Magnetic integrated mixed type power distribution transformer

Abstract

The invention discloses a magnetic integrated mixed type power distribution transformer. The main circuit comprises a main transformer, a series isolation transformer and a converter unit; an iron core structure consists of iron core columns, iron yokes and magnetic flux leakage iron cores; the main transformer is formed by winding a secondary winding, a primary winding and a control winding on main transformer iron core columns by adopting a layered winding mode; the series isolation transformer is formed by winding a valve side winding and a grid side winding on isolation transformer iron core columns in an overlaid manner by adopting a cake type winding mode; the valve side winding and the control winding both adopt a star-shaped neutral point leading-out connection method, and are connected to the voltage output end and the current output end of the converter unit respectively; the magnetic flux leakage iron core is placed between the primary winding and the control winding, and between the valve side winding and the grid side winding separately, so that the magnetic integration design for connecting the output of the transformer and the converter with an inductor is realized;the main transformer and the series isolation transformer share one middle iron yoke, so that weak coupled integration between the main transformer and the series isolation transformer is realized; and each winding adopts a phase shifting arrangement mode, so that utilization rate of a ferromagnetic material is improved effectively.

Description

technical field [0001] The invention relates to a magnetically integrated hybrid distribution transformer, which belongs to the technical field of transformers. Background technique [0002] In recent years, the process of intelligent upgrading and transformation of distribution network has been accelerating. Although traditional distribution transformers have simple structure, reliable operation and good economy, their controllability is poor and they cannot adapt to the future development trend of distribution network. Therefore, Research on new controllable distribution transformers has gradually become a current research hotspot. In this context, the scientific and technological workers of ABB Research Institute, University of Zielona Góra, and Instituto Superior Técnico proposed the concept of hybrid distribution transformers. The so-called hybrid distribution transformer is a new type of controllable distribution transformer realized by improving the design of the tra...

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Problems solved by technology

Although related reports claim that the integrated design of the magnetic integration of discrete magnetic parts in the system can be realized without changing the control performance of the hybrid distribution transformer, the structure of the iron core and the arrangement of the windings are very complicated, and the leakage inductance can be realized through reverse series connection. When replacing the output connection inductor, the number of winding turns is too many, and the volume of the coil is large, which affects its practicability

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