the circuit structure and control strategy of the dual-active full-bridge three-phase bidirectional AC / DC converter. Although they have achieved certain results, they often do not take into account the main circuit parameters and Interactions between control parameters, which affect each other

If only a single performance index in the circuit is optimized and analyzed, to a certain extent, the designed parameters will be locally optimal, and the stability of the entire system cannot be guaranteed.

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