Optimal power balancing method of DC-DC converter in power electronic traction transformer

Abstract

The invention discloses an optimal power balancing method of a DC-DC converter in a power electronic transaction transformer. The method comprises the following steps: establishing a transmission power model and a current stress model under extended phase shift control according to an output parallel dual-active full-bridge DC-DC converter, and deducing internal phase shift amount and external phase shift amount of the dual-active full-bridge DC-DC converter under a current stress optimal control method in combination with a lagrangian multiplier method. Furthermore, for improving the dynamicfeatures of the converter, the actual transmission power of the converter is deduced and resolved by learning from the direct power control thought, and the transmission power loss of the converter iscompensated, thereby obtaining the final optimal phase shift control amount. Through the method disclosed by the invention, the transmission power balancing of various modules can be realized, and the abrupt change of the load resistance and the input voltage of the converter can be quickly responded; the method has the advantages of being fast in dynamic response, high in efficiency, simple in control process, and easy for digital realization, and strong in practicability.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for optimizing power balance of a DC-DC converter in a power electronics traction transformer. Background technique [0002] As an economical, convenient and environmentally friendly public transportation, high-speed railway plays an important role in promoting urban economic development, improving environmental pollution and improving people's living standards. The development of a new generation of high-speed railways tends to be high efficiency, low noise, and light weight, etc. However, power frequency transformers with large volume and mass have become one of the main obstacles to reducing the energy dissipation of trains and increasing the power density of trains. Therefore, power electronic traction transformers with the advantages of energy saving, environmental protection and high power density are regarded as the core equipment of the next generation ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide an optimized power converter for DC-DC converters in power electronic traction transformers that can improve the efficiency and dynamic characteristics of the converter, and at the same time solve the problems of the transmission power balance of each module of the converter. balanced approach

Images